"use strict";

// Guildhall client: renders the server's state and animates progress bars
// between polls. The server is the source of truth for everything.

const POLL_MS = 10000;
const SUMMARY_MODAL_AT = 25;

let C = null;            // static content tables
let S = null;            // latest state
let skew = 0;            // server clock minus client clock, seconds
let page = decodeURIComponent(location.hash.slice(1)) || remember("page") || "town";
let selected = null;     // bank item
let dollPick = null;     // equipment slot shown on the character sheet
let pickedClass = null;  // registration
const tabs = {};         // skill -> selected recipe tab
let refreshing = false;
let refreshedFor = null; // action (start and length) a completion refresh was sent for
let retriedAt = 0;        // last time a fight past its kill asked again for the next one
let version = null;      // server build this page was loaded from
let failures = 0;        // polls in a row that didn't reach the server
let warned = null;       // threat the "at the gates" alarm was raised for
let watching = null;     // raid report open in the modal

const $ = (sel, root = document) => root.querySelector(sel);

// Icons are game-icons.net glyphs (CC BY 3.0) from one sprite, tinted per tier or material.
const glyph = (name, tint) => `<svg class="gi" style="color:${tint}" aria-hidden="true"><use href="/static/icons.svg#${name}"></use></svg>`;
const COIN = glyph("two-coins", "#e0b04a"), FAVOUR = glyph("sparkles", "#b98ce8"), HEART = glyph("hearts", "#e2645c");

function iconise(content) {
  const entries = [...Object.values(content.items), ...content.skills, ...Object.values(content.classes),
    ...Object.values(content.buildings), ...content.prayers, ...content.actions];
  for (const entry of entries) if (entry.glyph) entry.icon = glyph(entry.glyph, entry.tint);
  return content;
}
const esc = (s) => String(s ?? "").replace(/[&<>"']/g, (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" })[c]);
const fmt = (n) => Math.floor(n).toLocaleString("en-GB");
const serverNow = () => Date.now() / 1000 + skew;
const item = (id) => C.items[id] || { name: id, icon: "❔", value: 0 };
const skillOf = (id) => C.skills.find((s) => s.id === id);
const playerName = (uid) => S.players.find((p) => p.id === uid)?.name || uid;

function remember(key, value) {
  try {
    if (value === undefined) return localStorage.getItem("gh." + key);
    localStorage.setItem("gh." + key, value);
  } catch { /* private mode: fine */ }
  return null;
}

// --- server ---------------------------------------------------------------

async function api(path, body) {
  const options = body === undefined ? {} : {
    method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify(body),
  };
  const res = await fetch(path, options);
  const data = await res.json().catch(() => ({ error: "The server didn't answer properly" }));
  if (!res.ok) throw new Error(data.error || res.statusText);
  return data;
}

async function act(path, body) {
  try {
    accept(await api(path, body));
  } catch (err) {
    toast(err.message, "bad");
  }
}

async function refresh() {
  if (refreshing) return;
  refreshing = true;
  try {
    accept(await api("/api/state"));
    failures = 0;
  } catch (err) {
    // A deploy restarts the server for a second or two; only speak up if
    // the city stays out of reach.
    if (++failures === 3) toast("Lost contact with the city. Retrying…", "bad");
  } finally {
    refreshing = false;
  }
}

function accept(state) {
  version ??= state.version;
  if (state.version !== version && !document.querySelector("[data-keep]:focus") && $("#modal").hidden) {
    location.reload();  // a new build was deployed
    return;
  }
  S = state;
  skew = state.now - Date.now() / 1000;
  if (state.summary) showSummary(state.summary);
  const ev = state.upcoming;
  if (ev?.at_gates && warned !== ev.id) {
    warned = ev.id;
    toast(ev.kind === "dragon" ? "🐉 The dragon is overhead!" : "⚔️ Raiders at the gates!", "bad");
  }
  render();
  showThreat();
}

// --- time -----------------------------------------------------------------

function dur(seconds) {
  if (seconds > 0 && seconds < 10) return `${+seconds.toFixed(1)}s`;
  seconds = Math.max(0, Math.round(seconds));
  const d = Math.floor(seconds / 86400), h = Math.floor(seconds % 86400 / 3600);
  const m = Math.floor(seconds % 3600 / 60), s = seconds % 60;
  if (d) return `${d}d ${h}h`;
  if (h) return `${h}h ${m}m`;
  if (m) return `${m}m ${s}s`;
  return `${s}s`;
}

function clock(t) {
  return new Date((t - skew) * 1000).toLocaleString("en-GB", { weekday: "short", hour: "2-digit", minute: "2-digit" });
}

// Coarse on purpose: the markup stays the same between polls (see setHtml).
function ago(t) {
  const s = serverNow() - t;
  if (s < 60) return "just now";
  if (s < 3600) return `${Math.floor(s / 60)}m ago`;
  if (s < 86400) return `${Math.floor(s / 3600)}h ago`;
  return `${Math.floor(s / 86400)}d ago`;
}

// A live "3h 12m" until `t`, filled in and kept current by animate().
const countdown = (t) => `<span data-countdown="${t}"></span>`;

// --- toasts & summaries ---------------------------------------------------

function toast(text, kind = "") {
  const el = document.createElement("div");
  el.className = "toast " + kind;
  el.textContent = text;
  $("#toasts").append(el);
  setTimeout(() => el.remove(), kind === "level" ? 6000 : 3500);
  const keep = matchMedia("(max-width: 900px)").matches ? 2 : 4;
  while ($("#toasts").children.length > keep) $("#toasts").firstChild.remove();
}

function showSummary(sum) {
  if (!sum.done && !sum.stopped) return;
  if (sum.done >= SUMMARY_MODAL_AT) return awayModal(sum);
  const got = Object.entries(sum.items).map(([id, q]) => `+${fmt(q)} ${item(id).name}`);
  if (sum.gold) got.push(`+${fmt(sum.gold)} gold`);
  if (got.length) toast(got.join("  ·  "), "good");
  const eaten = Object.entries(sum.eaten || {});
  if (eaten.length) toast(`Ate ${eaten.map(([id, q]) => `${fmt(q)} ${item(id).name.toLowerCase()}`).join(", ")}`);
  if (sum.lucky) toast(sum.lucky === 1 ? "✨ Double yield!" : `✨ ${sum.lucky} double yields!`, "level");
  const spilled = Object.entries(sum.overflow);
  if (spilled.length) toast(`📦 Bank full: ${spilled.map(([id, q]) => `${fmt(q)} ${item(id).name.toLowerCase()}`).join(", ")} went to the city`);
  const sold = Object.entries(sum.sold || {});
  if (sold.length) toast(`📦 Bank full: sold ${sold.map(([id, q]) => `${fmt(q)} ${item(id).name.toLowerCase()}`).join(", ")} for ${fmt(sum.sold_gold)} gold`);
  for (const [skill, level] of sum.levels) toast(`🎉 ${skillOf(skill).name} level ${level}!`, "level");
  if (sum.stopped) toast(`Stopped: ${sum.stopped}`, "bad");
  for (const id of sum.potion_out || []) toast(`🧪 Your ${item(id).name.toLowerCase()} ran out`, "bad");
  for (const id of Object.keys(sum.potions_drunk || {})) toast(`🧪 Drank another ${item(id).name.toLowerCase()}`);
  if (sum.prayer_out) toast("🙏 Out of prayer points", "bad");
  if (sum.second_wind) toast("🌬️ Second Wind! Back to half HP", "level");
  if (sum.resumed) toast(`Back to ${C.actions.find((x) => x.id === sum.resumed).name.toLowerCase()}`);
}

function awayModal(sum) {
  const items = Object.entries(sum.items).map(([id, q]) => `<li>${item(id).icon} ${fmt(q)} ${esc(item(id).name)}</li>`).join("");
  const xp = Object.entries(sum.xp).map(([id, q]) => `<li>${skillOf(id).icon} ${fmt(q)} ${esc(skillOf(id).name)} XP</li>`).join("");
  const levels = sum.levels.map(([id, l]) => `<li>🎉 ${esc(skillOf(id).name)} reached level ${l}</li>`).join("");
  const spilled = Object.entries(sum.overflow).map(([id, q]) => `<li>${item(id).icon} ${fmt(q)} ${esc(item(id).name)}</li>`).join("");
  const sold = Object.entries(sum.sold || {}).map(([id, q]) => `<li>${item(id).icon} ${fmt(q)} ${esc(item(id).name)}</li>`).join("");
  openModal(`
    <h2>While you were away</h2>
    <p class="muted">You completed ${fmt(sum.done)} actions${sum.wins || sum.losses ? ` (${sum.wins} fights won, ${sum.losses} lost)` : ""}.</p>
    ${Object.keys(sum.eaten || {}).length ? `<p class="muted small">Took ${fmt(sum.damage)} damage and ate ${Object.entries(sum.eaten).map(([id, q]) => `${fmt(q)} ${esc(item(id).name.toLowerCase())}`).join(", ")}.</p>` : ""}
    ${items ? `<ul>${items}</ul>` : ""}
    ${sum.gold ? `<p class="gold">+${fmt(sum.gold)} gold</p>` : ""}
    ${xp ? `<ul>${xp}</ul>` : ""}
    ${levels ? `<ul>${levels}</ul>` : ""}
    ${sold ? `<p class="muted small">Bank full, sold for ${fmt(sum.sold_gold)} gold:</p><ul>${sold}</ul>` : ""}
    ${spilled ? `<p class="muted small">Bank full, sent to the stockpile:</p><ul>${spilled}</ul>` : ""}
    ${sum.stopped ? `<p class="tag bad">Stopped: ${esc(sum.stopped)}</p>` : ""}
    <p><button class="btn primary" data-close>Back to work</button></p>`);
}

// A raid or dragon attack, played out for everyone once: the clash, then the report.
function showThreat() {
  const t = S.threat_report;
  if (!t || watching === t.id || !$("#modal").hidden) return;
  watching = t.id;
  const r = t.report, dragon = t.kind === "dragon", won = r.title.startsWith("Victory");
  const foe = dragon ? "The dragon" : "Raiders";
  openModal(`
    <div class="battle">
      <h2>${dragon ? "🐉 The dragon attacks!" : "⚔️ The raiders attack!"}</h2>
      <div class="battle-side"><span><b>Our defence</b> <span class="muted">${fmt(r.defence)}</span></span>
        <div class="bar thick hp you"><span data-battle="us" style="width:100%"></span></div></div>
      <div class="battle-side"><span><b>${foe}</b> <span class="muted">${fmt(r.attack)}</span></span>
        <div class="bar thick hp"><span data-battle="them" style="width:100%"></span></div></div>
      <ul class="fight-log battle-log" data-battle="log"><li class="muted">${dragon ? "A shadow falls over the walls…" : "Horns sound from the walls…"}</li></ul>
      <div data-battle="report" hidden>
        <div class="battle-result ${won ? "win" : "loss"}">${esc(r.title)}</div>
        ${r.garrison.length ? `<p class="small muted">Garrison: ${r.garrison.map((g) => esc(g.name)).join(", ")}</p>` : ""}
        ${r.lines.map((l) => `<p class="small">${esc(l)}</p>`).join("")}
      </div>
      <p class="btns"><button class="btn" data-battle-skip>Skip</button>
        <button class="btn primary" data-raid-seen="${t.id}" hidden>Close</button></p>
    </div>`);
  playBattle(t.id, r.defence, r.attack, won, dragon);
}

// Pure theatre: the outcome is already decided. The loser's bar runs out; the winner's ends
// as high as the gap between the two sides.
function playBattle(id, us, them, won, dragon) {
  const steps = 10, every = 900;
  let seed = id * 9301 + 49297;
  const rand = () => (seed = (seed * 9301 + 49297) % 233280) / 233280;
  const weights = Array.from({ length: steps }, () => 0.5 + rand());
  const total = weights.reduce((a, b) => a + b, 0);
  const loserEnd = 0, winnerEnd = Math.max(0.1, 1 - Math.min(us, them) / Math.max(us, them, 1));
  const ours = won ? winnerEnd : loserEnd, theirs = won ? loserEnd : winnerEnd;
  const lines = {
    good: dragon ? ["Arrows find the dragon's wing", "The ballista bolt strikes home", "Spears drive it back from the walls"]
      : ["Arrows rain down on the raiders", "The walls hold", "The militia drives them back", "A charge breaks their line"],
    bad: dragon ? ["Fire sweeps the rooftops", "Its claws tear at the gate", "The defenders scatter from its breath"]
      : ["Raiders scale the walls", "The gate shudders under the ram", "A volley cuts down defenders"],
  };
  let step = 0, done = 0, said = "";
  const finish = () => {
    clearInterval(timer);
    const box = $(".battle");
    if (!box) return;
    $('[data-battle="us"]', box).style.width = `${ours * 100}%`;
    $('[data-battle="them"]', box).style.width = `${theirs * 100}%`;
    $('[data-battle="report"]', box).hidden = false;
    $("[data-battle-skip]", box).hidden = true;
    $("[data-raid-seen]", box).hidden = false;
  };
  const timer = setInterval(() => {
    const box = $(".battle");
    if (!box) return clearInterval(timer);
    if (step >= steps) return finish();
    done += weights[step] / total;
    step++;
    $('[data-battle="us"]', box).style.width = `${(1 - (1 - ours) * done) * 100}%`;
    $('[data-battle="them"]', box).style.width = `${(1 - (1 - theirs) * done) * 100}%`;
    // Each clash goes the way of the side that ends up ahead, now and then the other.
    const ahead = rand() < 0.7 ? won : !won;
    const pool = (ahead ? lines.good : lines.bad).filter((l) => l !== said);
    const log = $('[data-battle="log"]', box);
    said = pool[Math.floor(rand() * pool.length)];
    log.insertAdjacentHTML("afterbegin", `<li class="${ahead ? "good" : "bad"}">${said}</li>`);
    while (log.children.length > 4) log.lastElementChild.remove();
  }, every);
  playBattle.finish = finish;
}

function openModal(html) {
  const modal = $("#modal");
  modal.innerHTML = `<div class="modal-box">${html}</div>`;
  modal.hidden = false;
}

// --- rendering ------------------------------------------------------------

function render() {
  const kept = {};
  for (const el of document.querySelectorAll("[data-keep]")) kept[el.dataset.keep] = el.value;
  const focus = document.activeElement?.dataset?.keep;

  setHtml($("#side"), S.me ? sidebar() : `<div class="brand"><img src="/static/icon.svg" alt="">Guildhall <small>alpha</small></div>${S.dev ? devbar() : ""}`);
  setHtml($("#top"), topbar());
  setHtml($("#main"), S.me ? pageHtml() : register());

  for (const [key, value] of Object.entries(kept)) {
    const el = document.querySelector(`[data-keep="${key}"]`);
    if (el) el.value = value;
  }
  if (focus) document.querySelector(`[data-keep="${focus}"]`)?.focus();
  const msgs = $(".msgs");
  if (msgs) msgs.scrollTop = msgs.scrollHeight;
  animate();
}

// Only touch the DOM when the markup changed. Replacing an element mid-swipe
// cancels the swipe on iOS, and polls arrive every few seconds.
function setHtml(el, html) {
  if (el.dataset.html === html) return;
  const scroll = el.scrollTop;
  el.innerHTML = html;
  el.dataset.html = html;
  el.scrollTop = scroll;
}

function setMenu(open) {
  $("#app").classList.toggle("open", open);
  document.documentElement.classList.toggle("menu-open", open);
}

function nav(id, icon, label, meta = "", extra = "", tip = "") {
  return `<button class="nav ${page === id ? "on" : ""}" data-nav="${id}"${tip ? ` title="${esc(tip)}"` : ""}><span class="ic">${icon}</span><span class="label">${label}</span>${extra}<span class="meta">${meta}</span></button>`;
}

function sidebar() {
  const me = S.me, cls = C.classes[me.cls];
  const doing = me.action && C.actions.find((a) => a.id === me.action.id);
  const raid = S.upcoming?.kind === "raid";
  let html = `
    <div class="brand"><img src="/static/icon.svg" alt="">Guildhall <small>alpha</small></div>
    <div class="me">
      <div class="who">${esc(me.name)}</div>
      <div class="cls">${cls.icon} ${cls.name} · ${HEART} <span data-live-hp>${fmt(me.hp)}</span>/${me.max_hp}</div>
      <div class="purse"><span class="gold" title="Gold">${COIN} ${fmt(me.gold)}</span><span class="favour" title="Favour: earned by donating">${FAVOUR} ${fmt(me.favour)}</span></div>
    </div>
    <div class="navhead">City</div>
    ${nav("town", "🏘️", "Town square", `${S.city.population}`, "", `Population ${S.city.population}`)}
    ${nav("council", "📜", "Council & threats", "", raid ? `<span class="alert"></span>` : "", raid ? "A threat is coming" : "")}
    ${nav("board", "💬", "Town board")}
    ${nav("roster", "👥", "Guild roster", `${S.players.length}`, "", `${S.players.length} ${S.players.length === 1 ? "adventurer" : "adventurers"}`)}
    <div class="navhead">You</div>
    ${nav("character", cls.icon, "Character", `${skillOf("combat").icon} ${me.levels.combat}`, "", `Combat level ${me.levels.combat}`)}
    ${nav("bank", "🏦", "Bank", `${me.slots_used}/${me.slots}`, "", `${me.slots_used} of ${me.slots} bank slots used`)}`;
  let group = null;
  for (const skill of C.skills) {
    if (skill.class && skill.class !== me.cls) continue;
    if (skill.group !== group) {
      group = skill.group;
      html += `<div class="navhead">${group}</div>`;
    }
    const busy = doing?.skill === skill.id ? `<span class="dot"></span>` : "";
    html += nav("skill:" + skill.id, skill.icon, skill.name, `${me.levels[skill.id]}`, busy);
  }
  return html + (S.dev ? devbar() : "")
    + `<p class="credit">Icons by Lorc, Delapouite and others at <a href="https://game-icons.net" target="_blank" rel="noopener">game-icons.net</a>, CC BY 3.0</p>`;
}

function devbar() {
  return `<div class="devbar"><b>Dev mode</b> · playing as ${esc(S.uid)}
    <form data-form="dev-user"><input type="text" data-keep="dev-user" placeholder="switch user"><button class="btn sm">Go</button></form>
    <div class="row">
      <button class="btn sm" data-dev-advance="1">+1h</button>
      <button class="btn sm" data-dev-advance="8">+8h</button>
      <button class="btn sm" data-dev-advance="24">+1d</button>
      <button class="btn sm" data-dev-event>Threat now</button>
      <button class="btn sm" data-dev-happen="fortune">Fortune</button>
      <button class="btn sm" data-dev-happen="hardship">Hardship</button>
      <button class="btn sm" data-dev-happen="minor">Problem</button>
    </div></div>`;
}

const TITLES = { town: "Town square", council: "Council & threats", board: "Town board", roster: "Guild roster", bank: "Bank", character: "Character" };

function topbar() {
  let title = TITLES[page] || "Guildhall";
  if (page.startsWith("skill:")) title = skillOf(page.slice(6))?.name || title;
  if (page.startsWith("character:")) title = S.players.find((p) => p.id === page.slice(10))?.name || "Character";
  if (!S.me) title = "Welcome to Guildhall";
  let chips = "";
  if (S.me?.action) {
    const action = C.actions.find((a) => a.id === (S.me.action.growing || S.me.action.id));
    chips += `<button class="chip act" data-nav="skill:${action.skill}">${skillOf(action.skill).icon} <span class="label">${esc(action.name)}</span><span class="bar mini ${S.me.action.fight ? "foe" : ""}"><span data-progress></span></span></button>`;
  } else if (S.me) {
    chips += `<span class="chip muted">Idle${S.me.stopped ? ` · ${esc(S.me.stopped)}` : ""}</span>`;
  }
  const w = S.happenings?.weather;
  if (w) chips += `<button class="chip" data-nav="town" title="${esc(weatherTip(w))}">${w.icon}</button>`;
  if (S.upcoming) chips += `<button class="chip ${["raid", "dragon"].includes(S.upcoming.kind) ? "threat" : ""} ${S.upcoming.at_gates ? "alarm" : ""}" data-nav="council">${eventIcon(S.upcoming.kind)} ${S.upcoming.at_gates ? `<span class="label">${S.upcoming.kind === "dragon" ? "Overhead" : "At the gates"}</span> ` : ""}${eventWhen(S.upcoming, true)}</button>`;
  return `<button class="menu-btn" data-menu aria-label="Menu">☰</button><h1>${esc(title)}</h1>${chips}`;
}

function eventIcon(kind) {
  return { raid: "⚔️", dragon: "🐉", merchant: "🐪", refugees: "🧳" }[kind] || "❗";
}

function eventWhen(ev, short = false) {
  if (ev.exact) return short ? `in ${countdown(ev.exact)}` : `${clock(ev.exact)} (in ${countdown(ev.exact)})`;
  if (short) return ev.earliest <= serverNow() + 60 ? `within ${countdown(ev.latest)}` : `in ${countdown(ev.earliest)}–${countdown(ev.latest)}`;
  return `between ${clock(ev.earliest)} and ${clock(ev.latest)}`;
}

function pageHtml() {
  if (S.me.repick) return repickPage();
  if (page.startsWith("skill:")) {
    const id = page.slice(6);
    const skill = skillOf(id);
    if (skill && (!skill.class || skill.class === S.me.cls)) return skillPage(id);
    page = "town";
  }
  if (page.startsWith("character:")) return characterSheet(page.slice(10));
  if (page === "character") return characterSheet(S.uid);
  return ({ town, council, board, roster, bank }[page] || town)();
}

function itemChip(id, qty, have) {
  const short = have !== undefined && have < qty;
  return `<span class="item-chip ${short ? "short" : ""}" title="${esc([item(id).name, itemStats(id)].filter(Boolean).join(": "))}">${item(id).icon} ${fmt(qty)}${have !== undefined ? ` <span class="have">/ ${fmt(have)}</span>` : ""}</span>`;
}

// Progress towards a building cost: "have / need".
function costChip(icon, name, need, have) {
  return `<span class="item-chip ${have < need ? "short" : ""}" title="${esc(`${name}: ${have < need ? `${fmt(need - have)} more needed` : "done"}`)}">${icon} ${fmt(have)} <span class="have">/ ${fmt(need)}</span></span>`;
}

// --- skill pages ----------------------------------------------------------

function skillPage(id) {
  const me = S.me, skill = skillOf(id), level = me.levels[id], xp = me.xp[id];
  const floor = C.xp_table[level], ceil = C.xp_table[level + 1];
  const pct = ceil ? (xp - floor) / (ceil - floor) * 100 : 100;
  const cls = C.classes[me.cls];
  const fast = cls.fast.includes(id);
  let html = `
    <div class="panel"><div class="skill-head">
      <div class="big">${skill.icon}</div>
      <div class="info">
        <h2>${skill.name}</h2>
        <div class="lv">Level ${level} / 99 · ${fmt(xp)}${ceil ? ` / ${fmt(ceil)}` : ""} XP</div>
        <div class="bar xp thick"><span style="width:${pct}%"></span></div>
      </div>
      ${fast ? `<span class="tag gold">${cls.icon} ${cls.name} bonus</span>` : ""}
    </div></div>`;
  if (id === "combat") html += combatFrame();
  if (id === "prayer") html += prayerPanel();
  if (id === "construction") html += S.city.construction ? siteBanner()
    : `<div class="panel muted">Nothing under construction.</div>`;
  if (id === "farming" && me.cls === "homesteader") html += plotsPanel();
  html += potionPanel(id);
  if (`tool_${id}` in me.equip) html += toolPanel(id);
  if (id === "reconnaissance") html += `<div class="panel small muted">Raises intel on the coming threat. Higher levels open as it nears.</div>`;
  html += skillHappenings(id);
  const live = new Set(S.happenings.problems.map((p) => p.kind));
  const listed = C.actions.filter((a) => a.skill === id && (a.special !== "problem" || live.has(a.problem)));
  // Tabs and sections keep their designed order; what's inside each is sorted by the level it needs.
  const groups = [...new Set(listed.map((a) => a.group).filter(Boolean))];
  const actions = [...listed].sort((a, b) => a.level - b.level);
  if (groups.length > 2) {
    // Many groups: one tab each.
    const open = (g) => actions.some((a) => a.group === g && !isLocked(a));
    let current = tabs[id] || remember(`tab.${id}`);
    // Tier ladders open on the highest tier you can work; categories open on the first.
    const ladder = ["smithing", "leatherworking", "tailoring", "herblore", "combat"].includes(id);
    if (!groups.includes(current)) current = (ladder && [...groups].reverse().find(open)) || groups[0];
    const bar = groups.map((g) => `<button class="tab ${g === current ? "on" : ""} ${open(g) ? "" : "dim"}" data-tab="${id}" data-group="${esc(g)}">${esc(g)}</button>`).join("");
    // Ungrouped actions (the building site) stay above the tabs.
    const loose = actions.filter((a) => !a.group);
    if (loose.length) html += `<div class="grid" style="margin-bottom:14px">${loose.map(actionCard).join("")}</div>`;
    return html + `<div class="tabs">${bar}</div><div class="grid">${actions.filter((a) => a.group === current).map(actionCard).join("")}</div>`;
  }
  // A few groups: each under its own heading, in the order they first appear.
  let cards = actions.filter((a) => !a.group).map(actionCard).join("");
  for (const g of groups) {
    cards += `<div class="section-title grid-head">${esc(g)}</div>` + actions.filter((a) => a.group === g).map(actionCard).join("");
  }
  return html + `<div class="grid">${cards}</div>`;
}

// Locked: missing a level, class or building, as opposed to just out of materials.
function isLocked(a) {
  const why = S.me.blocked[a.id];
  return Boolean(why && (why.startsWith("Needs") || why.startsWith("Only")));
}

// A homesteader's two plots: one crop 30% faster, or two crops sharing a 20% faster pace.
function plotsPanel() {
  const a = S.me.action, farming = a && C.actions.find((x) => x.id === a.id)?.skill === "farming";
  const name = (id) => esc(C.actions.find((x) => x.id === id).name);
  const status = !farming ? `<span class="muted">Start a crop to plant plot 1.</span>`
    : a.plot2 ? `Plot 1: <b>${name(a.id)}</b> · Plot 2: <b>${name(a.plot2)}</b> <span class="muted">· alternating, 20% faster</span>`
    : `Plot 1: <b>${name(a.id)}</b> · Plot 2: <span class="muted">empty · focused, 30% faster</span>`;
  return `<div class="panel tool-panel"><span>🌱 ${status}</span></div>`;
}

// The skill's active potion, or the ones in the bank that could be drunk for it.
function potionPanel(skill) {
  const me = S.me;
  const kinds = Object.entries(C.items).filter(([, it]) => it.potion?.skill === skill);
  if (!kinds.length) return "";
  const active = me.potions[skill];
  const owned = kinds.filter(([id]) => me.bank[id]);
  const drink = owned.map(([id, it]) => `<button class="btn sm" data-potion="${id}" title="${esc(it.potion.text)}">${it.icon} ${esc(it.name)} (${fmt(me.bank[id])})</button>`).join("");
  return `<div class="panel tool-panel">${active
    ? `${item(active.item).icon} <b>${esc(item(active.item).name)}</b> <span class="muted">${esc(item(active.item).potion.text)} · ${fmt(active.charges)} uses left${me.bank[active.item] ? `, ${fmt(me.bank[active.item])} more in the bank` : ""}</span>`
    : `<span class="muted">No potion.</span>`}
    ${!active && drink ? `<span class="btns">Drink: ${drink}</span>` : ""}
    ${!active && !drink ? `<span class="small muted">Brewed in Herblore.</span>` : ""}
  </div>`;
}

function prayerPanel() {
  const me = S.me, city = S.city, level = me.levels.prayer;
  const cost = C.prayers.filter((p) => me.prayers.includes(p.id)).reduce((sum, p) => sum + p.cost, 0);
  const cards = C.prayers.map((p) => {
    const on = me.prayers.includes(p.id), locked = level < p.level;
    const full = !on && me.prayers.length >= C.max_prayers;
    return `<button class="prayer ${on ? "on" : ""} ${locked ? "locked" : ""}" data-pray="${p.id}" ${locked ? "disabled" : ""}
      title="${locked ? `Needs prayer level ${p.level}` : full ? `Max ${C.max_prayers} active` : ""}">
      <span class="ico">${p.icon}</span>
      <span class="grow"><b>${esc(p.name)}</b><span class="small muted">${esc(p.text)}</span></span>
      <span class="small ${locked ? "why" : "muted"}">${locked ? `Lv ${p.level}` : `${p.cost} pt${p.cost > 1 ? "s" : ""}/fight`}</span>
    </button>`;
  }).join("");
  const temple = city.buildings.temple.level;
  return `<div class="cols">
    <div class="panel"><h2>Prayers · ${me.prayers.length} / ${C.max_prayers} active</h2>
      <div class="prayer-points">${skillOf("prayer").icon} <b>${fmt(me.pp)}</b> prayer points${cost ? ` · ${cost} per fight (~${fmt(me.pp / cost)} fights)` : ""}</div>
      <div class="prayers">${cards}</div>
      <p class="small muted">Prayers cost points each fight. Bury bones for more.</p>
    </div>
    <div class="panel"><h2>Temple</h2>
      ${temple ? `<p>Devotion <b>${fmt(city.devotion)}</b> · ward <b>+${city.ward}</b> defence (max +${15 * temple})</p>
        <p class="small muted">Offerings ward the next raid. +${temple} prayer point${temple > 1 ? "s" : ""} per bone buried.</p>`
      : `<p class="muted">No temple yet.</p>`}
    </div></div>`;
}

function toolPanel(skill) {
  const tool = S.me.equip[`tool_${skill}`];
  return `<div class="panel tool-panel">${tool
    ? `${item(tool).icon} <b>${esc(item(tool).name)}</b> <span class="muted">${Math.round(item(tool).speed * 100)}% faster</span>
       <button class="btn sm" data-unequip="tool_${skill}">Unequip</button>`
    : `<span class="muted">No tool.</span>`}</div>`;
}

// A damage type's icon: what an enemy attacks with, or (tinted) what it's vulnerable to or resists.
function dmgIcon(type, how = "") {
  const t = C.damage_types[type], name = t.name.toLowerCase();
  const tip = how === "vuln" ? `Vulnerable to ${name} (+${Math.round((C.vulnerable - 1) * 100)}%)`
    : how === "resist" ? `Resists ${name} (-${Math.round((1 - C.resistant) * 100)}%)`
    : how === "attack" ? `Attacks with ${name}` : `${t.name} damage`;
  return `<span class="dmg ${how}" title="${esc(tip)}">${glyph(t.glyph, t.tint)}</span>`;
}

function resistIcons(v) {
  return v.vulnerable.map((k) => dmgIcon(k, "vuln")).join("") + v.resists.map((k) => dmgIcon(k, "resist")).join("");
}

// Who turns up in an encounter: each variant, what it attacks with, and how it takes each damage type.
// A variant your weapon is good against is green, one that resists it red.
function variantRows(e, o) {
  return `<div class="variants">${e.variants.map((v, i) => {
    const fit = o.variants[i].affinity;
    return `<div class="variant ${fit > 1 ? "good" : fit < 1 ? "bad" : ""}">
      <span class="v-attack">${v.attack.map((k) => dmgIcon(k, "attack")).join("")}</span>
      <span class="v-name">${esc(v.name)}${v.archetype === "elite" ? ` <span class="muted">· rare</span>` : ""}</span>
      <span class="v-hp muted">${fmt(v.hp)} HP</span>
      <span class="v-res">${resistIcons(v)}</span>
    </div>`;
  }).join("")}</div>`;
}

// Everything about fighting in one frame. Left: you, your prayers (switch them mid-fight) and your
// gear (swap it mid-fight). Right: what you're fighting, what it attacks with, what it's weak to and
// resists (your weapon's type outlined), and the fight as it plays out.
function combatFrame() {
  const me = S.me, a = me.action, f = a?.fight;
  const encounter = f && C.actions.find((x) => x.id === a.id);
  const bars = (who) => `<div class="bar hp ${who}"><span data-f="${who}-bar"${who === "you" ? ` data-live-hpbar style="width:${me.hp / me.max_hp * 100}%"` : ""}></span></div>
    <div class="bar swing"><span data-f="${who}-swing"></span></div>`;
  const you = `<div class="fighter">
      <div class="fighter-name"><b>${esc(me.name)}</b><span class="small muted">${HEART} <span data-f="you-hp">${fmt(me.hp)} / ${me.max_hp}</span></span></div>
      ${bars("you")}
      ${me.edible.length ? "" : `<div class="small warn">No food in your bank.</div>`}
    </div>`;
  let foe = `<div class="foe-idle muted">Not fighting.</div>`;
  if (f) {
    const mine = C.styles[(me.equip.weapon && item(me.equip.weapon).style) || "sword"].damage;
    const pills = (label, kinds, how) => kinds?.length ? `<div class="trait"><span class="muted small">${label}</span>
      ${kinds.map((k) => `<span class="pill ${how} ${k === mine && how !== "attack" ? "yours" : ""}">${dmgIcon(k, how)}${C.damage_types[k].name}</span>`).join("")}</div>` : "";
    foe = `<div class="foe-head"><span class="foe-ico">${encounter?.icon || ""}</span>
        <div class="fighter"><div class="fighter-name"><b>${esc(f.enemy)}</b><span class="small muted" data-f="foe-hp"></span></div>${bars("foe")}</div></div>
      ${f.foe ? `<div class="traits">${pills("Attacks with", f.foe.attack, "attack")}${pills("Weak to", f.foe.vulnerable, "vuln")}${pills("Resists", f.foe.resists, "resist")}</div>` : ""}
      <ul class="fight-log" data-f="log"></ul>`;
  }
  return `<div class="panel fight combat-frame" ${f ? `data-fight="${a.start}"` : ""}>
    <div class="you-side">${you}${prayerBar(me)}${paperDoll(me, true)}</div>
    <div class="foe-side">${foe}</div>
  </div>`;
}

// Prayers you can switch on and off between swings, and the points left to pay for them.
function prayerBar(me) {
  const level = me.levels.prayer;
  const buttons = C.prayers.filter((p) => p.level <= level).map((p) => {
    const on = me.prayers.includes(p.id);
    return `<button class="pray-btn ${on ? "on" : ""}" data-pray="${p.id}" title="${esc(`${p.name}: ${p.text} · ${p.cost} pt${p.cost > 1 ? "s" : ""}/fight`)}">${p.icon}</button>`;
  }).join("");
  return `<div class="prayer-bar"><span class="pp ${me.prayers.length && !me.blessing.cost ? "warn" : ""}" title="Prayer points">${skillOf("prayer").icon} ${fmt(me.pp)}</span>${buttons}</div>`;
}

function fightLine(e, enemy) {
  const [, who, kind, amount, , , food] = e;
  const type = kind === "hit" || kind === "crit" ? (C.damage_types[food] ? ` ${dmgIcon(food)}` : "") : "";
  const foe = esc(enemy);
  if (kind === "eat") return `<li class="good">You eat ${esc(item(food).name.toLowerCase())} (+${amount})</li>`;
  if (kind === "wind") return `<li class="good">Second wind! Back on your feet</li>`;
  if (kind === "block") return `<li class="good">You block ${foe}'s blow</li>`;
  if (who === "you") return kind === "miss" ? `<li class="muted">You miss</li>` : `<li>You ${kind === "crit" ? "<b>crit</b>" : "hit"} for <b>${amount}</b>${type}</li>`;
  return kind === "miss" ? `<li class="muted">${foe} misses</li>` : `<li class="bad">${foe} ${kind === "crit" ? "<b>crits</b>" : "hits"} you for <b>${amount}</b>${type}</li>`;
}

function animateFight(now) {
  const a = S.me?.action, f = a?.fight;
  if (!f) return;
  const t = now - a.start;
  const over = t >= f.end;
  // From the kill until the next enemy turns up (the next fight's start, once the server sends it),
  // the panel is the same quiet countdown: no enemy, both swing timers empty.
  const waiting = t < 0 || (over && f.result === "won");
  const respawnIn = t < 0 ? -t : f.end + (a.respawn || 1) - t;
  let shown = -1;
  while (shown + 1 < f.events.length && f.events[shown + 1][0] <= t) shown++;
  const last = f.events[shown];
  const hp = last ? last[4] : f.start_hp, foeHp = waiting ? 0 : last ? last[5] : f.enemy_hp;
  for (const el of document.querySelectorAll("[data-progress]")) el.style.width = `${foeHp / f.enemy_hp * 100}%`;
  const panel = $("[data-fight]");
  if (!panel) return;
  panel.classList.toggle("waiting", waiting);
  // Your HP everywhere follows the fight as it plays out.
  for (const el of document.querySelectorAll("[data-live-hp]")) el.textContent = fmt(hp);
  for (const el of document.querySelectorAll("[data-live-hpbar]")) el.style.width = `${Math.max(0, hp / f.top * 100)}%`;
  const set = (key, fn) => { const el = panel.querySelector(`[data-f="${key}"]`); if (el) fn(el); };
  set("you-bar", (el) => { el.style.width = `${Math.max(0, hp / f.top * 100)}%`; });
  set("foe-bar", (el) => { el.style.width = `${Math.max(0, foeHp / f.enemy_hp * 100)}%`; });
  set("you-hp", (el) => { el.textContent = `${fmt(hp)} / ${fmt(f.top)}`; });
  set("foe-hp", (el) => { el.textContent = waiting ? "" : `${fmt(foeHp)} / ${fmt(f.enemy_hp)}`; });
  for (const [who, every] of [["you", f.interval], ["foe", f.enemy_interval]]) {
    let swung = 0;
    for (let i = shown; i >= 0; i--) if (f.events[i][1] === who && f.events[i][2] !== "eat" && f.events[i][2] !== "wind") { swung = f.events[i][0]; break; }
    set(`${who}-swing`, (el) => { el.style.width = over || waiting ? "0%" : `${Math.min(100, (t - swung) / every * 100)}%`; });
  }
  set("log", (el) => {
    const key = `${a.start}:${shown}:${over}:${waiting ? Math.ceil(respawnIn * 10) : ""}`;
    if (el.dataset.key === key) return;
    el.dataset.key = key;
    const lines = f.events.slice(Math.max(0, shown - 5), shown + 1).reverse().map((e) => fightLine(e, f.enemy));
    if (over && !waiting) lines.unshift(`<li class="bad"><b>You fall back.</b></li>`);
    el.innerHTML = waiting ? `<li class="good"><b>Victory!</b> ${respawnIn > 0.05 ? `Next enemy in ${respawnIn.toFixed(1)}s` : "Next enemy coming…"}</li>`
      : lines.join("") || `<li class="muted">Squaring up…</li>`;
  });
}

// Power, armour and ward, and the armour's weight.
function gearStats(it) {
  const stats = [it.power && `+${it.power} power`, it.armour && `+${it.armour} armour`, it.ward && `+${it.ward} ward`];
  return stats.filter(Boolean).join(", ") + (it.weight ? ` (${C.weights[it.weight].name.toLowerCase()})` : "");
}

const GEAR_SLOTS = ["weapon", "shield", "helmet", "body", "legs"];

// A weapon's or armour piece's stats in a small grid. Weapons: damage type and power | 1H or 2H | swing
// time; armour: armour | weight | ward. Below: what it needs to wear, and any bonus for you.
function gearChips(it, who = S.me) {
  const cell = (icon, text, tip, cls = "") => `<span class="gstat ${cls}" title="${esc(tip)}">${icon}${text === "" ? "" : `<span>${text}</span>`}</span>`;
  const hands = (two) => `<span class="hands">${two ? "2H" : "1H"}</span>`;
  let row = ["", "", ""];
  if (it.style) {
    const st = C.styles[it.style], dt = C.damage_types[st.damage];
    row = [cell(glyph(dt.glyph, dt.tint), it.power, `${dt.name} damage, +${it.power} power`),
      cell(hands(it.two_handed), "", it.two_handed ? "Two-handed: no shield" : "One-handed: room for a shield"),
      cell(glyph("stopwatch", "#9fb3c8"), `${st.interval}s`, `A swing every ${st.interval}s`)];
  } else if (it.slot === "shield") {
    row = [cell(glyph("checked-shield", "#d4dae2"), it.armour, `+${it.armour} armour, +${it.power} power`),
      cell(hands(false), "", "Held in one hand"),
      cell(glyph("checked-shield", "#e0b04a"), `${Math.round(C.block_chance * 100)}%`, "Blocks this share of hits")];
  } else if (it.weight) {
    row = [cell(glyph("checked-shield", "#d4dae2"), it.armour, `+${it.armour} armour: less damage from blows`),
      cell("", C.weights[it.weight].name, `${C.weights[it.weight].name} armour`, "muted"),
      cell(glyph("magic-shield", "#a77be8"), it.ward, `+${it.ward} ward: less damage from magic`)];
  }
  let req = "", bonus = "";
  if (it.req) {
    const [skill, level] = it.req;
    req = cell(skillOf(skill).icon, level, `Needs ${skillOf(skill).name.toLowerCase()} ${level}`, who.levels[skill] < level ? "short" : "");
  }
  if (it.style && C.class_style[who.cls] === it.style) {
    bonus = cell(C.classes[who.cls].icon, "+15%", "The trade's own weapon: +15% damage", "trade");
  }
  return `<div class="stat-grid">${row.join("")}${req}<span></span>${bonus || "<span></span>"}</div>`;
}

// What an item does once made: healing, defence, tool speed, and who can use it.
function itemStats(id) {
  const it = item(id);
  const parts = [];
  if (it.heal) parts.push(`❤️ Heals ${it.heal}`);
  if (it.food) parts.push(`feeds ${it.food} for 2 days`);
  if (it.power) parts.push(`+${it.power} power`);
  if (it.style) {
    const st = C.styles[it.style], trade = Object.entries(C.class_style).find(([, s]) => s === it.style)?.[0];
    parts.push(`${it.two_handed ? "two-handed " : ""}${st.name}, ${st.interval}s${trade ? ` (${C.classes[trade].name.toLowerCase()})` : ""}`);
  }
  if (it.armour || it.ward) parts.push(gearStats({ ...it, power: 0 }));
  if (it.reagent) parts.push(`Reagent for ${C.weights[it.reagent].name.toLowerCase()} armour`);
  if (it.tool) parts.push(`${Math.round(it.speed * 100)}% faster ${skillOf(it.tool).name.toLowerCase()}`);
  if (it.req && it.req[1] > 1) parts.push(`needs ${skillOf(it.req[0]).name.toLowerCase()} ${it.req[1]}`);
  if (it.potion) parts.push(`${it.potion.text}, ${C.potion_charges} uses`);
  if (it.trophy) parts.push(`Trophy for stronger weapons`);
  if (it.fitting) {
    const f = C.fittings.find((x) => x.id === id), done = S.city.buildings[f.building].fittings.includes(id);
    parts.push(`${C.buildings[f.building].icon} ${C.buildings[f.building].name} Lv ${f.level}: ${f.effect}${done ? " · fitted" : ""}`);
  }
  return parts.join(", ");
}

function actionCard(a) {
  const me = S.me;
  const active = me.action?.id === a.id;
  const second = me.action?.plot2 === a.id;  // a homesteader's second plot
  const growingNow = me.action?.growing === a.id;
  const canPlot = me.cls === "homesteader" && a.skill === "farming" && !a.special && !active && !second
    && me.action && C.actions.find((x) => x.id === me.action.id)?.skill === "farming" && !me.action.left;
  const why = me.blocked[a.id];
  const locked = isLocked(a);
  const out = Object.keys(a.outputs)[0];
  const icon = a.icon;
  const time = me.times[a.id];
  let io = "";
  if (Object.keys(a.inputs).length) {
    io += Object.entries(a.inputs).map(([id, q]) => itemChip(id, q, me.bank[id] || 0)).join("")
      + (Object.keys(a.outputs).length ? `<span class="arrow">→</span>` : "");
  }
  io += Object.entries(a.outputs).map(([id, q]) => itemChip(id, q)).join("");
  let extra = "";
  if (a.enemy) {
    const o = me.fight_odds[a.id], e = a.enemy;
    extra = `${e.boss ? `<div><span class="tag warn">Boss</span></div>` : ""}${variantRows(e, o)}`;
    if (a.gold) io += `<span class="item-chip" title="Gold: ${a.gold[0]}–${a.gold[1]} a kill">${COIN} ${a.gold[0]}–${a.gold[1]}</span>`;
    if (a.drops) io += a.drops.map(([id, q, odds]) => `<span class="item-chip" title="${esc(item(id).name)}${q > 1 ? ` ×${q}` : ""}: ${Math.round(odds * 100)}% chance">${item(id).icon} ${Math.round(odds * 100)}%</span>`).join("");
    if (a.special === "sabotage") extra += `<div class="small muted">-3% raid strength per win (max 30%)</div>`;
  }
  if (a.special === "drill") {
    const s = S.favours.sergeant, boost = s.boost;
    extra = !s.needed ? `<div class="small muted">Only while a raid is coming.</div>`
      : `<div class="small makes">${skillOf("combat").icon} +${+me.drill_per_action.toFixed(2)} drill · ${fmt(s.points)} / ${fmt(s.needed)} points, worth ${fmt(s.defence)} of ${fmt(s.cap)} defence</div>
      ${boostBar(s.points, s.needed, boost, "Drill sergeant: this stretch drills twice as fast")}`;
  }
  if (a.special === "recon") {
    const boost = S.favours.informant.boost;
    const ev = S.upcoming, full = ev && ev.recon >= ev.recon_full;
    extra = full ? `<div class="small muted">Fully scouted: XP only.</div>`
      : `<div class="small makes">${skillOf("reconnaissance").icon} +${+me.recon_gain[a.id].toFixed(2)} recon</div>
      ${ev?.recon_full ? boostBar(ev.recon, ev.recon_full, boost, "Informant: this stretch scouts twice as fast") : ""}`;
  }
  const temple = S.city.buildings.temple?.level || 0;
  if (a.special === "labour") {
    extra = `<div class="small makes">${skillOf("construction").icon} +${me.labour_per_action} labour per action</div>`;
  }
  if (a.special === "bury") extra = `<div class="small makes">${skillOf("prayer").icon} +${a.pp + temple} prayer points</div>`;
  if (a.special === "offer") extra = `<div class="small makes">${C.buildings.temple.icon} +${+(a.devotion * (1 + 0.25 * temple)).toFixed(1)} devotion</div>`;
  const gear = Object.keys(a.outputs).filter((id) => GEAR_SLOTS.includes(item(id).slot));
  const made = Object.keys(a.outputs).filter((id) => !gear.includes(id)).map(itemStats).filter(Boolean);
  extra += gear.map((id) => gearChips(item(id))).join("");
  if (made.length) extra += `<div class="small makes">${made.join(" · ")}</div>`;
  return `
    <div class="action ${active || second ? "active" : ""} ${locked ? "locked" : ""}">
      <div class="top"><div class="ico">${icon}</div><div>
        <div class="name">${esc(a.name)}</div>
        <div class="sub">Level ${a.level} · ${dur(time)} · ${a.xp} XP</div>
      </div></div>
      ${io ? `<div class="io">${io}</div>` : ""}
      ${extra}
      ${me.action?.plot2 && (active || second) ? `<div class="small muted">Plot ${active ? 1 : 2}${growingNow ? " · growing now" : " · next"}</div>` : ""}
      ${growingNow && !a.enemy ? `<div class="bar thick"><span data-progress></span></div>` : ""}
      ${active && a.enemy ? `<div><span class="tag gold">⚔️ Fighting</span></div>` : ""}
      ${active && me.action.left ? `<div class="small muted">Just one${me.action.resume ? `, then back to ${esc(C.actions.find((x) => x.id === me.action.resume).name.toLowerCase())}` : ""}</div>` : ""}
      <div class="foot">
        <span class="why">${!active && !second && why ? esc(why) : ""}</span>
        ${second ? `<button class="btn" data-plot="">Clear plot 2</button>`
          : active ? `<button class="btn danger" data-stop>Stop</button>`
          : `<span class="btns"><button class="btn" data-once="${a.id}" ${why ? "disabled" : ""} title="Once, then resume">${a.enemy ? "Fight once" : Object.keys(a.outputs).length ? "Make one" : "Once"}</button>
             ${canPlot ? `<button class="btn" data-plot="${a.id}" ${why ? "disabled" : ""} title="Grow in plot 2">Plot 2</button>` : ""}
             <button class="btn primary" data-start="${a.id}" ${why ? "disabled" : ""}>Start</button></span>`}
      </div>
    </div>`;
}

// --- bank -----------------------------------------------------------------

function bank() {
  const me = S.me;
  const entries = Object.entries(me.bank).sort((x, y) => Object.keys(C.items).indexOf(x[0]) - Object.keys(C.items).indexOf(y[0]));
  if (selected && !me.bank[selected]) selected = null;
  // An item past one full stack spills into more slots: 2,500 coal shows as 1,000 + 1,000 + 500.
  const stacks = entries.flatMap(([id, q]) => {
    const parts = [];
    for (let left = q; left > 0; left -= me.stack) parts.push([id, Math.min(left, me.stack)]);
    return parts;
  });
  let slots = stacks.map(([id, q]) => `
    <button class="slot ${selected === id ? "on" : ""}" data-select="${id}" title="${esc(item(id).name)}: ${fmt(me.bank[id])}${me.bank[id] > me.stack ? ` across ${Math.ceil(me.bank[id] / me.stack)} slots` : ""}">
      <span class="qty ${q >= me.stack ? "full" : ""}">${fmt(q)}</span>${item(id).icon}<span class="nm">${esc(item(id).name)}</span>
    </button>`).join("");
  for (let i = stacks.length; i < me.slots; i++) slots += `<div class="slot empty"></div>`;
  return `
    <div class="bank-wrap">
      <div>
        <div class="panel">
          <h2>Bank · ${me.slots_used} / ${me.slots} slots · ${fmt(me.stack)} per stack</h2>
          <div class="slots">${slots}</div>
          <p class="small muted">Bank full:
            <button class="btn sm ${me.overflow === "city" ? "gold" : ""}" data-overflow="city">Send it to the city</button>
            <button class="btn sm ${me.overflow === "stop" ? "gold" : ""}" data-overflow="stop">Stop working</button>
            <br>Overflow earns half favour; what the city can't use is sold.</p>
        </div>
        ${favourPanel()}
      </div>
      <div>${selected ? itemPanel(selected) : goldPanel()}</div>
    </div>`;
}

function itemPanel(id) {
  const me = S.me, it = item(id), have = me.bank[id];
  const merchant = S.city.merchant_until > serverNow();
  const price = it.value * (merchant ? 1.5 : 1);
  const others = S.players.filter((p) => p.id !== S.uid);
  const qtyBtns = (attr) => [1, 10, 100].filter((q) => q <= have).map((q) => `<button class="btn sm" ${attr}="${id}" data-qty="${q}">${q}</button>`).join("")
    + `<button class="btn sm" ${attr}="${id}" data-qty="all">All (${fmt(have)})</button>`;
  return `<div class="panel item-panel">
    <div class="ico">${it.icon}</div>
    <h3>${esc(it.name)}</h3>
    <div class="muted small">You have ${fmt(have)} · worth ${price % 1 ? price.toFixed(1) : price} gold each${merchant ? " (merchant in town!)" : ""}</div>
    ${GEAR_SLOTS.includes(it.slot) ? gearChips(it) : ""}
    ${it.slot ? equipRow(id, it) : ""}
    ${it.potion ? `<div class="row"><div class="small">${esc(it.potion.text)} for ${C.potion_charges} ${it.potion.skill === "combat" ? "fights" : "actions"}.</div>
      <button class="btn gold" data-potion="${id}">Drink</button>
      ${S.me.potions[it.potion.skill] && S.me.potions[it.potion.skill].item !== id ? `<div class="small why">Replaces your ${esc(item(S.me.potions[it.potion.skill].item).name.toLowerCase())} (${S.me.potions[it.potion.skill].charges} uses left)</div>` : ""}</div>` : ""}
    ${it.heal ? `<div class="row"><div class="small muted">Heals ${it.heal} in fights.</div>
      ${S.me.food === id ? `<span class="tag good">Your fighting food</span>` : `<button class="btn sm" data-food="${id}">Eat this first in fights</button>`}</div>` : ""}
    ${it.food ? `<div class="row small muted">Feeds ${it.food} townsfolk for 2 days.</div>` : ""}
    ${C.city_uses[id].length
      ? `<div class="row"><div class="k">Donate to the city · +${it.value} favour each</div><div class="btns">${qtyBtns("data-donate")}</div>
          <div class="small muted">Used for ${esc(listing(C.city_uses[id]))}.</div></div>`
      : `<div class="row small muted">The city has no use for this.</div>`}
    ${others.length ? `<div class="row"><div class="k">Give to <select data-keep="give-to">${others.map((p) => `<option value="${esc(p.id)}">${esc(p.name)}</option>`).join("")}</select></div><div class="btns">${qtyBtns("data-give")}</div></div>` : ""}
    <div class="row"><div class="k">Sell</div><div class="btns">${qtyBtns("data-sell")}</div></div>
    <div class="row"><button class="btn sm" data-select="">Close</button></div>
  </div>${goldPanel()}`;
}

function listing(words) {
  return words.length < 2 ? words.join("") : `${words.slice(0, -1).join(", ")} and ${words.at(-1)}`;
}

function equipRow(id, it) {
  const [skill, level] = it.req || [];
  const short = skill && S.me.levels[skill] < level;
  return `<div class="row"><button class="btn gold" data-equip="${id}" ${short ? "disabled" : ""}>${equipLabel(it)}</button>
    ${skill ? `<div class="small ${short ? "why" : "muted"}">Needs ${esc(skillOf(skill).name.toLowerCase())} level ${level}</div>` : ""}</div>`;
}

function equipLabel(it) {
  if (it.tool) return `Use as ${skillOf(it.tool).name.toLowerCase()} tool (${Math.round(it.speed * 100)}% faster)`;
  return "Equip";
}

function goldPanel() {
  return `<div class="panel"><h2>Gold</h2>
    <p class="gold">${COIN} ${fmt(S.me.gold)}</p>
    <form data-form="gold" class="btns"><input type="number" min="1" data-keep="gold" placeholder="Amount" style="width:120px"><button class="btn gold">Donate to treasury</button></form>
    <p class="small muted">1 favour per gold.</p></div>`;
}

function favourPanel() {
  const me = S.me;
  return `<div class="panel"><h2>Favour with the council</h2>
    <p class="favour">${FAVOUR} ${fmt(me.favour)} favour · ${fmt(me.donated)} given in total</p>
    <div class="btns"><button class="btn" data-perk="bank_slot" ${me.favour < me.perk_costs.bank_slot ? "disabled" : ""}>+1 bank slot (${fmt(me.perk_costs.bank_slot)} favour)</button></div>
    <p class="small muted">More to spend on in <button class="linkish" data-nav="council">Council &amp; threats</button>.</p></div>`;
}

// --- town -----------------------------------------------------------------

function town() {
  const city = S.city;
  const growth = city.starving ? `<span class="bad">Hungry: ${city.growth} a day</span>`
    : city.growth > 0 ? `+${city.growth} a day`
    : city.growth < 0 ? `<span class="bad">Overcrowded: ${city.growth} a day</span>`
    : `<span class="warn">Full: build houses</span>`;
  const next = city.next_tier ? `${city.next_tier.name} at ${city.next_tier.pop} people` : "Largest tier";
  let html = `<div class="stats">
    <div class="stat"><div class="k">Settlement</div><div class="v">${city.tier_name}</div><div class="note">${next}</div></div>
    <div class="stat"><div class="k">Population</div><div class="v">${city.population} <small>/ ${city.housing} homes</small></div><div class="note">${growth}</div></div>
    <div class="stat"><div class="k">Food</div><div class="v ${city.food_days < 1 ? "bad" : ""}">${city.food_days ?? 0} <small>days</small></div><div class="note">${fmt(city.food)} meals in the granary</div></div>
    <div class="stat"><div class="k">Treasury</div><div class="v gold">${fmt(city.treasury)}</div><div class="note">Day ${city.day}</div></div>
    <div class="stat"><div class="k">Defence</div><div class="v">${fmt(city.defence.total)}</div><div class="note">${city.repelled} raid${city.repelled === 1 ? "" : "s"} repelled</div></div>
    ${weatherCard()}
  </div>`;
  html += happeningsPanel();
  if (city.starving) html += `<div class="banner bad">🍞<div class="grow"><b>Granary empty.</b> People are leaving, defence is down. Donate food.</div></div>`;
  if (city.merchant_until > serverNow()) html += `<div class="banner">🐪<div class="grow"><b>Merchant in town.</b> Sell prices +50% for ${countdown(city.merchant_until)}.</div></div>`;
  if (city.construction) html += siteBanner();
  html += `<div class="section-title">Buildings</div>
    <p class="small muted">Funds are safe from raiders. Building starts once a fund is full.</p>
    <div class="grid wide">${Object.entries(city.buildings).map(([key, b]) => buildingCard(key, b)).join("")}</div>`;
  html += `<div class="section-title">City stockpile</div><div class="panel">`;
  const stock = Object.entries(city.stockpile);
  html += stock.length ? `<div class="stock">${stock.map(([id, q]) => itemChip(id, q)).join("")}</div>` : `<p class="muted">Empty.</p>`;
  html += `<p class="small muted">Feeds the granary and armoury. Raiders can loot it.</p></div>`;
  return html;
}

// Progress towards a goal favour can boost. Favour doubles the next `boost` points players put
// in, so the striped stretch behind the bar (twice the boost) is where work counts double.
function boostBar(done, total, boost, tip) {
  const pct = (x) => Math.min(100, x / total * 100);
  return `<div class="bar gold thick boost-bar"${boost ? ` title="${esc(tip)}"` : ""}>${boost
    ? `<span class="boost" style="width:${pct(done + 2 * boost)}%"></span>` : ""}<span style="width:${pct(done)}%"></span></div>`;
}

// The building site: labour so far, who is helping, and ways to speed it up.
function siteBanner() {
  const city = S.city, work = city.construction, me = S.me;
  const spec = C.buildings[work.building];
  const queued = city.queue.map((key) => esc(C.buildings[key].name)).join(", ");
  const hire = S.favours.builders;
  const working = me.action?.id === "labour";
  const builders = S.players.filter((p) => p.skill === "construction" && p.doing === "Work on the building site").map((p) => esc(p.name));
  return `<div class="banner"><span class="banner-ico">${skillOf("construction").icon}</span><div class="grow">
    <div class="site-head"><b>${work.repair ? "Repairing" : "Building"} ${esc(spec.name)}</b>
      <span class="muted small">${fmt(work.labour)} / ${fmt(work.needed)} labour</span>
      <span class="btns">
        ${working ? `<span class="btn sm working">Working</span>` : `<button class="btn sm primary" data-start="labour">Work on it</button>`}
        ${hire.why ? "" : `<button class="btn sm gold" data-favour="builders" ${me.favour < hire.cost ? "disabled" : ""} title="×2 labour and XP for the next ${hire.labour}">Master builder ${FAVOUR} ${fmt(hire.cost)}</button>`}
      </span></div>
    ${boostBar(work.labour, work.needed, hire.boost, "Master builder: this stretch builds twice as fast")}
    <div class="small muted" style="margin-top:6px">${builders.length ? `On site: ${builders.join(", ")}. ` : ""}Townsfolk +${fmt(city.townsfolk_labour)}/h.${queued ? ` Next: ${queued}.` : ""}</div>
  </div></div>`;
}

// "Rain: farming 10% faster. Clear skies in 3h 20m."
function weatherTip(w) {
  return `${w.name}: ${w.text.charAt(0).toLowerCase()}${w.text.slice(1)}. ${w.next_name} in ${dur(w.until - serverNow())}.`;
}

function weatherCard() {
  const h = S.happenings, w = h.weather;
  return `<div class="stat" title="${esc(weatherTip(w))}"><div class="k">${h.season.icon} ${h.season.name}, day ${h.season.day}</div>
    <div class="v">${w.icon} <small>${esc(w.name)}</small></div>
    <div class="note">${w.next_icon} ${esc(w.next_name)} in ${countdown(w.until)}</div></div>`;
}

// Everything going on in the city right now, and what anyone can do about it.
function happeningsPanel() {
  const h = S.happenings, me = S.me, city = S.city;
  const rows = [];
  if (h.weather.kind !== "clear") rows.push(`<div class="happening"><span class="ico">${h.weather.icon}</span><span class="grow"><b>${esc(h.weather.name)}</b><span class="small muted">${esc(h.weather.text)}</span></span></div>`);
  if (h.cold) rows.push(`<div class="happening bad"><span class="ico">🥶</span><span class="grow"><b>Out of firewood</b><span class="small muted">City eats 50% more. Donate logs.</span></span></div>`);
  for (const e of h.effects) {
    const hire = e.offer ? `<button class="btn sm gold" data-hire ${city.treasury < e.cost ? "disabled" : ""}>Hire for ${fmt(e.cost)} gold</button>` : "";
    rows.push(`<div class="happening"><span class="ico">${e.icon}</span><span class="grow"><b>${esc(e.name)}</b>
      <span class="small muted">${esc(e.text)} · ${countdown(e.until)} left</span></span>${hire}</div>`);
  }
  for (const p of h.problems) {
    let help = "";
    if (p.action) {
      const a = C.actions.find((x) => x.id === p.action);
      help = `<span class="small muted">${fmt(p.work)} / ${fmt(p.needed)} done</span>
        <button class="btn sm primary" data-nav="skill:${a.skill}">${esc(a.name)}</button>`;
    }
    const gifts = Object.entries(p.need || {}).map(([id, need]) => {
      const missing = p.missing[id] || 0;
      const mine = Math.min(missing, me.bank[id] || 0), stores = Math.min(missing, city.stockpile[id] || 0);
      return `<div class="fund-row">${costChip(item(id).icon, item(id).name, need, need - missing)}<span class="btns">
        ${mine ? `<button class="btn sm gold" data-aid="${p.kind}" data-item="${id}" data-source="bank">Give ${fmt(mine)}</button>` : ""}
        ${stores ? `<button class="btn sm" data-aid="${p.kind}" data-item="${id}" data-source="city">Stockpile ${fmt(stores)}</button>` : ""}
      </span></div>`;
    }).join("");
    rows.push(`<div class="happening bad"><span class="ico">${p.icon}</span><span class="grow"><b>${esc(p.name)}</b>
      <span class="small muted">${esc(p.text)}${p.until ? ` · ${countdown(p.until)} left` : ""}</span>${gifts}</span>${help}</div>`);
  }
  if (!rows.length) return "";
  return `<div class="panel"><h2>Happenings</h2><div class="happenings">${rows.join("")}</div></div>`;
}

// What's speeding up, slowing down or blocking this skill right now.
function skillHappenings(skill) {
  const h = S.happenings, lines = [];
  const note = (icon, name, text) => lines.push(`<span>${icon} <b>${esc(name)}</b> <span class="muted">${esc(text)}</span></span>`);
  const touches = (src) => ["speed", "yield", "xp"].some((k) => src[k] && skill in src[k]) || (src.block && skill in src.block);
  if (touches(h.weather)) note(h.weather.icon, h.weather.name, h.weather.text);
  for (const e of h.effects) if (touches(e)) note(e.icon, e.name, e.text);
  for (const p of h.problems) {
    if (!C.problems[p.kind] || !touches(C.problems[p.kind])) continue;
    const fix = p.action && C.actions.find((x) => x.id === p.action);
    note(p.icon, p.name, !fix ? p.text : fix.skill === skill ? "Clear it below." : `${skillOf(fix.skill).name} clears it (Town square).`);
  }
  return lines.length ? `<div class="panel tool-panel skill-happenings">${lines.join("")}</div>` : "";
}

function buildingCard(key, b) {
  const spec = C.buildings[key], city = S.city, me = S.me;
  const tags = {
    building: `<span class="tag gold">Under construction</span>`,
    queued: `<span class="tag good">Funded · queued</span>`,
    max: `<span class="tag good">Fully built</span>`,
    capped: `<span class="tag">Needs a bigger settlement</span>`,
  };
  let body = tags[b.status] ? `<div>${tags[b.status]}</div>` : "";
  if (b.status === "funding" || b.status === "queued") {
    body += `<div class="fund">${Object.entries(b.target).map(([id, need]) => {
      const missing = b.missing[id] || 0;
      const gold = id === "gold";
      const mine = Math.min(missing, gold ? me.gold : me.bank[id] || 0);
      const stores = Math.min(missing, gold ? city.treasury : city.stockpile[id] || 0);
      const chip = costChip(gold ? COIN : item(id).icon, gold ? "Gold" : item(id).name, need, need - missing);
      return `<div class="fund-row">${chip}<span class="btns">
        ${mine ? `<button class="btn sm gold" data-fund="${key}" data-item="${id}" data-source="bank" title="From your ${gold ? "purse" : "bank"}, earns favour">Give ${fmt(mine)}</button>` : ""}
        ${stores ? `<button class="btn sm" data-fund="${key}" data-item="${id}" data-source="city" title="From the city's ${gold ? "treasury" : "stockpile"}">${gold ? "Treasury" : "Stockpile"} ${fmt(stores)}</button>` : ""}
      </span></div>`;
    }).join("")}</div>`;
  }
  body += fittingRows(key, b);
  const levelText = b.cap < spec.max ? `Lv ${b.level} / ${b.cap} (${city.tier_name.toLowerCase()} cap)` : `Lv ${b.level} / ${spec.max}`;
  return `<div class="action building ${b.damaged ? "damaged" : ""}">
    <div class="top"><div class="ico">${spec.icon}</div><div>
      <div class="name">${esc(spec.name)} <span class="lv muted">${levelText}</span> ${b.damaged ? `<span class="tag bad">Damaged</span>` : ""}</div>
      <div class="sub">${esc(spec.effect)}</div>
    </div></div>${body}</div>`;
}

// Fittings Construction makes for this building: fitted, ready to fit, or waiting on a level.
function fittingRows(key, b) {
  const rows = C.fittings.filter((f) => f.building === key).map((f) => {
    const it = item(f.id), recipe = C.actions.find((a) => a.id === `make_${f.id}`);
    let state;
    if (b.fittings.includes(f.id)) {
      state = b.damaged ? `<span class="tag bad">Paused</span>` : `<span class="tag good">Fitted</span>`;
    } else if (b.level < f.level) {
      state = `<span class="tag">Needs Lv ${f.level}</span>`;
    } else {
      const mine = S.me.bank[f.id] || 0, stores = S.city.stockpile[f.id] || 0;
      state = mine || stores
        ? `${mine ? `<button class="btn sm gold" data-install="${f.id}" data-source="bank" title="From your bank, earns favour">Fit</button>` : ""}
           ${stores ? `<button class="btn sm" data-install="${f.id}" data-source="city" title="From the city's stockpile">Fit from stockpile</button>` : ""}`
        : `<span class="muted small">Construction ${recipe.level}</span>`;
    }
    return `<div class="fitting-row"><span class="fit-ico">${it.icon}</span>
      <span class="fitting-text"><b>${esc(f.name)}</b> <span class="muted small">${esc(f.effect)}</span></span>
      <span class="btns">${state}</span></div>`;
  });
  return rows.length ? `<div class="fittings">${rows.join("")}</div>` : "";
}

// --- council --------------------------------------------------------------

function pips(level) {
  return `<span class="pips" title="Intel level ${level} of 3">${[1, 2, 3].map((i) => `<i class="${i <= level ? "on" : ""}"></i>`).join("")}</span>`;
}

function reconText(ev) {
  const points = `${fmt(ev.recon)} / ${fmt(ev.recon_full)} points`;
  if (ev.intel >= 3) return `${points} · complete`;
  if (ev.recon_next <= 0) return `${points} · next level opens closer to the threat`;
  return `${points} · ${fmt(ev.recon_next)} to the next level`;
}

function council() {
  const ev = S.upcoming, city = S.city, me = S.me;
  let html = "";
  if (!ev) {
    html += `<div class="panel"><h2>All quiet</h2><p class="muted">No news on the roads.</p></div>`;
  } else {
    const threat = ["raid", "dragon"].includes(ev.kind);
    html += `<div class="panel ${threat ? "threat-card" : ""}">
      <h2>${eventIcon(ev.kind)} ${threat ? "Threat" : "News"} · intel ${pips(ev.intel)}</h2>
      <div class="headline">${esc(ev.headline)}</div>
      <div class="kv">
        <span class="k">Expected</span><span>${eventWhen(ev)}</span>
        ${ev.range ? `<span class="k">Strength</span><span>${ev.strength ?? `${ev.range[0]}–${ev.range[1]}`}</span>` : ""}
        ${ev.trait ? `<span class="k">Scouts say</span><span>${esc(ev.trait)}</span>` : ""}
        ${ev.camp ? `<span class="k">Their camp</span><span>Found · sabotage it in Combat${ev.sabotage ? ` (-${ev.sabotage}% so far)` : ""}</span>` : ""}
        <span class="k">Reconnaissance</span><span>${reconText(ev)}</span>
      </div>
      ${ev.recon_full && ev.intel < 3 ? boostBar(ev.recon, ev.recon_full, S.favours.informant.boost, "Informant: this stretch scouts twice as fast") : ""}`;
    if (threat) {
      const strength = ev.strength ?? (ev.range ? `${ev.range[0]}–${ev.range[1]}` : "?");
      html += `<div class="vs"><div class="side"><span class="muted small">Our defence</span><b>${fmt(city.defence.total)}</b></div><span class="muted">vs</span><div class="side"><span class="muted small">Raiders</span><b>${strength}</b></div></div>`;
    }
    html += `</div>`;
  }
  html += favourSpends();
  if (ev && ["raid", "dragon"].includes(ev.kind)) html += raidPrep(ev);
  html += `<div class="section-title">Past events</div>`;
  if (!S.history.length) html += `<p class="muted">Nothing has happened yet.</p>`;
  for (const h of S.history) {
    if (!h.report) continue;
    const fight = ["raid", "dragon"].includes(h.kind);
    const tone = fight ? (h.report.title.startsWith("Victory") ? "win" : "loss")
      : { fortune: "win", hardship: "loss", minor: "loss" }[h.track] || "";
    html += `<div class="report ${tone}">
      <b>${h.report.icon || eventIcon(h.kind)} ${esc(h.report.title)}</b> <span class="muted small">${ago(h.at)}</span>
      ${fight ? `<p class="muted">Defence ${fmt(h.report.defence)} vs ${h.kind === "dragon" ? "the dragon" : "raiders"} ${fmt(h.report.attack)}${h.report.garrison.length ? ` · garrison: ${h.report.garrison.map((g) => esc(g.name)).join(", ")}` : ""}</p>` : ""}
      ${h.report.lines.map((l) => `<p>${esc(l)}</p>`).join("")}
    </div>`;
  }
  return html;
}

function favourSpends() {
  const f = S.favours, me = S.me;
  const option = (kind, icon, title, text) => {
    const o = f[kind];
    const short = !o.why && me.favour < o.cost;
    return `<div class="favour-option">
      <span class="ico">${icon}</span>
      <span class="grow"><b>${title}</b><span class="small muted">${text}</span></span>
      <span class="btns"><button class="btn sm gold" data-favour="${kind}" ${o.why || short ? "disabled" : ""}
        title="${esc(o.why || (short ? "Not enough favour" : ""))}">${FAVOUR} ${fmt(o.cost)}</button></span>
    </div>`;
  };
  return `<div class="panel"><h2>Spend favour on the city · you have ${FAVOUR} ${fmt(me.favour)}</h2>
    ${option("builders", "🏗️", "Hire a master builder", f.builders.why ? esc(f.builders.why) + "." : `×2 labour and XP for the next ${f.builders.labour}${f.builders.boost ? ` (${fmt(f.builders.boost)} left)` : ""}. Price rises per hire.`)}
    ${option("informant", "🕵️", "Pay an informant", f.informant.why ? esc(f.informant.why) + "." : `×2 recon and XP for the next ${f.informant.recon}${f.informant.boost ? ` (${fmt(f.informant.boost)} left)` : ""}. Price rises per hire.`)}
    ${option("sergeant", "📯", "Hire a drill sergeant", f.sergeant.why ? esc(f.sergeant.why) + "." : `×2 drill and XP for the next ${f.sergeant.drill}${f.sergeant.boost ? ` (${fmt(f.sergeant.boost)} left)` : ""}. Price rises per hire.`)}
  </div>`;
}

function raidPrep(ev) {
  const city = S.city, me = S.me, d = city.defence;
  const names = { mercenaries: "Hired sellswords", ward: "Divine ward (temple)", rallied: "Rallied militia (favour)", drilled: "Drilled militia", townsfolk: "Townsfolk with pitchforks", walls: "Walls", militia: "Militia (barracks)", weapons: "Swords in the armoury", shields: "Shields in the armoury", arrows: "Arrows", garrison: "Garrison" };
  const reqs = (ev.requests || []).map((r) => {
    const mine = me.bank[r.item] || 0;
    return `<div class="req"><span>${item(r.item).icon}</span><span>${esc(r.label)} <span class="muted small">${fmt(r.have)} / ${fmt(r.want)}</span></span>
      ${mine ? `<button class="btn sm gold" data-donate="${r.item}" data-qty="all">Give ${fmt(mine)}</button>` : "<span></span>"}
      <div class="bar"><span style="width:${Math.min(100, r.have / r.want * 100)}%"></span></div></div>`;
  }).join("");
  return `<div class="cols">
    <div class="panel"><h2>Council requests</h2>${reqs}
      <p class="small muted">Stockpile gear arms the defenders, best first. Fights use up arrows and break some gear.</p></div>
    <div class="panel"><h2>Defence</h2>
      <table class="parts">${Object.entries(d.parts).filter(([k, v]) => k !== "rallied" || v).map(([k, v]) => `<tr><td>${names[k]}</td><td>${fmt(v)}</td></tr>`).join("")}
      ${d.starving ? `<tr><td class="bad">Hungry (×0.8)</td><td></td></tr>` : ""}</table>
      <h2 style="margin-top:16px">Garrison</h2>
      <p class="small">${d.garrison.length ? d.garrison.map((g) => `${esc(g.name)} (${g.power})`).join(", ") : `<span class="muted">Nobody yet.</span>`}</p>
      ${me.garrison ? `<button class="btn" data-garrison="0">Leave the garrison</button>`
        : `<button class="btn primary" data-garrison="1">Stand guard (+${me.power})</button>`}
      <p class="small muted">Keep working while on guard. Victory earns favour and combat XP.</p>
    </div></div>`;
}

// --- board & roster -------------------------------------------------------

function board() {
  const msgs = S.board.map((m) => `<div class="msg"><span class="who">${esc(playerName(m.who))}</span><span class="when">${ago(m.at)}</span>
    ${m.who === S.uid && m.id ? `<button class="msg-delete" data-unpost="${m.id}" title="Delete this message">✕</button>` : ""}
    <div class="text">${esc(m.text)}</div></div>`).join("");
  const ledger = [...S.ledger].reverse().map((l) => `<li>${esc(l.text)}<span class="when">${ago(l.at)}</span></li>`).join("");
  return `<div class="cols">
    <div class="panel"><h2>Town board</h2>
      <div class="msgs">${msgs || `<p class="muted">No messages yet.</p>`}</div>
      <form data-form="board"><textarea data-keep="board" maxlength="500" placeholder="Write to the guild…"></textarea>
      <p><button class="btn primary">Post</button></p></form></div>
    <div class="panel"><h2>Town ledger</h2><ul class="ledger">${ledger || `<li class="muted">Nothing recorded yet.</li>`}</ul></div>
  </div>`;
}

function roster() {
  return `<div class="grid wide">${S.players.map((p) => {
    const cls = C.classes[p.cls];
    const levels = C.skills.filter((s) => !s.class || s.class === p.cls).map((s) => `<div class="lvl ${p.levels[s.id] <= 1 ? "low" : ""}" title="${s.name} level ${p.levels[s.id]}"><span class="ico">${s.icon}</span><span class="nm">${s.name}</span><b>${p.levels[s.id]}</b></div>`).join("");
    return `<div class="panel person"><div class="top"><span class="ico">${cls.icon}</span><div>
      <b>${esc(p.name)}</b> <span class="muted small">${cls.name} · total level ${p.total}</span>
      <div class="small">${p.doing ? `${skillOf(p.skill).icon} ${esc(p.doing)}` : `<span class="muted">Idle</span>`}${p.garrison ? ` · <span class="tag warn">On guard</span>` : ""}</div>
      <div class="small favour">${FAVOUR} ${fmt(p.donated)} given to the city</div></div></div>
      <div class="levels">${levels}</div>
      <p><button class="btn sm" data-nav="character:${esc(p.id)}">Character sheet</button></p></div>`;
  }).join("")}</div>`;
}

// --- character sheet -----------------------------------------------------

const SLOT_NAMES = { weapon: "Weapon", shield: "Shield", helmet: "Helmet", body: "Body", legs: "Legs" };

function characterSheet(uid) {
  const mine = uid === S.uid;
  const p = mine ? { ...S.players.find((x) => x.id === uid), ...S.me } : S.players.find((x) => x.id === uid);
  if (!p) return `<p class="muted">No such adventurer.</p>`;
  const cls = C.classes[p.cls];
  const skills = C.skills.filter((s) => !s.class || s.class === p.cls);
  const total = skills.reduce((sum, s) => sum + p.levels[s.id], 0);
  const days = Math.max(1, Math.ceil((serverNow() - p.joined) / 86400));
  const guard = Math.round(p.power);

  const skillRows = skills.map((s) => {
    const level = p.levels[s.id], xp = p.xp[s.id] || 0;
    const floor = C.xp_table[level], ceil = C.xp_table[level + 1];
    const pct = ceil ? (xp - floor) / (ceil - floor) * 100 : 100;
    const tool = p.equip[`tool_${s.id}`];
    const marks = (cls.fast.includes(s.id) ? `<span title="${cls.name}: ${Math.round((1 - C.class_speed) * 100)}% faster">${cls.icon}</span>` : "")
      + (tool ? `<span title="${esc(`${item(tool).name}: ${Math.round(item(tool).speed * 100)}% faster`)}">${item(tool).icon}</span>` : "");
    return `<${mine ? `button data-nav="skill:${s.id}"` : "div"} class="sheet-skill">
      <span class="ico">${s.icon}</span>
      <span class="grow"><span class="row1"><b>${s.name}</b><span class="marks">${marks}</span><span class="lv">${level}</span></span>
      <span class="bar xp"><span style="width:${pct}%"></span></span></span>
    </${mine ? "button" : "div"}>`;
  }).join("");

  return `
    <div class="panel sheet-head">
      <div class="big">${cls.icon}</div>
      <div class="grow">
        <h2>${esc(p.name)}</h2>
        <div class="muted">${cls.name} · total level ${total} · ${days === 1 ? "first day" : `${days} days`} in the city</div>
        <div class="small" style="margin-top:6px">${p.doing ? `${skillOf(p.skill).icon} ${esc(p.doing)}` : `<span class="muted">Idle</span>`}${p.garrison ? ` · <span class="tag warn">On guard</span>` : ""}</div>
      </div>
    </div>
    <div class="stats">
      <div class="stat"><div class="k">Health</div><div class="v">${fmt(p.hp)} <small>/ ${p.max_hp}</small></div><div class="bar hp" style="margin-top:6px"><span style="width:${p.hp / p.max_hp * 100}%"></span></div></div>
      <div class="stat"><div class="k">Combat power</div><div class="v">${p.power}</div><div class="note">${guard} in the garrison</div></div>
      ${mine ? `<div class="stat"><div class="k">Prayer points</div><div class="v">${fmt(p.pp)}</div><div class="note">${p.prayers.length ? p.prayers.map((id) => esc(C.prayers.find((x) => x.id === id).name)).join(", ") : "No prayers active"}</div></div>` : ""}
      <div class="stat"><div class="k">Armour</div><div class="v">${p.armour}</div><div class="note">${Math.round(p.reduction * 100)}% less physical</div></div>
      <div class="stat"><div class="k">Ward</div><div class="v">${p.ward}</div><div class="note">${Math.round(p.ward_reduction * 100)}% less magic</div></div>
      <div class="stat"><div class="k">Given to the city</div><div class="v favour">${fmt(p.donated)}</div><div class="note">${fmt(p.favour)} favour to spend</div></div>
      ${mine ? `<div class="stat"><div class="k">Purse</div><div class="v gold">${fmt(p.gold)}</div><div class="note">${p.slots_used} / ${p.slots} bank slots</div></div>` : ""}
    </div>
    <div class="cols">
      <div>
        <div class="panel"><h2>Class</h2>
          <p><b>${cls.icon} ${cls.name}</b></p>
          <p class="small">${esc(cls.bonus)}.</p>
          <p class="small">${esc(cls.masterwork)}.</p>
          <p class="small">${esc(cls.signature)}.</p>
          <p class="small">${esc(cls.combat)}.</p>
        </div>
        ${equipmentPanel(p, mine)}
      </div>
      <div class="panel"><h2>Skills</h2><div class="sheet-skills">${skillRows}</div></div>
    </div>`;
}

// The character, dressed: a compact grid of slots on a warrior's outline, Melvor-style, with
// room for slots the game doesn't have yet. A two-handed weapon fills the off hand too, faded.
// Picking a slot shows what's in it beside the grid.
const DOLL = [
  ["cape", "Cape", "cape"], ["helmet", "Head", "visored-helm"], ["amulet", "Amulet", "gem-pendant"],
  ["weapon", "Main hand", "pointy-sword"], ["body", "Body", "breastplate"], ["shield", "Off hand", "round-shield"],
  ["gloves", "Gloves", "gauntlet"], ["legs", "Legs", "leg-armor"], ["ring", "Ring", "ring"],
  ["ammo", "Ammo", "quiver"], ["boots", "Boots", "leather-boot"], ["food", "Food", "hot-meal"],
];

function dollSlot(p, slot, label, outline, picked) {
  if (slot === "food") return foodSlot(p, picked);
  const known = slot in p.equip, two = slot === "shield" && p.equip.weapon && item(p.equip.weapon).two_handed;
  const id = two ? p.equip.weapon : p.equip[slot];
  const tip = !known ? `${label}: not in the game yet` : id ? `${label}: ${item(id).name}` : `${label}: empty`;
  return `<button class="doll-slot ${known ? "" : "future"} ${id ? "" : "empty"} ${two ? "ghost" : ""} ${picked ? "on" : ""}"
      ${known ? `data-doll="${slot}"` : "disabled"} title="${esc(tip)}">
    ${id ? item(id).icon : glyph(outline, "#98a1b4")}${two ? `<span class="hands">2H</span>` : ""}
    ${slot === "weapon" && id ? `<span class="slot-type">${dmgIcon(C.styles[item(id).style || "sword"].damage)}</span>` : ""}</button>`;
}

function paperDoll(p, mine) {
  const pick = dollPick && slot2(dollPick, p);
  let slot = "";
  if (pick === "food") slot = foodPanel(p);
  else if (pick) {
    const label = DOLL.find(([s]) => s === pick)[1];
    const two = pick === "shield" && p.equip.weapon && item(p.equip.weapon).two_handed;
    const id = two ? p.equip.weapon : p.equip[pick], it = id && item(id);
    slot = `<div class="worn-head">${it ? `<span class="ico">${it.icon}</span><b>${esc(it.name)}</b>` : `<b>${label}</b><span class="muted small">empty</span>`}</div>
      ${it ? gearChips(it, p) : ""}${mine ? swapGrid(p, pick, two) : ""}`;
  }
  return `<div class="doll-wrap">
    <div class="doll"><span class="doll-figure">${glyph("swordman", "#e6e8ee")}</span>
      ${DOLL.map(([s, name, outline]) => dollSlot(p, s, name, outline, s === pick)).join("")}</div>
    <div class="doll-side"><div class="doll-slot-info">${slot}</div>${combatStats(p)}</div>
  </div>`;
}

// Your fighting numbers, always in the same place under the slot details: icons and numbers,
// with what each means on hover.
function combatStats(p) {
  const f = p.fighter, pct = (x) => `${Math.round(x * 100)}%`, dt = C.damage_types[f.damage];
  const cell = (icon, value, tip) => `<span class="gstat" title="${esc(tip)}">${icon}<span>${value}</span></span>`;
  const cells = [
    cell(glyph("biceps", "#e06a6a"), p.power, "Power: from your level and gear"),
    cell(glyph("checked-shield", "#d4dae2"), p.armour, `Armour: ${pct(p.reduction)} less damage from blows`),
    cell(glyph("magic-shield", "#a77be8"), p.ward, `Ward: ${pct(p.ward_reduction)} less damage from magic`),
    cell(glyph(dt.glyph, dt.tint), f.max_hit, `Max hit (${dt.name.toLowerCase()})`),
    cell(glyph("striking-diamonds", "#f0d060"), pct(f.crit), "Crit chance"),
    cell(glyph("stopwatch", "#9fb3c8"), `${f.interval}s`, `A swing every ${f.interval}s`),
    cell(glyph("archery-target", "#e0a050"), fmt(f.accuracy), "Accuracy"),
    cell(glyph("dodging", "#8fd0e0"), fmt(f.evasion), "Evasion"),
    cell(glyph("shield-reflect", "#e0b04a"), pct(f.block), "Block chance (with a shield)"),
  ];
  return `<div class="combat-stats"><div class="muted small">Combat stats</div><div class="stat-grid">${cells.join("")}</div></div>`;
}

// What else in the bank fits the picked slot, best first: click one to put it on. For weapons the
// corner shows the damage type, so you can pick one for what you're about to fight.
function swapGrid(p, slot, two) {
  const fits = Object.keys(p.bank).filter((id) => item(id).slot === slot)
    .sort((a, b) => (item(b).tier ?? 0) - (item(a).tier ?? 0) || (item(b).power ?? 0) - (item(a).power ?? 0));
  const tiles = fits.map((id) => {
    const it = item(id), [skill, level] = it.req || [];
    const why = two ? `Your ${item(p.equip.weapon).name.toLowerCase()} takes both hands`
      : skill && p.levels[skill] < level ? `Needs ${skillOf(skill).name.toLowerCase()} ${level}` : "";
    const corner = it.style ? dmgIcon(C.styles[it.style].damage) : "";
    const tip = [it.name, gearStats(it), it.style ? (it.two_handed ? "two-handed" : "one-handed") : "", why].filter(Boolean).join(" · ");
    return `<button class="doll-slot swap" data-equip="${id}" ${why ? "disabled" : ""} title="${esc(tip)}">${it.icon}
      ${corner ? `<span class="swap-type">${corner}</span>` : ""}${it.two_handed ? `<span class="hands">2H</span>` : ""}${p.bank[id] > 1 ? `<span class="swap-qty">${p.bank[id]}</span>` : ""}</button>`;
  });
  const off = p.equip[slot] && !two ? `<button class="doll-slot swap off" data-unequip="${slot}" title="Take it off, back to the bank">${glyph("cancel", "#98a1b4")}</button>` : "";
  if (!tiles.length && !off) return `<div class="muted small">Nothing else in your bank fits here.</div>`;
  return `<div class="swap-head muted small">Swap for</div><div class="swap-grid">${tiles.join("")}${off}</div>`;
}

// A picked slot only counts if it's one this character has.
function slot2(slot, p) {
  return slot in p.equip || (slot === "food" && "food" in p) ? slot : null;
}

// Food for fights: one you picked to eat first, or the cheapest first. Only your own sheet shows it.
function foodSlot(p, picked) {
  if (!("food" in p)) return `<span class="doll-slot future" title="Food"></span>`;
  const id = p.food && p.bank[p.food] ? p.food : null;
  const tip = id ? `Food: ${item(id).name}, heals ${item(id).heal}` : "Food: cheapest first";
  return `<button class="doll-slot ${picked ? "on" : ""} ${p.edible.length ? "" : "empty"}" data-doll="food" title="${esc(tip)}">
    ${id ? item(id).icon : glyph("two-coins", "#e0b04a")}${id ? `<span class="swap-qty">${fmt(p.bank[id])}</span>` : ""}</button>`;
}

function foodPanel(p) {
  const id = p.food && p.bank[p.food] ? p.food : null;
  const head = id ? `<div class="worn-head"><span class="ico">${item(id).icon}</span><b>${esc(item(id).name)}</b>
      <span class="muted small">${HEART} ${item(id).heal} · ${fmt(p.bank[id])} left</span></div>`
    : `<div class="worn-head"><span class="ico">${glyph("two-coins", "#e0b04a")}</span><b>Cheapest first</b></div>`;
  const tiles = [...p.edible].sort((a, b) => item(a).heal - item(b).heal).map((f) => `<button class="doll-slot swap ${f === id ? "on" : ""}" data-food="${f}"
      title="${esc(`${item(f).name}: heals ${item(f).heal}`)}">${item(f).icon}<span class="swap-qty">${fmt(p.bank[f])}</span></button>`);
  const cheap = `<button class="doll-slot swap ${id ? "" : "on"}" data-food="cheapest" title="Cheapest first">${glyph("two-coins", "#e0b04a")}</button>`;
  return head + (p.edible.length ? `<div class="swap-head muted small">Eat first</div><div class="swap-grid">${cheap}${tiles.join("")}</div>`
    : `<div class="small warn">No food in your bank.</div>`);
}

// The equipment panel, the same on the character sheet and the combat page (which leaves out tools).
function equipmentPanel(p, mine, tools = true) {
  return `<div class="panel"><h2>Equipment</h2>${paperDoll(p, mine)}
    ${tools ? `<h2 style="margin-top:16px">Tools</h2>${toolSlots(p)}` : ""}</div>`;
}

// Tools: one small slot per gathering skill.
function toolSlots(p) {
  return `<div class="tool-slots">${C.skills.filter((s) => `tool_${s.id}` in p.equip).map((s) => {
    const id = p.equip[`tool_${s.id}`], it = id && item(id);
    return `<span class="doll-slot small ${id ? "" : "empty"}" title="${esc(it ? `${it.name}: ${Math.round(it.speed * 100)}% faster ${s.name.toLowerCase()}` : `${s.name}: no tool`)}">
      ${it ? it.icon : s.icon}</span>`;
  }).join("")}</div>`;
}

// --- registration ---------------------------------------------------------

function classCards() {
  return Object.entries(C.classes).map(([id, c]) => `
    <button class="class-card ${pickedClass === id ? "on" : ""}" data-class="${id}">
      <span class="ico">${c.icon}</span><span><b>${c.name}</b><p>${esc(c.bonus)}.</p><p>${esc(c.masterwork)}.</p><p>${esc(c.signature)}.</p><p>${esc(c.combat)}.</p></span>
    </button>`).join("");
}

// After the classes became trades, everyone picks once more. Nothing is lost.
function repickPage() {
  return `<div class="welcome">
    <h2>Pick your trade</h2>
    <p class="muted">Classes are now trades, gathering through crafting. You keep every level and item. Free, once.</p>
    <div class="classes">${classCards()}</div>
    <div class="btns"><button class="btn primary" data-repick ${pickedClass ? "" : "disabled"}>Take up this trade</button></div>
    <p class="small muted">Any class can train any skill.</p>
  </div>`;
}

function register() {
  const cards = classCards();
  return `<div class="welcome">
    <h2>A new city on the frontier</h2>
    <p class="muted">Settle a frontier city together. Train, build, and hold off the bandits.
      You keep working while away, for up to a day.</p>
    <div class="classes">${cards}</div>
    <form data-form="register" class="btns">
      <input type="text" data-keep="name" maxlength="20" placeholder="Your adventurer's name" style="flex:1;min-width:200px">
      <button class="btn primary" ${pickedClass ? "" : "disabled"}>Enter the city</button>
    </form>
    <p class="small muted">Any class can train any skill.</p>
  </div>`;
}

// --- animation ------------------------------------------------------------

function animate() {
  const now = serverNow();
  const a = S?.me?.action;
  animateFight(now);
  if (a) {
    const pct = Math.min(1, (now - a.start) / a.duration);
    // In a fight the bar is the enemy's health (set by animateFight), not a timer.
    if (!a.fight) for (const el of document.querySelectorAll("[data-progress]")) el.style.width = (pct * 100) + "%";
    const key = `${a.start}:${a.duration}`;
    if (pct >= 1 && refreshedFor !== key) {
      refreshedFor = key;
      setTimeout(refresh, 150);
    } else if (a.fight && now - a.start > a.duration + (a.respawn || 1) && now - retriedAt > 2) {
      retriedAt = now;  // the next enemy hasn't turned up yet: ask again
      refresh();
    }
  }
  for (const el of document.querySelectorAll("[data-span]")) {
    const [start, end] = el.dataset.span.split(",").map(Number);
    el.style.width = Math.min(100, (now - start) / (end - start) * 100) + "%";
  }
  for (const el of document.querySelectorAll("[data-countdown]")) el.textContent = dur(Number(el.dataset.countdown) - now);
}

function loop() {
  if (S) animate();
  requestAnimationFrame(loop);
}

// --- events ---------------------------------------------------------------

document.addEventListener("click", (e) => {
  const t = e.target.closest("button, [data-menu], [data-close]");
  if (!t) return;
  const d = t.dataset;
  if (t.matches("[data-battle-skip]")) return playBattle.finish?.();
  if (d.raidSeen) {
    $("#modal").hidden = true;
    return act("/api/seen", { id: Number(d.raidSeen) });
  }
  if (!$("#modal").hidden && $(".battle")) return;  // the raid report closes with its own button, once watched
  if (t.matches("[data-close]") || e.target === $("#modal")) { $("#modal").hidden = true; showThreat(); return; }
  if ("menu" in d) { setMenu(!$("#app").classList.contains("open")); return; }
  if (d.nav) {
    page = d.nav; remember("page", page); selected = null;
    history.replaceState(null, "", "#" + page);
    setMenu(false);
    render(); window.scrollTo(0, 0); return;
  }
  if (d.start) return act("/api/action", { id: d.start });
  if (d.once) return act("/api/action", { id: d.once, once: true });
  if ("stop" in d) return act("/api/stop", {});
  if (d.doll) {
    dollPick = dollPick === d.doll ? null : d.doll;
    return render();
  }
  if ("select" in d) {
    selected = d.select || null;
    render();
    // On a phone the item panel sits under the bank grid: bring it into view.
    if (selected && matchMedia("(max-width: 900px)").matches) $(".item-panel")?.scrollIntoView({ behavior: "smooth", block: "start" });
    return;
  }
  const qty = d.qty === "all" ? "all" : Number(d.qty);
  if (d.donate) return act("/api/donate", { item: d.donate, qty });
  if (d.sell) return act("/api/sell", { item: d.sell, qty });
  if (d.give) return act("/api/give", { item: d.give, qty, to: $("[data-keep=give-to]").value });
  if (d.equip) return act("/api/equip", { item: d.equip });
  if (d.unequip) return act("/api/equip", { slot: d.unequip });
  if (d.fund) return act("/api/fund", { building: d.fund, item: d.item, source: d.source, qty: "all" });
  if (d.install) return act("/api/install", { fitting: d.install, source: d.source });
  if ("plot" in d) return act("/api/plot", { id: d.plot || null });
  if (d.garrison) return act("/api/garrison", { join: d.garrison === "1" });
  if (d.perk) return act("/api/perk", { perk: d.perk });
  if (d.favour) return act("/api/favour", { kind: d.favour });
  if (d.food) return act("/api/food", { item: d.food === "cheapest" ? null : d.food });
  if (d.potion) return act("/api/potion", { item: d.potion });
  if (d.unpost) {
    if (!confirm("Delete this message?")) return;
    return act("/api/board/delete", { id: Number(d.unpost) });
  }
  if (d.aid) return act("/api/aid", { kind: d.aid, item: d.item, source: d.source });
  if ("hire" in d) return act("/api/hire", {});
  if (d.devHappen) return act("/api/dev/happen", { track: d.devHappen });
  if (d.pray) {
    const on = S.me.prayers.includes(d.pray);
    if (!on && S.me.prayers.length >= C.max_prayers) return toast(`Max ${C.max_prayers} prayers active`, "bad");
    return act("/api/prayers", { ids: on ? S.me.prayers.filter((x) => x !== d.pray) : [...S.me.prayers, d.pray] });
  }
  if (d.overflow) return act("/api/settings", { overflow: d.overflow });
  if (d.class) { pickedClass = d.class; render(); return; }
  if ("repick" in d) return act("/api/class", { cls: pickedClass });
  if (d.tab) { tabs[d.tab] = d.group; remember(`tab.${d.tab}`, d.group); render(); return; }
  if (d.devAdvance) return act("/api/dev/advance", { hours: Number(d.devAdvance) });
  if ("devEvent" in d) return act("/api/dev/event", {});
});

document.addEventListener("change", (e) => {
});

$("#modal").addEventListener("click", (e) => { if (e.target.id === "modal") e.target.hidden = true; });

document.addEventListener("submit", async (e) => {
  const form = e.target.closest("[data-form]");
  if (!form) return;
  e.preventDefault();
  const field = form.querySelector("[data-keep]");
  const value = field.value.trim();
  if (form.dataset.form === "register") {
    if (!pickedClass) return toast("Pick a class first", "bad");
    return act("/api/register", { name: value, cls: pickedClass });
  }
  if (form.dataset.form === "board") {
    if (!value) return;
    field.value = "";
    return act("/api/board", { text: value });
  }
  if (form.dataset.form === "gold") {
    field.value = "";
    return act("/api/donate", { item: "gold", qty: Number(value) });
  }
  if (form.dataset.form === "dev-user" && value) {
    document.cookie = `gh_user=${encodeURIComponent(value)}; path=/; SameSite=Lax`;
    field.value = "";
    return refresh();
  }
});

document.addEventListener("visibilitychange", () => { if (!document.hidden) refresh(); });

// --- swipe the menu open and shut (phones) --------------------------------
// A mostly-sideways swipe drags the drawer with the finger; letting go snaps
// it open or shut by distance or speed. Vertical scrolling is left alone.
// Move and end listeners go on the touched element itself: touch events keep
// going to it even if a re-render detaches it mid-swipe, and then they no
// longer bubble up to the document.

(function swipeMenu() {
  const phone = matchMedia("(max-width: 900px)");
  let drag = null;

  const reset = () => {
    $("#side").style.transform = $("#side").style.transition = "";
    $("#scrim").style.opacity = "";
    $("#app").classList.remove("dragging");
  };

  document.addEventListener("touchstart", (e) => {
    if (drag) release();
    if (!phone.matches || e.touches.length !== 1 || !$("#modal").hidden || e.target.closest("input, textarea, select")) return;
    const t = e.touches[0];
    drag = { x: t.clientX, y: t.clientY, at: e.timeStamp, open: $("#app").classList.contains("open"), axis: null, dx: 0, target: e.target };
    drag.target.addEventListener("touchmove", move, { passive: false });
    drag.target.addEventListener("touchend", finish);
    drag.target.addEventListener("touchcancel", finish);
  }, { passive: true });

  function release() {
    drag.target.removeEventListener("touchmove", move);
    drag.target.removeEventListener("touchend", finish);
    drag.target.removeEventListener("touchcancel", finish);
    if (drag.axis === "x") reset();
    drag = null;
  }

  function move(e) {
    if (!drag) return;
    const t = e.touches[0];
    const dx = t.clientX - drag.x, dy = t.clientY - drag.y;
    if (!drag.axis) {
      if (Math.hypot(dx, dy) < 10) return;
      const sideways = Math.abs(dx) > Math.abs(dy) * 1.3 && (drag.open ? dx < 0 : dx > 0);
      drag.axis = sideways ? "x" : "y";
      if (!sideways) return;
      drag.width = $("#side").offsetWidth;
      $("#side").style.transition = "none";
      $("#app").classList.add("dragging");
    }
    if (drag.axis !== "x") return;
    e.preventDefault();
    drag.dx = dx;
    // 0 is fully open, -width fully shut.
    const offset = Math.max(-drag.width, Math.min(0, drag.open ? dx : dx - drag.width));
    $("#side").style.transform = `translateX(${offset}px)`;
    $("#scrim").style.opacity = String(1 + offset / drag.width);
  }

  function finish(e) {
    if (!drag) return;
    const swiped = drag.axis === "x";
    const speed = drag.dx / Math.max(1, e.timeStamp - drag.at);  // px per ms
    const open = drag.open
      ? !(drag.dx < -drag.width * 0.35 || speed < -0.4)
      : drag.dx > drag.width * 0.35 || speed > 0.4;
    // Hand back to the stylesheet; its transition carries on from here.
    release();
    if (swiped) setMenu(open);
  }
})();

(async function boot() {
  try {
    C = iconise(await api("/api/content"));
    await refresh();
  } catch (err) {
    $("#main").innerHTML = `<p class="loading">Couldn't reach the city: ${esc(err.message)}</p>`;
    return;
  }
  setInterval(() => { if (!document.hidden) refresh(); }, POLL_MS);
  requestAnimationFrame(loop);
})();