# home-manager/fred.nix
{ config, pkgs, lib, inputs, osConfig, ... }:
let
  isDesktop = lib.elem osConfig.networking.hostName [ "FredOS-Gaming" "FredOS-Macbook" ];
in
{
  home.stateVersion = "25.11";

  home.packages = with pkgs; [
    #
  ];

  home.file.".config/nixpkgs/config.nix".text = ''
    { allowUnfree = true; }
  '';

  # Wallpaper source — consumed by stylix's image option (set in
  # settings/stylix.nix) and by quickshell's wallpaper layer.
  home.file.".local/share/backgrounds/wallpaper.png".source =
    "${inputs.self}/walls/wallpaper.png";

  # btop — stylix's btop target writes the colour theme; we keep our
  # non-colour preferences here.
  programs.btop = {
    enable = true;
    settings = {
      theme_background = false;
      vim_keys = false;
      proc_filter_kernel = true;
    };
  };

  # Ghostty — stylix's ghostty target writes the colour theme.
  programs.ghostty = lib.mkIf isDesktop {
    enable = true;
    settings = {
      font-family = "CaskaydiaCove NF";
      font-size = 11;
      font-thicken = true;
      window-padding-x = 10;
      window-padding-y = 10;
      window-padding-balance = true;
      background-opacity = 0.98;
      confirm-close-surface = false;
      gtk-titlebar = false;
      gtk-single-instance = true;
      # keeps the warm instance alive with zero windows
      quit-after-last-window-closed = false;
      cursor-style = "bar";
      cursor-style-blink = true;
    };
  };

  # spotify-player — native librespot TUI replacing the Electron Spotify app.
  # stylix's spotify-player target writes the colour theme.
  # MPRIS (quickshell's media card), notifications and streaming are all on by
  # default on Linux, so only the off-by-default visualiser needs setting.
  programs.spotify-player = lib.mkIf isDesktop {
    enable = true;
    # 26.05 ships 0.23.0, whose Web API token is cached with refresh_token =
    # null: once it expires (~1h) nothing can renew it and the library just
    # spins until the app is restarted. 0.24.1 treats a non-renewable cached
    # token as unusable and re-runs the PKCE flow instead. Drop this override
    # once the pinned channel reaches 0.24.1.
    package = pkgs.spotify-player.overrideAttrs (old: rec {
      version = "0.24.1";
      src = pkgs.fetchFromGitHub {
        owner = "aome510";
        repo = "spotify-player";
        tag = "v${version}";
        hash = "sha256-+GADmRl4XMwV8TfYZjEeyKDDfda3bDPzeerhYryX6vA=";
      };
      cargoDeps = pkgs.rustPlatform.fetchCargoVendor {
        inherit src;
        hash = "sha256-CSZ5sZ+d7Jhi43ipaWXKupYPFgWCbCx4RMTQN8emu9o=";
      };
      # Give initialize_playback's retry loop a much longer window, so we don't
      # have to pick our own device from the popup on every launch. Upstream
      # retries the transfer 5 times, once a second; our librespot device isn't
      # registered with the Spotify backend until ~20s after startup, so all
      # five attempts 404 and it gives up:
      #   Trying to connect to device (id=…)
      #   Connection failed (device_id=…): http error: status code 404 Not Found
      # The loop breaks on the first success, so a bigger bound costs nothing.
      # The CLI is no help here: `connect --name` resolves names against the Web
      # API device list, which doesn't contain the integrated device at all.
      #
      # Widen it by slowing the delay rather than by adding rounds: each round
      # costs up to three Web API calls, and we now share the bundled client ID
      # with every other spotify-player/ncspot user, so 60 one-second rounds was
      # ~180 requests per launch into a shared rate-limit bucket (429s). 12
      # rounds five seconds apart covers the same 60s for a fifth of the calls.
      # Both loops in this file are `for _ in 0..5` / `from_secs(1)`; the leading
      # indentation is what pins each replacement to the intended one.
      #
      # The third replacement hits the other loop, in retry_playback_state: it
      # re-reads the playback state five times after *every* playback-changing
      # action, so one flick of the volume wheel costs a write plus five reads
      # per notch. The state is updated optimistically client-side anyway, so
      # two confirmations are plenty.
      postPatch = (old.postPatch or "") + ''
        substituteInPlace spotify_player/src/client/mod.rs \
          --replace-fail "                for _ in 0..5 {" \
                         "                for _ in 0..12 {" \
          --replace-fail "                let delay = std::time::Duration::from_secs(1);" \
                         "                let delay = std::time::Duration::from_secs(5);" \
          --replace-fail "            for _ in 0..5 {" \
                         "            for _ in 0..2 {"
      '';
    });
    settings = {
      enable_audio_visualization = true;
      # Our own Spotify app rather than the bundled default (ncspot's client ID,
      # shared by every spotify-player/ncspot install). Upstream recommends the
      # default because it has extended quota mode, but its rate-limit bucket is
      # shared across every user of it, and we hit 429s on it just adjusting the
      # volume. Our own app gets a private bucket.
      #
      # The cost of a post-2024-11-27 app is restricted quota: Spotify returns
      # its own editorial/algorithmic playlists as null, so Discover Weekly,
      # Made-For-You and browse categories are missing. That used to break
      # *search* outright (upstream #617/#621) because one null sank the whole
      # deserialization, but rspotify 0.15.3 — pinned by 0.24.1 — drops null
      # page items instead (`vec_without_nulls`), so search works again.
      # Public PKCE client, no secret involved, so it's fine in the repo.
      # Redirect URI registered: http://127.0.0.1:8989/login
      client_id = "265506bc7bbd4032bf0fee708b321d3e";
      # Each notch fires a volume write plus a burst of confirmation polls, so
      # halve the notches needed to cross the range.
      volume_scroll_step = 10;
    };
    # The home-manager module only writes keymap.toml when `keymaps` is
    # non-empty, so `actions` alone would silently emit nothing. Restating a
    # default binding is the cheapest way to make the file exist.
    keymaps = [
      {
        command = "ShowActionsOnCurrentTrack";
        key_sequence = "a";
      }
    ];
    # Actions default to the *selected* item, which is useless when listening
    # along to someone else's playback — the track was never selected, so
    # liking it means finding it by hand. target = "PlayingTrack" acts on
    # whatever is actually playing.
    actions = [
      {
        action = "ToggleLiked";
        key_sequence = "L";
        target = "PlayingTrack";
      }
      {
        action = "GoToArtist";
        key_sequence = "g P";
        target = "PlayingTrack";
      }
      {
        action = "GoToAlbum";
        key_sequence = "g B";
        target = "PlayingTrack";
      }
    ];
  };

  # Upstream ships no .desktop file (TUI only), so the launcher can't find it.
  xdg.desktopEntries.spotify-player = lib.mkIf isDesktop {
    name = "Spotify Player";
    genericName = "Music Player";
    exec = "ghostty --title=spotify-player -e spotify_player";
    icon = "spotify";
    terminal = false;
    categories = [ "Audio" "Music" "Player" "AudioVideo" ];
  };

  # Warm Ghostty instance — new windows attach via gtk-single-instance.
  systemd.user.services.ghostty-daemon = lib.mkIf isDesktop {
    Unit = {
      Description = "Ghostty warm instance (no window)";
      After = [ "graphical-session.target" ];
      PartOf = [ "graphical-session.target" ];
    };
    Service = {
      Type = "simple";
      ExecStart = "${pkgs.ghostty}/bin/ghostty --initial-window=false";
      Restart = "always";
    };
    Install.WantedBy = [ "graphical-session.target" ];
  };

}