# settings/hyprland.nix
{ config, pkgs, lib, inputs, ... }:
{
  config = lib.mkIf (config.networking.hostName == "FredOS-Gaming") {
    programs.hyprland = {
      enable = true;
      xwayland.enable = true;
      # Pin to upstream Hyprland flake — 25.11's nixpkgs only has 0.52.1
      # and the resize-lag fix landed in 0.52.2.
      package      = inputs.hyprland.packages.${pkgs.stdenv.hostPlatform.system}.hyprland;
      portalPackage = inputs.hyprland.packages.${pkgs.stdenv.hostPlatform.system}.xdg-desktop-portal-hyprland;
    };

    xdg.portal = {
      enable = true;
      # xdg-desktop-portal-hyprland is registered automatically by
      # programs.hyprland.portalPackage; listing it here too produced a
      # duplicate user-unit symlink during nixos-rebuild.
      extraPortals = with pkgs; [
        xdg-desktop-portal-gtk
      ];
      config.hyprland.default = [ "hyprland" "gtk" ];
    };

    security.polkit.enable = true;

    # Polkit GUI agent for GUI sudo prompts under Hyprland
    systemd.user.services.polkit-gnome-authentication-agent-1 = {
      description = "polkit-gnome-authentication-agent-1";
      wantedBy = [ "graphical-session.target" ];
      partOf = [ "graphical-session.target" ];
      after = [ "graphical-session.target" ];
      serviceConfig = {
        Type = "simple";
        ExecStart = "${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1";
        Restart = "on-failure";
      };
    };

    environment.systemPackages = with pkgs; [
      ghostty
      mako
      grim
      slurp
      wl-clipboard
      cliphist
      brightnessctl
      pamixer
      playerctl
      hyprpaper
      hyprlock
      hypridle
      hyprshot
      networkmanagerapplet
      pavucontrol
      polkit_gnome
    ];

    home-manager.users.fred = { config, lib, pkgs, inputs, ... }: {
      wayland.windowManager.hyprland = {
        enable = true;
        systemd.variables = [ "--all" ];
        package = inputs.hyprland.packages.${pkgs.stdenv.hostPlatform.system}.hyprland;

        settings = {
          # Use the EDID-native 180 Hz mode. 190 Hz is technically faster
          # but the OC mode doesn't advertise FreeSync — at 180 Hz we get
          # working VRR, which usually beats the +10 Hz on perceived
          # smoothness.
          monitor = "DP-2,3440x1440@180,0x0,1";

          # FredOS-Gaming has both a Ryzen iGPU (card0, 1002:164E) and a
          # Navi 22 dGPU (card1, 1002:73DF). Force aquamarine + clients onto
          # the dGPU so we don't pay PRIME-copy latency every frame.
          env = [
            "AQ_DRM_DEVICES,/dev/dri/card1"
            "WLR_DRM_DEVICES,/dev/dri/card1"
            "DRI_PRIME,pci-0000_03_00_0"
            # Keep these in sync with stylix.cursor in settings/stylix.nix.
            "XCURSOR_THEME,Bibata-Modern-Ice"
            "XCURSOR_SIZE,24"
            "HYPRCURSOR_THEME,Bibata-Modern-Ice"
            "HYPRCURSOR_SIZE,24"

            # Prefer native Wayland backends where the app supports it.
            "ELECTRON_OZONE_PLATFORM_HINT,wayland"  # Vesktop, VSCodium
            "MOZ_ENABLE_WAYLAND,1"                  # Zen / Firefox family
            "QT_QPA_PLATFORM,wayland;xcb"           # Qt apps, XWayland fallback
            "SDL_VIDEODRIVER,wayland"               # SDL apps
            "_JAVA_AWT_WM_NONREPARENTING,1"         # Java tiling fix
          ];

          "$mod"  = "SUPER";
          "$term" = "ghostty";
          "$menu" = "fuzzel";

          exec-once = [
            # waybar starts via its systemd user service — see programs.waybar
            # below — so it waits for graphical-session.target instead of
            # racing the Wayland init.
            "mako"
            "hyprpaper"
            "nm-applet --indicator"
            "wl-paste --type text  --watch cliphist store"
            "wl-paste --type image --watch cliphist store"
            "hyprctl setcursor Bibata-Modern-Ice 24"
          ];

          general = {
            gaps_in = 6;
            gaps_out = 12;
            border_size = 2;
            layout = "dwindle";
            resize_on_border = true;
          };

          decoration = {
            rounding = 8;
            # Blur disabled — two passes at 3440x1440 was the biggest
            # contributor to per-frame compositor latency. Re-enable with
            # smaller size/passes if you miss the look.
            blur = {
              enabled = true;
            };
          };

          render = {
            direct_scanout = true; # fullscreen apps bypass compositor
          };

          animations = {
            enabled = true;
            # speed = tenths of a second; 1 = 0.1s ≈ instant.
            bezier = [
              "snap, 0.05, 0.9, 0.1, 1.0"
            ];
            animation = [
              "windows,     1, 1, snap"
              "windowsOut,  1, 1, snap, popin 80%"
              "border,      1, 2, default"
              "fade,        1, 1, default"
              "workspaces,  1, 1, snap"
            ];
          };

          input = {
            kb_layout = "gb,no";
            kb_options = "grp:alt_shift_toggle";
            follow_mouse = 1;
            accel_profile = "flat";
            sensitivity = 0;
          };

          cursor = {
            no_warps = true; # don't teleport the cursor on focus changes
          };

          dwindle = {
            preserve_split = true;
            # New windows split the focused container 50/50 — your usual
            # 2-way layout falls out of dwindle's defaults.
          };

          misc = {
            disable_hyprland_logo = true;
            disable_splash_rendering = true;
            # Apps demanding attention don't get to yank focus — they'll
            # show as urgent in the bar instead. Pairs with cursor.no_warps
            # below; without that, focus jumps drag the cursor with them.
            focus_on_activate = false;
            vrr = 2; # always on — should engage at the 180 Hz EDID mode
          };

          # vfr moved from misc: to debug: in 0.55.0
          debug = {
            vfr = false; # keep compositor ticking, don't idle between frames
          };

          # Mirror the GNOME bindings so muscle memory carries over
          bind = [
            "$mod, T, exec, $term"
            "$mod, E, exec, nautilus"
            "$mod, R, exec, $menu"
            "$mod, Q, killactive"
            "$mod SHIFT, E, exit"

            # Floating / layout
            "$mod, V, togglefloating"
            "$mod, F, fullscreen, 0"
            "$mod, P, pseudo"
            "$mod, S, layoutmsg, togglesplit"


            # Focus
            "$mod, left,  movefocus, l"
            "$mod, right, movefocus, r"
            "$mod, up,    movefocus, u"
            "$mod, down,  movefocus, d"
            "$mod, H,     movefocus, l"
            "$mod, K,     movefocus, u"
            "$mod, J,     movefocus, d"
            # L freed for hyprlock — arrow keys still handle right-focus.

            # Lock screen
            "$mod, L, exec, hyprlock"

            # Move windows
            "$mod SHIFT, left,  movewindow, l"
            "$mod SHIFT, right, movewindow, r"
            "$mod SHIFT, up,    movewindow, u"
            "$mod SHIFT, down,  movewindow, d"

            # Workspaces
            "$mod, 1, workspace, 1"
            "$mod, 2, workspace, 2"
            "$mod, 3, workspace, 3"
            "$mod, 4, workspace, 4"
            "$mod, 5, workspace, 5"
            "$mod, 6, workspace, 6"
            "$mod, 7, workspace, 7"
            "$mod, 8, workspace, 8"
            "$mod, 9, workspace, 9"
            "$mod, 0, workspace, 10"

            "$mod SHIFT, 1, movetoworkspacesilent, 1"
            "$mod SHIFT, 2, movetoworkspacesilent, 2"
            "$mod SHIFT, 3, movetoworkspacesilent, 3"
            "$mod SHIFT, 4, movetoworkspacesilent, 4"
            "$mod SHIFT, 5, movetoworkspacesilent, 5"
            "$mod SHIFT, 6, movetoworkspacesilent, 6"
            "$mod SHIFT, 7, movetoworkspacesilent, 7"
            "$mod SHIFT, 8, movetoworkspacesilent, 8"
            "$mod SHIFT, 9, movetoworkspacesilent, 9"
            "$mod SHIFT, 0, movetoworkspacesilent, 10"

            # Screenshots — Shift+Super+S matches your GNOME binding
            "$mod SHIFT, S, exec, hyprshot -m region --clipboard-only"
            ", Print,      exec, hyprshot -m output --clipboard-only"

            # Settings shortcut — Super+I matches your GNOME binding
            "$mod, I, exec, pavucontrol"
          ];

          bindm = [
            "$mod, mouse:272, movewindow"
            "$mod, mouse:273, resizewindow"
          ];

          bindel = [
            ", XF86AudioRaiseVolume, exec, pamixer -i 5"
            ", XF86AudioLowerVolume, exec, pamixer -d 5"
            ", XF86AudioMute,        exec, pamixer -t"
            ", XF86MonBrightnessUp,   exec, brightnessctl set 5%+"
            ", XF86MonBrightnessDown, exec, brightnessctl set 5%-"
          ];

          bindl = [
            ", XF86AudioPlay, exec, playerctl play-pause"
            ", XF86AudioNext, exec, playerctl next"
            ", XF86AudioPrev, exec, playerctl previous"
          ];
        };
      };

      programs.fuzzel = {
        enable = true;
        settings = {
          # Font + colors now come from stylix.targets.fuzzel.
          main = {
            lines = 8;
            width = 64;
            horizontal-pad = 24
            vertical-pad = 24;
            inner-pad = 16;
            icon-theme = "Adwaita";
            terminal = "ghostty";
            prompt = "\"  \"";
          };
          border = {
            width = 1;
            radius = 10;
          };
          dmenu = {
            exit-immediately-if-empty = "yes";
          };
        };
      };

      programs.waybar = {
        enable = true;
        systemd.enable = true; # start via graphical-session.target

        settings.mainBar = {
          layer = "top";
          position = "top";
          height = 30;
          spacing = 6;

          modules-left   = [ "hyprland/workspaces" ];
          modules-center = [ "clock" ];
          modules-right  = [ "pulseaudio" "network" "tray" "custom/power" ];

          "hyprland/workspaces" = {
            format = "{name}";
            on-click = "activate";
            sort-by-number = true;
          };

          clock = {
            format = "{:%H:%M}";
            tooltip-format = "<big>{:%A, %d %B %Y}</big>\n<tt><small>{calendar}</small></tt>";
          };

          pulseaudio = {
            format = "{icon} {volume}%";
            format-muted = "  muted";
            format-icons = {
              default = [ "" "" "" ];
              headphone = "";
              headset = "";
            };
            on-click = "pavucontrol";
            scroll-step = 5;
          };

          network = {
            format-wifi = "󰖩  {essid}";
            format-ethernet = "󰈀";
            format-disconnected = "󰖪";
            tooltip-format = "{ifname}";
            on-click = "nm-connection-editor";
          };

          tray = {
            icon-size = 16;
            spacing = 8;
          };

          "custom/power" = {
            format = "⏻";
            tooltip = false;
            on-click = "${pkgs.writeShellScript "power-menu" ''
              choice=$(printf "Lock\nLogout\nReboot\nShutdown" \
                | ${pkgs.fuzzel}/bin/fuzzel --dmenu --prompt="Power: " --lines=4 --width=12)
              case "$choice" in
                Lock)     ${pkgs.hyprlock}/bin/hyprlock ;;
                Logout)   hyprctl dispatch exit ;;
                Reboot)   systemctl reboot ;;
                Shutdown) systemctl poweroff ;;
              esac
            ''}";
          };
        };

        # Colour tokens (@base00..@base0F) are injected by stylix's waybar
        # target. We reference them instead of hardcoded hex so the bar
        # follows the wallpaper-derived palette.
        style = ''
          * {
            font-family: "FiraMono Nerd Font", monospace;
            font-size: 13px;
            min-height: 0;
            border: none;
            border-radius: 0;
          }

          window#waybar {
            background: alpha(@base00, 0.82);
            color: @base05;
          }

          #workspaces {
            margin-left: 6px;
          }

          #workspaces button {
            padding: 0 8px;
            color: @base03;
            background: transparent;
          }

          #workspaces button.active {
            color: @base05;
          }

          #workspaces button:hover {
            background: alpha(@base05, 0.08);
            color: @base05;
            box-shadow: none;
            text-shadow: none;
          }

          #clock {
            color: @base05;
            font-weight: 500;
          }

          #pulseaudio,
          #network,
          #tray,
          #custom-power {
            padding: 0 10px;
            color: @base05;
          }

          #pulseaudio.muted,
          #network.disconnected {
            color: @base03;
          }

          #custom-power:hover {
            color: @base08;
          }

          #custom-power {
            margin-right: 6px;
          }

          #tray {
            margin-right: 0;
          }
        '';
      };
    };
  };
}