{ pkgs, lib, config, ... }:

let mod = "Mod4";
    cfg = config.custom.gui;

    # Generate the workspace keybinds
    genWorkspaces = { numbered, named }: with lib; (
      let nums = genAttrs (map toString (range 1 (min numbered 9))) id;
          genBindings = (num: key: {
            "${mod}+${key}"       = "workspace ${num}";
            "${mod}+Shift+${key}" = "move window to workspace ${num}";
          });
          keybinds = mapAttrsToList genBindings (nums // named);
       in mkMerge keybinds
    );

    sc = with pkgs; (writeScriptBin "sc" ''
      ${slurp}/bin/slurp | ${grim}/bin/grim -g - - | ${wl-clipboard}/bin/wl-copy -t image/png
    '');

    vol = ../../../script/vol;

in with lib; {

  options.custom.gui.wm = with types; {
    workspaces.named = mkOption {
      type = attrsOf str;
      default = {};
    };
    workspaces.numbered = mkOption {
      type = int;
      default = 8;
    };
  };

  config = mkIf (cfg.enable) {

    home.packages = with pkgs; [
      kitty
      wl-clipboard
      sc
      (writeScriptBin "c" ''
        ${wl-clipboard}/bin/wl-copy
      '')
      (writeScriptBin "p" ''
        ${wl-clipboard}/bin/wl-paste
      '')
    ];

    services.unclutter.enable = true;

    wayland.windowManager.sway = {
      # This is all required to get it to not die.
      enable = true;
      wrapperFeatures.gtk = true;
      extraSessionCommands = ''
        export WLR_NO_HARDWARE_CURSORS=1;
        export WLR_RENDERER=vulkan;
        export WLR_EGL_NO_MODIFIERS=1;
      '';
      extraOptions = [ "--unsupported-gpu" ];
      systemdIntegration = true;

      extraConfig = ''
        bindsym --release ${mod}+d exec ${sc}/bin/sc
      '';

      config = rec {
        output."*".bg = "${../../data/wallpaper.jpg} fill";
        input."type:keyboard".xkb_options = "caps:escape";

        terminal = "kitty --single-instance";
        bars = [];

        gaps = {
          inner = 4;
          outer = 2;
        };

        colors = {
          focused = rec {
            text        = "#ffffff";
            border      = "#7c56c4";
            background  = border;
            childBorder = border;
            indicator   = border;
          };
        };

        # Directional keys
        modifier = mod;
        fonts = {
          names = [ "Fira Code" ];
          size = 8.0;
        };

        keybindings = let
          mpc = "${pkgs.mpc-cli}/bin/mpc";
        in mkMerge [
          (genWorkspaces { inherit (cfg.wm.workspaces) numbered named; })
          {
            "${mod}+h" = "focus left";
            "${mod}+j" = "focus down";
            "${mod}+k" = "focus up";
            "${mod}+l" = "focus right";

            "${mod}+semicolon"   = "workspace prev_on_output";
            "${mod}+apostrophe"  = "workspace next_on_output";

            "${mod}+Shift+h" = "move left";
            "${mod}+Shift+j" = "move down";
            "${mod}+Shift+k" = "move up";
            "${mod}+Shift+l" = "move right";

            "${mod}+a" = "split v";
            "${mod}+s" = "split h";
            "${mod}+f" = "fullscreen toggle";

            "${mod}+Alt+a" = "layout toggle stacking splitv";
            "${mod}+Alt+s" = "layout toggle tabbed splith";

            "${mod}+Escape"     = "exec swaylock";

            "${mod}+Return"     = "exec ${terminal}";
            "${mod}+Alt+Return" = "exec ${pkgs.foot}/bin/foot";
            "${mod}+Tab"        = "exec ${pkgs.firefox-wayland}/bin/firefox";
            "${mod}+Alt+Tab"    = "exec ${pkgs.google-chrome}/bin/google-chrome-stable --ozone-platform-hint=auto --enable-features=VaapiVideoDecoder,VaapiVideoEncoder";

            "${mod}+Backspace" = "mode kill";

            "XF86AudioRaiseVolume" = "exec ${vol} raise";
            "XF86AudioLowerVolume" = "exec ${vol} lower";
            "XF86AudioMute"        = "exec ${vol} toggle";
            "XF86AudioPlay"        = "exec ${mpc} toggle";

            "${mod}+comma"  = "exec ${mpc} prev";
            "${mod}+period" = "exec ${mpc} next";
            "${mod}+slash"  = "exec ${mpc} toggle";
          }
        ];

        modes."kill" = {
          Backspace = "kill; mode default";
          Escape    = "mode default";
        };

        window.titlebar = false;
      };
    };

  };

}