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

let
  cfg = config.samfelag.modules.desktop.i3;
  mod = "Mod4";
in {

  options.samfelag.modules.desktop.i3 = with lib; {
    enable = mkEnableOption "i3 window manager";

    mod = my.mkOpt' types.str "Mod4" "Main modifier key for i3";

    laptop = mkEnableOption "Enable features for a laptop (trackpad, battery, etc...)";

    extraKeybindings = my.mkOpt (types.attrsOf types.str) {};
    extraStartup = my.mkOpt (types.listOf types.attrs) [ ];

  };

  config = lib.mkIf cfg.enable {

    # - Dependencies -----------------------------

    environment.systemPackages = with pkgs; [
      (nerdfonts.override { fonts = [ "Iosevka" ]; })
      playerctl
    ];

    services.xserver = {
      enable = true;

      libinput = lib.mkIf cfg.laptop {
        enable = true;
        touchpad.tapping = true;
      };

      desktopManager = {
        xterm.enable = false;
      };

      displayManager = {
        defaultSession = "none+i3";
        lightdm = {
          enable = true;
          greeters.mini = {
            enable = true;
            user = "marc";
            extraConfig = ''
                [greeter]
                show-sys-info = true
            '';
          };
        };
      };

      windowManager.i3.enable = true;
    };

    # - Configuration ----------------------------

    hm.xsession.windowManager.i3 = {
      enable = true;

      config = {
        modifier = mod;

        fonts = {
          names =  ["DejaVu Sans Mono" "Iosevka Nerd Font"];
          style = "regular";
          size = 12.0;
        };

        focus.followMouse = false;

        bars = [ ];

        window = {
          border = 1;
          titlebar = false;
        };

        # gaps = {
        #   inner = 10;
        #   outer = 5;
        # };

        startup = [
          { command = "i3-msg workspace 1"; }
        ] ++ cfg.extraStartup;

        modes = {
          "resize" = {
            "h" = "resize shrink width 10 px or 10 ppt";
            "j" = "resize grow height 10 px or 10 ppt";
            "k" = "resize shrink height 10 px or 10 ppt";
            "l" = "resize grow width 10 px or 10 ppt";

            "Left"  = "resize shrink width 10 px or 10 ppt";
            "Down"  = "resize grow height 10 px or 10 ppt";
            "Up"    = "resize shrink height 10 px or 10 ppt";
            "Right" = "resize grow width 10 px or 10 ppt";

            "Return" = "mode \"default\"";
            "Escape" = "mode \"default\"";
          };
        };

        keybindings = {
          "${mod}+q" = "kill";

          # Focus
          "${mod}+h" = "focus left";
          "${mod}+j" = "focus down";
          "${mod}+k" = "focus up";
          "${mod}+l" = "focus right";
          "${mod}+Left" = "focus left";
          "${mod}+Down" = "focus down";
          "${mod}+Up" = "focus up";
          "${mod}+Right" = "focus right";

          # Move
          "${mod}+Shift+h" = "move left";
          "${mod}+Shift+j" = "move down";
          "${mod}+Shift+k" = "move up";
          "${mod}+Shift+l" = "move right";
          "${mod}+Shift+Left" = "move left";
          "${mod}+Shift+Down" = "move down";
          "${mod}+Shift+Up" = "move up";
          "${mod}+Shift+Right" = "move right";

          # split orientation
          "${mod}+z" = "split h;exec notify-send 'tile horizontally'";
          "${mod}+v" = "split v;exec notify-send 'tile vertically'";

          # enter fullscreen mode for the focused container
          "${mod}+f" = "fullscreen toggle";

          # change container layout (stacked, tabbed, toggle split)
          "${mod}+s" = "layout stacking";
          "${mod}+w" = "layout tabbed";
          "${mod}+e" = "layout toggle split";

          # toggle tiling / floating
          "${mod}+Shift+space" = "floating toggle";

          # focus the parent container
          "${mod}+a" = "focus parent";

          # Reload config + restart i3
          "${mod}+Shift+c" = "reload";
          "${mod}+Shift+r" = "restart";

          # - Modes ------------------------------
          "${mod}+r" = "mode \"resize\"";

          # - Media ------------------------------

          # Pulse Audio controls
          "XF86AudioRaiseVolume" = "exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ +5%";
          "XF86AudioLowerVolume" = "exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ -5%";
          "Shift+XF86AudioRaiseVolume" = "exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ +1%";
          "Shift+XF86AudioLowerVolume" = "exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ -1%";
          "XF86AudioMute" = "exec --no-startup-id pactl set-sink-mute @DEFAULT_SINK@ toggle";

          # Media player controls
          "XF86AudioPlay" = "exec playerctl play-pause";
          "XF86AudioPause" = "exec playerctl play-pause";
          "XF86AudioNext" = "exec playerctl next";
          "XF86AudioPrev" = "exec playerctl previous";
          "XF86AudioStop" = "exec playerctl stop";

          # - 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";

          "${mod}+Shift+1" = "move container to workspace 1; workspace 1";
          "${mod}+Shift+2" = "move container to workspace 2; workspace 2";
          "${mod}+Shift+3" = "move container to workspace 3; workspace 3";
          "${mod}+Shift+4" = "move container to workspace 4; workspace 4";
          "${mod}+Shift+5" = "move container to workspace 5; workspace 5";
          "${mod}+Shift+6" = "move container to workspace 6; workspace 6";
          "${mod}+Shift+7" = "move container to workspace 7; workspace 7";
          "${mod}+Shift+8" = "move container to workspace 8; workspace 8";
          "${mod}+Shift+9" = "move container to workspace 9; workspace 9";
          "${mod}+Shift+0" = "move container to workspace 10; workspace 10";
        } // cfg.extraKeybindings;
      };
    };
  };
}