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

let

  lockCmd =
    "${pkgs.betterlockscreen}/bin/betterlockscreen --lock --display 1 --blur 0.5 --span";
  lockUpdate =
    "${pkgs.betterlockscreen}/bin/betterlockscreen --update ${config.wallpaper} --display 1 --span";

in {

  config = lib.mkIf pkgs.stdenv.isLinux {

    services.xserver.windowManager = {
      i3 = { enable = config.services.xserver.enable; };
    };

    environment.systemPackages = with pkgs; [
      feh # Wallpaper
      playerctl # Media control
    ];

    home-manager.users.${config.user} = {
      xsession.windowManager.i3 = {
        enable = config.services.xserver.enable;
        config = let
          modifier = "Mod4"; # Super key
          ws1 = "1:I";
          ws2 = "2:II";
          ws3 = "3:III";
          ws4 = "4:IV";
          ws5 = "5:V";
          ws6 = "6:VI";
          ws7 = "7:VII";
          ws8 = "8:VIII";
          ws9 = "9:IX";
          ws10 = "10:X";
        in {
          modifier = modifier;
          assigns = {
            "${ws1}" = [{ class = "Firefox"; }];
            "${ws2}" = [
              { class = "kitty"; }
              { class = "aerc"; }
              { class = "obsidian"; }
            ];
            "${ws3}" = [{ class = "discord"; }];
            "${ws4}" = [{ class = "Steam"; }];
          };
          bars = [{ command = "echo"; }]; # Disable i3bar
          colors = let
            background = config.theme.colors.base00;
            inactiveBackground = config.theme.colors.base01;
            border = config.theme.colors.base01;
            inactiveBorder = config.theme.colors.base01;
            text = config.theme.colors.base07;
            inactiveText = config.theme.colors.base04;
            urgentBackground = config.theme.colors.base08;
            indicator = "#00000000";
          in {
            background = config.theme.colors.base00;
            focused = {
              inherit background indicator text border;
              childBorder = background;
            };
            focusedInactive = {
              inherit indicator;
              background = inactiveBackground;
              border = inactiveBorder;
              childBorder = inactiveBackground;
              text = inactiveText;
            };
            # placeholder = { };
            unfocused = {
              inherit indicator;
              background = inactiveBackground;
              border = inactiveBorder;
              childBorder = inactiveBackground;
              text = inactiveText;
            };
            urgent = {
              inherit text indicator;
              background = urgentBackground;
              border = urgentBackground;
              childBorder = urgentBackground;
            };
          };
          floating.modifier = modifier;
          focus = {
            mouseWarping = true;
            newWindow = "urgent";
            followMouse = false;
          };
          keybindings = {

            # Adjust screen brightness
            "Shift+F12" =
              "exec ${pkgs.ddcutil}/bin/ddcutil --display 1 setvcp 10 + 30 && sleep 1; exec ${pkgs.ddcutil}/bin/ddcutil --display 2 setvcp 10 + 30";
            "Shift+F11" =
              "exec ${pkgs.ddcutil}/bin/ddcutil --display 1 setvcp 10 - 30 && sleep 1; exec ${pkgs.ddcutil}/bin/ddcutil --display 2 setvcp 10 - 30";
            "XF86MonBrightnessUp" =
              "exec ${pkgs.ddcutil}/bin/ddcutil --display 1 setvcp 10 + 30 && sleep 1; exec ${pkgs.ddcutil}/bin/ddcutil --display 2 setvcp 10 + 30";
            "XF86MonBrightnessDown" =
              "exec ${pkgs.ddcutil}/bin/ddcutil --display 1 setvcp 10 - 30 && sleep 1; exec ${pkgs.ddcutil}/bin/ddcutil --display 2 setvcp 10 - 30";

            # Media player controls
            "XF86AudioPlay" = "exec ${pkgs.playerctl}/bin/playerctl play-pause";
            "XF86AudioStop" = "exec ${pkgs.playerctl}/bin/playerctl stop";
            "XF86AudioNext" = "exec ${pkgs.playerctl}/bin/playerctl next";
            "XF86AudioPrev" = "exec ${pkgs.playerctl}/bin/playerctl previous";

            # Launchers
            "${modifier}+Return" =
              "exec --no-startup-id kitty; workspace ${ws2}; layout tabbed";
            "${modifier}+space" =
              "exec --no-startup-id ${config.launcherCommand}";
            "${modifier}+Shift+s" =
              "exec --no-startup-id ${config.systemdSearch}";
            "${modifier}+Shift+a" =
              "exec --no-startup-id ${config.audioSwitchCommand}";
            "Mod1+Tab" = "exec --no-startup-id ${config.altTabCommand}";
            "${modifier}+Shift+c" = "reload";
            "${modifier}+Shift+r" = "restart";
            "${modifier}+Shift+q" = ''
              exec "i3-nagbar -t warning -m 'You pressed the exit shortcut. Do you really want to exit i3? This will end your X session.' -B 'Yes, exit i3' 'i3-msg exit'"'';
            "${modifier}+Shift+x" = "exec ${lockCmd}";

            # Window options
            "${modifier}+q" = "kill";
            "${modifier}+b" = "exec ${config.toggleBarCommand}";
            "${modifier}+f" = "fullscreen toggle";
            "${modifier}+h" = "focus left";
            "${modifier}+j" = "focus down";
            "${modifier}+k" = "focus up";
            "${modifier}+l" = "focus right";
            "${modifier}+Left" = "focus left";
            "${modifier}+Down" = "focus down";
            "${modifier}+Up" = "focus up";
            "${modifier}+Right" = "focus right";
            "${modifier}+Shift+h" = "move left";
            "${modifier}+Shift+j" = "move down";
            "${modifier}+Shift+k" = "move up";
            "${modifier}+Shift+l" = "move right";
            "${modifier}+Shift+Left" = "move left";
            "${modifier}+Shift+Down" = "move down";
            "${modifier}+Shift+Up" = "move up";
            "${modifier}+Shift+Right" = "move right";

            # Tiling
            "${modifier}+i" = "split h";
            "${modifier}+v" = "split v";
            "${modifier}+s" = "layout stacking";
            "${modifier}+t" = "layout tabbed";
            "${modifier}+e" = "layout toggle split";
            "${modifier}+Shift+space" = "floating toggle";
            "${modifier}+Control+space" = "focus mode_toggle";
            "${modifier}+a" = "focus parent";

            # Workspaces
            "${modifier}+1" = "workspace ${ws1}";
            "${modifier}+2" = "workspace ${ws2}";
            "${modifier}+3" = "workspace ${ws3}";
            "${modifier}+4" = "workspace ${ws4}";
            "${modifier}+5" = "workspace ${ws5}";
            "${modifier}+6" = "workspace ${ws6}";
            "${modifier}+7" = "workspace ${ws7}";
            "${modifier}+8" = "workspace ${ws8}";
            "${modifier}+9" = "workspace ${ws9}";
            "${modifier}+0" = "workspace ${ws10}";

            # Move windows
            "${modifier}+Shift+1" =
              "move container to workspace ${ws1}; workspace ${ws1}";
            "${modifier}+Shift+2" =
              "move container to workspace ${ws2}; workspace ${ws2}";
            "${modifier}+Shift+3" =
              "move container to workspace ${ws3}; workspace ${ws3}";
            "${modifier}+Shift+4" =
              "move container to workspace ${ws4}; workspace ${ws4}";
            "${modifier}+Shift+5" =
              "move container to workspace ${ws5}; workspace ${ws5}";
            "${modifier}+Shift+6" =
              "move container to workspace ${ws6}; workspace ${ws6}";
            "${modifier}+Shift+7" =
              "move container to workspace ${ws7}; workspace ${ws7}";
            "${modifier}+Shift+8" =
              "move container to workspace ${ws8}; workspace ${ws8}";
            "${modifier}+Shift+9" =
              "move container to workspace ${ws9}; workspace ${ws9}";
            "${modifier}+Shift+0" =
              "move container to workspace ${ws10}; workspace ${ws10}";

            # Move screens
            "${modifier}+Control+l" = "move workspace to output right";
            "${modifier}+Control+h" = "move workspace to output left";

            # Resizing
            "${modifier}+r" = ''mode "resize"'';
            "${modifier}+Control+Shift+h" =
              "resize shrink width 10 px or 10 ppt";
            "${modifier}+Control+Shift+j" =
              "resize grow height 10 px or 10 ppt";
            "${modifier}+Control+Shift+k" =
              "resize shrink height 10 px or 10 ppt";
            "${modifier}+Control+Shift+l" = "resize grow width 10 px or 10 ppt";
          };
          modes = { };
          startup = [
            {
              command = "feh --bg-fill ${config.wallpaper}";
              always = true;
              notification = false;
            }
            {
              command =
                "i3-msg workspace ${ws2}, move workspace to output right";
              notification = false;
            }
            {
              command =
                "i3-msg workspace ${ws1}, move workspace to output left";
              notification = false;
            }
          ];
          window = {
            border = 0;
            hideEdgeBorders = "smart";
            titlebar = false;
          };
          workspaceAutoBackAndForth = false;
          workspaceOutputAssign = [ ];
          # gaps = {
          # bottom = 8;
          # top = 8;
          # left = 8;
          # right = 8;
          # horizontal = 15;
          # vertical = 15;
          # inner = 15;
          # outer = 0;
          # smartBorders = "off";
          # smartGaps = false;
          # };
        };
        extraConfig = "";
      };

      programs.fish.functions = {
        update-lock-screen = lib.mkIf config.services.xserver.enable {
          description = "Update lockscreen with wallpaper";
          body = lockUpdate;
        };
      };

      # Update lock screen cache only if cache is empty
      home.activation.updateLockScreenCache =
        let cacheDir = "${config.homePath}/.cache/betterlockscreen/current";
        in lib.mkIf config.services.xserver.enable
        (config.home-manager.users.${config.user}.lib.dag.entryAfter
          [ "writeBoundary" ] ''
            if [ ! -d ${cacheDir} ] || [ -z "$(ls ${cacheDir})" ]; then
                $DRY_RUN_CMD ${lockUpdate}
            fi
          '');

    };

    # Ref: https://github.com/betterlockscreen/betterlockscreen/blob/next/system/betterlockscreen%40.service
    systemd.services.lock = {
      enable = config.services.xserver.enable;
      description = "Lock the screen on resume from suspend";
      before = [ "sleep.target" "suspend.target" ];
      serviceConfig = {
        User = config.user;
        Type = "simple";
        Environment = "DISPLAY=:0";
        TimeoutSec = "infinity";
        ExecStart = lockCmd;
        ExecStartPost = "${pkgs.coreutils-full}/bin/sleep 1";
      };
      wantedBy = [ "sleep.target" "suspend.target" ];
    };

  };

}