{ pkgs, lib, config, ... }:
let
  # FOCUS
  focus = "exec ${ pkgs.writeShellScript "i3-focus-window" ''
    WINDOW=`${pkgs.xdotool}/bin/xdotool getwindowfocus`
    eval `${pkgs.xdotool}/bin/xdotool getwindowgeometry --shell $WINDOW` # this brings in variables WIDTH and HEIGHT
    TX=`${pkgs.coreutils}/bin/expr $WIDTH / 2`
    TY=`${pkgs.coreutils}/bin/expr $HEIGHT / 2`
    ${pkgs.xdotool}/bin/xdotool mousemove -window $WINDOW $TX $TY
  ''
  }";

  # CARDINALS
  cardinals = [
    { vi = "h"; arrow = "Left"; container = "left"; workspace = "prev_on_output"; output = "left"; }
    { vi = "l"; arrow = "Right"; container = "right"; workspace = "next_on_output"; output = "right"; }
    { vi = "j"; arrow = "Down"; container = "up"; workspace = "prev"; output = "below"; }
    { vi = "k"; arrow = "Up"; container = "down"; workspace = "next"; output = "above"; }
  ];
  forEachCardinal = f: map (c: f c) cardinals;

  # WORKSPACES
  workspaces_keys = lib.strings.stringToCharacters "1234567890";
  workspaces = map
    (i: {
      id = i;
      name = builtins.toString (i + 1);
      key = builtins.elemAt workspaces_keys i;
    })
    (lib.lists.range 0 ((builtins.length workspaces_keys) - 1));
  forEachWorkspace = f: map (w: f w) workspaces;

  # MISC
  mod = config.xsession.windowManager.i3.config.modifier;
  rofi = "exec --no-startup-id ${config.programs.rofi.package}/bin/rofi";
  modes = config.frogeye.desktop.i3.bindmodes;
  x11_screens = config.frogeye.desktop.x11_screens;
in
{
  config = lib.mkIf config.xsession.windowManager.i3.enable {
    stylix.targets.i3.enable = false;
    xdg.configFile = {
      "rofimoji.rc" = {
        text = ''
          skin-tone = neutral
          files = [emojis, math]
          action = clipboard
        '';
      };
    };
    xsession.windowManager.i3.config = {
      modifier = "Mod4";
      fonts = {
        names = [ config.stylix.fonts.sansSerif.name ];
      };
      terminal = "alacritty";
      colors = let ignore = "#ff00ff"; in
        with config.lib.stylix.colors.withHashtag; lib.mkForce {
          focused = { border = base0B; background = base0B; text = base00; indicator = base00; childBorder = base0B; };
          focusedInactive = { border = base02; background = base02; text = base05; indicator = base02; childBorder = base02; };
          unfocused = { border = base05; background = base04; text = base00; indicator = base04; childBorder = base00; };
          urgent = { border = base0F; background = base08; text = base00; indicator = base08; childBorder = base0F; };
          placeholder = { border = ignore; background = base00; text = base05; indicator = ignore; childBorder = base00; };
          background = base07;
          # I set the color of the active tab as the the background color of the terminal so they merge together.
        };
      focus.followMouse = false;
      keybindings =
        {
          # Compatibility layer for people coming from other backgrounds
          "Mod1+Tab" = "${rofi} -modi window -show window";
          "Mod1+F2" = "${rofi} -modi drun -show drun";
          "Mod1+F4" = "kill";
          # kill focused window
          "${mod}+z" = "kill";
          button2 = "kill";
          # Rofi
          "${mod}+i" = "exec --no-startup-id ${pkgs.rofimoji}/bin/rofimoji";
          "${mod}+Tab" = "${rofi} -modi window -show window";
          # start program launcher
          "${mod}+d" = "${rofi} -modi run -show run";
          "${mod}+Shift+d" = "${rofi} -modi drun -show drun";
          # Start Applications
          "${mod}+p" = "exec ${pkgs.xfce.thunar}/bin/thunar";
          # Misc
          "${mod}+F10" = "exec ${ pkgs.writeShellScript "show-keyboard-layout"
            ''
              layout=`${pkgs.xorg.setxkbmap}/bin/setxkbmap -query | ${pkgs.gnugrep}/bin/grep ^layout: | ${pkgs.gawk}/bin/awk '{ print $2 }'`
              ${pkgs.libgnomekbd}/bin/gkbd-keyboard-display -l $layout
            ''
            }";
          # workspace back and forth (with/without active container)
          "${mod}+b" = "workspace back_and_forth; ${focus}";
          "${mod}+Shift+b" = "move container to workspace back_and_forth; workspace back_and_forth; ${focus}";
          # Change container layout
          "${mod}+g" = "split h; ${focus}";
          "${mod}+v" = "split v; ${focus}";
          "${mod}+f" = "fullscreen toggle; ${focus}";
          "${mod}+s" = "layout stacking; ${focus}";
          "${mod}+w" = "layout tabbed; ${focus}";
          "${mod}+e" = "layout toggle split; ${focus}";
          "${mod}+Shift+space" = "floating toggle; ${focus}";
          # Focus container
          "${mod}+space" = "focus mode_toggle; ${focus}";
          "${mod}+a" = "focus parent; ${focus}";
          "${mod}+q" = "focus child; ${focus}";
          # i3 control
          "${mod}+Shift+c" = "reload";
          "${mod}+Shift+r" = "restart";
          "${mod}+Shift+e" = "exit";
        } // lib.mapAttrs' (k: v: lib.nameValuePair v.enter "mode ${v.name}") (lib.filterAttrs (k: v: v.enter != null) modes)
        // lib.attrsets.mergeAttrsList (forEachCardinal (c: {
          # change focus
          "${mod}+${c.vi}" = "focus ${c.container}; ${focus}";
          # move focused window
          "${mod}+Shift+${c.vi}" = "move ${c.container}; ${focus}";
          #navigate workspaces next / previous
          "${mod}+Ctrl+${c.vi}" = "workspace ${c.workspace}; ${focus}";
          # Move to workspace next / previous with focused container
          "${mod}+Ctrl+Shift+${c.vi}" = "move container to workspace ${c.workspace}; workspace ${c.workspace}; ${focus}";
          # move workspaces to screen (arrow keys)
          "${mod}+Ctrl+Shift+${c.arrow}" = "move workspace to output ${c.output}; ${focus}";
        })) // lib.attrsets.mergeAttrsList (forEachWorkspace (w: {
          # Switch to workspace
          "${mod}+${w.key}" = "workspace ${w.name}; ${focus}";
          # move focused container to workspace
          "${mod}+ctrl+${w.key}" = "move container to workspace ${w.name}; ${focus}";
          # move to workspace with focused container
          "${mod}+shift+${w.key}" = "move container to workspace ${w.name}; workspace ${w.name}; ${focus}";
        }));
      modes = lib.mapAttrs'
        (k: v: lib.nameValuePair v.name (v.bindings // lib.optionalAttrs v.return_bindings {
          "Return" = "mode default";
          "Escape" = "mode default";
        }))
        modes;
      window = {
        hideEdgeBorders = "both";
        titlebar = false; # So that single-container screens are basically almost fullscreen
        commands = [
          # switch to workspace with urgent window automatically
          { criteria = { urgent = "latest"; }; command = "focus"; }
        ];
      };
      floating = {
        criteria = [
          { window_role = "pop-up"; }
          { window_role = "task_dialog"; }
        ];
      };
      startup = [
        {
          notification = false;
          command = "${pkgs.writeShellApplication {
            name = "batteryNotify";
            runtimeInputs = with pkgs; [coreutils libnotify];
            text = builtins.readFile ./batteryNotify.sh;
            # TODO Use batsignal instead?
            # TODO Only on computers with battery
          }}/bin/batteryNotify";
        }
      ];
      workspaceLayout = "tabbed";
      focus.mouseWarping = true; # i3 only supports warping to workspace, hence ${focus}
      workspaceOutputAssign =
        forEachWorkspace (w: { output = builtins.elemAt x11_screens (lib.mod w.id (builtins.length x11_screens)); workspace = w.name; });
    };
    frogeye.desktop.i3.bindmodes = {
      "Resize" = {
        bindings = {
          "h" = "resize shrink width 10 px or 10 ppt; ${focus}";
          "j" = "resize grow height 10 px or 10 ppt; ${focus}";
          "k" = "resize shrink height 10 px or 10 ppt; ${focus}";
          "l" = "resize grow width 10 px or 10 ppt; ${focus}";
        };
        mod_enter = "r";
      };
      "[L] Vérouillage [E] Déconnexion [S] Veille [H] Hibernation [R] Redémarrage [P] Extinction" = {
        bindings = {
          "l" = "exec --no-startup-id exec xlock, mode default";
          "e" = "exit, mode default";
          "s" = "exec --no-startup-id exec xlock & ${pkgs.systemd}/bin/systemctl suspend --check-inhibitors=no, mode default";
          "h" = "exec --no-startup-id exec xlock & ${pkgs.systemd}/bin/systemctl hibernate, mode default";
          "r" = "exec --no-startup-id ${pkgs.systemd}/bin/systemctl reboot, mode default";
          "p" = "exec --no-startup-id ${pkgs.systemd}/bin/systemctl poweroff -i, mode default";
        };
        mod_enter = "Escape";
      };
    };
  };
  options = {
    frogeye.desktop.i3.bindmodes = lib.mkOption {
      default = { };
      type = lib.types.attrsOf (lib.types.submodule ({ config, name, ... }: {
        options = {
          name = lib.mkOption {
            type = lib.types.str;
            default = name;
          };
          bindings = lib.mkOption {
            type = lib.types.attrsOf lib.types.str;
            default = { };
          };
          enter = lib.mkOption {
            type = lib.types.nullOr lib.types.str;
            default = "${mod}+${config.mod_enter}";
          };
          mod_enter = lib.mkOption {
            type = lib.types.str;
          };
          return_bindings = lib.mkOption {
            type = lib.types.bool;
            default = true;
          };
        };
      }));
    };
  };
}