{ pkgs, lib, config, ... }:
let
  im = config.i18n.inputMethod;
  cfg = im.fcitx5;
  fcitx5Package = pkgs.libsForQt5.fcitx5-with-addons.override { inherit (cfg) addons; };
in
{
  i18n.inputMethod = {
    enabled = "fcitx5";
    fcitx5.addons = with pkgs; [
      fcitx5-mozc
      fcitx5-gtk
      # fcitx5-chinese-addons
    ];
  };

  xdg.configFile = let
    format = pkgs.formats.ini { };
  in {
    "fcitx5/profile".source = format.generate "fcitx5-profile" {
      "Groups/0" = {
        Name = "Default";
        "Default Layout" = "us";
        DefaultIM = "mozc";
      };
      "Groups/0/Items/0" = {
        Name = "keyboard-us";
        Layout = "";
      };
      "Groups/0/Items/1" = {
        Name = "keyboard-no";
        Layout = "";
      };
      "Groups/0/Items/2" = {
        Name = "mozc";
        Layout = "";
      };
      GroupOrder = {
        "0" = "Default";
      };
    };

    "fcitx5/config".source = format.generate "fcitx5-config" {
      Hotkey = {
        # Enumerate when press trigger key repeatedly
        EnumerateWithTriggerKeys = "True";
        # Temporally switch between first and current Input Method
        AltTriggerKeys = "";
        # Enumerate Input Method Forward
        EnumerateForwardKeys = "";
        # Enumerate Input Method Backward
        EnumerateBackwardKeys = "";
        # Skip first input method while enumerating
        EnumerateSkipFirst = "False";
      };

      "Hotkey/TriggerKeys" = {
        "0" = "Control+space";
        "1" = "Zenkaku_Hankaku";
        "2" = "Hangul";
      };

      "Hotkey/EnumerateGroupForwardKeys"."0" = "Super+space";
      "Hotkey/EnumerateGroupBackwardKeys"."0" = "Shift+Super+space";
      "Hotkey/ActivateKeys"."0" = "Hangul_Hanja";
      "Hotkey/DeactivateKeys"."0" = "Hangul_Romaja";
      "Hotkey/PrevPage"."0" = "Up";
      "Hotkey/NextPage"."0" = "Down";
      "Hotkey/PrevCandidate"."0" = "Shift+Tab";
      "Hotkey/NextCandidate"."0" = "Tab";
      "Hotkey/TogglePreedit"."0" = "Control+Alt+P";

      Behaviour = {
        # Active By Default
        ActiveByDefault = "False";
        # Share Input State
        ShareInputState = "All";
        # Show preedit in application
        PreeditEnabledByDefault = "True";
        # Show Input Method Information when switch input method
        ShowInputMethodInformation = "True";
        # Show Input Method Information when changing focus
        showInputMethodInformationWhenFocusIn = "False";
        # Show compact input method information
        CompactInputMethodInformation = "True";
        # Show first input method information
        ShowFirstInputMethodInformation = "True";
        # Default page size
        DefaultPageSize = 5;
        # Override Xkb Option
        OverrideXkbOption = "False";
        # Custom Xkb Option
        CustomXkbOption = "";
        # Force Enabled Addons
        EnabledAddons = "";
        # Force Disabled Addons
        DisabledAddons = "";
        # Preload input method to be used by default
        PreloadInputMethod = "True";
        # Allow input method in the password field
        AllowInputMethodForPassword = "False";
        # Show preedit text when typing password
        ShowPreeditForPassword = "False";
        # Interval of saving user data in minutes
        AutoSavePeriod = 30;
      };
    };
  };

  systemd.user.services.fcitx5-daemon = {
    Service.Restart="on-failure";
    Service.ExecStart = lib.mkForce "${fcitx5Package}/bin/fcitx5";
    Service.ExecReload = "/bin/kill -HUP $MAINPID";
  };
}