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

with lib;

let

  cfg = config.programs.custom.xterm;

in {

  options.programs.custom.xterm = {
    enable = mkEnableOption "configure and enable urxvt";
    fontSize = mkOption {
      type = types.int;
      default = 17;
      description = ''
        size of the terminal font
      '';
    };
    colorTheme = mkOption {
      type = types.enum [ "dark" "light" ];
      default = "dark";
      description = ''
        solarized color theme
      '';
    };
  };

  config = mkIf cfg.enable {

    environment.systemPackages = [ pkgs.xterm ];

    environment.etc = {

      "X11/Xresource.d/xterm".source = pkgs.writeText "Xresource-xterm" ''

        XTerm*termName:          xterm-256color
        XTerm*selectToClipboard: true

        XTerm.*.bellIsUrgent: true

      '';

      "X11/Xresource.d/xterm-font".source = let
        fontFamily = "terminus";
        normalFont = fontSize:
          "-*-${fontFamily}-medium-*-*-*-${toString fontSize}-*-*-*-*-*-*-*";
        boldFont = fontSize:
          "-*-${fontFamily}-bold-*-*-*-${toString fontSize}-*-*-*-*-*-*-*";
        italicFont = normalFont;
        itallicBoldFont = boldFont;
        backupFont = fontSize:
          "xft:TerminessTTF Nerd Font:pixelsize=${toString fontSize}";
      in pkgs.writeText "Xresource-xterm-font" ''

        XTerm.allow_bold:       true
        XTerm.xftAntialias:     true

        !! use xfontsel or fontmatrix to choose line
        !XTerm.*.font:             ${normalFont cfg.fontSize},${
          backupFont cfg.fontSize
        }
        !XTerm.*.boldFont:         ${boldFont cfg.fontSize},${
          backupFont cfg.fontSize
        }
        !XTerm.*.italicFont:       ${italicFont cfg.fontSize},${
          backupFont cfg.fontSize
        }
        !XTerm.*.bolditalicFont:   ${itallicBoldFont cfg.fontSize},${
          backupFont cfg.fontSize
        }

        XTerm.*.font:             ${normalFont cfg.fontSize}
        XTerm.*.boldFont:         ${boldFont cfg.fontSize}
        XTerm.*.italicFont:       ${italicFont cfg.fontSize}
        XTerm.*.bolditalicFont:   ${itallicBoldFont cfg.fontSize}
      '';

      "X11/Xresource.d/xterm-colors".source = let
        colorTheme = if (cfg.colorTheme == "dark") then ''
          #define S_base03                #002b36
          #define S_base02                #073642
          #define S_base01                #586e75
          #define S_base00                #657b83
          #define S_base0                 #839496
          #define S_base1                 #93a1a1
          #define S_base2                 #eee8d5
          #define S_base3                 #fdf6e3

        '' else ''
          #define S_base03               #fdf6e3
          #define S_base02               #eee8d5
          #define S_base01               #93a1a1
          #define S_base00               #839496
          #define S_base0                #657b83
          #define S_base1                #586e75
          #define S_base2                #073642
          #define S_base3                #002b36
        '';

      in pkgs.writeText "Xresource-xterm-colors" ''

        !! Color Configuration
        !! -------------------

        !! Common
        !! ------
        #define S_yellow                #b58900
        #define S_orange                #cb4b16
        #define S_red                   #dc322f
        #define S_magenta               #d33682
        #define S_violet                #6c71c4
        #define S_blue                  #268bd2
        #define S_cyan                  #2aa198
        #define S_green                 #859900

        !! ColorTheme
        !! ----------
        ${colorTheme}

        XTerm*background:               S_base03
        XTerm*foreground:               S_base0
        XTerm*fading:                   40
        XTerm*fadeColor:                S_base03
        XTerm*cursorColor:              S_base1
        XTerm*pointerColorBackground:   S_base01
        XTerm*pointerColorForeground:   S_base1

        XTerm*color0:                   S_base02
        XTerm*color1:                   S_red
        XTerm*color2:                   S_green
        XTerm*color3:                   S_yellow
        XTerm*color4:                   S_blue
        XTerm*color5:                   S_magenta
        XTerm*color6:                   S_cyan
        XTerm*color7:                   S_base2
        XTerm*color9:                   S_orange
        XTerm*color8:                   S_base03
        XTerm*color10:                  S_base01
        XTerm*color11:                  S_base00
        XTerm*color12:                  S_base0
        XTerm*color13:                  S_violet
        XTerm*color14:                  S_base1
        XTerm*color15:                  S_base3
      '';

    };

  };
}