{ config, lib, ... }: 

let cfg = config.custom.gui.bar; 

in {

  options.custom.gui.bar = with lib; with types; {
    network.wifi = lib.mkOption {
      type = str;
      default = "";
    };
    network.eth = lib.mkOption {
      type = str;
      default = "";
    };
    network.vpn = lib.mkOption {
      type = str;
      default = "";
    };
    audio.wireplumber = lib.mkOption {
      type = bool;
      default = true;
    };
    battery.name = lib.mkOption {
      type = str;
      default = "";
    };
    bluetooth.enable = lib.mkEnableOption "bluetooth";
  };
  
  config = {
    programs.waybar = {
      enable = true;
      systemd = {
        enable = true;
        target = "sway-session.target";
      };
      settings = [{
        layer = "top";
        modules-left = [
          "sway/workspaces"
          "sway/mode"
          "mpd"
        ];
        modules-right = with lib; flatten [
          "cpu"           
          "disk"
          (optional (cfg.battery.name != "") "battery")
          (optional (cfg.bluetooth.enable != "") "bluetooth")
          (optional (cfg.network.wifi != "") "network#wifi")
          (optional (cfg.network.eth != "") "network#eth")
          (optional (cfg.network.vpn != "") "network#vpn")
          (if cfg.audio.wireplumber
            then "wireplumber"
            else "pulseaudio")
          "clock#date"
          "clock#time"
        ];
        "mpd" = {
          "format" = "{artist} | {title}";
          "format-stopped" = "";
          "format-disconnected" = "";
        };
        "clock#time" = {
          "format" = "{:%H:%M:%S}";
          "interval" = 1;
        };
        "clock#date" = {
          "format" = "{:%Y-%m-%d}";
          "interval" = 60;
        };
        "network#wifi" = {
          "interface" = cfg.network.wifi;
        };
        "network#eth" = {
          "interface" = cfg.network.eth;
        };
        "network#vpn" = {
          "interface" = cfg.network.vpn;
        };
        "pulseaudio" = {
          "format" = "{desc}: {volume}%";
        };
        "wireplumber" = {
          "format" = "{node_name}: {volume}%";
        };
        "battery" = {
          "bat" = cfg.battery.name;
          "format-discharging" = "{capacity}% (battery)";
          "format-charging" = "{capacity}% (charging)";
          "format-full" = "";
          "states" = {
            "critical" = 20;
          };
        };
        "bluetooth" = {
          "format" = "";
          "format-on" = "";
          "format-connected" = "{device_alias}";
        };
        "disk" = {
          "format" = "{used} :: {free}";
        };
        "sway/workspaces" = {
          "all-outputs" = true;
        };
      }];

      style = let
        green    = "#27e67a";
        yellow   = "#edd340";
        pink     = "#ff4787";
        teal     = "#1bcf9c";
        blue     = "#3988e3";
        violet   = "#9063e6";
        lime     = "#bfed5a";
        red      = "#eb3b5b";
        disabled = ''
        	color: #ffffff;
          background-color: rgba(207, 207, 207, 0.4);
        '';
      in ''

        /* General/shared styles */

        * {
          font-family: 'Fira Code';
          font-weight: 700;
          font-size: 12px;
        }

        window#waybar {
          background-color: rgba(0, 0, 0, 0.7);
        }

        #battery,
        #bluetooth,
        #clock,
        #cpu,
        #disk,
        #mode,
        #mpd,
        #network,
        #pulseaudio,
        #wireplumber
        {
          padding: 2px 10px;
          margin: 5px;
          border-radius: 100px;
        }

        #cpu, #disk, #bluetooth, #mpd {
          color: #ffffff;
          background-color: rgba(0, 0, 0, 0.4);
        }


        /* Sway chips */

        #workspaces {
          margin-left: 5px;
          padding: 0;
          margin: 5px;
          border-radius: 200px;
          background-color: rgba(0, 0, 0, 0.4);
        }

        #workspaces button {
          margin: 0;
          padding: 0 5px;
          border-radius: 100px;
          color: #ffffff;
          background-color: rgba(0, 0, 0, 0.4);
        }

        #workspaces button.visible.focused {
          color: #212121;
          background-color: ${green};
        }

        #workspaces button.visible {
          color: ${green};
        }

        #mode {
          background-color: ${teal};
        }


        /* Clock chips */

        #clock {
          color: #ffffff;
          background-color: transparent;
        }

        #clock.date { padding-right: 0; }
        #clock.time { padding-left: 0;  }


        /* Radio chips */

        #network {
          background-color: ${green};
        }

        #network.disconnected {
          ${disabled}
        }

        #bluetooth.connected {
          background-color: ${blue};
        }


        /* Audio chip */

        #pulseaudio,
        #wireplumber
        {
          background-color: ${yellow};
        }

        #pulseaudio.muted,
        #wireplumber.muted
        {
          ${disabled}
        }


        /* Battery chip */

        #battery.discharging {
          color: #ffffff;
          background-color: ${violet};
        }

        #battery.charging {
          background-color: ${lime};
        }

        #battery.critical {
          background-color: ${red};
        }


        /* MPD chip */

        #mpd.playing {
          color: #ffffff;
        }

        #mpd.paused {
          ${disabled}
        }

      '';
    };
  };

}