{lib, config, ...}:
let
  theme = import ../data/theme.nix {inherit config; };
  utils = import ../utils.nix {inherit lib; };
in let
  self = rec {
    # ModuleDesc has the shape {name, config?, background?, color?, style?}
    module-descs = [
      {
        name = "custom/left-most";
        background = theme.background;
      }
      {
        name = "pulseaudio";
        config = {
          format = "{volume}% {icon} {format_source}";
          format-bluetooth = "{volume}% {icon} {format_source}";
          format-muted = "{format_source}";
          format-source = "{volume}% ";
          format-source-muted = "";
          format-icons = {
            headphones = "";
            default = ["" "" ""];
          };
          on-click = "pavucontrol";
        };
        background = theme.normal.yellow;
      }
      {
        name = "network";
        config = {
          format-wifi = "{essid} {signalStrength}% {icon}";
          format-ethernet = "{ipaddr} 󰈀";
          format-disconnected = "Disconnected 󰤮";
          tooltip-format = ''Interface: {ifname}
IP: {ipaddr}
Speed: {bandwidthUpBytes} / {bandwidthDownBytes}
Signal: {signalStrength}%
SSID: {essid} {frequency}'';
          on-click = "iwgtk";
          format-icons = ["󰤯" "󰤟" "󰤢" "󰤥" "󰤨"];
        };
        background = theme.normal.green;
      }
      {
        name = "custom/vpn";
        config = {
          format = "{}";
          excape = true;
          interval = 30;
          exec = "nordvpn-rofi.sh --status-json";
          return-type = "json";
          on-click = "rofi -show vpn -modes 'vpn:nordvpn-rofi.sh'";
        };
        style = {
          connected.color = theme.normal.black;
          disconnected.color = theme.normal.yellow;
        };
        background = theme.extra.teal;}
    ]
    ++ (if (config.has_battery) then [{
      name = "battery";
      config = {
        states = {
          critical = 15;
          warning = 25;
          good = 80;
          full = 90;
        };
        interval = 30;
        format = "{capacity}% {icon}";
        format-charging = "{capacity}% ";
        format-plugged = "{capacity}% ";
        format-icons = ["" "" "" "" ""];
      };
      background = theme.extra.aqua;
    }] else [])
    ++ [
      {
        name = "cpu";
        config = {
          format = "{}% ";
        };
        background = theme.extra.brown;
      }
      {
        name = "memory";
        config = {
          format = "{}% ";
        };
        background = theme.extra.darkbrown;
      }
      {
        name = "temperature";
        config = {
          critical-threshold = 80;
          hwmon-path = "/sys/class/hwmon/hwmon5/temp1_input";
          format = "{temperatureC}°C {icon}";
          format-icons = ["" "" ""];
        };
        background = theme.extra.darkerbrown;
      }
      {
        name = "clock";
        config = {
          format = "{:%H:%M} 󰥔";
          tooltip-format = "<tt><small>{calendar}</small></tt>";
          calendar = {
            mode = "month";
            weeks-pos = "left";
            on-scroll = 1;
            format = {
              months = "<span color=\"${theme.normal.yellow}\"><b>{}</b></span>";
              days = "<span color=\"${theme.normal.white}\"><b>{}</b></span>";
              weekdays = "<span color=\"${theme.bright.black}\"><b>{}</b></span>";
              today = "<span color=\"${theme.normal.red}\"><b>{}</b></span>";
            };
            on-scroll-up = "shift_up";
            on-scroll-down = "shift_down";
          };
        };
        background = theme.normal.black;
      }
      {name = "tray"; config = { spacing = 10; }; background = theme.background;}
    ];

    # default style for modules
    default-style = "padding-left: 8pt; padding-right: 8pt;";

    # ModuleDesc -> Module
    mkModule = desc: let
      background = desc.background or theme.background;
      color = desc.color or theme.foreground;
      config = desc.config or {};
      # style = module.style or "";
      style = default-style;
      style-name = builtins.replaceStrings ["/"] ["-"] desc.name;
    in {
      inherit (desc) name;
      setting = {
      } // config;

      style = "#${style-name} {" + default-style + ''background: ${background};color: ${color};'' + "}\n";
    };

    mkSpacer = idx: left: right: {
      name = "custom/arrow${toString idx}";
      setting = {
        format = "";
        tooltip = false;
      };
      style = "#custom-arrow${toString idx} {font-size: 14pt;background: ${left.background};color: ${right.background};}\n";
    };

    # modules interlaced with spacers
    # [ModuleDesc] -> [Module]
    mkSpacedModules = descs: with builtins;
      let
        len = length descs;
      in lib.lists.flatten
        (lib.lists.imap0
          (n: descs: let
            left = elemAt descs 0;
            right = elemAt descs 1;
          in if n == len then [
            (mkModule left)
            (mkSpacer n left right)
            (mkModule right)
          ] else [
            (mkModule left)
            (mkSpacer n left right)
          ])
          (utils.windows 2 descs)
        );

    # Module -> {"name" = setting}
    mkModuleConfig = {name, setting, ...}: lib.attrsets.optionalAttrs (!utils.isEmptySet setting) {
      "${name}" = setting;
    };

    # builds bar configuration with left, center, and right modules
    # right modules get spacers in between them.
    # {left: [ModuleDesc], center: [ModuleDesc], right: [ModuleDesc], config: {}} -> {config, style}
  mkBar = {left, center, right, config, ...}:
    let
      # Create modules from the descriptions
      right' = mkSpacedModules right;
      left' = map (module: mkModule module) left;
      center' = map (module: mkModule module) center;
    in let
      # Create lists of module names for the config
      modules-left = map (module: module.name) left';
      modules-center = map (module: module.name) center';
      modules-right = map (module: module.name) right';
      # Combine all modules into a single list
      modules = lib.lists.flatten [left' center' right'];
    in {
      config = lib.attrsets.mergeAttrsList (lib.lists.flatten [
        {
          inherit modules-left modules-center modules-right;
        }
        config
        (map mkModuleConfig modules)
      ]);
      style = lib.strings.concatStringsSep "\n" (map (module: module.style) modules);
    };
  };

  bar = self.mkBar {
    left = [ {name = "sway/workspaces";} {name = "sway/mode";} ];
    center = [ {name = "sway/window";} ];
    right = self.module-descs;
    config = {
      height = 25;
      spacing = 0;
      position = "top";
    };
  };
in {
  imports = [ ../options.nix ];
  programs.waybar = {
    enable = true;

    settings = {
      mainBar = bar.config;
    };

    style = ''
* {border: none; border-radius: 0; min-height: 0; margin: 0; padding: 0; box-shadow: none; text-shadow: none;}
#waybar { background: rgba(40, 40, 40, 0.3); color: #ffffff; font-family: "sans-serif"; font-size: 12pt; font-weight: 500; }
''
      + bar.style;
  };
}