{
  lib,
  pkgs,
  config,
  ...
}:
let
  inherit (lib)
    literalExpression
    mkEnableOption
    mkIf
    mkOption
    mkPackageOption
    ;

  cfg = config.programs.opencode;

  jsonFormat = pkgs.formats.json { };
in
{
  meta.maintainers = with lib.hm.maintainers; [ delafthi ];

  options.programs.opencode = {
    enable = mkEnableOption "opencode";

    package = mkPackageOption pkgs "opencode" { nullable = true; };

    settings = mkOption {
      inherit (jsonFormat) type;
      default = { };
      example = literalExpression ''
        {
          theme = "opencode";
          model = "anthropic/claude-sonnet-4-20250514";
          autoshare = false;
          autoupdate = true;
        }
      '';
      description = ''
        Configuration written to {file}`$XDG_CONFIG_HOME/opencode/config.json`.
        See <https://opencode.ai/docs/config/> for the documentation.
      '';
    };
  };

  config = mkIf cfg.enable {
    home.packages = mkIf (cfg.package != null) [ cfg.package ];

    xdg.configFile."opencode/config.json" = mkIf (cfg.settings != { }) {
      source = jsonFormat.generate "config.json" cfg.settings;
    };
  };
}