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

with lib;

let
  cfg = config.services.keycloak;
  vhost = vhosts.${cfg.hostname} or { };
  port = vhost.ports.http or 8080;
in {
  options.services.keycloak = {
    enable = mkEnableOption "Keycloak identity provider";

    database = {
      host = mkOption {
        type = types.str;
        default = "localhost";
        description = "Database host";
      };

      name = mkOption {
        type = types.str;
        default = "keycloak";
        description = "Database name";
      };

      user = mkOption {
        type = types.str;
        default = "keycloak";
        description = "Database user";
      };

      passwordFile = mkOption {
        type = types.path;
        description = "Path to file containing database password";
      };
    };

    adminUser = mkOption {
      type = types.str;
      default = "admin";
      description = "Admin username";
    };

    adminPasswordFile = mkOption {
      type = types.path;
      description = "Path to file containing admin password";
    };

    hostname = mkOption {
      type = types.str;
      description = "Keycloak hostname";
    };

    settings = mkOption {
      type = types.attrs;
      default = {};
      description = "Additional Keycloak settings";
    };
  };

  config = mkIf cfg.enable {
    services.keycloak = {
      enable = true;
      settings = {
        hostname = cfg.hostname;
        http-port = port;
        hostname-strict-backchannel = true;
        proxy = "edge";
        db = mkDefault "postgres";
        db-url = "jdbc:postgresql://${cfg.database.host}/${cfg.database.name}";
        db-username = cfg.database.user;
        db-password-file = cfg.database.passwordFile;
        admin-user = cfg.adminUser;
        admin-password-file = cfg.adminPasswordFile;
      } // cfg.settings;
    };
  };
}