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

with lib;

let
  cfg = config.services.crs-tracker;
  configFile = pkgs.writeText "crs-tracker-config.php" ''
    <?php
      Log::setPath(ROOT . '../log/application.log');
      Log::setLevel(Log::INFO);
      Log::colorize(true);

      Database_PostgreSQL::init(
              '${cfg.dbHost}',
              '${cfg.dbUsername}',
              '${cfg.dbPassword}',
              '${cfg.dbDatabase}'
      );

      // TODO: make timezone a user setting or get it from browser
      Database::$Instance->query(
              'SET timezone = ' . Database::$Instance->quote(date_default_timezone_get())
      );

      requires('Cache/Adapter/APC');
      Cache::setAdapter(new Cache_Adapter_APC());

      session_set_cookie_params(0, '/', null, false, true);

      libxml_disable_entity_loader(true);
    ?>
  '';
  tracker = pkgs.stdenv.mkDerivation {
    src = pkgs.crs-tools.tracker;
    name = "tracker-with-config";
    buildPhase = ''
      mkdir $out
      cp -r $src/* $out
      chmod +w $out/src/Config/
      ln -s ${configFile} $out/src/Config/Config.php
    '';
    phases = [ "buildPhase" ];
  };
in {
  options.services.crs-tracker = {
    enable = mkOption {
      type = types.bool;
      default = false;
      description = "tracker fahren.";
    };

    dbHost = mkOption {
      type = types.str;
      default = "localhost";
      description =
        "domain the database runs on. This must be a postgres < 12.";
    };

    dbUsername = mkOption {
      type = types.str;
      default = "crstracker";
    };

    dbPassword = mkOption {
      type = types.str;
      default = "";
    };

    dbDatabase = mkOption {
      type = types.str;
      default = "crstracker";
    };

    nginxVirtualHostConfig = mkOption {
      type = types.submodule (import "${modulesPath}/services/web-servers/nginx/vhost-options.nix" {
        inherit config lib;
      });
      default = {};
    };
  };

  config = mkIf cfg.enable {

    services.phpfpm = {
      pools.crs-tracker = {
        phpPackage = pkgs.crs-tools.php;
        user = "crs-tools";
        group = "crs-tools";
        settings = {
          "listen.owner" = config.services.nginx.user;
          "listen.group" = config.services.nginx.group;
          "pm" = "dynamic";
          "pm.max_children" = "32";
          "pm.start_servers" = "2";
          "pm.min_spare_servers" = "2";
          "pm.max_spare_servers" = "4";
          "pm.max_requests" = "500";
          "access.log" = "/var/log/$pool.access.log";
        };
      };
    };
    users.users.crs-tools = {
      group = "crs-tools";
      isSystemUser = true;
      home = tracker.outPath;
    };
    users.groups.crs-tools.members = [ "crs-tools" ];

    services.nginx = {
      enable = mkDefault true;

      virtualHosts."crs-tools" = cfg.nginxVirtualHostConfig // {
        root = "${tracker}/src/Public";
        locations."~ ^/(downloads|css|images|thumbnails|javascript|fahrplan)/".priority = 900;
        locations."/" = {
          extraConfig = ''
            # include ${config.services.nginx.package}/conf/fastcgi.conf;
            include ${config.services.nginx.package}/conf/fastcgi_params;
            fastcgi_split_path_info ^(.+?)(\\/.*)$;
            fastcgi_param PATH_INFO $fastcgi_path_info;
            fastcgi_param SCRIPT_FILENAME $document_root/index.php;
            fastcgi_index index.php;
            fastcgi_pass unix:${config.services.phpfpm.pools.crs-tracker.socket};
            # remove trailing slash
            rewrite ^(.+)/$ $1 permanent;
            rewrite ^(.*)$ /index.php$1 break;
          '';
        };
      };
    };
  };
}