{ config, pkgs, lib, ... }:
with lib;
let
  cfg = config.services.wordpress;
  callPackage = pkgs.callPackage;
  appConfig = (import ./default-app-config.nix).extend (self: super: {
    wpConfig = super.wpConfig.extend (self: super: {
      secrets = cfg.wpConfigSecrets;
    });
  });
  writeableDataPath = "/var/lib/phpfpm/${appConfig.name}";
  phpFpmListen = "/run/phpfpm/wordpress-pool.sock";
  php = import ./php-config.nix { inherit pkgs config appConfig;
    php = pkgs.php74;
  };
  phpIni = php.phpIni;
  app = callPackage ./app.nix {
    inherit appConfig;
    writeable = {
      sysPath = writeableDataPath;
      owner = config.services.nginx.user;
    };
  };
in {
  disabledModules = [ "services/web-apps/wordpress.nix" ];
  options.services.wordpress = {
    enable = mkEnableOption "Enable the WordPress module";
    domain = mkOption {
      type = types.str;
    };
    wpConfigSecrets = mkOption {
      type = types.str;
    };
    enablePageSpeed = mkOption {
      type = types.bool;
      default = false; # TODO: backport some patch first, pkgs.stdenv.isLinux && appConfig.googlePageSpeed.enable; - https://github.com/apache/incubator-pagespeed-ngx/issues/1735
    };
    user = mkOption {
      type = types.str;
      default = "wordpress";
    };
    group = mkOption {
      type = types.str;
      default = "wordpress";
    };
  };
  config = mkIf cfg.enable {
    users.users.${cfg.user} = {
      isSystemUser = true;
      inherit (cfg) group;
    };
    users.groups.${cfg.group} = {};

    environment.systemPackages = [ pkgs.wp-cli ];

    services.nginx = {
      enable = true;
      additionalModules = with pkgs.nginxModules; [
        dav cache-purge moreheaders
      ] ++ optional cfg.enablePageSpeed pagespeed;
      virtualHosts."${cfg.domain}" = {
        root = app.package;
        locations."/" = {
          tryFiles = "$uri/index.html $uri $uri/ /index.php?$query_string;";
        };
        # fast cgi conf
        locations."~ [^/]\\.php(/|$)" = {
          extraConfig = ''
            index index.html index.htm index.php;

            fastcgi_split_path_info ^(.+\.php)(/.+)$;
            fastcgi_pass unix:${phpFpmListen};
            fastcgi_index index.php;
          '';
        };
      };
    };

    systemd.services.init-writeable-paths = {
      description = "Initialize writeable directories for the app";
      before = [ "phpfpm.service" ];
      after = [ "network.target" ];
      wantedBy = [ "multi-user.target" "phpfpm.service" "nginx.service" ];
      serviceConfig = {
        Type = "oneshot";
        ExecStart = app.initScript;
      };
    };

    systemd.services.install-wp =
      let deps = [ "init-writeable-paths.service" "mysql.service" ];
      in {
        enable = appConfig.autoInstall.enable;
        description = "Configure WordPress installation with WP-CLI";
        before = [ "nginx.service" ];
        after = deps;
        wants = deps;
        wantedBy = [ "multi-user.target" ];
        serviceConfig = {
          Type = "oneshot";
          ExecStart = import ./install-wp.nix {
            inherit pkgs config appConfig writeableDataPath;
            appPackage = app.package;
          };
        };
        environment.PHP_INI_SCAN_DIR =
          let customIni = pkgs.writeTextDir "wp-cli-custom.ini" phpIni;
          in "${pkgs.php}/etc:${customIni}";
      };

    services.phpfpm = {
      pools.wordpress-pool = import ./phpfpm-conf.nix {
        inherit (cfg) user group;
        inherit pkgs config phpFpmListen;
        phpPackage = php;
        processSettings = appConfig.phpFpmProcessSettings;
      };
    };

    services.mysql = {
      enable = true;
      package = pkgs.mariadb;

      ensureDatabases = [ "wordpress" ];
      ensureUsers = [
        {
          name = cfg.user;
          ensurePermissions = {
            "wordpress.*" = "ALL PRIVILEGES";
          };
        }
      ];
    };
  };
}