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

let
  inherit (lib) mkIf mkMerge;
  cfg = config.bagel.services.ofborg;

  amqpHost = "amqp.forkos.org";
  amqpPort = 5671;
  generators = pkgs.formats.json { };
  configFile = generators.generate "ofborg-config.json" config.bagel.services.ofborg.settings;
  mkOfborgWorker = binaryName: extra: extra // {
    wantedBy = [ "multi-user.target" ];
    description = "ofborg CI service - ${binaryName} worker";
    after = [ "rabbitmq.service" ];
    serviceConfig = {
      DynamicUser = true;
      ExecStart = "${cfg.package}/bin/${binaryName} ${configFile}";
      # TODO: more hardening.
      StateDirectory = "ofborg";
      LogsDirectory = "ofborg";
      WorkingDirectory = "/var/lib/ofborg";
      LoadCredential = [ "rabbitmq-password:${config.age.secrets.rabbitmq-password.path}" ];
    };
  };
in {
  options.bagel.services.ofborg = with lib; {
    rabbitmq.enable = mkEnableOption "ofborg AMQP queue";
    builder.enable = mkEnableOption "ofborg builder worker";
    pastebin.enable = mkEnableOption "ofborg pastebin service";
    statcheck-worker.enable = mkEnableOption "ofborg status & checks worker";
    mass-rebuilder.enable = mkEnableOption "ofborg evaluator worker for mass rebuilds jobs";
    stats.enable = mkEnableOption "ofborg prometheus worker";

    gerrit-events-streamer.enable = mkEnableOption "ofborg's Gerrit event streamer";

    package = mkPackageOption pkgs "ofborg" { };

    settings = mkOption {
      type = generators.type;
    };
  };

  config = mkMerge [
    {
      age.secrets.rabbitmq-password.file = ../../secrets/floral/rabbitmq-password.age;
      # TODO: move this to global.
      bagel.services.ofborg.settings = {
        rabbitmq = {
          ssl = true;
          host = "amqp.forkos.org";
          virtualhost = "amqp.forkos.org";
          username = "worker";
          password_file = "$CREDENTIALS_DIRECTORY/rabbitmq-password";
        };
        feedback.full_logs = lib.mkDefault true;
        log_storage.path = lib.mkDefault "/var/log/ofborg";
        runner = {
          identity = config.networking.fqdn;
          repos = lib.mkDefault [
            "nixpkgs"
            "ofborg"
          ];

          disable_trusted_users = true;
        };
        checkout.root = lib.mkDefault "/var/lib/ofborg/checkouts";
        nix = {
          system = "x86_64-linux";
          remote = "daemon";
          build_timeout_seconds = 3600;
          initial_heap_size = "4g";
        };

        pastebin = {
          root = "$STATE_DIRECTORY/pastebins";
          db = "$STATE_DIRECTORY/db.json";
        };

        statcheck = {
          db = "$STATE_DIRECTORY/db.sqlite";
        };

        # We use Gerrit.
        vcs = "Gerrit";
        gerrit = {
          instance_uri = "cl.forkos.org";
          ssh_private_key_file = "$CREDENTIALS_DIRECTORY/gerrit-ssh-key";
          ssh_port = 29418;
        };
      };
    }
    (mkIf cfg.rabbitmq.enable {
      services.nginx.enable = true;
      services.rabbitmq = {
        enable = true;
        configItems = {
          "listeners.tcp" = "none";
          "listeners.ssl.default" = builtins.toString amqpPort;
          "ssl_options.certfile" = "${config.security.acme.certs.${amqpHost}.directory}/cert.pem";
          "ssl_options.keyfile" = "${config.security.acme.certs.${amqpHost}.directory}/key.pem";
        };
      };

      security.acme.certs.${amqpHost} = {
        webroot = "/var/lib/acme/.challenges";
        group = "rabbitmq";
      };
      services.nginx.virtualHosts.${amqpHost}.locations."/.well-known/acme-challenge".root =
        "/var/lib/acme/.challenges";
      systemd.services.rabbitmq.requires = ["acme-finished-${amqpHost}.target"];

      networking.firewall.allowedTCPPorts = [ amqpPort ];
    })
    (mkIf cfg.pastebin.enable {
      systemd.services.ofborg-pastebin = mkOfborgWorker "pastebin-worker" { };
    })
    (mkIf cfg.statcheck-worker.enable {
      systemd.services.ofborg-statcheck-worker = mkOfborgWorker "statcheck-worker" { };
    })
    (mkIf cfg.gerrit-events-streamer.enable {
      systemd.services.ofborg-gerrit-streamer = mkOfborgWorker "gerrit-events-streamer" { };
    })
    (mkIf cfg.mass-rebuilder.enable {
      systemd.services.ofborg-mass-rebuilder = mkOfborgWorker "mass-rebuilder" { };
    })
    (mkIf cfg.builder.enable {
      systemd.services.ofborg-builder = mkOfborgWorker "builder" { };
    })
    (mkIf cfg.stats.enable {
      systemd.services.ofborg-stats = mkOfborgWorker "stats" { };
    })
  ];
    # systemd.services.ofborg-log-message-collector = {};
    # systemd.services.ofborg-evaluation-filter = {};
    # systemd.services.ofborg-vcs-comment-filter = {};
    # systemd.services.ofborg-vcs-comment-poster = {};
}