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

let
  secrets = import ./secrets.nix;

  mastodon-lor-sh = pkgs.mastodon.override {
    srcOverride = pkgs.applyPatches {
      src = pkgs.fetchgit {
        url = "https://github.com/mastodon/mastodon.git";
        rev = "v${pkgs.mastodon.version}";
        # TODO get sha256 from nixpkgs/pkgs/servers/mastodon/source.nix
        sha256 = "1c0mxz45pkgmyw81z025n1ps1dkdq92337h7sd865w2fbgmzg50l";
      };
      patches =  [
        ./patches/logo.patch
        ./patches/app-icon.patch
        ./patches/logo-symbol-wordmark.patch
        ./patches/mascot.patch

        ./patches/add-tango-theme.patch
        ./patches/add-merveilles-theme.patch
        ./patches/add-black-theme.patch
        ./patches/themes-config.patch
        ./patches/fix-mastodon-light-highlight-color.patch

        ./patches/fix-character-limit.patch
        ./patches/max-toot-chars-api.patch

        ./patches/simple-form.patch
        ./patches/not-so-scary-500.patch
      ];
      postPatch = (import ./branding.nix { pkgs = pkgs; }).branding;
    };
  };

  sidekiq-manager = pkgs.writers.writePython3 "sidekiq-manager" {} ''
    from itertools import permutations
    from subprocess import Popen


    def sidekiq(queues, connections=16):
        mastodon = "${mastodon-lor-sh}"
        cmd = [f"{mastodon}/bin/sidekiq", "-r", mastodon]
        cmd += ["-c", f"{connections}"]
        for q in queues:
            cmd += ['-q', q]
        return Popen(cmd)


    procs = [sidekiq(['mailers', 'pull', 'scheduler'])]

    queues = ['default', 'push', 'ingress']
    procs += [sidekiq(qs) for qs in permutations(queues)]

    for p in procs:
        p.wait()
  '';

  s3cmd = pkgs.writeShellScript "s3cmd" ''
    ${pkgs.s3cmd}/bin/s3cmd \
      --access_key='${secrets.backup.accessKey}' \
      --secret_key='${secrets.backup.secretKey}' \
      --host='${secrets.backup.host}' \
      --host-bucket='${secrets.backup.hostBucket}' \
      $@
  '';

  auth = pkgs.buildGoModule rec {
    name = "auth";
    src = ./auth;
    vendorHash = "sha256-cLn1tZL+LVMmSpLZYA7uRkEW7eFWGf+NFdvBEvQtjH4=";
  };

  bucket = secrets.backup.bucket;

  domainName = "lor.sh";
in {
  systemd.services."mastodon-auth" = {
    wantedBy = [ "multi-user.target" ];
    after = [ "network.target" ];
    environment = {
      SOCKET = "/var/run/mastodon-auth/auth.socket";
      DATABASE = "mastodon";
      AUTH_SECRET = secrets.authSecret;
    };
    serviceConfig = {
      Restart = "always";
      RestartSec = 30;
      ExecStart = "${auth}/bin/auth";
      User = "mastodon";
      RuntimeDirectory = "mastodon-auth";
      RuntimeDirectoryMode = "0750";
    };
  };

  services.postgresqlBackup = {
    enable = true;
    databases = [ "mastodon" ];
    compression = "gzip";
  };

  systemd.services.postgresqlBackup-mastodon.serviceConfig.ExecStartPost =
    pkgs.writeShellScript "backup-to-s3" ''
      cd /var/backup/postgresql

      ${pkgs.gnupg}/bin/gpg --batch --passphrase '${secrets.backup.password}' \
                            --symmetric mastodon.sql.gz

      ${s3cmd} rm ${bucket}/mastodon.prev.sql.gz.gpg
      ${s3cmd} mv ${bucket}/mastodon.sql.gz.gpg ${bucket}/mastodon.prev.sql.gz.gpg
      ${s3cmd} put mastodon.sql.gz.gpg ${bucket}/

      rm mastodon.sql.gz.gpg
    '';

  # Until merge of https://github.com/NixOS/nixpkgs/pull/202408
  systemd.services.mastodon-sidekiq.serviceConfig.ExecStart =
    lib.mkForce "${sidekiq-manager}";

  # https://github.com/mperham/sidekiq/wiki/Memory#bloat
  systemd.services.mastodon-sidekiq.environment.MALLOC_ARENA_MAX = "2";

  services.caddy = {
    enable = true;
    virtualHosts."${domainName}".extraConfig = ''
      root * ${mastodon-lor-sh}/public
      encode gzip

      @static file
      handle @static {
          file_server
      }

      handle /api/v1/streaming* {
          reverse_proxy unix//run/mastodon-streaming/streaming.socket
      }

      handle /api/v0/auth* {
          reverse_proxy unix//run/mastodon-auth/auth.socket
      }

      handle {
          reverse_proxy unix//run/mastodon-web/web.socket
      }

      header {
          Strict-Transport-Security "max-age=31536000;"
      }

      @5xx expression `{err.status_code} >= 500 && {err.status_code} < 600`
      handle_errors {
          rewrite @5xx /500.html
          file_server
      }
    '';
  };

  users.users.caddy.extraGroups = [ "mastodon" ];

  services.mastodon = {
    enable = true;

    package = mastodon-lor-sh;

    localDomain = "${domainName}";
    configureNginx = false;

    smtp = {
      createLocally = false;
      authenticate = true;
      host = "smtp.eu.mailgun.org";
      port = 587;
      fromAddress = "Mastodon <mastodon@m.${domainName}>";
      user = "mastodon@m.${domainName}";
      passwordFile = builtins.toFile "smtp-password" secrets.smtpPassword;
    };

    vapidPublicKeyFile = builtins.toFile "vapidPublicKey" secrets.vapidPublicKey;
    secretKeyBaseFile = builtins.toFile "secretKeyBase" secrets.secretKeyBase;
    otpSecretFile = builtins.toFile "otpSecret" secrets.otpSecret;
    vapidPrivateKeyFile = builtins.toFile "vapidPrivateKey" secrets.vapidPrivateKey;

    extraConfig = {
      S3_ENABLED = "true";
      S3_PROTOCOL = "https";
      S3_BUCKET = "lor-sh";
      S3_REGION = "eu-central-1";
      S3_HOSTNAME = "s3.eu-central-1.wasabisys.com";
      S3_ENDPOINT = "https://s3.eu-central-1.wasabisys.com/lor-sh";
      S3_ALIAS_HOST = "s3.eu-central-1.wasabisys.com/lor-sh/lor-sh";
      AWS_ACCESS_KEY_ID = secrets.AWS_ACCESS_KEY_ID;
      AWS_SECRET_ACCESS_KEY = secrets.AWS_SECRET_ACCESS_KEY;

      DEEPL_API_KEY = secrets.DEEPL_API_KEY;
      DEEPL_PLAN = "pro";
    };
  };
}