inputs:
{
  options.nixos.services = let inherit (inputs.lib) mkOption types; in
  {
    synapse =
    {
      enable = mkOption { type = types.bool; default = false; };
      port = mkOption { type = types.ints.unsigned; default = 8008; };
      hostname = mkOption { type = types.str; default = "synapse.chn.moe"; };
    };
    synapse-proxy = mkOption
    {
      type = types.attrsOf (types.submodule (submoduleInputs: { options =
      {
        hostname = mkOption { type = types.str; default = submoduleInputs.config._module.args.name; };
      };}));
      default = {};
    };
  };
  config =
    let
      inherit (inputs.config.nixos.services) synapse synapse-proxy;
      inherit (inputs.localLib) attrsToList;
      inherit (inputs.lib) mkIf mkMerge;
      inherit (builtins) map listToAttrs;
    in mkMerge
    [
      (mkIf synapse.enable
      {
        services.matrix-synapse =
        {
          enable = true;
          settings =
          {
            server_name = synapse.hostname;
            listeners =
            [{
              bind_addresses = [ "127.0.0.1" ];
              port = 8008;
              resources = [{ names = [ "client" "federation" ]; compress = false; }];
              tls = false;
              type = "http";
              x_forwarded = true;
            }];
            database =
            {
              name = "psycopg2";
              args =
              {
                user = "synapse";
                database = "synapse";
                host = "127.0.0.1";
                port = "5432";
              };
            };
            admin_contact = "mailto:chn@chn.moe";
            enable_registration = true;
            registrations_require_3pid = [ "email" ];
            turn_uris = [ "turns:coturn.chn.moe" "turn:coturn.chn.moe" ];
            max_upload_size = "1024M";
            web_client_location = "https://element.chn.moe/";
            serve_server_wellknown = true;
            report_stats = true;
            trusted_key_servers = [{ server_name = "matrix.org"; }];
            suppress_key_server_warning = true;
            log_config = (inputs.pkgs.formats.yaml {}).generate "log.yaml"
            {
              version = 1;
              formatters.precise.format =
                "%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s - %(message)s";
              handlers.console = { class = "logging.StreamHandler"; formatter = "precise"; };
              root = { level = "INFO"; handlers = [ "console" ]; };
              disable_existing_loggers = true;
            };
          };
          extraConfigFiles = [ inputs.config.sops.templates."synapse/password.yaml".path ];
        };
        sops =
        {
          templates."synapse/password.yaml" =
          {
            owner = inputs.config.systemd.services.matrix-synapse.serviceConfig.User;
            group = inputs.config.systemd.services.matrix-synapse.serviceConfig.Group;
            content = builtins.readFile ((inputs.pkgs.formats.yaml {}).generate "password.yaml"
            {
              database =
              {
                name = "psycopg2";
                args =
                {
                  user = "synapse";
                  password = inputs.config.sops.placeholder."postgresql/synapse";
                  database = "synapse";
                  host = "127.0.0.1";
                  port = "5432";
                };
                allow_unsafe_locale = true;
              };
              turn_shared_secret = inputs.config.sops.placeholder."synapse/coturn";
              registration_shared_secret = inputs.config.sops.placeholder."synapse/registration";
              macaroon_secret_key = inputs.config.sops.placeholder."synapse/macaroon";
              form_secret = inputs.config.sops.placeholder."synapse/form";
              signing_key_path = inputs.config.sops.secrets."synapse/signing-key".path;
              email =
              {
                smtp_host = "mail.chn.moe";
                smtp_port = 25;
                smtp_user = "bot@chn.moe";
                smtp_pass = inputs.config.sops.placeholder."mail/bot";
                require_transport_security = true;
                notif_from = "Your Friendly %(app)s homeserver <bot@chn.moe>";
                app_name = "Haonan Chen's synapse";
              };
            });
          };
          secrets = (listToAttrs (map
            (secret: { name = "synapse/${secret}"; value = {}; })
            [ "coturn" "registration" "macaroon" "form" ]))
            // { "synapse/signing-key".owner = inputs.config.systemd.services.matrix-synapse.serviceConfig.User; }
            // { "mail/bot" = {}; };
        };
        nixos.services =
        {
          nginx =
          {
            enable = true;
            httpProxy =
            {
              "${synapse.hostname}" =
              {
                upstream = "http://127.0.0.1:${toString synapse.port}";
                websocket = true;
                setHeaders.Host = synapse.hostname;
              };
              "direct.${synapse.hostname}" =
              {
                upstream = "http://127.0.0.1:${toString synapse.port}";
                websocket = true;
                setHeaders.Host = synapse.hostname;
                detectAuth = true;
              };
            };
          };
          postgresql = { enable = true; instances.synapse = {}; };
        };
      })
      (mkIf (synapse-proxy != {})
      {
        nixos.services.nginx =
        {
          enable = true;
          httpProxy = listToAttrs (map
            (proxy:
            {
              name = proxy.value.hostname;
              value =
              {
                upstream = "https://direct.${proxy.value.hostname}";
                websocket = true;
                setHeaders.Host = "direct.${proxy.value.hostname}";
                addAuth = true;
              };
            })
            (attrsToList synapse-proxy));
        };
      })
    ];
}