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

let
  cfg = config.services.matrix-synapse;
  workers = lib.range 0 (cfg.federationReaders - 1);
  routes = [
    "~ ^/_matrix/federation/(v1|v2)/event/"
    "~ ^/_matrix/federation/(v1|v2)/state/"
    "~ ^/_matrix/federation/(v1|v2)/state_ids/"
    "~ ^/_matrix/federation/(v1|v2)/backfill/"
    "~ ^/_matrix/federation/(v1|v2)/get_missing_events/"
    "~ ^/_matrix/federation/(v1|v2)/publicRooms"
    "~ ^/_matrix/federation/(v1|v2)/query/"
    "~ ^/_matrix/federation/(v1|v2)/make_join/"
    "~ ^/_matrix/federation/(v1|v2)/make_leave/"
    "~ ^/_matrix/federation/(v1|v2)/send_join/"
    "~ ^/_matrix/federation/(v1|v2)/send_leave/"
    "~ ^/_matrix/federation/v1/make_knock/"
    "~ ^/_matrix/federation/v1/send_knock/"
    "~ ^/_matrix/federation/(v1|v2)/invite/"
    "~ ^/_matrix/federation/(v1|v2)/query_auth/"
    "~ ^/_matrix/federation/(v1|v2)/event_auth/"
    "~ ^/_matrix/federation/v1/timestamp_to_event/"
    "~ ^/_matrix/federation/(v1|v2)/exchange_third_party_invite/"
    "~ ^/_matrix/federation/(v1|v2)/user/devices/"
    "~ ^/_matrix/federation/(v1|v2)/get_groups_publicised$"
    "~ ^/_matrix/key/v2/query"
  ];
in
{
  config = lib.mkIf (cfg.federationReaders > 0) {
    services.matrix-synapse = {
      settings = {
        instance_map = lib.listToAttrs (
          lib.map (index: {
            name = "federation_reader-${toString index}";
            value = {
              path = "/run/matrix-synapse/federation_reader-${toString index}.sock";
            };
          }) workers
        );
      };

      workers = lib.listToAttrs (
        lib.map (index: {
          name = "federation_reader-${toString index}";
          value = {
            worker_app = "synapse.app.generic_worker";
            worker_listeners = [
              {
                type = "http";
                path = "/run/matrix-synapse/federation_reader-${toString index}.sock";
                resources = [
                  {
                    names = [ "replication" ];
                    compress = false;
                  }
                ];
              }
              {
                type = "http";
                path = "/run/matrix-synapse/federation_reader-federation-${toString index}.sock";
                mode = "666";
                resources = [
                  {
                    names = [ "federation" ];
                    compress = false;
                  }
                ];
              }
            ];
            database = (
              import ../db.nix {
                workerName = "federation_reader-${toString index}";
                dbGroup = "medium";
              }
            );
          };
        }) workers
      );
    };

    services.nginx.upstreams."federation_reader" = {
      extraConfig = ''
        keepalive 32;
        ip_hash;
      '';
      servers = lib.listToAttrs (
        lib.map (index: {
          name = "unix:/run/matrix-synapse/federation_reader-federation-${toString index}.sock";
          value = {
            max_fails = 0;
          };
        }) workers
      );
    };

    services.nginx.virtualHosts."${cfg.nginxVirtualHostName}".locations = lib.listToAttrs (
      lib.map (route: {
        name = route;
        value = {
          proxyPass = "http://federation_reader";
        };
      }) routes
    );
  };
}