{ config, lib, ... }:

with lib;
let
  turnRange = with config.services.coturn; [{
    from = min-port;
    to = max-port;
  }];

  cfg = config.modules.services.coturn;
in
{
  options.modules.services.coturn = {
    enable = mkEnableOption "coturn";
    domain = mkOption { type = types.str; default = config.networking.hostName; };
    shared_secret = mkOption { type = types.str; };
    tls.acmeHost = mkOption { type = types.str; default = cfg.domain; };
  };

  config = mkIf cfg.enable {
    services.coturn = {
      enable = true;
      use-auth-secret = true;
      static-auth-secret = cfg.shared_secret;
      realm = cfg.domain;
      cert = "${config.security.acme.certs.${cfg.tls.acmeHost}.directory}/fullchain.pem";
      pkey = "${config.security.acme.certs.${cfg.tls.acmeHost}.directory}/key.pem";

      no-tcp-relay = true;
      no-cli = true;

      extraConfig = ''
        user-quota=12
        total-quota=1200

        no-loopback-peers
        no-multicast-peers
        denied-peer-ip=0.0.0.0-0.255.255.255
        denied-peer-ip=10.0.0.0-10.255.255.255
        denied-peer-ip=100.64.0.0-100.127.255.255
        denied-peer-ip=127.0.0.0-127.255.255.255
        denied-peer-ip=169.254.0.0-169.254.255.255
        denied-peer-ip=172.16.0.0-172.31.255.255
        denied-peer-ip=192.0.0.0-192.0.0.255
        denied-peer-ip=192.0.2.0-192.0.2.255
        denied-peer-ip=192.88.99.0-192.88.99.255
        denied-peer-ip=192.168.0.0-192.168.255.255
        denied-peer-ip=198.18.0.0-198.19.255.255
        denied-peer-ip=198.51.100.0-198.51.100.255
        denied-peer-ip=203.0.113.0-203.0.113.255
        denied-peer-ip=240.0.0.0-255.255.255.255
      '';
    };

    systemd.services.coturn = {
      serviceConfig.SupplementaryGroups = [ "acme" ];
    };

    networking.firewall.allowedUDPPortRanges = turnRange;
    networking.firewall.allowedTCPPortRanges = turnRange;
    networking.firewall.allowedTCPPorts = [ 3478 3479 5349 5350 ];
    networking.firewall.allowedUDPPorts = [ 3478 3479 5349 5350 ];
  };
}