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

let
  cfg = config.my.services.unifi;
  allowedRules = {
    # https://help.ubnt.com/hc/en-us/articles/218506997
    allowedTCPPorts = [
      8080 # Port for UAP to inform controller.
      8880 # Port for HTTP portal redirect, if guest portal is enabled.
      8843 # Port for HTTPS portal redirect, ditto.
      6789 # Port for UniFi mobile speed test.
      9130 # Port for the prometheus exporter
    ];
    allowedUDPPorts = [
      3478 # UDP port used for STUN.
      10001 # UDP port used for device discovery.
    ];
  };
in {
  options.my.services.unifi = with lib; {
    enable = mkEnableOption "Unifi controller";
  };

  config = lib.mkIf cfg.enable {
    networking.firewall = allowedRules;
    users.users.unifi.group = "unifi";
    users.users.unifi.isSystemUser = true;
    users.groups.unifi = { };

    services.unifi = {
      enable = true;
      openPorts = true;
      unifiPackage = pkgs.unifiStable;
    };

    age.secrets.unifi-read-only = {
      file = ../../../secrets/unifi/unifi-poller.age;
      mode = "0400";
      owner = "unifi-poller";
    };

    services.unifi-poller = {
      enable = true;

      unifi.defaults = {
        url = "https://127.0.0.1:8443";
        user = "unifipoller";
        pass = config.age.secrets.unifi-read-only.path;

        verify_ssl = false;
      };

      influxdb.disable = true;

      prometheus = { http_listen = ":9130"; };
    };

    systemd.services.unifi-available = {
      description = "Wait for Unifi to be available";
      after = [ "unifi.service" ];
      before = [ "unifi-poller.service" ];
      wantedBy = [ "unifi-poller.service" ];
      serviceConfig = {
        ExecStart =
          "${pkgs.curl}/bin/curl --insecure 'https://localhost:8443/'";
        Restart = "on-failure";
        RestartSec = "10";
        Type = "oneshot";
      };
    };

    age.secrets.restic-repo-systems.file =
      ../../../secrets/restic/repo-systems.age;

    services.restic.backups = {
      unifi = {
        paths = [ "/var/lib/unifi" ];
        repository = "/data/slow/backups/systems";
        passwordFile = config.age.secrets.restic-repo-systems.path;
        initialize = true;
        timerConfig = { OnCalendar = "00:45"; };
        extraBackupArgs = [ "--tag unifi" ];
        pruneOpts = [ "--keep-daily 7" "--keep-weekly 4" ];
      };
    };
  };
}