# services/frigate.nix — Local NVR with AI object detection
# Consumes go2rtc streams; no MQTT / Home Assistant dependency.
# Authentication delegated to Authelia by hijacking the /auth location
# that the upstream Frigate module bakes into every nginx location block.
{ config, lib, ... }:
{
  config = lib.mkIf (config.networking.hostName == "FredOS-Mediaserver") {

    services.frigate = {
      enable = true;
      hostname = "frigate.nordhammer.it";

      settings = {
        mqtt.enabled = false;

        # Delegate authentication to Authelia via reverse proxy headers.
        # The nginx /auth location sends requests to Authelia, which returns
        # Remote-User on success. Frigate picks this up via proxy header_map.
        auth.proxy.header_map.user = "Remote-User";

        cameras.kids_bedroom = {
          enabled = true;
          ffmpeg.inputs = [{
            path = "rtsp://127.0.0.1:8554/kids_bedroom";
            roles = [ "detect" "record" ];
          }];
          detect = {
            enabled = true;
            width = 1920;
            height = 1080;
          };
        };

        record = {
          enabled = true;
          retain = {
            days = 7;
            mode = "motion";
          };
        };

        snapshots = {
          enabled = true;
          retain.default = 14;
        };
      };
    };

    services.nginx.virtualHosts."frigate.nordhammer.it" = {
      useACMEHost = "nordhammer.it";
      forceSSL = true;

      # The Frigate module puts `auth_request /auth` on every location.
      # Override that internal /auth location to verify via Authelia
      # instead of Frigate's built-in auth, so one login covers everything.
      locations."/auth" = lib.mkForce {
        proxyPass = "http://127.0.0.1:9091/api/verify";
        extraConfig = ''
          internal;
          proxy_pass_request_body off;
          proxy_set_header Content-Length "";
          proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
          proxy_set_header X-Forwarded-Method $request_method;
          proxy_set_header X-Forwarded-Proto $scheme;
          proxy_set_header X-Forwarded-Host $http_host;
          proxy_set_header X-Forwarded-Uri $request_uri;
          proxy_set_header X-Forwarded-For $remote_addr;
        '';
      };

      # Redirect 401 → Authelia login portal
      extraConfig = lib.mkAfter ''
        error_page 401 =302 https://auth.nordhammer.it/?rd=$scheme://$http_host$request_uri;
      '';
    };

    # GPU access for hardware-accelerated ffmpeg decoding
    users.users.frigate.extraGroups = [ "video" "render" ];
  };
}