nixos/servers/immich.nix

{ lib, pkgs, config, ... }:
let
  cfg = config.services.immich;

  # External domain for Immich
  fqdn = "photos.symbiotrip.com";

  # Immich service port (default)
  immichPort = 2283;

  # Immich media storage location
  mediaLocation = "/var/lib/immich/media";

  # Borg backup repository path
  borgRepo = "/var/backups/immich-borg";

in

{
  # DNS-based ACME certificate configuration
  # Uses defaults (dnsProvider, email, credentials) from nginx.nix
  security.acme.certs.${fqdn} = {
    # Group needs to be set so nginx can read the certificate
    group = config.services.nginx.group;

    # Inherit DNS challenge configuration from security.acme.defaults (set in nginx.nix)
    # This includes: dnsProvider = "cloudflare", environmentFile with Cloudflare token, email

    # Explicitly ensure DNS mode (not HTTP-01)
    webroot = null;
  };

  # Nginx reverse proxy for Immich
  services.nginx.virtualHosts.${fqdn} = {
    # Use DNS-based ACME certificate instead of HTTP-01 challenge
    enableACME = false;
    useACMEHost = fqdn;
    forceSSL = true;

    extraConfig = ''
      # Large upload limit for photos and videos (50GB max)
      client_max_body_size 50000M;

      # Proxy headers
      proxy_set_header Host $host;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

      # Extended timeouts for large file uploads
      client_body_timeout 600s;
      client_header_timeout 600s;
      proxy_read_timeout   600s;
      proxy_send_timeout   600s;
      send_timeout         600s;

      # Logging for debugging
      access_log /var/log/nginx/${fqdn}-access.log;
      error_log /var/log/nginx/${fqdn}-error.log warn;
    '';

    locations."/" = {
      proxyPass = "http://localhost:${toString immichPort}";
      proxyWebsockets = true;
      recommendedProxySettings = true;

      # Extra websocket configuration
      extraConfig = ''
        # WebSocket upgrade headers
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
      '';
    };
  };

  # Immich service configuration (NixOS native)
  services.immich = {
    enable = true;

    # Bind to localhost only - nginx handles public HTTPS
    host = "127.0.0.1";
    port = immichPort;

    # Media storage location
    mediaLocation = mediaLocation;

    # Firewall - nginx handles external access
    openFirewall = false;
  };

  # Hardware acceleration for video transcoding
  # This leverages Intel Quick Sync Video on the NUC's Intel GPU
  services.immich.accelerationDevices = null;

  # Enable graphics acceleration
  hardware.graphics = {
    enable = true;
    enable32Bit = true;
    extraPackages = with pkgs; [
      intel-media-driver  # Intel Quick Sync Video support
    ];
  };

  # Add immich user to video and render groups for GPU access
  users.users.immich.extraGroups = [ "video" "render" ];

  # Ensure nginx starts after ACME certificate is available
  systemd.services.nginx = {
    after = [ "acme-${fqdn}.service" "acme-${fqdn}-renew.service" ];
    requires = [ "acme-${fqdn}.service" ];
  };

  # PostgreSQL database backups for Immich
  services.postgresqlBackup = {
    enable = true;
    databases = [ "immich" ];
    location = "/var/backups/postgresql/immich";
    startAt = "daily";
    compression = "zstd";
  };

  # Borgbackup for Immich media files
  # Manual repository initialization required:
  # sudo -u borg borg init --encryption=repokey-blake2 ${borgRepo}
  services.borgbackup.jobs."immich" = {
    paths = [ mediaLocation ];
    repo = borgRepo;

    # Run backup daily at 3 AM
    startAt = "*-*-* 03:00:00";

    compression = "auto,zstd,6";
    encryption.mode = "none";  # Repository handles encryption

    prune = {
      keep = {
        within = "1d";    # Keep all backups from the last day
        daily = 7;        # Keep last 7 daily backups
        weekly = 4;       # Keep last 4 weekly backups
        monthly = 6;      # Keep last 6 monthly backups
      };
    };
  };

  # Create borg backup directory with proper permissions
  system.activationScripts.immich-borg-dir = ''
    mkdir -p ${borgRepo}
    chown -R borg:borg ${borgRepo}
    chmod 700 ${borgRepo}
  '';

  # Create Immich media directory with proper permissions
  system.activationScripts.immich-media-dir = ''
    mkdir -p ${mediaLocation}
    chown -R immich:immich ${mediaLocation}
    chmod 755 ${mediaLocation}
  '';

  # Systemd service to monitor disk usage
  services.prometheus.exporters.node = {
    enable = true;
    enabledCollectors = [ "systemd" "textfile" "filesystem" ];
    port = 9100;
  };
}