{ pkgs, lib, config, ... }:
let
  cfg = config.modules.services.immich;
  fqdn = "${cfg.subdomain}.${config.networking.domain}";

  volumeServices = names: (
    lib.lists.foldl
      (services: name:
        services // {
          "podman-volume-immich_${name}" = {
            path = [ pkgs.podman ];
            serviceConfig = {
              Type = "oneshot";
              RemainAfterExit = true;
            };
            script = ''
              podman volume inspect immich_${name} || podman volume create immich_${name}
            '';
            partOf = [ "podman-compose-immich-root.target" ];
            wantedBy = [ "podman-compose-immich-root.target" ];
          };
        }
      )
      { }
      names
  );

  containerServices = services: (
    lib.lists.foldl
      (acc: { name, volumes ? [ ], ... }:
        let
          volume_services = map (volume: "podman-volume-immich_${volume}.service") volumes;
          dependent_services = [ "podman-network-immich_default.service" ] ++ volume_services;
        in

        acc // {
          "podman-immich_${name}" = {
            serviceConfig = {
              Restart = lib.mkOverride 500 "always";
            };
            after = dependent_services;
            requires = dependent_services;
            partOf = [
              "podman-compose-immich-root.target"
            ];
            wantedBy = [
              "podman-compose-immich-root.target"
            ];
          };
        }
      )
      { }
      services
  );
in
{
  options.modules.services.immich = {
    enable = lib.mkEnableOption "Enable Immich";
    subdomain = lib.mkOption {
      type = lib.types.str;
    };
    version = lib.mkOption {
      type = lib.types.str;
      default = "latest";
    };
    port = lib.mkOption {
      type = lib.types.int;
      default = 2283;
    };
    dataDir = lib.mkOption {
      type = lib.types.str;
    };
    storageDirs = lib.mkOption {
      type = lib.types.listOf lib.types.str;
      default = [ ];
    };
  };

  config = lib.mkIf cfg.enable
    {
      virtualisation.podman = {
        enable = true;
        autoPrune.enable = true;
        dockerCompat = true;
        defaultNetwork.settings = {
          # Required for container networking to be able to use names.
          dns_enabled = true;
        };
      };

      virtualisation.oci-containers.backend = "podman";

      networking.firewall.trustedInterfaces = [ "podman1" ];
      modules.firewall.interfaces.podman1 = [ "dns" ];

      # Containers
      virtualisation.oci-containers.containers = {
        "immich_machine_learning" = {
          image = "ghcr.io/immich-app/immich-machine-learning:${cfg.version}";
          environmentFiles = [
            "/var/secrets/immich.env"
          ];
          volumes = [
            "immich_model_cache:/cache:rw"
          ];
          log-driver = "journald";
          extraOptions = [
            "--network-alias=immich-machine-learning"
            "--network=immich_default"
          ];
        };

        "immich_postgres" = {
          image = "registry.hub.docker.com/tensorchord/pgvecto-rs:pg14-v0.2.0";
          environmentFiles = [
            "/var/secrets/immich.env"
          ];
          environment = {
            POSTGRES_INITDB_ARGS = "--data-checksums";
          };
          volumes = [
            "immich_db_data:/var/lib/postgresql/data:rw"
          ];
          cmd = [ "postgres" "-c" "shared_preload_libraries=vectors.so" "-c" "search_path=\"$user\", public, vectors" "-c" "logging_collector=on" "-c" "max_wal_size=2GB" "-c" "shared_buffers=512MB" "-c" "wal_compression=on" ];
          log-driver = "journald";
          extraOptions = [
            "--network-alias=database"
            "--network=immich_default"
          ];
        };

        "immich_redis" = {
          image = "registry.hub.docker.com/library/redis:6.2-alpine";
          environmentFiles = [
            "/var/secrets/immich.env"
          ];
          log-driver = "journald";
          extraOptions = [
            "--network-alias=redis"
            "--network=immich_default"
          ];
        };

        "immich_server" = {
          image = "ghcr.io/immich-app/immich-server:${cfg.version}";
          environmentFiles = [
            "/var/secrets/immich.env"
          ];
          volumes = [
            "/etc/localtime:/etc/localtime:ro"
            "${cfg.dataDir}:/usr/src/app/upload:rw"
          ] ++ map (dir: "${dir}:${dir}:ro") cfg.storageDirs;
          ports = [
            "${toString cfg.port}:2283/tcp"
          ];
          dependsOn = [
            "immich_postgres"
            "immich_redis"
          ];
          log-driver = "journald";
          extraOptions = [
            "--network-alias=immich-server"
            "--network=immich_default"
          ];
        };
      };

      systemd.services = (containerServices [
        { name = "machine_learning"; volumes = [ "model_cache" ]; }
        { name = "postgres"; volumes = [ "db_data" ]; }
        { name = "redis"; }
        { name = "server"; }
      ]) // {
        # Networks
        "podman-network-immich_default" = {
          path = [ pkgs.podman ];
          serviceConfig = {
            Type = "oneshot";
            RemainAfterExit = true;
            ExecStop = "${pkgs.podman}/bin/podman network rm -f immich_default";
          };
          script = ''
            podman network inspect immich_default || podman network create immich_default
          '';
          partOf = [ "podman-compose-immich-root.target" ];
          wantedBy = [ "podman-compose-immich-root.target" ];
        };
      } // (volumeServices [
        "db_data"
        "model_cache"
      ]);

      # Root service
      # When started, this will automatically create all resources and start
      # the containers. When stopped, this will teardown all resources.
      systemd.targets."podman-compose-immich-root" = {
        unitConfig = {
          Description = "Root target generated by compose2nix.";
        };
        wantedBy = [ "multi-user.target" ];
      };

      modules.services.webserver = {
        enable = lib.mkDefault true;
        vHosts.${fqdn}.locations."/".proxyPort = cfg.port;
      };
    };
}