{
  pkgs,
  lib,
  self,
}:

pkgs.testers.runNixOSTest {
  name = "arr-init-multiple-clients";

  nodes.machine =
    { pkgs, lib, ... }:
    {
      imports = [ self.nixosModules.default ];

      system.stateVersion = "24.11";

      virtualisation.memorySize = 4096;

      environment.systemPackages = with pkgs; [
        curl
        jq
        gnugrep
      ];

      # Mock qBittorrent on port 6011
      systemd.services.mock-qbittorrent =
        let
          mockQbitScript = pkgs.writeScript "mock-qbittorrent.py" ''
            import json
            from http.server import HTTPServer, BaseHTTPRequestHandler
            from urllib.parse import parse_qs, urlparse


            CATEGORIES = {
                "tv": {"name": "tv", "savePath": "/downloads"},
            }


            class QBitMock(BaseHTTPRequestHandler):
                def _respond(self, code=200, body=b"Ok.", content_type="text/plain"):
                    self.send_response(code)
                    self.send_header("Content-Type", content_type)
                    self.send_header("Set-Cookie", "SID=mock_session_id; Path=/")
                    self.end_headers()
                    self.wfile.write(body if isinstance(body, bytes) else body.encode())

                def do_GET(self):
                    path = self.path.split("?")[0]
                    if path == "/api/v2/app/webapiVersion":
                        self._respond(body=b"2.9.3")
                    elif path == "/api/v2/app/version":
                        self._respond(body=b"v5.0.0")
                    elif path == "/api/v2/torrents/info":
                        self._respond(body=b"[]", content_type="application/json")
                    elif path == "/api/v2/torrents/categories":
                        body = json.dumps(CATEGORIES).encode()
                        self._respond(body=body, content_type="application/json")
                    elif path == "/api/v2/app/preferences":
                        body = json.dumps({"save_path": "/tmp"}).encode()
                        self._respond(body=body, content_type="application/json")
                    else:
                        self._respond()

                def do_POST(self):
                    content_length = int(self.headers.get("Content-Length", 0))
                    body = self.rfile.read(content_length).decode()
                    path = urlparse(self.path).path
                    query = parse_qs(urlparse(self.path).query)
                    form = parse_qs(body)
                    params = {**query, **form}
                    if path == "/api/v2/torrents/createCategory":
                        name = params.get("category", [""])[0]
                        save_path = params.get("savePath", params.get("save_path", [""]))[0] or "/downloads"
                        if name:
                            CATEGORIES[name] = {"name": name, "savePath": save_path}
                    self._respond()

                def log_message(self, format, *args):
                    pass


            HTTPServer(("0.0.0.0", 6011), QBitMock).serve_forever()
          '';
        in
        {
          description = "Mock qBittorrent API";
          wantedBy = [ "multi-user.target" ];
          serviceConfig = {
            ExecStart = "${pkgs.python3}/bin/python3 ${mockQbitScript}";
            Type = "simple";
          };
        };

      # Mock SABnzbd on port 6012
      systemd.services.mock-sabnzbd =
        let
          mockSabScript = pkgs.writeScript "mock-sabnzbd.py" ''
            import json
            from http.server import HTTPServer, BaseHTTPRequestHandler
            from urllib.parse import parse_qs, urlparse


            class SabMock(BaseHTTPRequestHandler):
                def _respond(self, code=200, body=b'{"config": {}}', content_type="application/json"):
                    self.send_response(code)
                    self.send_header("Content-Type", content_type)
                    self.end_headers()
                    self.wfile.write(body if isinstance(body, bytes) else body.encode())

                def do_GET(self):
                    path = self.path.split("?")[0]
                    if "mode=config" in self.path or "mode=version" in self.path:
                        self._respond(body=b'{"config": {"misc": {"api_key": "test"}}, "version": "4.0.0"}')
                    elif "mode=get_config" in self.path:
                        self._respond(body=b'{"config": {"misc": {"complete_dir": "/downloads/usenet", "pre_check": false}, "categories": [{"name": "tv", "order": 0, "pp": "", "script": "Default", "dir": "tv"}], "sorters": []}}')
                    else:
                        self._respond()

                def do_POST(self):
                    self._respond()

                def log_message(self, format, *args):
                    pass


            HTTPServer(("0.0.0.0", 6012), SabMock).serve_forever()
          '';
        in
        {
          description = "Mock SABnzbd API";
          wantedBy = [ "multi-user.target" ];
          serviceConfig = {
            ExecStart = "${pkgs.python3}/bin/python3 ${mockSabScript}";
            Type = "simple";
          };
        };

      systemd.tmpfiles.rules = [
        "d /media/tv 0755 sonarr sonarr -"
      ];

      services.sonarr = {
        enable = true;
        dataDir = "/var/lib/sonarr/.config/NzbDrone";
        settings.server.port = lib.mkDefault 8989;
      };

      # Sonarr with TWO download clients: qBittorrent + SABnzbd
      services.arrInit.sonarr = {
        enable = true;
        serviceName = "sonarr";
        dataDir = "/var/lib/sonarr/.config/NzbDrone";
        port = 8989;
        downloadClients = [
          {
            name = "qBittorrent";
            implementation = "QBittorrent";
            configContract = "QBittorrentSettings";
            protocol = "torrent";
            fields = {
              host = "127.0.0.1";
              port = 6011;
              useSsl = false;
              tvCategory = "tv";
            };
          }
          {
            name = "SABnzbd";
            implementation = "Sabnzbd";
            configContract = "SabnzbdSettings";
            protocol = "usenet";
            fields = {
              host = "127.0.0.1";
              port = 6012;
              useSsl = false;
              apiKey = "test-api-key";
              tvCategory = "tv";
            };
          }
        ];
        rootFolders = [ "/media/tv" ];
      };
    };

  testScript = ''
    start_all()

    # Wait for mock services
    machine.wait_for_unit("mock-qbittorrent.service")
    machine.wait_for_unit("mock-sabnzbd.service")
    machine.wait_until_succeeds("curl -sf http://localhost:6011/api/v2/app/version", timeout=30)

    # Wait for Sonarr
    machine.wait_for_unit("sonarr.service")
    machine.wait_until_succeeds(
        "API_KEY=$(grep -oP '(?<=<ApiKey>)[^<]+' /var/lib/sonarr/.config/NzbDrone/config.xml) && "
        "curl -sf http://localhost:8989/api/v3/system/status -H \"X-Api-Key: $API_KEY\"",
        timeout=120,
    )

    # Trigger init
    machine.succeed("systemctl restart sonarr-init.service")
    machine.wait_for_unit("sonarr-init.service")

    # Verify both download clients exist
    result = machine.succeed(
        "API_KEY=$(grep -oP '(?<=<ApiKey>)[^<]+' /var/lib/sonarr/.config/NzbDrone/config.xml) && "
        "curl -sf http://localhost:8989/api/v3/downloadclient -H \"X-Api-Key: $API_KEY\" | "
        "jq '. | length'"
    ).strip()
    assert result == "2", f"Expected 2 Sonarr download clients, got {result}"

    # Verify qBittorrent client
    machine.succeed(
        "API_KEY=$(grep -oP '(?<=<ApiKey>)[^<]+' /var/lib/sonarr/.config/NzbDrone/config.xml) && "
        "curl -sf http://localhost:8989/api/v3/downloadclient -H \"X-Api-Key: $API_KEY\" | "
        "jq -e '.[] | select(.name == \"qBittorrent\")'"
    )

    # Verify SABnzbd client
    machine.succeed(
        "API_KEY=$(grep -oP '(?<=<ApiKey>)[^<]+' /var/lib/sonarr/.config/NzbDrone/config.xml) && "
        "curl -sf http://localhost:8989/api/v3/downloadclient -H \"X-Api-Key: $API_KEY\" | "
        "jq -e '.[] | select(.name == \"SABnzbd\")'"
    )

    # Idempotency test: restart init and verify still exactly 2 clients
    machine.succeed("systemctl restart sonarr-init.service")
    machine.wait_for_unit("sonarr-init.service")

    result = machine.succeed(
        "API_KEY=$(grep -oP '(?<=<ApiKey>)[^<]+' /var/lib/sonarr/.config/NzbDrone/config.xml) && "
        "curl -sf http://localhost:8989/api/v3/downloadclient -H \"X-Api-Key: $API_KEY\" | "
        "jq '. | length'"
    ).strip()
    assert result == "2", f"Expected 2 Sonarr download clients after idempotency test, got {result}"

    # Verify qBittorrent has correct configuration
    machine.succeed(
        "API_KEY=$(grep -oP '(?<=<ApiKey>)[^<]+' /var/lib/sonarr/.config/NzbDrone/config.xml) && "
        "curl -sf http://localhost:8989/api/v3/downloadclient -H \"X-Api-Key: $API_KEY\" | "
        "jq -e '.[] | select(.name == \"qBittorrent\") | .protocol == \"torrent\"'"
    )

    # Verify SABnzbd has correct configuration
    machine.succeed(
        "API_KEY=$(grep -oP '(?<=<ApiKey>)[^<]+' /var/lib/sonarr/.config/NzbDrone/config.xml) && "
        "curl -sf http://localhost:8989/api/v3/downloadclient -H \"X-Api-Key: $API_KEY\" | "
        "jq -e '.[] | select(.name == \"SABnzbd\") | .protocol == \"usenet\"'"
    )
  '';
}