// Copyright (c) 2026 Gordon Bolton. MIT License.
const RTorrentClient = require('../../../server/clients/RTorrentClient');
const xmlrpc = require('xmlrpc');

jest.mock('xmlrpc', () => ({
  createClient: jest.fn()
}));

jest.mock('../../../server/utils/logger', () => ({
  logToFile: jest.fn()
}));

describe('RTorrentClient', () => {
  let client;
  let mockConfig;
  let mockMethodCall;

  beforeEach(() => {
    mockMethodCall = jest.fn();
    xmlrpc.createClient.mockReturnValue({
      methodCall: mockMethodCall
    });

    mockConfig = {
      id: 'test-rtorrent',
      name: 'Test rTorrent',
      url: 'http://localhost:8080',
      username: 'rtorrent',
      password: 'rtorrent'
    };

    client = new RTorrentClient(mockConfig);
    jest.clearAllMocks();
  });

  describe('Constructor', () => {
    it('should initialize with correct properties', () => {
      expect(client.getClientType()).toBe('rtorrent');
      expect(client.getInstanceId()).toBe('test-rtorrent');
      expect(client.name).toBe('Test rTorrent');
      expect(client.url).toBe('http://localhost:8080');
    });

    it('should create xmlrpc client with exact URL from config (no auto-append)', () => {
      expect(xmlrpc.createClient).toHaveBeenCalledWith({
        url: 'http://localhost:8080',
        headers: {
          Authorization: `Basic ${Buffer.from('rtorrent:rtorrent').toString('base64')}`
        }
      });
    });

    it('should create xmlrpc client without auth when no credentials', () => {
      xmlrpc.createClient.mockClear();
      const noAuthConfig = {
        id: 'test-rtorrent-noauth',
        name: 'Test rTorrent No Auth',
        url: 'http://localhost:8080/RPC2'
      };
      new RTorrentClient(noAuthConfig);
      expect(xmlrpc.createClient).toHaveBeenCalledWith({
        url: 'http://localhost:8080/RPC2'
      });
    });

    it('should use whatbox.ca-style /xmlrpc path exactly as configured', () => {
      xmlrpc.createClient.mockClear();
      const whatboxConfig = {
        id: 'test-whatbox',
        name: 'Whatbox',
        url: 'https://user.whatbox.ca/xmlrpc',
        username: 'user',
        password: 'pass'
      };
      new RTorrentClient(whatboxConfig);
      expect(xmlrpc.createClient).toHaveBeenCalledWith({
        url: 'https://user.whatbox.ca/xmlrpc',
        headers: {
          Authorization: `Basic ${Buffer.from('user:pass').toString('base64')}`
        }
      });
    });

    it('should use custom RPC path exactly as configured', () => {
      xmlrpc.createClient.mockClear();
      const customConfig = {
        id: 'test-custom',
        name: 'Custom',
        url: 'https://example.com/custom/rpc/path'
      };
      new RTorrentClient(customConfig);
      expect(xmlrpc.createClient).toHaveBeenCalledWith({
        url: 'https://example.com/custom/rpc/path'
      });
    });
  });

  describe('Connection Test', () => {
    it('should test connection successfully', async () => {
      mockMethodCall.mockImplementation((method, params, callback) => {
        callback(null, '0.9.8');
      });

      const result = await client.testConnection();

      expect(result).toBe(true);
      expect(mockMethodCall).toHaveBeenCalledWith(
        'system.client_version',
        [],
        expect.any(Function)
      );
    });

    it('should handle connection test failure', async () => {
      mockMethodCall.mockImplementation((method, params, callback) => {
        callback(new Error('Connection refused'));
      });

      const result = await client.testConnection();

      expect(result).toBe(false);
    });
  });

  describe('getActiveDownloads', () => {
    it('should fetch and normalize torrents', async () => {
      const mockTorrents = [
        [
          'abc123def456',
          'Test Torrent 1',
          1000000000,
          750000000,
          1048576,
          0,
          1,
          1,
          0,
          '/downloads/test',
          'movies'
        ],
        [
          'def789abc012',
          'Test Torrent 2',
          2000000000,
          2000000000,
          0,
          512000,
          1,
          1,
          0,
          '/downloads/complete',
          'tv'
        ]
      ];

      mockMethodCall.mockImplementation((method, params, callback) => {
        callback(null, mockTorrents);
      });

      const downloads = await client.getActiveDownloads();

      expect(downloads).toHaveLength(2);
      expect(downloads[0].id).toBe('abc123def456');
      expect(downloads[0].title).toBe('Test Torrent 1');
      expect(downloads[0].status).toBe('Downloading');
      expect(downloads[0].progress).toBe(75);
      expect(downloads[0].category).toBe('movies');
      expect(downloads[1].status).toBe('Seeding');
      expect(downloads[1].category).toBe('tv');
    });

    it('should handle empty torrent list', async () => {
      mockMethodCall.mockImplementation((method, params, callback) => {
        callback(null, []);
      });

      const downloads = await client.getActiveDownloads();

      expect(downloads).toEqual([]);
    });

    it('should handle XML-RPC errors gracefully', async () => {
      mockMethodCall.mockImplementation((method, params, callback) => {
        callback(new Error('XML-RPC fault'));
      });

      const downloads = await client.getActiveDownloads();

      expect(downloads).toEqual([]);
    });
  });

  describe('normalizeDownload', () => {
    it('should normalize a downloading torrent', () => {
      const torrent = [
        'hash123',
        'Downloading Torrent',
        1000000000,
        500000000,
        1048576,
        0,
        1,
        1,
        0,
        '/downloads',
        ''
      ];

      const normalized = client.normalizeDownload(torrent);

      expect(normalized).toEqual({
        id: 'hash123',
        title: 'Downloading Torrent',
        type: 'torrent',
        client: 'rtorrent',
        instanceId: 'test-rtorrent',
        instanceName: 'Test rTorrent',
        status: 'Downloading',
        progress: 50,
        size: 1000000000,
        downloaded: 500000000,
        speed: 1048576,
        eta: 476,
        category: undefined,
        tags: [],
        savePath: '/downloads',
        addedOn: undefined,
        arrQueueId: undefined,
        arrType: undefined,
        raw: torrent
      });
    });

    it('should normalize a seeding torrent', () => {
      const torrent = [
        'hash456',
        'Seeding Torrent',
        500000000,
        500000000,
        0,
        204800,
        1,
        1,
        0,
        '/downloads/complete',
        'movies'
      ];

      const normalized = client.normalizeDownload(torrent);

      expect(normalized.status).toBe('Seeding');
      expect(normalized.progress).toBe(100);
      expect(normalized.speed).toBe(204800);
      expect(normalized.eta).toBeNull();
      expect(normalized.category).toBe('movies');
      expect(normalized.tags).toEqual(['movies']);
    });

    it('should normalize a paused torrent', () => {
      const torrent = [
        'hash789',
        'Paused Torrent',
        1000000000,
        250000000,
        0,
        0,
        1,
        0,
        0,
        '/downloads',
        ''
      ];

      const normalized = client.normalizeDownload(torrent);

      expect(normalized.status).toBe('Paused');
      expect(normalized.speed).toBe(0);
      expect(normalized.eta).toBeNull();
    });

    it('should normalize a stopped torrent', () => {
      const torrent = [
        'hashabc',
        'Stopped Torrent',
        1000000000,
        0,
        0,
        0,
        0,
        0,
        0,
        '/downloads',
        ''
      ];

      const normalized = client.normalizeDownload(torrent);

      expect(normalized.status).toBe('Stopped');
    });

    it('should normalize a checking torrent', () => {
      const torrent = [
        'hashdef',
        'Checking Torrent',
        1000000000,
        500000000,
        0,
        0,
        1,
        0,
        1,
        '/downloads',
        ''
      ];

      const normalized = client.normalizeDownload(torrent);

      expect(normalized.status).toBe('Checking');
    });

    it('should handle zero-size torrent', () => {
      const torrent = [
        'hash000',
        'Zero Size',
        0,
        0,
        0,
        0,
        1,
        1,
        0,
        '/downloads',
        ''
      ];

      const normalized = client.normalizeDownload(torrent);

      expect(normalized.progress).toBe(0);
      expect(normalized.size).toBe(0);
      expect(normalized.downloaded).toBe(0);
    });
  });

  describe('Status Mapping', () => {
    const testCases = [
      { state: 0, isActive: 0, isHashChecking: 0, completed: 0, size: 100, expected: 'Stopped' },
      { state: 1, isActive: 1, isHashChecking: 0, completed: 50, size: 100, expected: 'Downloading' },
      { state: 1, isActive: 1, isHashChecking: 0, completed: 100, size: 100, expected: 'Seeding' },
      { state: 1, isActive: 0, isHashChecking: 0, completed: 50, size: 100, expected: 'Paused' },
      { state: 1, isActive: 0, isHashChecking: 0, completed: 100, size: 100, expected: 'Paused' },
      { state: 1, isActive: 0, isHashChecking: 1, completed: 50, size: 100, expected: 'Checking' },
      { state: 1, isActive: 1, isHashChecking: 1, completed: 50, size: 100, expected: 'Checking' }
    ];

    testCases.forEach(({ state, isActive, isHashChecking, completed, size, expected }) => {
      it(`should map state=${state} isActive=${isActive} isHashChecking=${isHashChecking} to ${expected}`, () => {
        const status = client._mapStatus(state, isActive, isHashChecking, completed, size);
        expect(status).toBe(expected);
      });
    });
  });

  describe('ARR Info Extraction', () => {
    it('should extract series info from filename', () => {
      const torrent = [
        'hash123',
        'Show Name - S01E02 - Episode Title',
        1000000000,
        500000000,
        1048576,
        0,
        1,
        1,
        0,
        '/downloads',
        ''
      ];

      const normalized = client.normalizeDownload(torrent);
      expect(normalized.arrType).toBe('series');
    });

    it('should extract movie info from filename', () => {
      const torrent = [
        'hash456',
        'Movie Title (2023) 1080p',
        2000000000,
        1000000000,
        1048576,
        0,
        1,
        1,
        0,
        '/downloads',
        ''
      ];

      const normalized = client.normalizeDownload(torrent);
      expect(normalized.arrType).toBe('movie');
    });

    it('should not extract ARR info from generic filename', () => {
      const torrent = [
        'hash789',
        'Generic File Name.mkv',
        1000000000,
        500000000,
        1048576,
        0,
        1,
        1,
        0,
        '/downloads',
        ''
      ];

      const normalized = client.normalizeDownload(torrent);
      expect(normalized.arrType).toBeUndefined();
    });
  });

  describe('Client Status', () => {
    it('should get client status', async () => {
      mockMethodCall.mockImplementation((method, params, callback) => {
        if (method === 'throttle.global_down.rate') {
          callback(null, 1048576);
        } else if (method === 'throttle.global_up.rate') {
          callback(null, 512000);
        }
      });

      const status = await client.getClientStatus();

      expect(status).toEqual({
        globalDownRate: 1048576,
        globalUpRate: 512000
      });
    });

    it('should handle status request errors', async () => {
      mockMethodCall.mockImplementation((method, params, callback) => {
        callback(new Error('Status error'));
      });

      const status = await client.getClientStatus();

      expect(status).toBeNull();
    });
  });
});