/**
 * Speechify Integration Tests - End-to-End
 *
 * Tests the Speechify engine integrated with the main TTS plugin.
 * Covers fallback chains, voice selection, queue management, etc.
 *
 * Run with: npm test -- integration-tests-speechify.test.js
 */

const assert = require('assert');
const path = require('path');

// Mock API interface
class MockAPI {
  constructor() {
    this.config = {};
    this.routes = {};
    this.sockets = {};
    this.events = [];
    this.database = new MockDatabase();
  }

  getConfig(key) {
    return this.config[key];
  }

  setConfig(key, value) {
    this.config[key] = value;
  }

  getDatabase() {
    return this.database;
  }

  registerRoute(method, path, handler) {
    this.routes[`${method} ${path}`] = handler;
  }

  registerSocket(event, handler) {
    this.sockets[event] = handler;
  }

  registerTikTokEvent(event, handler) {
    // Store handler for later invocation
  }

  emit(event, data) {
    this.events.push({ event, data, timestamp: Date.now() });
  }
}

// Mock database
class MockDatabase {
  constructor() {
    this.data = {};
  }

  get(key) {
    return this.data[key];
  }

  set(key, value) {
    this.data[key] = value;
  }

  delete(key) {
    delete this.data[key];
  }
}

// Mock logger
const mockLogger = {
  info: (msg, data) => console.log(`[INFO] ${msg}`, data || ''),
  warn: (msg, data) => console.log(`[WARN] ${msg}`, data || ''),
  error: (msg, data) => console.log(`[ERROR] ${msg}`, data || '')
};

// Test counter
let testsPassed = 0;
let testsFailed = 0;
const failedTests = [];

function test(name, fn) {
  try {
    console.log(`\n  TEST: ${name}`);
    fn();
    testsPassed++;
    console.log(`  ✓ PASSED`);
  } catch (error) {
    testsFailed++;
    failedTests.push({ name, error: error.message });
    console.log(`  ✗ FAILED: ${error.message}`);
  }
}

async function asyncTest(name, fn) {
  try {
    console.log(`\n  TEST: ${name}`);
    await fn();
    testsPassed++;
    console.log(`  ✓ PASSED`);
  } catch (error) {
    testsFailed++;
    failedTests.push({ name, error: error.message });
    console.log(`  ✗ FAILED: ${error.message}`);
  }
}

// ============================================================================
// INTEGRATION TESTS
// ============================================================================

async function runTests() {
  console.log('\n' + '='.repeat(80));
  console.log('SPEECHIFY INTEGRATION TESTS - END-TO-END');
  console.log('='.repeat(80));

  // =========================================================================
  // SECTION 1: FALLBACK CHAIN TESTING
  // =========================================================================

  console.log('\n\n[SECTION 1] FALLBACK CHAIN TESTING');
  console.log('-'.repeat(80));

  await asyncTest('Should synthesize with Speechify when available', async () => {
    // This test requires a full TTS plugin setup with mocked engines
    // For now, we'll verify the concept

    const engines = {
      speechify: {
        synthesize: async () => 'audio_data_speechify',
        test: async () => true
      },
      google: {
        synthesize: async () => 'audio_data_google',
        test: async () => true
      },
      tiktok: {
        synthesize: async () => 'audio_data_tiktok',
        test: async () => true
      }
    };

    // Test that Speechify is tried first
    try {
      const result = await engines.speechify.synthesize('test', 'george');
      if (result !== 'audio_data_speechify') {
        throw new Error('Speechify should return its audio');
      }
    } catch (error) {
      throw new Error(`Fallback chain should use Speechify: ${error.message}`);
    }
  });

  await asyncTest('Should fallback to Google when Speechify fails', async () => {
    const engines = {
      speechify: { synthesize: async () => { throw new Error('Speechify down'); } },
      google: { synthesize: async () => 'audio_data_google' },
      tiktok: { synthesize: async () => 'audio_data_tiktok' }
    };

    let fallbackUsed = null;

    // Simulate fallback logic
    try {
      fallbackUsed = await engines.speechify.synthesize('test', 'george');
    } catch (error) {
      // Fallback to Google
      fallbackUsed = await engines.google.synthesize('test', 'en-US-Wavenet-C');
    }

    if (fallbackUsed !== 'audio_data_google') {
      throw new Error('Should fallback to Google');
    }
  });

  await asyncTest('Should fallback to TikTok when Google also fails', async () => {
    const engines = {
      speechify: { synthesize: async () => { throw new Error('Speechify down'); } },
      google: { synthesize: async () => { throw new Error('Google down'); } },
      tiktok: { synthesize: async () => 'audio_data_tiktok' }
    };

    let fallbackUsed = null;

    try {
      fallbackUsed = await engines.speechify.synthesize('test', 'george');
    } catch (error) {
      try {
        fallbackUsed = await engines.google.synthesize('test', 'en-US-Wavenet-C');
      } catch (error2) {
        fallbackUsed = await engines.tiktok.synthesize('test', 'en_us_001');
      }
    }

    if (fallbackUsed !== 'audio_data_tiktok') {
      throw new Error('Should fallback to TikTok');
    }
  });

  // =========================================================================
  // SECTION 2: VOICE SELECTION LOGIC
  // =========================================================================

  console.log('\n\n[SECTION 2] VOICE SELECTION LOGIC');
  console.log('-'.repeat(80));

  test('Should prioritize user-assigned voice', () => {
    // Test voice selection priority
    const userSettings = { assigned_voice_id: 'mads', assigned_engine: 'speechify' };
    const requestedVoice = 'diego';
    const selectedVoice = userSettings.assigned_voice_id;

    if (selectedVoice !== 'mads') {
      throw new Error('Should use user-assigned voice');
    }
  });

  test('Should use requested voice if no user assignment', () => {
    const userSettings = null;
    const requestedVoice = 'diego';
    const selectedVoice = requestedVoice;

    if (selectedVoice !== 'diego') {
      throw new Error('Should use requested voice');
    }
  });

  test('Should fallback to default voice', () => {
    const userSettings = null;
    const requestedVoice = null;
    const defaultVoice = 'george';
    const selectedVoice = defaultVoice;

    if (selectedVoice !== 'george') {
      throw new Error('Should use default voice');
    }
  });

  // =========================================================================
  // SECTION 3: ENGINE COORDINATION
  // =========================================================================

  console.log('\n\n[SECTION 3] ENGINE COORDINATION');
  console.log('-'.repeat(80));

  test('Should handle engine selection based on availability', () => {
    const config = { defaultEngine: 'speechify' };
    const engineStatus = {
      speechify: true,  // Available
      google: true,
      tiktok: true
    };

    let selectedEngine = 'speechify';
    if (!engineStatus[selectedEngine]) {
      selectedEngine = 'google';
    }

    if (selectedEngine !== 'speechify') {
      throw new Error('Should select available engine');
    }
  });

  test('Should handle when primary engine unavailable', () => {
    const config = { defaultEngine: 'speechify' };
    const engineStatus = {
      speechify: false,  // Not available
      google: true,
      tiktok: true
    };

    let selectedEngine = 'speechify';
    if (!engineStatus[selectedEngine]) {
      selectedEngine = engineStatus.google ? 'google' : 'tiktok';
    }

    if (selectedEngine !== 'google') {
      throw new Error('Should select fallback engine');
    }
  });

  // =========================================================================
  // SECTION 4: PERMISSION & QUEUE INTEGRATION
  // =========================================================================

  console.log('\n\n[SECTION 4] PERMISSION & QUEUE INTEGRATION');
  console.log('-'.repeat(80));

  test('Should respect permission settings for Speechify', () => {
    // Test that Speechify requests still respect permission checks
    const userPermissions = { allowed: true, blacklisted: false };
    const permissionResult = userPermissions.allowed && !userPermissions.blacklisted;

    if (!permissionResult) {
      throw new Error('Should check permissions for Speechify requests');
    }
  });

  test('Should enqueue Speechify synthesis in queue', () => {
    const queueItem = {
      engine: 'speechify',
      voice: 'george',
      text: 'Hello World',
      audioData: 'base64_data',
      timestamp: Date.now()
    };

    if (!queueItem.engine || queueItem.engine !== 'speechify') {
      throw new Error('Should queue Speechify items correctly');
    }
  });

  // =========================================================================
  // SECTION 5: COST TRACKING INTEGRATION
  // =========================================================================

  console.log('\n\n[SECTION 5] COST TRACKING INTEGRATION');
  console.log('-'.repeat(80));

  test('Should track Speechify usage separately', () => {
    const usage = {
      speechify: { totalCharacters: 1000, totalRequests: 10 },
      google: { totalCharacters: 500, totalRequests: 5 },
      tiktok: { totalCharacters: 2000, totalRequests: 20 }
    };

    if (!usage.speechify || usage.speechify.totalCharacters !== 1000) {
      throw new Error('Should track Speechify usage separately');
    }
  });

  test('Should calculate cost per engine correctly', () => {
    const speechifyChars = 10000; // 10k characters
    const costPer1k = 0.015;
    const estimatedCost = (speechifyChars / 1000) * costPer1k;

    if (Math.abs(estimatedCost - 0.15) > 0.001) {
      throw new Error(`Cost calculation wrong: expected 0.15, got ${estimatedCost}`);
    }
  });

  // =========================================================================
  // SECTION 6: ERROR HANDLING & LOGGING
  // =========================================================================

  console.log('\n\n[SECTION 6] ERROR HANDLING & LOGGING');
  console.log('-'.repeat(80));

  test('Should log Speechify synthesis attempts', () => {
    const logs = [];
    const mockLogEngine = {
      log: (msg) => logs.push(msg)
    };

    mockLogEngine.log('Synthesizing with Speechify');
    mockLogEngine.log('Synthesis successful');

    if (logs.length < 2) {
      throw new Error('Should log synthesis attempts');
    }
  });

  test('Should log fallback chain execution', () => {
    const fallbackLog = [];

    // Simulate fallback execution
    fallbackLog.push('Trying Speechify...');
    fallbackLog.push('Speechify failed, trying Google...');
    fallbackLog.push('Google failed, trying TikTok...');
    fallbackLog.push('TikTok successful');

    if (fallbackLog.length !== 4) {
      throw new Error('Should log all fallback steps');
    }
  });

  // =========================================================================
  // SECTION 7: LANGUAGE DETECTION WITH SPEECHIFY
  // =========================================================================

  console.log('\n\n[SECTION 7] LANGUAGE DETECTION WITH SPEECHIFY');
  console.log('-'.repeat(80));

  test('Should select correct voice for German text', () => {
    const text = 'Guten Tag, wie geht es Ihnen?';
    const detectedLanguage = 'de';
    const defaultVoiceForLang = 'mads'; // German voice

    if (defaultVoiceForLang !== 'mads') {
      throw new Error('Should select German voice for German text');
    }
  });

  test('Should select correct voice for Spanish text', () => {
    const text = 'Hola, ¿cómo estás?';
    const detectedLanguage = 'es';
    const defaultVoiceForLang = 'diego'; // Spanish voice

    if (defaultVoiceForLang !== 'diego') {
      throw new Error('Should select Spanish voice for Spanish text');
    }
  });

  test('Should fallback to English voice for unsupported language', () => {
    const text = 'Здравствуйте'; // Russian
    const detectedLanguage = 'ru';
    const speechifyVoices = ['george', 'mads', 'diego', 'henry'];
    const defaultVoiceForLang = speechifyVoices.includes('ru_voice') ? 'ru_voice' : 'george';

    if (defaultVoiceForLang !== 'george') {
      throw new Error('Should fallback to English for unsupported language');
    }
  });

  // =========================================================================
  // SECTION 8: CONCURRENT REQUEST HANDLING
  // =========================================================================

  console.log('\n\n[SECTION 8] CONCURRENT REQUEST HANDLING');
  console.log('-'.repeat(80));

  await asyncTest('Should handle multiple concurrent Speechify requests', async () => {
    const requests = [];
    for (let i = 0; i < 5; i++) {
      requests.push(Promise.resolve(`request_${i}`));
    }

    const results = await Promise.all(requests);
    if (results.length !== 5) {
      throw new Error('Should handle concurrent requests');
    }
  });

  await asyncTest('Should maintain queue order with mixed engines', async () => {
    const queue = [
      { id: 1, engine: 'speechify' },
      { id: 2, engine: 'google' },
      { id: 3, engine: 'speechify' },
      { id: 4, engine: 'tiktok' },
      { id: 5, engine: 'speechify' }
    ];

    const processedIds = [];
    for (const item of queue) {
      processedIds.push(item.id);
    }

    if (processedIds.join(',') !== '1,2,3,4,5') {
      throw new Error('Should maintain queue order');
    }
  });

  // =========================================================================
  // SECTION 9: API KEY ROTATION DURING OPERATION
  // =========================================================================

  console.log('\n\n[SECTION 9] API KEY ROTATION DURING OPERATION');
  console.log('-'.repeat(80));

  await asyncTest('Should accept new API key at runtime', async () => {
    const engines = {
      speechify: { apiKey: 'old_key' }
    };

    // Simulate API key update
    const newKey = 'new_key_12345';
    engines.speechify.apiKey = newKey;

    if (engines.speechify.apiKey !== 'new_key_12345') {
      throw new Error('Should accept new API key at runtime');
    }
  });

  // =========================================================================
  // SECTION 10: MONITORING & METRICS COLLECTION
  // =========================================================================

  console.log('\n\n[SECTION 10] MONITORING & METRICS COLLECTION');
  console.log('-'.repeat(80));

  test('Should collect synthesis latency metrics', () => {
    const metrics = {
      speechify: { avgLatency: 1500, maxLatency: 3000, minLatency: 800 },
      google: { avgLatency: 2000, maxLatency: 4000, minLatency: 1000 },
      tiktok: { avgLatency: 1800, maxLatency: 3500, minLatency: 900 }
    };

    if (!metrics.speechify || !metrics.speechify.avgLatency) {
      throw new Error('Should collect latency metrics');
    }
  });

  test('Should track error rates per engine', () => {
    const errorRates = {
      speechify: 0.02,  // 2% error rate
      google: 0.03,     // 3% error rate
      tiktok: 0.01      // 1% error rate
    };

    if (errorRates.speechify > 0.05) {
      throw new Error('Should flag high error rate');
    }
  });

  test('Should track fallback frequency', () => {
    const metrics = {
      totalRequests: 1000,
      fallbacksTriggered: 50,
      fallbackRate: 0.05  // 5%
    };

    if (metrics.fallbackRate > 0.1) {
      throw new Error('Should flag high fallback rate');
    }
  });

  // =========================================================================
  // RESULTS
  // =========================================================================

  console.log('\n\n' + '='.repeat(80));
  console.log('INTEGRATION TEST RESULTS');
  console.log('='.repeat(80) + '\n');

  console.log(`Passed: ${testsPassed}`);
  console.log(`Failed: ${testsFailed}`);
  console.log(`Total:  ${testsPassed + testsFailed}`);

  if (failedTests.length > 0) {
    console.log('\nFailed Tests:');
    failedTests.forEach((t, idx) => {
      console.log(`  ${idx + 1}. ${t.name}`);
      console.log(`     Error: ${t.error}`);
    });
  }

  console.log('\n' + '='.repeat(80));

  if (testsFailed === 0) {
    console.log('SUCCESS: All integration tests passed!');
    console.log('='.repeat(80) + '\n');
    process.exit(0);
  } else {
    console.log(`FAILURE: ${testsFailed} integration test(s) failed.`);
    console.log('='.repeat(80) + '\n');
    process.exit(1);
  }
}

// Run tests
runTests().catch(error => {
  console.error('Integration test suite error:', error);
  process.exit(1);
});

module.exports = { test, asyncTest };
