const axios = require('axios');

const API_URL = 'http://localhost:3000/api';

// Category UUIDs (from database)
const CATEGORY_IDS = {
  JAVASCRIPT: '68b4c87f-db0b-48ea-b8a4-b2f4fce785a2',
  ANGULAR: '0033017b-6ecb-4e9d-8f13-06fc222c1dfc',
  REACT: 'd27e3412-6f2b-432d-8d63-1e165ea5fffd',
  NODEJS: '5e3094ab-ab6d-4f8a-9261-8177b9c979ae',
  TYPESCRIPT: '7a71ab02-a7e4-4a76-a364-de9d6e3f3411',
  SQL_DATABASES: '24b7b12d-fa23-448f-9f55-b0b9b82a844f',
  SYSTEM_DESIGN: '65b3ad28-a19d-413a-9abe-94184f963d77',
};

// Test user credentials (from seeder)
const testUser = {
  email: 'admin@quiz.com',
  password: 'Admin@123'
};

// ANSI color codes for output
const colors = {
  reset: '\x1b[0m',
  green: '\x1b[32m',
  red: '\x1b[31m',
  yellow: '\x1b[33m',
  blue: '\x1b[34m',
  cyan: '\x1b[36m'
};

let userToken = null;
let guestToken = null;

/**
 * Login as registered user
 */
async function loginUser() {
  try {
    const response = await axios.post(`${API_URL}/auth/login`, testUser);
    userToken = response.data.data.token;
    console.log(`${colors.cyan}✓ Logged in as user${colors.reset}`);
    return userToken;
  } catch (error) {
    console.error(`${colors.red}✗ Failed to login:${colors.reset}`, error.response?.data || error.message);
    throw error;
  }
}

/**
 * Create guest session
 */
async function createGuestSession() {
  try {
    const response = await axios.post(`${API_URL}/guest/start-session`, {
      deviceId: 'test-device-category-details'
    });
    guestToken = response.data.sessionToken;
    console.log(`${colors.cyan}✓ Created guest session${colors.reset}`);
    return guestToken;
  } catch (error) {
    console.error(`${colors.red}✗ Failed to create guest session:${colors.reset}`, error.response?.data || error.message);
    throw error;
  }
}

/**
 * Test 1: Get guest-accessible category details (JavaScript)
 */
async function testGetGuestCategoryDetails() {
  console.log(`\n${colors.blue}Test 1: Get guest-accessible category details (JavaScript)${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/${CATEGORY_IDS.JAVASCRIPT}`, {
      headers: {
        'X-Guest-Token': guestToken
      }
    });
    
    const { success, data, message } = response.data;
    
    // Validations
    if (!success) throw new Error('success should be true');
    if (!data.category) throw new Error('Missing category data');
    if (!data.questionPreview) throw new Error('Missing questionPreview');
    if (!data.stats) throw new Error('Missing stats');
    
    if (data.category.name !== 'JavaScript') throw new Error('Expected JavaScript category');
    if (!data.category.guestAccessible) throw new Error('Should be guest-accessible');
    
    console.log(`${colors.green}✓ Test 1 Passed${colors.reset}`);
    console.log(`  Category: ${data.category.name}`);
    console.log(`  Questions Preview: ${data.questionPreview.length}`);
    console.log(`  Total Questions: ${data.stats.totalQuestions}`);
    console.log(`  Average Accuracy: ${data.stats.averageAccuracy}%`);
    
    return true;
  } catch (error) {
    console.error(`${colors.red}✗ Test 1 Failed:${colors.reset}`, error.response?.data || error.message);
    return false;
  }
}

/**
 * Test 2: Guest tries to access auth-only category (Node.js)
 */
async function testGuestAccessAuthCategory() {
  console.log(`\n${colors.blue}Test 2: Guest tries to access auth-only category (Node.js)${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/${CATEGORY_IDS.NODEJS}`, {
      headers: {
        'X-Guest-Token': guestToken
      }
    });
    
    // Should not reach here
    console.error(`${colors.red}✗ Test 2 Failed: Should have been rejected${colors.reset}`);
    return false;
  } catch (error) {
    if (error.response && error.response.status === 403) {
      const { success, message, requiresAuth } = error.response.data;
      
      if (success !== false) throw new Error('success should be false');
      if (!requiresAuth) throw new Error('requiresAuth should be true');
      if (!message.includes('authentication')) throw new Error('Message should mention authentication');
      
      console.log(`${colors.green}✓ Test 2 Passed${colors.reset}`);
      console.log(`  Status: 403 Forbidden`);
      console.log(`  Message: ${message}`);
      console.log(`  Requires Auth: ${requiresAuth}`);
      return true;
    } else {
      console.error(`${colors.red}✗ Test 2 Failed: Wrong error${colors.reset}`, error.response?.data || error.message);
      return false;
    }
  }
}

/**
 * Test 3: Authenticated user gets auth-only category details (Node.js)
 */
async function testAuthUserAccessCategory() {
  console.log(`\n${colors.blue}Test 3: Authenticated user gets auth-only category details (Node.js)${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/${CATEGORY_IDS.NODEJS}`, {
      headers: {
        'Authorization': `Bearer ${userToken}`
      }
    });
    
    const { success, data } = response.data;
    
    if (!success) throw new Error('success should be true');
    if (data.category.name !== 'Node.js') throw new Error('Expected Node.js category');
    if (data.category.guestAccessible) throw new Error('Should not be guest-accessible');
    
    console.log(`${colors.green}✓ Test 3 Passed${colors.reset}`);
    console.log(`  Category: ${data.category.name}`);
    console.log(`  Guest Accessible: ${data.category.guestAccessible}`);
    console.log(`  Total Questions: ${data.stats.totalQuestions}`);
    
    return true;
  } catch (error) {
    console.error(`${colors.red}✗ Test 3 Failed:${colors.reset}`, error.response?.data || error.message);
    return false;
  }
}

/**
 * Test 4: Invalid category ID (non-numeric)
 */
async function testInvalidCategoryId() {
  console.log(`\n${colors.blue}Test 4: Invalid category ID (non-numeric)${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/invalid`, {
      headers: {
        'Authorization': `Bearer ${userToken}`
      }
    });
    
    console.error(`${colors.red}✗ Test 4 Failed: Should have been rejected${colors.reset}`);
    return false;
  } catch (error) {
    if (error.response && error.response.status === 400) {
      const { success, message } = error.response.data;
      
      if (success !== false) throw new Error('success should be false');
      if (!message.includes('Invalid')) throw new Error('Message should mention invalid ID');
      
      console.log(`${colors.green}✓ Test 4 Passed${colors.reset}`);
      console.log(`  Status: 400 Bad Request`);
      console.log(`  Message: ${message}`);
      return true;
    } else {
      console.error(`${colors.red}✗ Test 4 Failed: Wrong error${colors.reset}`, error.response?.data || error.message);
      return false;
    }
  }
}

/**
 * Test 5: Non-existent category ID
 */
async function testNonExistentCategory() {
  console.log(`\n${colors.blue}Test 5: Non-existent category ID (999)${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/999`, {
      headers: {
        'Authorization': `Bearer ${userToken}`
      }
    });
    
    console.error(`${colors.red}✗ Test 5 Failed: Should have returned 404${colors.reset}`);
    return false;
  } catch (error) {
    if (error.response && error.response.status === 404) {
      const { success, message } = error.response.data;
      
      if (success !== false) throw new Error('success should be false');
      if (!message.includes('not found')) throw new Error('Message should mention not found');
      
      console.log(`${colors.green}✓ Test 5 Passed${colors.reset}`);
      console.log(`  Status: 404 Not Found`);
      console.log(`  Message: ${message}`);
      return true;
    } else {
      console.error(`${colors.red}✗ Test 5 Failed: Wrong error${colors.reset}`, error.response?.data || error.message);
      return false;
    }
  }
}

/**
 * Test 6: Verify response structure
 */
async function testResponseStructure() {
  console.log(`\n${colors.blue}Test 6: Verify response structure${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/${CATEGORY_IDS.JAVASCRIPT}`, {
      headers: {
        'Authorization': `Bearer ${userToken}`
      }
    });
    
    const { success, data, message } = response.data;
    const { category, questionPreview, stats } = data;
    
    // Check category fields
    const requiredCategoryFields = ['id', 'name', 'slug', 'description', 'icon', 'color', 'questionCount', 'displayOrder', 'guestAccessible'];
    for (const field of requiredCategoryFields) {
      if (!(field in category)) throw new Error(`Missing category field: ${field}`);
    }
    
    // Check question preview structure
    if (!Array.isArray(questionPreview)) throw new Error('questionPreview should be an array');
    if (questionPreview.length > 5) throw new Error('questionPreview should have max 5 questions');
    
    if (questionPreview.length > 0) {
      const question = questionPreview[0];
      const requiredQuestionFields = ['id', 'questionText', 'questionType', 'difficulty', 'points', 'accuracy'];
      for (const field of requiredQuestionFields) {
        if (!(field in question)) throw new Error(`Missing question field: ${field}`);
      }
    }
    
    // Check stats structure
    const requiredStatsFields = ['totalQuestions', 'questionsByDifficulty', 'totalAttempts', 'totalCorrect', 'averageAccuracy'];
    for (const field of requiredStatsFields) {
      if (!(field in stats)) throw new Error(`Missing stats field: ${field}`);
    }
    
    // Check difficulty breakdown
    const { questionsByDifficulty } = stats;
    if (!('easy' in questionsByDifficulty)) throw new Error('Missing easy difficulty count');
    if (!('medium' in questionsByDifficulty)) throw new Error('Missing medium difficulty count');
    if (!('hard' in questionsByDifficulty)) throw new Error('Missing hard difficulty count');
    
    console.log(`${colors.green}✓ Test 6 Passed${colors.reset}`);
    console.log(`  All required fields present`);
    console.log(`  Question preview length: ${questionPreview.length}`);
    console.log(`  Difficulty breakdown: Easy=${questionsByDifficulty.easy}, Medium=${questionsByDifficulty.medium}, Hard=${questionsByDifficulty.hard}`);
    
    return true;
  } catch (error) {
    console.error(`${colors.red}✗ Test 6 Failed:${colors.reset}`, error.response?.data || error.message);
    return false;
  }
}

/**
 * Test 7: No authentication (public access to guest category)
 */
async function testPublicAccessGuestCategory() {
  console.log(`\n${colors.blue}Test 7: Public access to guest-accessible category (no auth)${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/${CATEGORY_IDS.JAVASCRIPT}`);
    
    const { success, data } = response.data;
    
    if (!success) throw new Error('success should be true');
    if (data.category.name !== 'JavaScript') throw new Error('Expected JavaScript category');
    if (!data.category.guestAccessible) throw new Error('Should be guest-accessible');
    
    console.log(`${colors.green}✓ Test 7 Passed${colors.reset}`);
    console.log(`  Public access allowed for guest-accessible categories`);
    console.log(`  Category: ${data.category.name}`);
    
    return true;
  } catch (error) {
    console.error(`${colors.red}✗ Test 7 Failed:${colors.reset}`, error.response?.data || error.message);
    return false;
  }
}

/**
 * Test 8: No authentication (public tries auth-only category)
 */
async function testPublicAccessAuthCategory() {
  console.log(`\n${colors.blue}Test 8: Public access to auth-only category (no auth)${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/${CATEGORY_IDS.NODEJS}`);
    
    console.error(`${colors.red}✗ Test 8 Failed: Should have been rejected${colors.reset}`);
    return false;
  } catch (error) {
    if (error.response && error.response.status === 403) {
      const { success, requiresAuth } = error.response.data;
      
      if (success !== false) throw new Error('success should be false');
      if (!requiresAuth) throw new Error('requiresAuth should be true');
      
      console.log(`${colors.green}✓ Test 8 Passed${colors.reset}`);
      console.log(`  Public access blocked for auth-only categories`);
      console.log(`  Status: 403 Forbidden`);
      return true;
    } else {
      console.error(`${colors.red}✗ Test 8 Failed: Wrong error${colors.reset}`, error.response?.data || error.message);
      return false;
    }
  }
}

/**
 * Test 9: Verify stats calculations
 */
async function testStatsCalculations() {
  console.log(`\n${colors.blue}Test 9: Verify stats calculations${colors.reset}`);
  
  try {
    const response = await axios.get(`${API_URL}/categories/${CATEGORY_IDS.JAVASCRIPT}`, {
      headers: {
        'Authorization': `Bearer ${userToken}`
      }
    });
    
    const { data } = response.data;
    const { stats } = data;
    
    // Verify difficulty sum equals total
    const difficultySum = stats.questionsByDifficulty.easy + 
                          stats.questionsByDifficulty.medium + 
                          stats.questionsByDifficulty.hard;
    
    if (difficultySum !== stats.totalQuestions) {
      throw new Error(`Difficulty sum (${difficultySum}) doesn't match total questions (${stats.totalQuestions})`);
    }
    
    // Verify accuracy is within valid range
    if (stats.averageAccuracy < 0 || stats.averageAccuracy > 100) {
      throw new Error(`Invalid accuracy: ${stats.averageAccuracy}%`);
    }
    
    // If there are attempts, verify accuracy calculation
    if (stats.totalAttempts > 0) {
      const expectedAccuracy = Math.round((stats.totalCorrect / stats.totalAttempts) * 100);
      if (stats.averageAccuracy !== expectedAccuracy) {
        throw new Error(`Accuracy mismatch: expected ${expectedAccuracy}%, got ${stats.averageAccuracy}%`);
      }
    }
    
    console.log(`${colors.green}✓ Test 9 Passed${colors.reset}`);
    console.log(`  Total Questions: ${stats.totalQuestions}`);
    console.log(`  Difficulty Sum: ${difficultySum}`);
    console.log(`  Total Attempts: ${stats.totalAttempts}`);
    console.log(`  Total Correct: ${stats.totalCorrect}`);
    console.log(`  Average Accuracy: ${stats.averageAccuracy}%`);
    
    return true;
  } catch (error) {
    console.error(`${colors.red}✗ Test 9 Failed:${colors.reset}`, error.response?.data || error.message);
    return false;
  }
}

/**
 * Run all tests
 */
async function runAllTests() {
  console.log(`${colors.cyan}========================================${colors.reset}`);
  console.log(`${colors.cyan}Testing Category Details API${colors.reset}`);
  console.log(`${colors.cyan}========================================${colors.reset}`);
  
  const results = [];
  
  try {
    // Setup
    await loginUser();
    await createGuestSession();
    
    // Run tests
    results.push(await testGetGuestCategoryDetails());
    results.push(await testGuestAccessAuthCategory());
    results.push(await testAuthUserAccessCategory());
    results.push(await testInvalidCategoryId());
    results.push(await testNonExistentCategory());
    results.push(await testResponseStructure());
    results.push(await testPublicAccessGuestCategory());
    results.push(await testPublicAccessAuthCategory());
    results.push(await testStatsCalculations());
    
    // Summary
    console.log(`\n${colors.cyan}========================================${colors.reset}`);
    console.log(`${colors.cyan}Test Summary${colors.reset}`);
    console.log(`${colors.cyan}========================================${colors.reset}`);
    
    const passed = results.filter(r => r === true).length;
    const failed = results.filter(r => r === false).length;
    
    console.log(`${colors.green}Passed: ${passed}${colors.reset}`);
    console.log(`${colors.red}Failed: ${failed}${colors.reset}`);
    console.log(`Total: ${results.length}`);
    
    if (failed === 0) {
      console.log(`\n${colors.green}✓ All tests passed!${colors.reset}`);
    } else {
      console.log(`\n${colors.red}✗ Some tests failed${colors.reset}`);
      process.exit(1);
    }
    
  } catch (error) {
    console.error(`${colors.red}Test execution error:${colors.reset}`, error);
    process.exit(1);
  }
}

// Run tests
runAllTests();