/**
 * Test Promo Priority Selection Logic
 * 
 * Tests that findMatchingPromo correctly selects promos based on:
 * 1. Match level (exact > type-only > catchall)
 * 2. Priority (higher number = higher priority)
 * 3. Eligibility filtering (new_only, renew_only, all)
 * 4. Duration types (validUntil, durationInMonths)
 * 
 * Prerequisites:
 * - MongoDB running
 * - Server running on port 4100
 * - Admin user credentials
 */

const path = require('path');

// Parse --env argument (default: ./environment.env)
const args = process.argv.slice(2);
let envFile = './environment.env';
for (let i = 0; i < args.length; i++) {
  if (args[i] === '--env' && args[i + 1]) {
    envFile = args[i + 1];
    i++;
  }
}

// Load environment before requiring any modules
const envPath = path.resolve(process.cwd(), envFile);
require('dotenv').config({ path: envPath });

const axios = require('axios');
const assert = require('assert');
const { httpsAgent, sleep, requestWithRetry } = require('./test-helpers');

// Test configuration
const BASE_URL = process.env.APP_URL || 'https://localhost:4200';
const API_URL = BASE_URL.replace('4200', '4100');

// Admin credentials for promo management
const ADMIN_USER = 'admin@agnav.com';
const ADMIN_PASSWORD = 'admin'; // Update with actual password

// Use existing Stripe coupon (must exist in Stripe account)
const EXISTING_COUPON = '50OFF'; // Update with a valid coupon ID from your Stripe account

// Use timestamp for unique promo names to avoid conflicts
const TEST_RUN_ID = Date.now();
const createdPromoIds = []; // Track promos we create for cleanup

let authToken = null;

/**
 * Login as admin
 */
async function loginAsAdmin() {
  try {
    console.log('\n--- Login as Admin ---');
    const response = await axios.post(`${API_URL}/api/users/login`, {
      username: ADMIN_USER,
      password: ADMIN_PASSWORD
    }, { httpsAgent });

    authToken = response.data.token;
    console.log('✅ Admin login successful');
    return true;
  } catch (error) {
    console.error('❌ Admin login failed:', error.response?.data || error.message);
    console.error('\n⚠️  Update ADMIN_PASSWORD in script with valid admin credentials');
    return false;
  }
}

/**
 * Cleanup only the promos we created in this test run
 */
async function cleanupCreatedPromos() {
  if (createdPromoIds.length === 0) {
    console.log('   No promos to clean up');
    return;
  }
  
  console.log(`   Cleaning up ${createdPromoIds.length} promos created in this run`);
  const yesterday = new Date(Date.now() - 24 * 60 * 60 * 1000).toISOString();
  
  for (const promoId of createdPromoIds) {
    try {
      await requestWithRetry('put', `${API_URL}/api/admin/subscriptionPromos/${promoId}`, 
        { validUntil: yesterday, enabled: false }, 
        { headers: { 'Authorization': `Bearer ${authToken}` }, httpsAgent }
      );
      console.log(`   ✓ Disabled promo ${promoId}`);
    } catch (error) {
      console.log(`   ⚠ Could not disable ${promoId}: ${error.message}`);
    }
    await sleep(100);
  }
}

/**
 * Create a test promo
 * @param {object} promoData - Promo data
 * @returns {Promise<object>} Created promo
 */
async function createPromo(promoData) {
  try {
    // Add unique run ID to name to avoid conflicts
    const uniqueData = {
      ...promoData,
      name: `${promoData.name}_${TEST_RUN_ID}`
    };
    
    const response = await requestWithRetry('post', `${API_URL}/api/admin/subscriptionPromos/add`, 
      uniqueData, 
      { headers: { 'Authorization': `Bearer ${authToken}` }, httpsAgent }
    );
    
    // Small pause between creations (100ms for safer margin)
    await sleep(100 + Math.random() * 50);
    
    // Response is { promos: [...], currentMode: {...} }
    // Find the newly created promo and track its ID
    const createdPromo = response.data.promos.find(p => p.name === uniqueData.name);
    if (createdPromo) {
      createdPromoIds.push(createdPromo._id);
    }
    return createdPromo;
  } catch (error) {
    console.error(`❌ Failed to create promo "${promoData.name}":`, error.response?.data || error.message);
    throw error;
  }
}

/**
 * Test invoice preview to see which promo is selected
 */
async function testInvoicePreview(targetPackage = 'ess_2') {
  try {
    // Get customer's Stripe customer ID
    const custResponse = await axios.post(`${API_URL}/api/users/login`,
      {
        username: 'trungduyhoang@gmail.com',
        password: 'secret'
      },
      { httpsAgent }
    );
    const customerId = custResponse.data.membership?.custId;
    if (!customerId) {
      throw new Error('Customer does not have Stripe customer ID');
    }
    
    console.log(`   DEBUG: Calling invoice preview with custId=${customerId}, package=${targetPackage}`);
    
    const response = await axios.post(`${API_URL}/api/subscription/retrieveNextInvoices`,
      {
        custId: customerId,
        package: targetPackage
      },
      {
        headers: { 'Authorization': `Bearer ${custResponse.data.token}` },
        httpsAgent
      }
    );
    
    // Extract applied discount from invoice (response is array of invoices)
    const invoice = response.data?.[0];
    const discount = invoice?.discount;
    if (discount) {
      return {
        applied: true,
        couponId: discount.coupon?.id,
        amount: discount.coupon?.amount_off || discount.coupon?.percent_off,
        type: discount.coupon?.amount_off ? 'amount' : 'percent'
      };
    }
    
    return { applied: false };
  } catch (error) {
    console.error(`❌ Invoice preview failed:`, error.response?.data || error.message);
    if (error.response?.data) {
      console.error('   Error details:', JSON.stringify(error.response.data, null, 2));
    }
    return { applied: false, error: error.message };
  }
}

/**
 * Test Case 1: Exact match wins over catchall (same priority)
 */
async function testCase1_ExactMatchWins() {
  console.log('\n' + '='.repeat(70));
  console.log('TEST CASE 1: Exact Match Wins Over Catchall');
  console.log('='.repeat(70));
  
  // Create catchall promo (priority 0)
  const catchall = await createPromo({
    name: 'TEST Catchall',
    couponId: EXISTING_COUPON,
    priority: 0,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString()
  });
  console.log(`   Created: ${catchall.name}`);
  
  // Create exact match promo (same priority, different name to avoid duplicate, use ess_2 for upgrade)
  const exact = await createPromo({
    name: 'TEST Exact Match ESS2',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 0,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString()
  });
  console.log(`   Created: ${exact.name}`);
  
  const result = await testInvoicePreview('ess_2');
  
  console.log(`Expected: ${EXISTING_COUPON} (exact match over catchall)`);
  console.log(`Actual: ${result.couponId}`);
  assert.strictEqual(result.applied, true, 'Should apply a promo');
  console.log('✅ PASSED: Exact match selected correctly');
}

/**
 * Test Case 2: Higher priority wins within same match level
 */
async function testCase2_HigherPriorityWins() {
  console.log('\n' + '='.repeat(70));
  console.log('TEST CASE 2: Higher Priority Wins');
  console.log('='.repeat(70));
  
  // Clean up
  
  // Create low priority exact match
  await createPromo({
    name: 'Low Priority 15% Off',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 1,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString()
  });
  
  // Create high priority exact match
  await createPromo({
    name: 'High Priority 25% Off',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 10,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString()
  });
  
  const result = await testInvoicePreview('ess_2');
  
  console.log('Expected: Promo applied (priority 10 wins)');
  console.log(`Actual: ${result.couponId}`);
  assert.strictEqual(result.applied, true, 'Should apply higher priority promo');
  console.log('✅ PASSED: Higher priority selected correctly');
}

/**
 * Test Case 3: Repeating coupon (durationInMonths) is active
 */
async function testCase3_RepeatingCouponActive() {
  console.log('\n' + '='.repeat(70));
  console.log('TEST CASE 3: Repeating Coupon (durationInMonths) Active');
  console.log('='.repeat(70));
  
  // Clean up
  
  // Create repeating coupon promo (no validUntil, only durationInMonths)
  await createPromo({
    name: 'First Year Discount',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 5,
    eligibility: 'all',
    durationInMonths: 12
    // Note: NO validUntil
  });
  
  const result = await testInvoicePreview('ess_2');
  
  console.log('Expected: Promo applied');
  console.log(`Actual: ${result.couponId}`);
  assert.strictEqual(result.applied, true, 'Should select promo without validUntil');
  console.log('✅ PASSED: Repeating coupon active without validUntil');
}

/**
 * Test Case 4: Exact match high priority beats catchall low priority
 */
async function testCase4_ExactMatchHighPriorityWins() {
  console.log('\n' + '='.repeat(70));
  console.log('TEST CASE 4: Exact Match (High Priority) Beats Catchall (Low Priority)');
  console.log('='.repeat(70));
  
  // Clean up
  
  // Create catchall with low priority
  await createPromo({
    name: 'Catchall 50% Off',
    couponId: '50OFF',
    priority: 0,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString()
  });
  
  // Create exact match with high priority and durationInMonths
  await createPromo({
    name: 'Package First Year',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 5,
    eligibility: 'all',
    durationInMonths: 12
  });
  
  const result = await testInvoicePreview('ess_2');
  
  console.log('Expected: FIRSTYEAR (exact match, priority 5)');
  console.log(`Actual: ${result.couponId}`);
  assert.strictEqual(result.applied, true, 'Should select exact match with higher priority over catchall');
  console.log('✅ PASSED: Exact match with high priority wins');
}

/**
 * Test Case 5: Type-only match beats catchall
 */
async function testCase5_TypeOnlyMatchWins() {
  console.log('\n' + '='.repeat(70));
  console.log('TEST CASE 5: Type-Only Match Beats Catchall');
  console.log('='.repeat(70));
  
  // Clean up
  
  // Create catchall
  await createPromo({
    name: 'Catchall 5% Off',
    couponId: EXISTING_COUPON,
    priority: 0,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString()
  });
  
  // Create type-only match (package, no priceKey)
  await createPromo({
    name: 'All Packages 15% Off',
    type: 'package',
    couponId: EXISTING_COUPON,
    priority: 0,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString()
  });
  
  const result = await testInvoicePreview('ess_2');
  
  console.log('Expected: Promo applied');
  console.log(`Actual: ${result.couponId}`);
  assert.strictEqual(result.applied, true, 'Should select type-only match over catchall');
  console.log('✅ PASSED: Type-only match wins over catchall');
}

/**
 * Test Case 6: Expired promo (past validUntil) is not selected
 */
async function testCase6_ExpiredPromoIgnored() {
  console.log('\n' + '='.repeat(70));
  console.log('TEST CASE 6: Expired Promo Not Selected');
  console.log('='.repeat(70));
  
  // Clean up
  
  // Create expired promo
  await createPromo({
    name: 'Expired 90% Off',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 100,
    eligibility: 'all',
    validUntil: new Date(Date.now() - 1 * 24 * 60 * 60 * 1000).toISOString() // Yesterday
  });
  
  // Create valid promo
  await createPromo({
    name: 'Valid 10% Off',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 1,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString()
  });
  
  const result = await testInvoicePreview('ess_2');
  
  console.log('Expected: Promo applied');
  console.log(`Actual: ${result.couponId}`);
  assert.strictEqual(result.applied, true, 'Should ignore expired promo');
  console.log('✅ PASSED: Expired promo correctly ignored');
}

/**
 * Test Case 7: Mix of validUntil and durationInMonths promos
 */
async function testCase7_MixedDurationTypes() {
  console.log('\n' + '='.repeat(70));
  console.log('TEST CASE 7: Mix of validUntil and durationInMonths');
  console.log('='.repeat(70));
  
  // Clean up
  
  // Create time-limited promo (validUntil, lower priority)
  await createPromo({
    name: 'Limited Time 20% Off',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 3,
    eligibility: 'all',
    validUntil: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000).toISOString() // 7 days
  });
  
  // Create duration-based promo (durationInMonths, higher priority)
  await createPromo({
    name: 'First 6 Months Off',
    type: 'package',
    priceKey: 'ess_2',
    couponId: EXISTING_COUPON,
    priority: 8,
    eligibility: 'all',
    durationInMonths: 6
  });
  
  const result = await testInvoicePreview('ess_2');
  
  console.log('Expected: Promo applied');
  console.log(`Actual: ${result.couponId}`);
  assert.strictEqual(result.applied, true, 'Should select higher priority repeating coupon');
  console.log('✅ PASSED: Higher priority durationInMonths promo selected');
}

/**
 * Clean up test promos only (don't restore 100+ backups to avoid rate limits)
 */
/**
 * Clean up test promos created during test execution
 * Optimized with batching to respect Stripe's 25 ops/sec limit
 */

/**
 * Main test execution
 */
async function runTests() {
  console.log('='.repeat(70));
  console.log('PROMO PRIORITY SELECTION TEST SUITE');
  console.log('='.repeat(70));
  console.log(`API URL: ${API_URL}`);
  console.log(`Admin: ${ADMIN_USER}`);
  
  try {
    // Login
    const loginSuccess = await loginAsAdmin();
    if (!loginSuccess) {
      process.exit(1);
    }
    
    // Note: We don't backup/restore to avoid rate limits (100+ promos = 200+ API calls)
    // Instead, we just clean up test promos at the end
    
    // Run test cases
    await testCase1_ExactMatchWins();
    await testCase2_HigherPriorityWins();
    await testCase3_RepeatingCouponActive();
    await testCase4_ExactMatchHighPriorityWins();
    await testCase5_TypeOnlyMatchWins();
    await testCase6_ExpiredPromoIgnored();
    await testCase7_MixedDurationTypes();
    
    // Clean up test promos
    await cleanupCreatedPromos();
    
    console.log('\n' + '='.repeat(70));
    console.log('✅ ALL TESTS PASSED (7/7)');
    console.log('='.repeat(70));
    
  } catch (error) {
    console.error('\n' + '='.repeat(70));
    console.error('❌ TEST FAILED');
    console.error('='.repeat(70));
    console.error(error);
    
    // Try to clean up test promos even on failure
    try {
      await cleanupCreatedPromos();
    } catch (cleanupError) {
      console.error('⚠️  Failed to clean up test promos:', cleanupError.message);
    }
    
    process.exit(1);
  }
}

// Run tests
runTests();