const { chromium } = require('playwright');
const fs = require('fs');
const path = require('path');

// ========================================
// CONFIGURATION - Customize for your site
// ========================================

const SITE_URL = 'https://example.com';
const LOGIN_REQUIRED = true;

const LOGIN_CREDENTIALS = {
  username: 'your_username',
  password: 'your_password'
};

const FORM_DATA = {
  field1: 'Value 1',
  field2: 'Value 2',
  description: 'Long description text here...'
};

// ========================================
// CORE UTILITY: Page Dumping System
// ========================================

/**
 * Dumps page information for debugging:
 * - Full HTML content
 * - Screenshot (full page)
 * - All form elements with their properties
 * 
 * Use this BEFORE filling forms and AFTER errors
 */
async function dumpPageInfo(page, prefix) {
  const timestamp = Date.now();
  const dumpDir = path.join(__dirname, 'page-dumps');
  
  // Create dumps directory if not exists
  if (!fs.existsSync(dumpDir)) {
    fs.mkdirSync(dumpDir, { recursive: true });
  }
  
  console.log('🔍 Dumping page for debugging...');
  
  try {
    // 1. Save full HTML
    const html = await page.content();
    const htmlPath = path.join(dumpDir, `${prefix}-${timestamp}.html`);
    fs.writeFileSync(htmlPath, html);
    console.log(`  📄 HTML saved: ${htmlPath}`);
    
    // 2. Take screenshot
    const screenshotPath = path.join(dumpDir, `${prefix}-${timestamp}.png`);
    await page.screenshot({ 
      path: screenshotPath,
      fullPage: true 
    });
    console.log(`  📸 Screenshot saved: ${screenshotPath}`);
    
    // 3. Extract all form elements
    const elements = await page.$$eval('input, textarea, select, button', els => 
      els.map(el => ({
        tag: el.tagName.toLowerCase(),
        type: el.type || '',
        name: el.name || '',
        id: el.id || '',
        placeholder: el.placeholder || '',
        value: el.value || '',
        class: el.className || ''
      }))
    );
    
    const selectorsPath = path.join(dumpDir, `${prefix}-${timestamp}-selectors.txt`);
    fs.writeFileSync(selectorsPath, JSON.stringify(elements, null, 2));
    console.log(`  📋 Form elements saved: ${selectorsPath}`);
    
  } catch (error) {
    console.error(`❌ Error during page dump: ${error.message}`);
  }
}

// ========================================
// LOGIN HANDLER with Fallback
// ========================================

async function handleLogin(page, credentials) {
  console.log('🔐 Attempting automatic login...');
  
  try {
    // Dump login page first to understand structure
    await dumpPageInfo(page, 'login-page-initial');
    
    // Fill login form
    await page.fill('input[name="username"]', credentials.username);
    await page.fill('input[name="password"]', credentials.password);
    
    // Submit (click button, don't use form.submit())
    await page.click('input[type="submit"], button[type="submit"]');
    
    // Wait for redirect after successful login
    // Adjust the URL pattern to match your site's post-login URL
    await page.waitForURL(/.*\/(?!login|signin)/, { timeout: 30000 });
    
    console.log('✅ Login successful!\n');
    
  } catch (loginError) {
    console.warn('⚠️  Auto-login failed, trying manual intervention...');
    await dumpPageInfo(page, 'login-error');
    
    console.log('\n⏸️  Please log in manually in the browser window.');
    console.log('   Waiting up to 5 minutes for manual login...\n');
    
    // Wait for user to login manually
    await page.waitForURL(/.*\/(?!login|signin)/, { timeout: 300000 });
    console.log('✅ Manual login detected!\n');
  }
}

// ========================================
// MAIN AUTOMATION FUNCTION
// ========================================

async function automateFormSubmission() {
  console.log('🚀 Starting form automation...\n');
  
  // Launch browser (headless: false to see what's happening)
  const browser = await chromium.launch({ 
    headless: false,
    slowMo: 100 // Slow down operations for visibility
  });
  
  const context = await browser.newContext({
    viewport: { width: 1920, height: 1080 }
  });
  
  const page = await context.newPage();
  
  try {
    // ========================================
    // STEP 1: Navigate to site
    // ========================================
    console.log('📋 Step 1: Navigating to site...');
    await page.goto(SITE_URL);
    await page.waitForLoadState('networkidle');
    
    // ========================================
    // STEP 2: Handle login if required
    // ========================================
    if (LOGIN_REQUIRED) {
      // Check if login is needed (adjust selector to your site)
      const needsLogin = await page.locator('a:has-text("Login"), a:has-text("Sign in")').count() > 0;
      
      if (needsLogin) {
        console.log('⚠️  Login required!\n');
        // Navigate to login page (adjust URL)
        await page.goto(`${SITE_URL}/login`);
        await handleLogin(page, LOGIN_CREDENTIALS);
      } else {
        console.log('✅ Already logged in!\n');
      }
    }
    
    // ========================================
    // STEP 3: Navigate to form page
    // ========================================
    console.log('📋 Step 2: Navigating to form page...');
    await page.goto(`${SITE_URL}/submit-form`); // Adjust URL
    await page.waitForLoadState('networkidle');
    
    // ========================================
    // STEP 4: Dump page to understand structure
    // ========================================
    console.log('📝 Step 3: Analyzing form structure...');
    await dumpPageInfo(page, 'form-initial');
    
    // ========================================
    // STEP 5: Fill form fields
    // ========================================
    console.log('📝 Step 4: Filling form...');
    
    try {
      // Simple text input
      await page.fill('input[name="field1"]', FORM_DATA.field1);
      console.log('  ✓ Field1 filled');
      
      // Another text input
      await page.fill('input[name="field2"]', FORM_DATA.field2);
      console.log('  ✓ Field2 filled');
      
      // Textarea
      await page.fill('textarea[name="description"]', FORM_DATA.description);
      console.log('  ✓ Description filled');
      
      // Example: Select dropdown (standard)
      // await page.selectOption('select[name="category"]', 'option-value');
      // console.log('  ✓ Category selected');
      
      // Example: Select2 dropdown (jQuery plugin)
      // await page.click('span.select2-selection--multiple');
      // await page.waitForTimeout(500);
      // await page.click('li.select2-results__option:has-text("Option Name")');
      // console.log('  ✓ Select2 option selected');
      
      // Example: Checkbox
      // await page.check('input[name="agree"]');
      // console.log('  ✓ Checkbox checked');
      
      // Example: File upload
      // await page.setInputFiles('input[type="file"]', '/path/to/file.png');
      // console.log('  ✓ File uploaded');
      
    } catch (fillError) {
      console.error(`❌ Error filling form: ${fillError.message}`);
      await dumpPageInfo(page, 'form-fill-error');
      throw fillError;
    }
    
    // ========================================
    // STEP 6: Review before submit
    // ========================================
    console.log('\n⏸️  Form filled! Review in browser and press Enter to submit...');
    await new Promise(resolve => {
      process.stdin.once('data', resolve);
    });
    
    // ========================================
    // STEP 7: Submit form
    // ========================================
    console.log('📤 Step 5: Submitting form...');
    await page.click('button[type="submit"], input[type="submit"]');
    
    // Wait for success page (adjust URL pattern)
    await page.waitForURL(/success|confirmation|thank-you/, { timeout: 30000 });
    console.log('✅ Form submitted successfully!\n');
    
    // Take final screenshot
    await page.screenshot({ 
      path: path.join(__dirname, 'page-dumps', 'success.png'),
      fullPage: true 
    });
    
  } catch (error) {
    console.error(`\n❌ Automation failed: ${error.message}\n`);
    await dumpPageInfo(page, 'fatal-error');
    throw error;
    
  } finally {
    console.log('🏁 Closing browser...');
    await browser.close();
  }
}

// ========================================
// RUN AUTOMATION
// ========================================

if (require.main === module) {
  automateFormSubmission()
    .then(() => {
      console.log('✅ Automation completed successfully!');
      process.exit(0);
    })
    .catch(error => {
      console.error('❌ Automation failed:', error);
      process.exit(1);
    });
}

module.exports = { automateFormSubmission, dumpPageInfo };