export default defineEventHandler(async (event) => {
  try {
    const body = await readBody(event);
    const { email } = body;

    if (!email || typeof email !== 'string') {
      throw createError({
        statusCode: 400,
        statusMessage: 'Email is required'
      });
    }

    // Validate email format
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    if (!emailRegex.test(email)) {
      throw createError({
        statusCode: 400,
        statusMessage: 'Invalid email format'
      });
    }

    console.log('[send-verification-email] Processing request for email:', email);

    // Check if user exists in Keycloak
    const { createKeycloakAdminClient } = await import('~/server/utils/keycloak-admin');
    const keycloak = createKeycloakAdminClient();

    let existingUsers;
    try {
      existingUsers = await keycloak.findUserByEmail(email.toLowerCase().trim());
    } catch (error: any) {
      console.error('[send-verification-email] Failed to search users:', error.message);
      throw createError({
        statusCode: 500,
        statusMessage: 'Failed to verify account status'
      });
    }

    if (!existingUsers || existingUsers.length === 0) {
      throw createError({
        statusCode: 404,
        statusMessage: 'No account found with this email address'
      });
    }

    const user = existingUsers[0];

    // Check if user is already verified
    if (user.emailVerified) {
      throw createError({
        statusCode: 400,
        statusMessage: 'This email address is already verified'
      });
    }

    // Rate limiting: check if we recently sent an email to this address
    const rateLimitKey = `verification_email_${email.toLowerCase()}`;
    
    // Simple in-memory rate limiting (in production, use Redis)
    const globalCache = globalThis as any;
    if (!globalCache.verificationEmailCache) {
      globalCache.verificationEmailCache = new Map();
    }
    
    const lastSent = globalCache.verificationEmailCache.get(rateLimitKey);
    const cooldownPeriod = 2 * 60 * 1000; // 2 minutes
    
    if (lastSent && Date.now() - lastSent < cooldownPeriod) {
      throw createError({
        statusCode: 429,
        statusMessage: 'Please wait a few minutes before requesting another verification email'
      });
    }

    // Generate verification token
    const { generateEmailVerificationToken } = await import('~/server/utils/email-tokens');
    const verificationToken = await generateEmailVerificationToken(user.id, email);

    // Get configuration
    const config = useRuntimeConfig();
    const verificationLink = `${config.public.domain}/api/auth/verify-email?token=${verificationToken}`;

    // Send verification email
    const { getEmailService } = await import('~/server/utils/email');
    const emailService = getEmailService();

    try {
      await emailService.sendWelcomeEmail(email, {
        firstName: user.firstName || '',
        lastName: user.lastName || '',
        verificationLink,
        memberId: user.id
      });

      console.log('[send-verification-email] Successfully sent verification email to:', email);

      // Update rate limiting cache
      globalCache.verificationEmailCache.set(rateLimitKey, Date.now());

      // Clean up old rate limit entries periodically
      if (Math.random() < 0.1) { // 10% chance
        const now = Date.now();
        for (const [key, timestamp] of globalCache.verificationEmailCache.entries()) {
          if (now - timestamp > cooldownPeriod * 2) {
            globalCache.verificationEmailCache.delete(key);
          }
        }
      }

      return {
        success: true,
        message: 'Verification email sent successfully'
      };

    } catch (emailError: any) {
      console.error('[send-verification-email] Failed to send email:', emailError.message);
      throw createError({
        statusCode: 500,
        statusMessage: 'Failed to send verification email. Please try again later.'
      });
    }

  } catch (error: any) {
    console.error('[send-verification-email] Request failed:', error.message);

    // Re-throw HTTP errors
    if (error.statusCode) {
      throw error;
    }

    // Handle unexpected errors
    throw createError({
      statusCode: 500,
      statusMessage: 'An unexpected error occurred. Please try again.'
    });
  }
});