import { serve } from 'https://deno.land/std@0.168.0/http/server.ts';
import { createClient } from 'https://esm.sh/@supabase/supabase-js@2';
import { edgeLogger, startRequest, endRequest } from '../_shared/logger.ts';

const corsHeaders = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type',
};

serve(async (req) => {
  const tracking = startRequest();
  
  if (req.method === 'OPTIONS') {
    return new Response(null, { 
      headers: { 
        ...corsHeaders,
        'X-Request-ID': tracking.requestId 
      } 
    });
  }

  try {
    const supabaseClient = createClient(
      Deno.env.get('SUPABASE_URL') ?? '',
      Deno.env.get('SUPABASE_ANON_KEY') ?? '',
      {
        global: {
          headers: { Authorization: req.headers.get('Authorization')! },
        },
      }
    );

    // Get authenticated user
    const {
      data: { user },
      error: userError,
    } = await supabaseClient.auth.getUser();

    if (userError || !user) {
      const duration = endRequest(tracking);
      edgeLogger.error('Authentication failed', { 
        action: 'resend_deletion_code',
        requestId: tracking.requestId,
        duration 
      });
      throw new Error('Unauthorized');
    }

    edgeLogger.info('Resending deletion code for user', { 
      action: 'resend_deletion_code',
      requestId: tracking.requestId,
      userId: user.id 
    });

    // Find pending deletion request
    const { data: deletionRequest, error: requestError } = await supabaseClient
      .from('account_deletion_requests')
      .select('*')
      .eq('user_id', user.id)
      .eq('status', 'pending')
      .maybeSingle();

    if (requestError || !deletionRequest) {
      throw new Error('No pending deletion request found');
    }

    // Check rate limiting (max 3 resends per hour)
    const lastSent = new Date(deletionRequest.confirmation_code_sent_at);
    const now = new Date();
    const hoursSinceLastSend = (now.getTime() - lastSent.getTime()) / (1000 * 60 * 60);

    if (hoursSinceLastSend < 0.33) { // ~20 minutes between resends
      throw new Error('Please wait at least 20 minutes between resend requests');
    }

    // Generate new confirmation code
    const { data: codeData, error: codeError } = await supabaseClient
      .rpc('generate_deletion_confirmation_code');

    if (codeError) {
      throw codeError;
    }

    const confirmationCode = codeData as string;

    // Update deletion request with new code
    const { error: updateError } = await supabaseClient
      .from('account_deletion_requests')
      .update({
        confirmation_code: confirmationCode,
        confirmation_code_sent_at: now.toISOString(),
      })
      .eq('id', deletionRequest.id);

    if (updateError) {
      throw updateError;
    }

    const scheduledDate = new Date(deletionRequest.scheduled_deletion_at);

    // Send email with new code
    const forwardEmailKey = Deno.env.get('FORWARDEMAIL_API_KEY');
    const fromEmail = Deno.env.get('FROM_EMAIL_ADDRESS') || 'noreply@thrillwiki.com';

    if (forwardEmailKey) {
      try {
        await fetch('https://api.forwardemail.net/v1/emails', {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json',
            'Authorization': `Basic ${btoa(forwardEmailKey + ':')}`,
          },
          body: JSON.stringify({
            from: fromEmail,
            to: user.email,
            subject: 'Account Deletion - New Confirmation Code',
            html: `
              <h2>New Confirmation Code</h2>
              <p>You requested a new confirmation code for your account deletion.</p>
              <p>Your account will be permanently deleted on <strong>${scheduledDate.toLocaleDateString()}</strong>.</p>
              
              <h3>CONFIRMATION CODE: <strong>${confirmationCode}</strong></h3>
              <p>To confirm deletion after the waiting period, you'll need to enter this 6-digit code.</p>
              
              <p><strong>Need to cancel?</strong> Log in and visit your account settings to reactivate your account.</p>
            `,
          }),
        });
        edgeLogger.info('New confirmation code email sent', { requestId: tracking.requestId });
      } catch (emailError) {
        edgeLogger.error('Failed to send email', { 
          requestId: tracking.requestId,
          error: emailError.message
        });
      }
    }

    const duration = endRequest(tracking);
    edgeLogger.info('New confirmation code sent successfully', { 
      action: 'resend_deletion_code',
      requestId: tracking.requestId,
      userId: user.id,
      duration 
    });

    return new Response(
      JSON.stringify({
        success: true,
        message: 'New confirmation code sent successfully',
        requestId: tracking.requestId,
      }),
      {
        status: 200,
        headers: { 
          ...corsHeaders, 
          'Content-Type': 'application/json',
          'X-Request-ID': tracking.requestId 
        },
      }
    );
  } catch (error) {
    const duration = endRequest(tracking);
    edgeLogger.error('Error resending code', { 
      action: 'resend_deletion_code',
      requestId: tracking.requestId,
      duration,
      error: error.message 
    });
    return new Response(
      JSON.stringify({ 
        error: error.message,
        requestId: tracking.requestId 
      }),
      {
        status: 400,
        headers: { 
          ...corsHeaders, 
          'Content-Type': 'application/json',
          'X-Request-ID': tracking.requestId 
        },
      }
    );
  }
});