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

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

serve(async (req) => {
  if (req.method === 'OPTIONS') {
    return new Response(null, { headers: corsHeaders });
  }

  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) {
      throw new Error('Unauthorized');
    }

    console.log(`Processing deletion request for user: ${user.id}`);

    // Check for existing pending deletion request
    const { data: existingRequest } = await supabaseClient
      .from('account_deletion_requests')
      .select('*')
      .eq('user_id', user.id)
      .eq('status', 'pending')
      .maybeSingle();

    if (existingRequest) {
      return new Response(
        JSON.stringify({
          error: 'You already have a pending deletion request',
          request: existingRequest,
        }),
        {
          status: 400,
          headers: { ...corsHeaders, 'Content-Type': 'application/json' },
        }
      );
    }

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

    if (codeError) {
      throw codeError;
    }

    const confirmationCode = codeData as string;
    const scheduledDeletionAt = new Date();
    scheduledDeletionAt.setDate(scheduledDeletionAt.getDate() + 14);

    // Create deletion request
    const { data: deletionRequest, error: requestError } = await supabaseClient
      .from('account_deletion_requests')
      .insert({
        user_id: user.id,
        confirmation_code: confirmationCode,
        confirmation_code_sent_at: new Date().toISOString(),
        scheduled_deletion_at: scheduledDeletionAt.toISOString(),
        status: 'pending',
      })
      .select()
      .single();

    if (requestError) {
      throw requestError;
    }

    // Deactivate profile
    const { error: profileError } = await supabaseClient
      .from('profiles')
      .update({
        deactivated: true,
        deactivated_at: new Date().toISOString(),
        deactivation_reason: 'User requested account deletion',
      })
      .eq('user_id', user.id);

    if (profileError) {
      throw profileError;
    }

    // Send confirmation email
    const emailPayload = {
      to: user.email,
      subject: 'Account Deletion Requested - Confirmation Code Inside',
      html: `
        <h2>Account Deletion Requested</h2>
        <p>Hello,</p>
        <p>We received a request to delete your account on ${new Date().toLocaleDateString()}.</p>
        
        <h3>IMPORTANT INFORMATION:</h3>
        <p>Your account has been deactivated and will be permanently deleted on <strong>${scheduledDeletionAt.toLocaleDateString()}</strong> (14 days from now).</p>
        
        <h4>What will be DELETED:</h4>
        <ul>
          <li>✗ Your profile information (username, bio, avatar, etc.)</li>
          <li>✗ Your reviews and ratings</li>
          <li>✗ Your personal preferences and settings</li>
        </ul>
        
        <h4>What will be PRESERVED:</h4>
        <ul>
          <li>✓ Your database submissions (park creations, ride additions, edits)</li>
          <li>✓ Photos you've uploaded (will be shown as "Submitted by [deleted user]")</li>
          <li>✓ Edit history and contributions</li>
        </ul>
        
        <h3>CONFIRMATION CODE: <strong>${confirmationCode}</strong></h3>
        <p>To confirm deletion after the 14-day 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 at any time during the next 14 days.</p>
      `,
    };

    // Send via ForwardEmail API
    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: emailPayload.to,
            subject: emailPayload.subject,
            html: emailPayload.html,
          }),
        });
        console.log('Deletion confirmation email sent');
      } catch (emailError) {
        console.error('Failed to send email:', emailError);
      }
    }

    return new Response(
      JSON.stringify({
        success: true,
        message: 'Account deletion request created successfully',
        scheduled_deletion_at: scheduledDeletionAt.toISOString(),
        request_id: deletionRequest.id,
      }),
      {
        status: 200,
        headers: { ...corsHeaders, 'Content-Type': 'application/json' },
      }
    );
  } catch (error) {
    console.error('Error processing deletion request:', error);
    return new Response(
      JSON.stringify({ error: error.message }),
      {
        status: 400,
        headers: { ...corsHeaders, 'Content-Type': 'application/json' },
      }
    );
  }
});