thrilltrack-explorer/supabase/functions/process-selective-approval/index.ts

import { serve } from 'https://deno.land/std@0.168.0/http/server.ts';
import { createClient } from 'https://esm.sh/@supabase/supabase-js@2.57.4';

const SUPABASE_URL = Deno.env.get('SUPABASE_URL') || 'https://api.thrillwiki.com';
const SUPABASE_ANON_KEY = Deno.env.get('SUPABASE_ANON_KEY')!;

interface ApprovalRequest {
  submissionId: string;
  itemIds: string[];
  idempotencyKey: string;
}

serve(async (req) => {
  // Generate request ID for tracking
  const requestId = crypto.randomUUID();
  
  try {
    // STEP 1: Authentication
    const authHeader = req.headers.get('Authorization');
    if (!authHeader) {
      return new Response(
        JSON.stringify({ error: 'Missing Authorization header' }),
        { status: 401, headers: { 'Content-Type': 'application/json' } }
      );
    }

    const supabase = createClient(SUPABASE_URL, SUPABASE_ANON_KEY, {
      global: { headers: { Authorization: authHeader } }
    });

    const { data: { user }, error: authError } = await supabase.auth.getUser();
    if (authError || !user) {
      return new Response(
        JSON.stringify({ error: 'Unauthorized' }),
        { status: 401, headers: { 'Content-Type': 'application/json' } }
      );
    }

    console.log(`[${requestId}] Approval request from moderator ${user.id}`);

    // STEP 2: Parse request
    const body: ApprovalRequest = await req.json();
    const { submissionId, itemIds, idempotencyKey } = body;

    if (!submissionId || !itemIds || itemIds.length === 0) {
      return new Response(
        JSON.stringify({ error: 'Missing required fields: submissionId, itemIds' }),
        { status: 400, headers: { 'Content-Type': 'application/json' } }
      );
    }

    // STEP 3: Idempotency check
    const { data: existingKey } = await supabase
      .from('submission_idempotency_keys')
      .select('*')
      .eq('idempotency_key', idempotencyKey)
      .single();

    if (existingKey?.status === 'completed') {
      console.log(`[${requestId}] Idempotency key already processed, returning cached result`);
      return new Response(
        JSON.stringify(existingKey.result_data),
        {
          status: 200,
          headers: {
            'Content-Type': 'application/json',
            'X-Cache-Status': 'HIT'
          }
        }
      );
    }

    // STEP 4: Fetch submission to get submitter_id
    const { data: submission, error: submissionError } = await supabase
      .from('content_submissions')
      .select('user_id, status, assigned_to')
      .eq('id', submissionId)
      .single();

    if (submissionError || !submission) {
      console.error(`[${requestId}] Submission not found:`, submissionError);
      return new Response(
        JSON.stringify({ error: 'Submission not found' }),
        { status: 404, headers: { 'Content-Type': 'application/json' } }
      );
    }

    // STEP 5: Verify moderator can approve this submission
    if (submission.assigned_to && submission.assigned_to !== user.id) {
      console.error(`[${requestId}] Submission locked by another moderator`);
      return new Response(
        JSON.stringify({ error: 'Submission is locked by another moderator' }),
        { status: 409, headers: { 'Content-Type': 'application/json' } }
      );
    }

    if (!['pending', 'partially_approved'].includes(submission.status)) {
      console.error(`[${requestId}] Invalid submission status: ${submission.status}`);
      return new Response(
        JSON.stringify({ error: 'Submission already processed' }),
        { status: 400, headers: { 'Content-Type': 'application/json' } }
      );
    }

    // STEP 6: Register idempotency key as processing
    if (!existingKey) {
      await supabase.from('submission_idempotency_keys').insert({
        idempotency_key: idempotencyKey,
        submission_id: submissionId,
        moderator_id: user.id,
        status: 'processing'
      });
    }

    console.log(`[${requestId}] Calling process_approval_transaction RPC`);

    // ============================================================================
    // STEP 7: Call RPC function - entire approval in single atomic transaction
    // ============================================================================
    const { data: result, error: rpcError } = await supabase.rpc(
      'process_approval_transaction',
      {
        p_submission_id: submissionId,
        p_item_ids: itemIds,
        p_moderator_id: user.id,
        p_submitter_id: submission.user_id,
        p_request_id: requestId
      }
    );

    if (rpcError) {
      // Transaction failed - EVERYTHING rolled back automatically by PostgreSQL
      console.error(`[${requestId}] Approval transaction failed:`, rpcError);

      // Update idempotency key to failed
      await supabase
        .from('submission_idempotency_keys')
        .update({
          status: 'failed',
          error_message: rpcError.message,
          completed_at: new Date().toISOString()
        })
        .eq('idempotency_key', idempotencyKey);

      return new Response(
        JSON.stringify({
          error: 'Approval transaction failed',
          message: rpcError.message,
          details: rpcError.details
        }),
        { status: 500, headers: { 'Content-Type': 'application/json' } }
      );
    }

    console.log(`[${requestId}] Transaction completed successfully:`, result);

    // STEP 8: Success - update idempotency key
    await supabase
      .from('submission_idempotency_keys')
      .update({
        status: 'completed',
        result_data: result,
        completed_at: new Date().toISOString()
      })
      .eq('idempotency_key', idempotencyKey);

    return new Response(
      JSON.stringify(result),
      {
        status: 200,
        headers: {
          'Content-Type': 'application/json',
          'X-Request-Id': requestId
        }
      }
    );

  } catch (error) {
    console.error(`[${requestId}] Unexpected error:`, error);
    return new Response(
      JSON.stringify({
        error: 'Internal server error',
        message: error instanceof Error ? error.message : 'Unknown error'
      }),
      { status: 500, headers: { 'Content-Type': 'application/json' } }
    );
  }
});