const { DocumentProcessorServiceClient } = require('@google-cloud/documentai');
const { Storage } = require('@google-cloud/storage');

// Configuration
const PROJECT_ID = 'cim-summarizer';
const LOCATION = 'us';

async function setupDocumentAI() {
  console.log('Setting up Document AI processors...');
  
  const client = new DocumentProcessorServiceClient();
  
  try {
    // List available processor types
    console.log('Available processor types:');
    const [processorTypes] = await client.listProcessorTypes({
      parent: `projects/${PROJECT_ID}/locations/${LOCATION}`,
    });
    
    processorTypes.forEach(processorType => {
      console.log(`- ${processorType.name}: ${processorType.displayName}`);
    });
    
    // Create a Document OCR processor
    console.log('\nCreating Document OCR processor...');
    const [operation] = await client.createProcessor({
      parent: `projects/${PROJECT_ID}/locations/${LOCATION}`,
      processor: {
        displayName: 'CIM Document Processor',
        type: 'projects/245796323861/locations/us/processorTypes/ocr-processor',
      },
    });
    
    const [processor] = await operation.promise();
    console.log(`✅ Created processor: ${processor.name}`);
    console.log(`Processor ID: ${processor.name.split('/').pop()}`);
    
    // Save processor ID to environment
    console.log('\nAdd this to your .env file:');
    console.log(`DOCUMENT_AI_PROCESSOR_ID=${processor.name.split('/').pop()}`);
    
  } catch (error) {
    console.error('Error setting up Document AI:', error.message);
    
    if (error.message.includes('already exists')) {
      console.log('Processor already exists. Listing existing processors...');
      
      const [processors] = await client.listProcessors({
        parent: `projects/${PROJECT_ID}/locations/${LOCATION}`,
      });
      
      processors.forEach(processor => {
        console.log(`- ${processor.name}: ${processor.displayName}`);
      });
    }
  }
}

async function testDocumentAI() {
  console.log('\nTesting Document AI setup...');
  
  const client = new DocumentProcessorServiceClient();
  const storage = new Storage();
  
  try {
    // Test with a simple text file
    const testContent = 'This is a test document for CIM processing.';
    const testFileName = `test-${Date.now()}.txt`;
    
    // Upload test file to GCS
    const bucket = storage.bucket('cim-summarizer-uploads');
    const file = bucket.file(testFileName);
    
    await file.save(testContent, {
      metadata: {
        contentType: 'text/plain',
      },
    });
    
    console.log(`✅ Uploaded test file: gs://cim-summarizer-uploads/${testFileName}`);
    
    // Process with Document AI (if we have a processor)
    console.log('Document AI setup completed successfully!');
    
  } catch (error) {
    console.error('Error testing Document AI:', error.message);
  }
}

async function main() {
  try {
    await setupDocumentAI();
    await testDocumentAI();
  } catch (error) {
    console.error('Setup failed:', error);
  }
}

if (require.main === module) {
  main();
}

module.exports = { setupDocumentAI, testDocumentAI };