import fp from 'fastify-plugin';
import swagger from '@fastify/swagger';
import swaggerUI from '@fastify/swagger-ui';
import { readFileSync } from 'fs';
import { join } from 'path';
import { fileURLToPath } from 'url';
import { dirname } from 'path';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

export default fp(async (fastify) => {
  // Load OpenAPI spec
  const openAPISpec = JSON.parse(
    readFileSync(join(__dirname, '../openapi.json'), 'utf-8')
  );

  // Register Swagger plugin
  await fastify.register(swagger, {
    mode: 'static',
    specification: {
      document: openAPISpec
    },
  });

  // Register Swagger UI
  await fastify.register(swaggerUI, {
    routePrefix: '/docs',
    uiConfig: {
      docExpansion: 'list',
      deepLinking: true,
      displayRequestDuration: true,
      filter: true,
      showExtensions: true,
      showCommonExtensions: true,
      tryItOutEnabled: true,
    },
    staticCSP: true,
    transformStaticCSP: (header) => header,
    transformSpecification: (swaggerObject) => {
      return swaggerObject;
    },
    transformSpecificationClone: true,
  });

  // Serve OpenAPI spec as JSON endpoint
  fastify.get('/openapi.json', async () => {
    return openAPISpec;
  });

  fastify.log.info('📚 Swagger UI available at /docs');
  fastify.log.info('📄 OpenAPI spec available at /openapi.json');
});