// Copyright (c) 2026 Gordon Bolton. MIT License.
/**
 * Converts OpenAPI 3.0 to RAML 1.0 using AMF (amf-client-js)
 * AMF is the modern replacement for deprecated RAML converters.
 */

const { Main, AMFParser, AMFTransformer } = require('amf-client-js');
const fs = require('fs');
const path = require('path');

const INPUT_FILE = path.join(process.cwd(), 'dist/openapi-30.json');
const OUTPUT_FILE = path.join(process.cwd(), 'dist/api.raml');

async function convertToRaml() {
  if (!fs.existsSync(INPUT_FILE)) {
    throw new Error(`Input file not found: ${INPUT_FILE}`);
  }

  console.log('Initializing AMF...');
  await Main.init();

  console.log(`Reading OpenAPI 3.0 spec from ${INPUT_FILE}`);
  const specContent = fs.readFileSync(INPUT_FILE, 'utf-8');

  console.log('Parsing OpenAPI spec...');
  const parser = new AMFParser();
  const model = await parser.parseStringAsync('file://' + INPUT_FILE, specContent, 'application/json');

  console.log('Resolving references...');
  const resolvedModel = await AMFTransformer.resolve(model);

  console.log('Converting to RAML 1.0...');
  const ramlModel = await AMFTransformer.transform(resolvedModel, 'RAML 1.0');

  console.log('Generating RAML output...');
  const ramlContent = await AMFTransformer.generateString(ramlModel, 'application/yaml');

  // Clean up the output - AMF sometimes adds extra formatting
  const cleanedRaml = ramlContent
    .replace('#%RAML 1.0\n', '#%RAML 1.0\n\n')
    .replace(/\n{3,}/g, '\n\n');

  fs.writeFileSync(OUTPUT_FILE, cleanedRaml);
  console.log(`✓ RAML spec written to ${OUTPUT_FILE}`);

  // Basic validation
  if (!cleanedRaml.includes('#%RAML 1.0')) {
    throw new Error('Generated RAML does not appear to be valid RAML 1.0');
  }

  console.log('RAML conversion complete');
}

convertToRaml()
  .then(() => {
    process.exit(0);
  })
  .catch((error) => {
    console.error('Failed to convert to RAML:', error);
    process.exit(1);
  });