// Copyright (c) 2026 Gordon Bolton. MIT License.
/**
 * Downgrades OpenAPI 3.1.0 to 3.0.0 for compatibility with RAML converters.
 * OpenAPI 3.1 has limited support in existing RAML conversion tools.
 */

const fs = require('fs');
const path = require('path');

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

function downgradeOpenApi30(spec) {
  // Change version from 3.1.0 to 3.0.0
  spec.openapi = '3.0.0';

  // OpenAPI 3.1 uses "type" with array for nullable, 3.0 uses nullable: true
  // This is a simple pass-through for now - complex schemas may need more handling
  // For this spec, most nullable fields are already using 3.0-compatible syntax

  return spec;
}

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

  console.log(`Reading OpenAPI 3.1 spec from ${INPUT_FILE}`);
  const spec = JSON.parse(fs.readFileSync(INPUT_FILE, 'utf-8'));

  console.log('Downgrading to OpenAPI 3.0.0...');
  const downgraded = downgradeOpenApi30(spec);

  fs.writeFileSync(OUTPUT_FILE, JSON.stringify(downgraded, null, 2));
  console.log(`✓ Downgraded spec written to ${OUTPUT_FILE}`);
}

main()
  .then(() => {
    console.log('Downgrade complete');
    process.exit(0);
  })
  .catch((error) => {
    console.error('Failed to downgrade spec:', error);
    process.exit(1);
  });