#!/usr/bin/env node

/**
 * OpenAPI Documentation Bundler - Node.js Version
 * 
 * This script merges the modular OpenAPI specification files into a single
 * api-docs.bundled.yaml file that can be served to Swagger UI.
 * 
 * It merges paths from the paths/ directory and then uses Redocly CLI to resolve
 * all $ref references into inline definitions.
 * 
 * Usage: node bundle-api-docs.js
 */

const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const publicDir = __dirname;
const pathsDir = path.join(publicDir, 'paths');
const tempFile = path.join(publicDir, 'api-docs.merged.yaml');
const outputFile = path.join(publicDir, 'api-docs.bundled.yaml');

// Read the base api-docs.yaml
const apiDocsPath = path.join(publicDir, 'api-docs.yaml');
let apiDocsContent = fs.readFileSync(apiDocsPath, 'utf8');

// Parse YAML manually (simple approach - looking for paths: {})
const pathsMatch = apiDocsContent.match(/^paths:\s*\{\}/m);
if (!pathsMatch) {
  console.error('Could not find empty paths section in api-docs.yaml');
  process.exit(1);
}

// Read all path files
const pathFiles = fs.readdirSync(pathsDir)
  .filter(f => f.endsWith('.yaml'))
  .map(f => path.join(pathsDir, f));

console.log(`Found ${pathFiles.length} path files to merge...`);

// Merge all paths content
let mergedPaths = [];
for (const filepath of pathFiles) {
  const filename = path.basename(filepath);
  try {
    let content = fs.readFileSync(filepath, 'utf8');
    // Fix relative paths: ../components/ -> ./components/
    // because paths are now at the root level after merging
    content = content.replace(/\.\.\/components\//g, './components/');
    mergedPaths.push(`# From: ${filename}\n${content}`);
    console.log(`  [OK] Merged paths from ${filename}`);
  } catch (e) {
    console.log(`  [WARN] Failed to read ${filename}: ${e.message}`);
  }
}

// Replace empty paths with merged paths
const pathsYaml = mergedPaths.join('\n\n');
const mergedContent = apiDocsContent.replace(
  /^paths:\s*\{\}/m,
  `paths:\n${pathsYaml.split('\n').map(line => '  ' + line).join('\n')}`
);

// Write merged file (still has $refs)
fs.writeFileSync(tempFile, mergedContent, 'utf8');
console.log(`\n[SUCCESS] Merged paths into: ${tempFile}`);

// Now use Redocly CLI to resolve all $ref references
console.log('\nResolving $ref references with Redocly CLI...');
try {
  const runBundle = (cmd) => execSync(cmd, { cwd: publicDir, stdio: 'inherit' });

  try {
    runBundle(`redocly bundle "${tempFile}" -o "${outputFile}"`);
  } catch (e) {
    // Fallback: use npx if redocly isn't installed globally
    runBundle(`npx --yes @redocly/cli bundle "${tempFile}" -o "${outputFile}"`);
  }
  
  console.log(`\n[SUCCESS] Resolved all $ref references to: ${outputFile}`);
  
  // Clean up temp file
  fs.unlinkSync(tempFile);
  console.log(`[CLEANUP] Removed temp file: ${tempFile}`);
  
  // Show stats
  const stats = fs.statSync(outputFile);
  console.log(`\n${'='.repeat(60)}`);
  console.log('Bundling complete!');
  console.log(`  Output: ${outputFile}`);
  console.log(`  Size: ${(stats.size / 1024).toFixed(1)} KB`);
  console.log(`\nYou can now serve this file to Swagger UI.`);
  console.log(`${'='.repeat(60)}`);
  
} catch (e) {
  console.error(`\n[ERROR] Failed to run Redocly CLI: ${e.message}`);
  console.error('Make sure Redocly CLI is installed (global or via npx): npm install -g @redocly/cli');
  process.exit(1);
}