#!/usr/bin/env node
/**
 * Auto-generates integration feature mappings by scanning the filesystem.
 * 
 * This script scans content/docs/integrations/ to detect which integrations
 * have which feature pages (e.g., shared-state, generative-ui, etc.) and
 * generates lib/integration-features.ts with type-safe mappings.
 * 
 * Runs automatically:
 * - Before every `pnpm dev` (via predev script)
 * - Before every `pnpm build` (via prebuild script)
 * - Manually via `pnpm generate`
 * 
 * To add a feature to an integration, just create the directory/file:
 *   mkdir content/docs/integrations/my-framework/shared-state
 *   # Next build will auto-detect it!
 * 
 * See docs/README.md for full documentation.
 */

import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const docsRoot = path.resolve(__dirname, '..');
const integrationsDir = path.join(docsRoot, 'content/docs/integrations');

// Features to check for (can be either directories or .mdx files)
// For each feature, we check for BOTH:
//   1. A directory with that name (e.g., shared-state/)
//   2. A file with that name (e.g., frontend-actions.mdx)
// The route is the same either way: /integration/feature-name
const FEATURES = [
  'shared-state',
  'generative-ui',
  'generative-ui/render-only',
  'generative-ui/tool-rendering',
  'generative-ui/state-rendering',
  'generative-ui/mcp-apps',
  'generative-ui/a2ui',
  'frontend-actions',
  'human-in-the-loop',
  'agentic-chat-ui',
  'custom-look-and-feel',
];

// Valid integration IDs — must match INTEGRATION_ORDER in lib/integrations.ts
const VALID_INTEGRATIONS = new Set([
  'direct-to-llm', 'langgraph', 'deepagents', 'adk', 'microsoft-agent-framework',
  'aws-strands', 'mastra', 'pydantic-ai', 'crewai-flows', 'agno',
  'ag2', 'agent-spec', 'llamaindex', 'a2a',
]);

function getIntegrations() {
  return fs.readdirSync(integrationsDir, { withFileTypes: true })
    .filter(dirent => dirent.isDirectory() && VALID_INTEGRATIONS.has(dirent.name))
    .map(dirent => dirent.name);
}

function hasFeature(integrationId, featureName) {
  const integrationPath = path.join(integrationsDir, integrationId);
  
  // Check for directory (e.g., shared-state/)
  const featureDir = path.join(integrationPath, featureName);
  if (fs.existsSync(featureDir) && fs.statSync(featureDir).isDirectory()) {
    return true;
  }
  
  // Check for file (e.g., frontend-actions.mdx)
  const featureFile = path.join(integrationPath, `${featureName}.mdx`);
  if (fs.existsSync(featureFile)) {
    return true;
  }
  
  return false;
}

function generateFeatureMap() {
  const integrations = getIntegrations();
  const featureMap = {};
  
  // For each feature, list which integrations have it
  for (const featureName of FEATURES) {
    featureMap[featureName] = integrations.filter(id => 
      hasFeature(id, featureName)
    );
  }
  
  return featureMap;
}

function main() {
  const featureMap = generateFeatureMap();
  
  const output = `// Auto-generated by scripts/generate-integration-features.mjs
// Do not edit manually - run: node scripts/generate-integration-features.mjs

import { IntegrationId } from './integrations';

/**
 * Maps feature names to the list of integration IDs that have that feature.
 * This is auto-generated at build time by scanning the content/docs/integrations directory.
 */
export const INTEGRATION_FEATURES: Record<string, IntegrationId[]> = ${JSON.stringify(featureMap, null, 2)};

/**
 * Check if an integration has a specific feature page.
 */
export function hasIntegrationFeature(integrationId: IntegrationId, feature: string): boolean {
  return INTEGRATION_FEATURES[feature]?.includes(integrationId) ?? false;
}
`;

  const outputPath = path.join(docsRoot, 'lib/integration-features.ts');
  fs.writeFileSync(outputPath, output);
  
  console.log('✓ Generated lib/integration-features.ts');
  console.log(`  Features mapped: ${Object.keys(featureMap).length}`);
  console.log(`  Integrations scanned: ${getIntegrations().length}`);
}

main();