#!/usr/bin/env node

/**
 * Generates build-info.ts with auto-incrementing build number and timestamp.
 * Run before each build: node scripts/generate-build-info.js
 */

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

const BUILD_INFO_PATH = path.join(__dirname, '..', 'constants', 'build-info.ts');

// Read current build number
let buildNumber = 0;
try {
  const existing = fs.readFileSync(BUILD_INFO_PATH, 'utf8');
  const match = existing.match(/BUILD_NUMBER\s*=\s*(\d+)/);
  if (match) {
    buildNumber = parseInt(match[1], 10);
  }
} catch {
  // First build
}

buildNumber++;

const now = new Date();
const timestamp = now.toISOString();
// Short format for UI: "Jan 28, 08:15"
const shortDate = now.toLocaleDateString('en-US', { month: 'short', day: 'numeric' });
const shortTime = now.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', hour12: false });

const content = `// Auto-generated by scripts/generate-build-info.js
// DO NOT EDIT MANUALLY
export const BUILD_NUMBER = ${buildNumber};
export const BUILD_TIMESTAMP = '${timestamp}';
export const BUILD_DISPLAY = 'build ${buildNumber} · ${shortDate}, ${shortTime}';
`;

fs.writeFileSync(BUILD_INFO_PATH, content, 'utf8');
console.log(`Build info generated: #${buildNumber} at ${timestamp}`);