#!/usr/bin/env node

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

// Ensure output directory exists
const outdir = path.join(__dirname, '..', 'public', 'dist');
if (!fs.existsSync(outdir)) {
  fs.mkdirSync(outdir, { recursive: true });
}

// Build configuration
const buildOptions = {
  entryPoints: [
    // Main app bundles
    'src/frontend/app-main.ts',
    'src/frontend/app-admin.ts',
    'src/frontend/app-privacy.ts',
    
    // Shared components will be imported by the above
  ],
  bundle: true,
  outdir: outdir,
  format: 'iife', // Immediately Invoked Function Expression for browsers
  platform: 'browser',
  target: ['es2020'], // Modern browsers, matching our TypeScript target
  sourcemap: process.env.NODE_ENV !== 'production',
  minify: process.env.NODE_ENV === 'production',
  loader: {
    '.ts': 'ts',
  },
  define: {
    'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'development')
  },
  // Don't bundle these - they'll be loaded from CDN
  external: ['leaflet'],
};

// Build function
async function build() {
  const isWatch = process.argv.includes('--watch');
  
  try {
    if (isWatch) {
      // Watch mode for development
      const ctx = await esbuild.context(buildOptions);
      await ctx.watch();
      console.log('👀 Watching for frontend changes...');
    } else {
      // One-time build
      console.log('🔨 Building frontend...');
      const result = await esbuild.build(buildOptions);
      console.log('✅ Frontend build complete!');
      
      if (result.errors.length > 0) {
        console.error('❌ Build errors:', result.errors);
        process.exit(1);
      }
    }
  } catch (error) {
    console.error('❌ Build failed:', error);
    process.exit(1);
  }
}

// Run the build
build();