import { defineConfig } from 'vite';
import vue from '@vitejs/plugin-vue';
import fs from 'fs';
import { resolve } from 'path';

const packageJson = JSON.parse(fs.readFileSync('./package.json', 'utf8'));
const appVersion = packageJson.version;

// Options for date formatting
const dateTimeFormatOptions = {
  year: 'numeric', month: '2-digit', day: '2-digit',
  hour: '2-digit', minute: '2-digit', second: '2-digit',
  hour12: false // Use 24-hour format
};
// Generate build time string using Slovak locale
const appBuildTime = new Date().toLocaleString('sk-SK', dateTimeFormatOptions);


export default defineConfig({
  plugins: [vue()],
  server: {
    port: 8080
   },
  define: {
    'import.meta.env.VITE_APP_BUILD_TIME': JSON.stringify(appBuildTime),
    '__APP_CACHE_VERSION__': JSON.stringify(`nexus-timer-cache-v${appVersion}-${Date.now()}`)
  },
  build: {
    rollupOptions: {
      input: {
        main: resolve(__dirname, 'index.html'),
        sw: resolve(__dirname, 'src/sw.js') // Assuming sw.js is now in src
      },
      output: {
        entryFileNames: assetInfo => {
          // Output service-worker.js to the root of the dist directory
          if (assetInfo.name === 'sw') {
            return 'service-worker.js'; // Ensure consistent name
          }
          // Default naming for other entry points/chunks
          return 'assets/[name]-[hash].js';
        },
        // For chunks, if any are generated from sw.js (unlikely for simple SW)
        chunkFileNames: 'assets/[name]-[hash].js',
        assetFileNames: 'assets/[name]-[hash].[ext]',
      }
    },
    // Set to false if you don't want to empty the dist dir on each build
    // but usually true is good for clean builds.
    emptyOutDir: true, 
  }
});