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;

const now = new Date();
const dateTimeFormat = new Intl.DateTimeFormat('sk-SK', {
  year: 'numeric', month: '2-digit', day: '2-digit',
  hour: '2-digit', minute: '2-digit', second: '2-digit',
  hour12: false
});

const parts = dateTimeFormat.formatToParts(now);
let day = '', month = '', year = '', hour = '', minute = '', second = '';

parts.forEach(part => {
  switch (part.type) {
    case 'day': day = part.value; break;
    case 'month': month = part.value; break;
    case 'year': year = part.value; break;
    case 'hour': hour = part.value; break;
    case 'minute': minute = part.value; break;
    case 'second': second = part.value; break;
  }
});

// Assemble the date part without unwanted spaces
const appBuildTime = `${day}.${month}.${year} ${hour}:${minute}:${second}`;

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')
      },
      output: {
        entryFileNames: assetInfo => {
          if (assetInfo.name === 'sw') {
            return 'service-worker.js';
          }
          return 'assets/[name]-[hash].js';
        },
        chunkFileNames: 'assets/[name]-[hash].js',
        assetFileNames: 'assets/[name]-[hash].[ext]',
      }
    },
    emptyOutDir: true, 
  }
});