/**
 * Vite config for the Chrome extension.
 * Builds the extension into dist/ for loading as an unpacked extension.
 *
 * Usage:
 *   npm run dev    — watch mode, rebuild on change
 *   npm run build  — production build
 */
import { defineConfig } from 'vite';
import { resolve } from 'path';
import { copyFileSync, mkdirSync, writeFileSync } from 'fs';
import sharp from 'sharp';

export default defineConfig({
  root: 'src',
  plugins: [
    {
      name: 'generate-icons',
      async generateBundle() {
        const outDir = resolve(__dirname, 'dist');
        mkdirSync(resolve(outDir, 'icons'), { recursive: true });

        const sizes = [16, 48, 128];
        const svgPath = resolve(__dirname, 'src/icons/icon.svg');
        const outDirs = [
          resolve(outDir, 'icons'),
          resolve(__dirname, 'icons'),
        ];

        for (const size of sizes) {
          const buffer = await sharp(svgPath)
            .resize(size, size)
            .png()
            .toBuffer();
          for (const dir of outDirs) {
            mkdirSync(dir, { recursive: true });
            writeFileSync(resolve(dir, `icon${size}.png`), buffer);
          }
        }
      },
    },
    {
      name: 'copy-manifest',
      generateBundle() {
        const manifestPath = resolve(__dirname, 'manifest.json');
        const outPath = resolve(__dirname, 'dist/manifest.json');
        copyFileSync(manifestPath, outPath);
      },
    },
  ],
  build: {
    outDir: '../dist',
    emptyOutDir: true,
    rollupOptions: {
      input: {
        background: resolve(__dirname, 'src/background/background.js'),
        content: resolve(__dirname, 'src/content/content.js'),
        viewer: resolve(__dirname, 'src/viewer/viewer.html'),
        viewerIndex: resolve(__dirname, 'src/viewer/index.html'),
      },
      output: {
        entryFileNames: '[name].js',
        chunkFileNames: 'chunks/[name].js',
        assetFileNames: '[name][extname]',
      },
    },
  },
});