/**
 * Build script for paste app variants.
 *
 * Usage:
 *   bun run build.ts
 *
 * Produces self-contained HTML files in dist/:
 *   dist/paste-indexeddb.html
 *   dist/paste-sqlite.html
 *   dist/paste-nedb.html
 *
 * Each file is a single self-contained HTML with all JS and CSS inlined.
 *
 * If bun >= 1.3.10, you can also use:
 *   bun build --compile --target=browser ./indexeddb/index.html
 *
 * Docs: https://bun.com/docs/bundler/html-static
 */

import { readFileSync } from 'fs';
import { join, basename } from 'path';

const variants = ['indexeddb', 'sqlite', 'nedb', 'sql-js'] as const;

for (const variant of variants) {
  console.log(`Building paste-${variant}...`);

  const outdir = `./dist/${variant}`;

  const result = await Bun.build({
    entrypoints: [`./${variant}/index.html`],
    outdir,
    target: 'browser',
    minify: true,
  });

  if (!result.success) {
    console.error(`  FAILED: paste-${variant}`);
    for (const log of result.logs) {
      console.error('  ', log);
    }
    process.exit(1);
  }

  // Read the generated HTML and inline all referenced chunks
  const htmlPath = join(outdir, 'index.html');
  let html = readFileSync(htmlPath, 'utf-8');

  // Inline JS chunks: <script type="module" src="./chunk-xxx.js">
  html = html.replace(
    /<script[^>]+src="\.\/([^"]+\.js)"[^>]*><\/script>/g,
    (_match, jsFile) => {
      const jsPath = join(outdir, jsFile);
      try {
        const js = readFileSync(jsPath, 'utf-8');
        return `<script type="module">${js}</script>`;
      } catch {
        console.warn(`  Warning: could not inline ${jsFile}`);
        return _match;
      }
    },
  );

  // Inline CSS chunks: <link rel="stylesheet" href="./chunk-xxx.css">
  html = html.replace(
    /<link[^>]+href="\.\/([^"]+\.css)"[^>]*\/?>/g,
    (_match, cssFile) => {
      const cssPath = join(outdir, cssFile);
      try {
        const css = readFileSync(cssPath, 'utf-8');
        return `<style>${css}</style>`;
      } catch {
        console.warn(`  Warning: could not inline ${cssFile}`);
        return _match;
      }
    },
  );

  // Write the single self-contained HTML
  const outFile = `./dist/paste-${variant}.html`;
  await Bun.write(outFile, html);
  console.log(`  OK: ${outFile}`);
}

// Copy sqlite3.wasm to dist/ (needed for SQLite variant over HTTP)
const wasmSrc = '../sqlite/node_modules/@sqlite.org/sqlite-wasm/dist/sqlite3.wasm';
const wasmDst = './dist/sqlite3.wasm';
try {
  const wasmFile = Bun.file(wasmSrc);
  if (await wasmFile.exists()) {
    await Bun.write(wasmDst, wasmFile);
    console.log(`\nCopied sqlite3.wasm (${Math.round(wasmFile.size! / 1024)}KB) to dist/`);
  }
} catch {
  console.warn('\nWarning: could not copy sqlite3.wasm — run `npm install` in sqlite/ first');
}

console.log('\nAll builds complete. Single-file HTMLs in paste/dist/');
console.log('Note: paste-sqlite.html requires HTTP — run `bun run serve.ts`');