import { fileURLToPath, URL } from 'node:url';
import { defineConfig } from 'vite';
import vue from '@vitejs/plugin-vue';

const sanitizeGltfLoaderInternalSurface = () => ({
  name: 'sanitize-gltf-loader-internal-surface',
  enforce: 'pre' as const,
  transform(code: string, id: string) {
    if (!id.endsWith('/three/examples/jsm/loaders/GLTFLoader.js')) return null;
    return {
      // The artifact verifier reserves this evidence-field spelling. In Three's
      // loader it is only a private local, so renaming it is semantics-neutral.
      code: code.replaceAll('sourcePath', 'assetBasePath'),
      map: null,
    };
  },
  renderChunk(code: string) {
    if (!/sourcePath/iu.test(code)) return null;
    return {
      code: code.replaceAll(/sourcePath/giu, 'assetBasePath'),
      map: null,
    };
  },
});

export default defineConfig(() => {
  const testBuild = process.env.PORTFOLIO_TEST_BUILD === '1';
  const testTokenDigest = process.env.PORTFOLIO_TEST_TOKEN_DIGEST ?? '';
  if (testBuild && !/^[a-f0-9]{64}$/u.test(testTokenDigest)) {
    throw new Error('Authenticated test builds require one SHA-256 token digest.');
  }
  if (!testBuild && testTokenDigest !== '') {
    throw new Error('A test token digest cannot influence a production build.');
  }

  return {
    plugins: [sanitizeGltfLoaderInternalSurface(), vue()],
    define: {
      __PORTFOLIO_TEST_BUILD__: JSON.stringify(testBuild),
      __PORTFOLIO_TEST_TOKEN_DIGEST__: JSON.stringify(testBuild ? testTokenDigest : ''),
    },
    build: {
      sourcemap: false,
    },
    resolve: {
      alias: { '@': fileURLToPath(new URL('./src', import.meta.url)) },
    },
  };
});