#!/usr/bin/env node
/**
 * Postinstall fix: patch remove-scoped.js to guard unsafe `.spaces` access.
 *
 * Root cause: remove-scoped.js in @dcloudio/vue-cli-plugin-uni accesses
 * `selector.first.spaces.before` without checking if `selector.first` exists.
 * When postcss-selector-parser produces an empty selector (e.g. from certain
 * CSS edge cases), this crashes with:
 *   "TypeError: Cannot read properties of undefined (reading 'spaces')"
 *
 * The fix adds a guard before accessing .spaces on selector.first.
 *
 * Patches BOTH:
 *   1. Project local node_modules (for vue-cli-service / npm build)
 *   2. HBuilderX bundled uniapp-cli (for HBuilderX build)
 */

const fs = require('fs');
const path = require('path');

/** Find all remove-scoped.js files to patch */
function findRemoveScopedFiles() {
  const files = [];

  // 1. Project local node_modules
  const localPath = path.join(__dirname, 'node_modules', '@dcloudio',
    'vue-cli-plugin-uni', 'packages', '@vue', 'component-compiler-utils',
    'dist', 'stylePlugins', 'remove-scoped.js');
  if (fs.existsSync(localPath)) files.push(localPath);

  // 2. HBuilderX bundled uniapp-cli (common install paths)
  const hbxPaths = [
    'E:\\develop\\HBuilderX\\plugins\\uniapp-cli',
    'C:\\Program Files\\HBuilderX\\plugins\\uniapp-cli',
    'C:\\Program Files (x86)\\HBuilderX\\plugins\\uniapp-cli',
    path.join(process.env.LOCALAPPDATA || '', 'Programs', 'HBuilderX', 'plugins', 'uniapp-cli'),
  ];
  for (const base of hbxPaths) {
    const hbxPath = path.join(base, 'node_modules', '@dcloudio',
      'vue-cli-plugin-uni', 'packages', '@vue', 'component-compiler-utils',
      'dist', 'stylePlugins', 'remove-scoped.js');
    if (fs.existsSync(hbxPath)) files.push(hbxPath);
  }

  return files;
}

/** Patch a single remove-scoped.js file */
function patchFile(filePath) {
  let content = fs.readFileSync(filePath, 'utf8');

  // Fix: selector.first.spaces.before = ''; → if (selector.first) { ... }
  if (content.includes("selector.first.spaces.before = '';")) {
    content = content.replace(
      /selector\.first\.spaces\.before = '';/,
      "if (selector.first) { selector.first.spaces.before = ''; }"
    );
    fs.writeFileSync(filePath, content, 'utf8');
    console.log(`  ✅ ${filePath}`);
    return true;
  } else if (content.includes("if (selector.first) { selector.first.spaces.before = ''; }")) {
    console.log(`  ⏭️  ${filePath} (already patched)`);
    return true;
  } else {
    console.log(`  ❌ ${filePath} (unexpected format)`);
    return false;
  }
}

// Main
const files = findRemoveScopedFiles();
if (files.length === 0) {
  console.log('remove-scoped.js not found in any location, skipping patch');
  process.exit(0);
}

console.log(`Found ${files.length} remove-scoped.js to patch:`);
let patched = 0;
for (const f of files) {
  if (patchFile(f)) patched++;
}
console.log(`Done: ${patched}/${files.length} patched`);