#!/usr/bin/env node

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

// Vue 3 migration patterns
const migrationPatterns = [
  // Replace iView with ViewUIPlus
  { from: /import\s+{\s*([^}]+)\s*}\s+from\s+['"]iview['"]/g, to: "import { $1 } from 'view-ui-plus'" },
  { from: /import\s+iView\s+from\s+['"]iview['"]/g, to: "import ViewUIPlus from 'view-ui-plus'" },
  { from: /this\.\$Message/g, to: "this.$Message" },
  { from: /this\.\$Modal/g, to: "this.$Modal" },
  { from: /this\.\$Notice/g, to: "this.$Notice" },
  { from: /this\.\$Spin/g, to: "this.$Spin" },
  
  // Replace component names
  { from: /<i-/g, to: "<" },
  { from: /<\/i-/g, to: "</" },
  
  // Vue 3 event bus
  { from: /this\.\$eventBus\.\$emit/g, to: "this.$eventBus.emit" },
  { from: /this\.\$eventBus\.\$on/g, to: "this.$eventBus.on" },
  { from: /this\.\$eventBus\.\$off/g, to: "this.$eventBus.off" },
  
  // Vue 3 slots
  { from: /slot="([^"]+)"/g, to: 'v-slot:$1' },
  { from: /slot-scope="([^"]+)"/g, to: 'v-slot="$1"' },
  
  // Vue 3 filters (need to be converted to methods or computed)
  { from: /\|\s*(\w+)/g, to: (match, filterName) => {
    console.log(`Warning: Filter "${filterName}" needs to be converted to a method or computed property`);
    return match;
  }},
  
  // Vue 3 v-model changes
  { from: /v-model="([^"]+)"\s+:value="([^"]+)"/g, to: 'v-model="$1"' },
  
  // Vue 3 lifecycle hooks
  { from: /beforeDestroy\s*\(/g, to: "beforeUnmount(" },
  { from: /destroyed\s*\(/g, to: "unmounted(" },
  
  // Vue Router changes
  { from: /this\.\$router\.currentRoute\b/g, to: "this.$router.currentRoute.value" },
  { from: /router\.currentRoute\b/g, to: "router.currentRoute.value" },
];

// Function to update a single file
function updateFile(filePath) {
  console.log(`Updating: ${filePath}`);
  
  let content = fs.readFileSync(filePath, 'utf8');
  let hasChanges = false;
  
  // Apply migration patterns
  migrationPatterns.forEach(pattern => {
    if (typeof pattern.to === 'string') {
      const newContent = content.replace(pattern.from, pattern.to);
      if (newContent !== content) {
        hasChanges = true;
        content = newContent;
      }
    } else if (typeof pattern.to === 'function') {
      content = content.replace(pattern.from, pattern.to);
    }
  });
  
  // Add getCurrentInstance import if using this.$root
  if (content.includes('this.$root') && !content.includes('getCurrentInstance')) {
    content = content.replace(
      /import\s+{([^}]+)}\s+from\s+['"]vue['"]/,
      "import { $1, getCurrentInstance } from 'vue'"
    );
    if (!content.includes("import { getCurrentInstance } from 'vue'")) {
      content = "import { getCurrentInstance } from 'vue'\n" + content;
    }
    hasChanges = true;
  }
  
  // Update global properties access
  if (content.includes('this.$') && !content.includes('globalProperties')) {
    // Add setup() if not exists
    if (!content.includes('setup()')) {
      const exportDefaultMatch = content.match(/export\s+default\s*{/);
      if (exportDefaultMatch) {
        const insertIndex = exportDefaultMatch.index + exportDefaultMatch[0].length;
        content = content.slice(0, insertIndex) + 
          "\n  setup() {\n    const instance = getCurrentInstance()\n    const globalProperties = instance?.appContext.config.globalProperties\n    \n    return {\n      globalProperties\n    }\n  }," + 
          content.slice(insertIndex);
        hasChanges = true;
      }
    }
  }
  
  if (hasChanges) {
    fs.writeFileSync(filePath, content);
    console.log(`✓ Updated: ${filePath}`);
  } else {
    console.log(`- No changes needed: ${filePath}`);
  }
}

// Main function
function main() {
  const viewPath = path.join(__dirname, 'src/view');
  const componentPath = path.join(__dirname, 'src/components');
  
  // Find all .vue files
  const vueFiles = [
    ...glob.sync(path.join(viewPath, '**/*.vue')),
    ...glob.sync(path.join(componentPath, '**/*.vue'))
  ];
  
  console.log(`Found ${vueFiles.length} Vue files to update\n`);
  
  // Update each file
  vueFiles.forEach(updateFile);
  
  console.log('\n✅ Migration script completed!');
  console.log('\n⚠️  Please review the following:');
  console.log('1. Filters need to be manually converted to methods or computed properties');
  console.log('2. Complex v-model usage may need manual adjustment');
  console.log('3. Test all components after migration');
  console.log('4. Run npm install to install new dependencies');
}

// Run the script
main();