#!/usr/bin/env node

import dotenv from 'dotenv';
import { neon } from '@neondatabase/serverless';
import { generateUniqueSlug } from '../lib/slug-utils.js';

dotenv.config({ path: '.env.local' });

async function addCollectionSlugs() {
  const sql = neon(process.env.POSTGRES_URL);

  try {
    console.log('🔗 Adding slug support to collections...');

    // Step 1: Add slug column to collections table
    console.log('📝 Adding slug column...');
    await sql`
      ALTER TABLE collections 
      ADD COLUMN IF NOT EXISTS slug VARCHAR(100) UNIQUE
    `;
    console.log('✅ Added slug column');

    // Step 2: Get all existing collections
    console.log('🔍 Fetching existing collections...');
    const collections = await sql`
      SELECT id, name, slug FROM collections 
      ORDER BY created_at ASC
    `;
    console.log(`📊 Found ${collections.length} collections`);

    if (collections.length === 0) {
      console.log('✅ No collections to migrate');
      return;
    }

    // Step 3: Generate unique slugs for all collections
    console.log('🏷️ Generating unique slugs...');
    const existingSlugs = [];
    const updates = [];

    for (const collection of collections) {
      // Skip if collection already has a slug
      if (collection.slug) {
        existingSlugs.push(collection.slug);
        console.log(`⏭️  Skipping "${collection.name}" - already has slug: ${collection.slug}`);
        continue;
      }

      // Generate unique slug
      const uniqueSlug = await generateUniqueSlug(collection.name, existingSlugs);
      existingSlugs.push(uniqueSlug);
      
      updates.push({
        id: collection.id,
        name: collection.name,
        slug: uniqueSlug
      });

      console.log(`🎯 "${collection.name}" → "${uniqueSlug}"`);
    }

    // Step 4: Update collections with their new slugs
    if (updates.length > 0) {
      console.log(`📝 Updating ${updates.length} collections with slugs...`);
      
      for (const update of updates) {
        await sql`
          UPDATE collections 
          SET slug = ${update.slug}
          WHERE id = ${update.id}
        `;
        console.log(`✅ Updated: ${update.name} → ${update.slug}`);
      }
    }

    // Step 5: Add index for performance
    console.log('🚀 Adding slug index for performance...');
    try {
      await sql`CREATE UNIQUE INDEX IF NOT EXISTS idx_collections_slug ON collections(slug)`;
      console.log('✅ Added slug index');
    } catch (error) {
      if (!error.message.includes('already exists')) {
        throw error;
      }
      console.log('✅ Slug index already exists');
    }

    // Step 6: Add constraint to ensure slugs are not null for new collections
    console.log('🔒 Adding slug constraints...');
    try {
      await sql`ALTER TABLE collections ADD CONSTRAINT check_slug_format CHECK (slug ~ '^[a-z0-9]([a-z0-9-]*[a-z0-9])?$' AND length(slug) <= 50)`;
      console.log('✅ Added slug format constraint');
    } catch (error) {
      if (!error.message.includes('already exists')) {
        console.warn('⚠️  Could not add slug constraint:', error.message);
      } else {
        console.log('✅ Slug constraint already exists');
      }
    }

    console.log('\n🎉 Collection slug migration completed successfully!');
    console.log('\n📋 Summary:');
    console.log(`   📊 Total collections: ${collections.length}`);
    console.log(`   🆕 New slugs created: ${updates.length}`);
    console.log(`   ⏭️  Already had slugs: ${collections.length - updates.length}`);
    
    if (updates.length > 0) {
      console.log('\n🔗 New URL structure:');
      console.log('   Old: /collection/123');
      console.log('   New: /collection/modern-masters-2021');
    }

  } catch (error) {
    console.error('❌ Failed to add collection slugs:', error.message);
    console.error('Full error:', error);
    process.exit(1);
  }
}

if (import.meta.url === `file://${process.argv[1]}`) {
  addCollectionSlugs();
}

export { addCollectionSlugs };