#!/usr/bin/env node

import dotenv from 'dotenv';
import { neon } from '@neondatabase/serverless';

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

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

  try {
    console.log('🔧 Fixing user_cards table constraints...');

    // First, check if there are any duplicate entries that would prevent adding the constraint
    console.log('🔍 Checking for duplicate entries...');
    const duplicates = await sql`
      SELECT user_id, card_id, COUNT(*) as count
      FROM user_cards
      GROUP BY user_id, card_id
      HAVING COUNT(*) > 1
    `;

    if (duplicates.length > 0) {
      console.log(`⚠️  Found ${duplicates.length} duplicate entries. Cleaning up...`);
      
      // Remove duplicates by keeping the latest entry for each user/card combination
      for (const dup of duplicates) {
        console.log(`Cleaning duplicates for user ${dup.user_id}, card ${dup.card_id}...`);
        
        // Keep only the most recent entry
        await sql`
          DELETE FROM user_cards 
          WHERE user_id = ${dup.user_id} AND card_id = ${dup.card_id}
          AND id NOT IN (
            SELECT id FROM user_cards 
            WHERE user_id = ${dup.user_id} AND card_id = ${dup.card_id}
            ORDER BY updated_at DESC, id DESC 
            LIMIT 1
          )
        `;
      }
      console.log('✅ Cleaned up duplicate entries');
    } else {
      console.log('✅ No duplicate entries found');
    }

    // Add the unique constraint to user_cards
    console.log('🔒 Adding unique constraint on user_cards (user_id, card_id)...');
    try {
      await sql`
        ALTER TABLE user_cards 
        ADD CONSTRAINT user_cards_user_card_unique 
        UNIQUE (user_id, card_id)
      `;
      console.log('✅ Added user_cards unique constraint');
    } catch (error) {
      if (error.message.includes('already exists')) {
        console.log('✅ User_cards unique constraint already exists');
      } else {
        throw error;
      }
    }

    // Add the unique constraint to collection_cards
    console.log('🔒 Adding unique constraint on collection_cards (collection_id, card_id)...');
    try {
      await sql`
        ALTER TABLE collection_cards 
        ADD CONSTRAINT collection_cards_collection_card_unique 
        UNIQUE (collection_id, card_id)
      `;
      console.log('✅ Added collection_cards unique constraint');
    } catch (error) {
      if (error.message.includes('already exists')) {
        console.log('✅ Collection_cards unique constraint already exists');
      } else {
        throw error;
      }
    }

    // Now sync existing owned cards to "All My Cards" collections
    console.log('🔄 Syncing owned cards to "All My Cards" collections...');
    
    // Get all users with owned cards
    const usersWithOwnedCards = await sql`
      SELECT DISTINCT uc.user_id, u.email
      FROM user_cards uc
      JOIN users u ON uc.user_id = u.id
      WHERE uc.quantity > 0
    `;

    console.log(`Found ${usersWithOwnedCards.length} users with owned cards`);

    for (const user of usersWithOwnedCards) {
      try {
        // Find the user's "All My Cards" collection
        const allMyCardsCollection = await sql`
          SELECT id FROM collections 
          WHERE user_id = ${user.user_id} 
          AND name = 'All My Cards' 
          AND is_system_collection = true
        `;

        if (allMyCardsCollection.length === 0) {
          console.log(`⚠️  No "All My Cards" collection found for ${user.email}`);
          continue;
        }

        const collectionId = allMyCardsCollection[0].id;

        // Get all owned cards for this user
        const ownedCards = await sql`
          SELECT card_id, quantity 
          FROM user_cards 
          WHERE user_id = ${user.user_id} AND quantity > 0
        `;

        console.log(`Syncing ${ownedCards.length} owned cards for ${user.email}...`);

        // Add each owned card to the "All My Cards" collection
        for (const ownedCard of ownedCards) {
          // Check if card is already in the collection
          const existingEntry = await sql`
            SELECT id, quantity FROM collection_cards 
            WHERE collection_id = ${collectionId} AND card_id = ${ownedCard.card_id}
          `;

          if (existingEntry.length > 0) {
            // Update existing entry
            await sql`
              UPDATE collection_cards 
              SET quantity = ${ownedCard.quantity}
              WHERE collection_id = ${collectionId} AND card_id = ${ownedCard.card_id}
            `;
          } else {
            // Insert new entry
            await sql`
              INSERT INTO collection_cards (collection_id, card_id, quantity, created_at)
              VALUES (${collectionId}, ${ownedCard.card_id}, ${ownedCard.quantity}, CURRENT_TIMESTAMP)
            `;
          }
        }

        console.log(`  ✅ Synced ${ownedCards.length} cards for ${user.email}`);

      } catch (error) {
        console.error(`  ❌ Failed to sync cards for ${user.email}:`, error.message);
      }
    }

    console.log('\n🎉 Migration completed successfully!');
    console.log('\n📋 Summary:');
    console.log(`   • Fixed unique constraint on user_cards table`);
    console.log(`   • Synced owned cards to "All My Cards" collections`);
    console.log(`   • Card ownership API should now work properly`);

  } catch (error) {
    console.error('❌ Migration failed:', error.message);
    console.error('Full error:', error);
    process.exit(1);
  }
}

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

export { fixUserCardsConstraints };