import { sql } from '@vercel/postgres';
import { getUserFromRequest } from '../../lib/permission-middleware';

export default async function handler(req, res) {
  if (req.method !== 'GET') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  try {
    // Get authenticated user
    const user = await getUserFromRequest(req);
    if (!user) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    // Get user's decks from database
    const result = await sql`
      SELECT 
        d.*,
        COUNT(dc.card_id) as card_count,
        COALESCE(SUM(cards.market_price * dc.quantity), 0) as total_value
      FROM decks d
      LEFT JOIN deck_cards dc ON d.id = dc.deck_id
      LEFT JOIN cards ON dc.card_id = cards.id
      WHERE d.user_id = ${user.userId}
      GROUP BY d.id
      ORDER BY d.updated_at DESC
    `;

    const decks = result.rows.map(deck => ({
      id: deck.id,
      name: deck.name,
      description: deck.description,
      game: deck.game,
      cardCount: parseInt(deck.card_count) || 0,
      value: parseFloat(deck.total_value) || 0,
      createdAt: deck.created_at,
      updatedAt: deck.updated_at
    }));

    res.status(200).json(decks);
  } catch (error) {
    console.error('Error fetching decks:', error);
    res.status(500).json({ error: 'Failed to fetch decks' });
  }
}