import { sql } from '@vercel/postgres';
import { verifyToken } from '../auth-utils.js';

// GET /api/cards - Search cards from database
export default async function handler(req, res) {
  // Set CORS headers
  res.setHeader('Access-Control-Allow-Origin', '*');
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, OPTIONS');
  res.setHeader('Access-Control-Allow-Headers', 'Content-Type, Authorization');

  // Handle preflight requests
  if (req.method === 'OPTIONS') {
    res.status(200).end();
    return;
  }

  if (req.method !== 'GET' && req.method !== 'POST') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  try {
    const { q, search, game, page = '1', limit = '20' } = req.query;
    const query = q || search || '';
    const pageNum = parseInt(page);
    const limitNum = parseInt(limit);
    const offset = (pageNum - 1) * limitNum;
    
    console.log(`🔍 Searching cards: "${query}" game: "${game}" page: ${pageNum}`);
    
    // Build the SQL query
    let sqlQuery = `
      SELECT 
        id,
        name,
        set_name,
        set_code,
        card_number,
        rarity,
        game,
        mana_cost,
        cmc,
        card_type,
        colors,
        oracle_text,
        power,
        toughness,
        image_url,
        stock_image_url,
        current_price,
        market_price,
        verified,
        created_at,
        updated_at
      FROM cards
      WHERE 1=1
    `;
    
    const params = [];
    let paramIndex = 1;
    
    // Add search filter
    if (query.trim()) {
      sqlQuery += ` AND (
        name ILIKE $${paramIndex} OR 
        oracle_text ILIKE $${paramIndex} OR
        card_type ILIKE $${paramIndex} OR
        set_name ILIKE $${paramIndex}
      )`;
      params.push(`%${query}%`);
      paramIndex++;
    }
    
    // Add game filter
    if (game && game !== 'ALL') {
      sqlQuery += ` AND game = $${paramIndex}`;
      params.push(game);
      paramIndex++;
    }
    
    // Add ordering and pagination
    sqlQuery += ` ORDER BY name ASC LIMIT $${paramIndex} OFFSET $${paramIndex + 1}`;
    params.push(limitNum, offset);
    
    console.log(`📝 SQL Query: ${sqlQuery}`);
    console.log(`📝 Parameters:`, params);
    
    // Execute the query
    const result = await sql.query(sqlQuery, params);
    
    // Get total count for pagination
    let countQuery = `
      SELECT COUNT(*) as total
      FROM cards
      WHERE 1=1
    `;
    
    const countParams = [];
    let countParamIndex = 1;
    
    if (query.trim()) {
      countQuery += ` AND (
        name ILIKE $${countParamIndex} OR 
        oracle_text ILIKE $${countParamIndex} OR
        card_type ILIKE $${countParamIndex} OR
        set_name ILIKE $${countParamIndex}
      )`;
      countParams.push(`%${query}%`);
      countParamIndex++;
    }
    
    if (game && game !== 'ALL') {
      countQuery += ` AND game = $${countParamIndex}`;
      countParams.push(game);
      countParamIndex++;
    }
    
    const countResult = await sql.query(countQuery, countParams);
    const total = parseInt(countResult.rows[0].total);
    
    // Format the response
    const cards = result.rows.map(card => ({
      id: card.id,
      name: card.name,
      setName: card.set_name,
      setCode: card.set_code,
      cardNumber: card.card_number,
      rarity: card.rarity,
      game: card.game,
      manaCost: card.mana_cost,
      cmc: card.cmc,
      cardType: card.card_type,
      colors: card.colors ? JSON.parse(card.colors) : [],
      oracleText: card.oracle_text,
      power: card.power,
      toughness: card.toughness,
      imageUrl: card.image_url,
      stockImageUrl: card.stock_image_url,
      currentPrice: card.current_price,
      marketPrice: card.market_price,
      verified: card.verified,
      createdAt: card.created_at,
      updatedAt: card.updated_at
    }));
    
    return res.status(200).json({
      success: true,
      cards,
      pagination: {
        page: pageNum,
        limit: limitNum,
        total,
        pages: Math.ceil(total / limitNum)
      }
    });
    
  } catch (error) {
    console.error('❌ Error in cards API:', error);
    return res.status(500).json({
      error: 'Failed to search cards',
      details: error.message
    });
  }
}