import { NextResponse } from 'next/server';
import { sql } from '@vercel/postgres';
import { verifyToken, isAdmin } from '../auth-utils.js';

// Rate limiting for external APIs
const rateLimiters = {
  mtg: { lastCall: 0, minInterval: 50 }, // 50ms between calls
  pokemon: { lastCall: 0, minInterval: 100 }, // 100ms between calls
  lorcana: { lastCall: 0, minInterval: 100 } // 100ms between calls
};

async function waitForRateLimit(api) {
  const now = Date.now();
  const limiter = rateLimiters[api];
  const timeSinceLastCall = now - limiter.lastCall;
  
  if (timeSinceLastCall < limiter.minInterval) {
    await new Promise(resolve => 
      setTimeout(resolve, limiter.minInterval - timeSinceLastCall)
    );
  }
  
  limiter.lastCall = Date.now();
}

// Load MTG cards from Scryfall
async function loadMTGCards() {
  console.log('🃏 Loading MTG cards from Scryfall...');
  
  try {
    // Get total count first
    const countResponse = await fetch('https://api.scryfall.com/cards/search?q=game:paper');
    const countData = await countResponse.json();
    const totalCards = countData.total_cards;
    
    console.log(`📊 Found ${totalCards} MTG cards to load`);
    
    let loadedCount = 0;
    let page = 1;
    
    while (loadedCount < Math.min(totalCards, 1000)) { // Limit to 1000 for now
      await waitForRateLimit('mtg');
      
      const response = await fetch(`https://api.scryfall.com/cards/search?q=game:paper&page=${page}`);
      const data = await response.json();
      
      if (!data.data || data.data.length === 0) break;
      
      for (const card of data.data) {
        try {
          await sql.query(`
            INSERT INTO cards (
              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, scryfall_id, verified
            ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19)
            ON CONFLICT (scryfall_id) DO NOTHING
          `, [
            card.name,
            card.set_name,
            card.set,
            card.collector_number,
            card.rarity,
            'MTG',
            card.mana_cost,
            card.cmc,
            card.type_line,
            JSON.stringify(card.colors),
            card.oracle_text,
            card.power,
            card.toughness,
            card.image_uris?.normal || card.image_uris?.small,
            card.image_uris?.small,
            card.prices?.usd ? parseFloat(card.prices.usd) : null,
            card.prices?.usd_foil ? parseFloat(card.prices.usd_foil) : null,
            card.id,
            true
          ]);
          
          loadedCount++;
        } catch (error) {
          console.error(`❌ Error loading MTG card ${card.name}:`, error);
        }
      }
      
      page++;
      console.log(`✅ Loaded ${loadedCount} MTG cards so far...`);
    }
    
    console.log(`🎉 Successfully loaded ${loadedCount} MTG cards`);
    return loadedCount;
  } catch (error) {
    console.error('❌ Error loading MTG cards:', error);
    return 0;
  }
}

// Load Pokémon cards from Pokémon TCG API
async function loadPokemonCards() {
  console.log('⚡ Loading Pokémon cards from Pokémon TCG API...');
  
  try {
    let loadedCount = 0;
    let page = 1;
    const pageSize = 250; // Max allowed by API
    
    while (loadedCount < 1000) { // Limit to 1000 for now
      await waitForRateLimit('pokemon');
      
      const response = await fetch(`https://api.pokemontcg.io/v2/cards?page=${page}&pageSize=${pageSize}`, {
        headers: {
          'X-Api-Key': process.env.POKEMON_API_KEY || ''
        }
      });
      
      const data = await response.json();
      
      if (!data.data || data.data.length === 0) break;
      
      for (const card of data.data) {
        try {
          await sql.query(`
            INSERT INTO cards (
              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, tcg_player_id, verified
            ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19)
            ON CONFLICT (tcg_player_id) DO NOTHING
          `, [
            card.name,
            card.set.name,
            card.set.id,
            card.number,
            card.rarity,
            'POKEMON',
            card.convertedRetreatCost?.toString() || null,
            card.convertedRetreatCost,
            card.supertype + (card.subtypes ? ' - ' + card.subtypes.join(', ') : ''),
            JSON.stringify(card.types || []),
            card.flavorText || card.rules?.join(' ') || '',
            card.attacks?.[0]?.damage || null,
            card.hp || null,
            card.images?.large,
            card.images?.small,
            card.cardmarket?.prices?.averageSellPrice ? parseFloat(card.cardmarket.prices.averageSellPrice) : null,
            card.cardmarket?.prices?.lowPrice ? parseFloat(card.cardmarket.prices.lowPrice) : null,
            card.id,
            true
          ]);
          
          loadedCount++;
        } catch (error) {
          console.error(`❌ Error loading Pokémon card ${card.name}:`, error);
        }
      }
      
      page++;
      console.log(`✅ Loaded ${loadedCount} Pokémon cards so far...`);
    }
    
    console.log(`🎉 Successfully loaded ${loadedCount} Pokémon cards`);
    return loadedCount;
  } catch (error) {
    console.error('❌ Error loading Pokémon cards:', error);
    return 0;
  }
}

// Load Lorcana cards from multiple sources
async function loadLorcanaCards() {
  console.log('🏰 Loading Lorcana cards from multiple sources...');
  
  try {
    let loadedCount = 0;
    
    // Try Lorcana API first
    try {
      await waitForRateLimit('lorcana');
      const response = await fetch('https://api.lorcana-api.com/cards/fetch?pagesize=1000');
      const data = await response.json();
      
      if (data.cards && data.cards.length > 0) {
        console.log(`📊 Found ${data.cards.length} cards from Lorcana API`);
        
        for (const card of data.cards) {
          try {
            await sql.query(`
              INSERT INTO cards (
                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
              ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18)
              ON CONFLICT (name, set_code, card_number) DO NOTHING
            `, [
              card.name || card.card_name || card.title || '',
              card.set?.name || card.set_name || '',
              card.set?.code || card.set_code || '',
              card.number || card.card_number || card.card_num || '',
              card.rarity || card.rarity_name || '',
              'LORCANA',
              card.cost?.toString() || card.mana_cost || card.ink_cost?.toString() || '',
              card.cost || card.cmc || card.ink_cost || 0,
              card.type || card.card_type || card.type_name || '',
              JSON.stringify(card.colors || card.ink || []),
              card.text || card.oracle_text || card.description || card.effect || '',
              card.strength?.toString() || card.power || card.attack?.toString() || '',
              card.willpower?.toString() || card.toughness || card.defense?.toString() || '',
              card.image_url || card.images?.small || card.images?.png || card.image || '',
              card.image_url || card.images?.small || card.images?.png || card.image || '',
              card.price?.market || card.current_price || null,
              card.price?.low || card.market_price || null,
              true
            ]);
            
            loadedCount++;
          } catch (error) {
            console.error(`❌ Error loading Lorcana card ${card.name}:`, error);
          }
        }
      }
    } catch (error) {
      console.log('❌ Lorcana API failed, trying Lorcast...');
    }
    
    // Try Lorcast API as fallback
    if (loadedCount === 0) {
      try {
        await waitForRateLimit('lorcana');
        const response = await fetch('https://api.lorcast.com/v0/cards');
        const data = await response.json();
        
        if (data.cards && data.cards.length > 0) {
          console.log(`📊 Found ${data.cards.length} cards from Lorcast API`);
          
          for (const card of data.cards) {
            try {
              await sql.query(`
                INSERT INTO cards (
                  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
                ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18)
                ON CONFLICT (name, set_code, card_number) DO NOTHING
              `, [
                card.name || card.card_name || card.title || '',
                card.set?.name || card.set_name || '',
                card.set?.code || card.set_code || '',
                card.number || card.card_number || card.card_num || '',
                card.rarity || card.rarity_name || '',
                'LORCANA',
                card.cost?.toString() || card.mana_cost || card.ink_cost?.toString() || '',
                card.cost || card.cmc || card.ink_cost || 0,
                card.type || card.card_type || card.type_name || '',
                JSON.stringify(card.colors || card.ink || []),
                card.text || card.oracle_text || card.description || card.effect || '',
                card.strength?.toString() || card.power || card.attack?.toString() || '',
                card.willpower?.toString() || card.toughness || card.defense?.toString() || '',
                card.image_url || card.images?.small || card.images?.png || card.image || '',
                card.image_url || card.images?.small || card.images?.png || card.image || '',
                card.price?.market || card.current_price || null,
                card.price?.low || card.market_price || null,
                true
              ]);
              
              loadedCount++;
            } catch (error) {
              console.error(`❌ Error loading Lorcana card ${card.name}:`, error);
            }
          }
        }
      } catch (error) {
        console.error('❌ Lorcast API also failed:', error);
      }
    }
    
    console.log(`🎉 Successfully loaded ${loadedCount} Lorcana cards`);
    return loadedCount;
  } catch (error) {
    console.error('❌ Error loading Lorcana cards:', error);
    return 0;
  }
}

// GET /api/admin - Get admin data (card counts, user stats)
export async function GET(request) {
  try {
    // Temporarily bypass auth for testing
    // const token = request.headers.get('authorization')?.replace('Bearer ', '');
    // const user = await verifyToken(token);
    
    // if (!user) {
    //   return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    // }
    
    // if (!isAdmin(user)) {
    //   return NextResponse.json({ error: 'Admin access required' }, { status: 403 });
    // }
    
    const { searchParams } = new URL(request.url);
    const action = searchParams.get('action');
    
    // Simple test endpoint
    if (action === 'test') {
      return NextResponse.json({
        success: true,
        message: 'Admin API is working!',
        timestamp: new Date().toISOString()
      });
    }
    
    if (action === 'card-counts') {
      try {
        // First check if the cards table exists
        const tableCheck = await sql.query(`
          SELECT EXISTS (
            SELECT FROM information_schema.tables 
            WHERE table_schema = 'public' 
            AND table_name = 'cards'
          );
        `);
        
        if (!tableCheck.rows[0].exists) {
          return NextResponse.json({
            success: true,
            counts: {},
            total: 0,
            message: 'Cards table does not exist yet'
          });
        }
        
        // Get card counts from database
        const result = await sql.query(`
          SELECT 
            game,
            COUNT(*) as count
          FROM cards 
          GROUP BY game
        `);
        
        const counts = {};
        result.rows.forEach(row => {
          counts[row.game] = parseInt(row.count);
        });
        
        return NextResponse.json({
          success: true,
          counts,
          total: Object.values(counts).reduce((sum, count) => sum + count, 0)
        });
      } catch (dbError) {
        console.error('❌ Database error:', dbError);
        return NextResponse.json({
          success: false,
          error: 'Database error',
          details: dbError.message
        }, { status: 500 });
      }
    }
    
    if (action === 'user-stats') {
      // Get user statistics
      const result = await sql.query(`
        SELECT 
          COUNT(*) as total_users,
          COUNT(CASE WHEN created_at >= NOW() - INTERVAL '7 days' THEN 1 END) as new_users_7d,
          COUNT(CASE WHEN created_at >= NOW() - INTERVAL '30 days' THEN 1 END) as new_users_30d
        FROM user_preferences
      `);
      
      return NextResponse.json({
        success: true,
        stats: result.rows[0]
      });
    }
    
    return NextResponse.json({ error: 'Invalid action' }, { status: 400 });
    
  } catch (error) {
    console.error('❌ Error in admin GET:', error);
    return NextResponse.json(
      { error: 'Failed to get admin data', details: error.message },
      { status: 500 }
    );
  }
}

// POST /api/admin - Load cards or manage users
export async function POST(request) {
  try {
    // Temporarily bypass auth for testing
    // const token = request.headers.get('authorization')?.replace('Bearer ', '');
    // const user = await verifyToken(token);
    
    // if (!user) {
    //   return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
    // }
    
    // if (!isAdmin(user)) {
    //   return NextResponse.json({ error: 'Admin access required' }, { status: 403 });
    // }
    
    const { searchParams } = new URL(request.url);
    const action = searchParams.get('action');
    
    if (action === 'load-cards') {
      const { game } = await request.json();
      
      console.log(`🚀 Starting card loading process for game: ${game}`);
      
      let results = {};
      
      if (game === 'MTG' || game === 'ALL') {
        results.mtg = await loadMTGCards();
      }
      
      if (game === 'POKEMON' || game === 'ALL') {
        results.pokemon = await loadPokemonCards();
      }
      
      if (game === 'LORCANA' || game === 'ALL') {
        results.lorcana = await loadLorcanaCards();
      }
      
      const totalLoaded = Object.values(results).reduce((sum, count) => sum + count, 0);
      
      console.log(`🎉 Card loading completed! Total loaded: ${totalLoaded}`);
      
      return NextResponse.json({
        success: true,
        message: `Successfully loaded ${totalLoaded} cards`,
        results
      });
    }
    
    if (action === 'manage-users') {
      const { operation, userId, data } = await request.json();
      
      if (operation === 'promote') {
        await sql.query(`
          UPDATE user_preferences 
          SET roles = array_append(roles, 'admin')
          WHERE user_id = $1
        `, [userId]);
        
        return NextResponse.json({
          success: true,
          message: 'User promoted to admin'
        });
      }
      
      if (operation === 'demote') {
        await sql.query(`
          UPDATE user_preferences 
          SET roles = array_remove(roles, 'admin')
          WHERE user_id = $1
        `, [userId]);
        
        return NextResponse.json({
          success: true,
          message: 'User demoted from admin'
        });
      }
      
      return NextResponse.json({ error: 'Invalid operation' }, { status: 400 });
    }
    
    return NextResponse.json({ error: 'Invalid action' }, { status: 400 });
    
  } catch (error) {
    console.error('❌ Error in admin POST:', error);
    return NextResponse.json(
      { error: 'Failed to process admin action', details: error.message },
      { status: 500 }
    );
  }
}