import { NextRequest, NextResponse } from 'next/server';
import { Pool } from 'pg';
import cardsData from '../src/data/cards.json';

// Create PostgreSQL connection pool
const pool = new Pool({
  connectionString: process.env.DATABASE_URL,
  ssl: process.env.NODE_ENV === 'production' ? { rejectUnauthorized: false } : false,
});

interface JsonCard {
  id: number;
  name: string;
  set_name?: string;
  set_code?: string;
  card_number?: string;
  rarity?: string;
  game: string;
  mana_cost?: string;
  cmc?: number;
  card_type?: string;
  colors?: string[] | null;
  oracle_text?: string;
  flavor_text?: string | null;
  power?: string | null;
  toughness?: string | null;
  loyalty?: string | null;
  artist?: string | null;
  image_url?: string;
  stock_image_url?: string;
  artwork_crop_coords?: any;
  current_price?: number;
  market_price?: number;
  low_price?: number | null;
  high_price?: number | null;
  price_last_updated?: string | null;
  ocr_confidence?: number | null;
  ocr_raw_text?: string | null;
  scryfall_id?: string | null;
  tcg_player_id?: string | null;
  verified: number; // JSON has number, but we want boolean
  created_at?: string;
  updated_at?: string;
}

export default async function handler(req: NextRequest) {
  // Only allow POST requests for security
  if (req.method !== 'POST') {
    return new NextResponse(JSON.stringify({ error: 'Method not allowed' }), {
      status: 405,
      headers: { 'Content-Type': 'application/json' },
    });
  }

  const client = await pool.connect();
  
  try {
    console.log('Starting card migration to Neon database...');

    // Check if cards already exist to prevent duplicate migration
    const existingCards = await client.query('SELECT COUNT(*) as count FROM cards');
    const cardCount = existingCards.rows[0]?.count || 0;

    if (cardCount > 0) {
      return new NextResponse(JSON.stringify({ 
        message: `Database already contains ${cardCount} cards. Migration skipped.`,
        cards_count: cardCount
      }), {
        status: 200,
        headers: { 'Content-Type': 'application/json' },
      });
    }

    // Migrate cards from JSON
    const cards = cardsData as JsonCard[];
    console.log(`Migrating ${cards.length} cards...`);

    let migratedCount = 0;
    const errors: string[] = [];

    for (const card of cards) {
      try {
        await client.query(`
          INSERT INTO cards (
            name, set_name, set_code, card_number, rarity, game, mana_cost, cmc,
            card_type, colors, oracle_text, flavor_text, power, toughness, loyalty,
            artist, image_url, stock_image_url, artwork_crop_coords, current_price,
            market_price, low_price, high_price, price_last_updated, ocr_confidence,
            ocr_raw_text, scryfall_id, tcg_player_id, verified, created_at, updated_at
          ) VALUES (
            $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15,
            $16, $17, $18, $19, $20, $21, $22, $23, $24, $25, $26, $27, $28, $29, $30, $31
          )
        `, [
          card.name, 
          card.set_name || null, 
          card.set_code || null, 
          card.card_number || null, 
          card.rarity || null, 
          card.game, 
          card.mana_cost || null, 
          card.cmc || null, 
          card.card_type || null, 
          card.colors ? JSON.stringify(card.colors) : null, 
          card.oracle_text || null, 
          card.flavor_text || null, 
          card.power || null, 
          card.toughness || null, 
          card.loyalty || null,
          card.artist || null, 
          card.image_url || null, 
          card.stock_image_url || null, 
          card.artwork_crop_coords ? JSON.stringify(card.artwork_crop_coords) : null, 
          card.current_price || null,
          card.market_price || null, 
          card.low_price || null, 
          card.high_price || null,
          card.price_last_updated ? new Date(card.price_last_updated) : null,
          card.ocr_confidence || null, 
          card.ocr_raw_text || null, 
          card.scryfall_id || null,
          card.tcg_player_id || null, 
          Boolean(card.verified), 
          card.created_at ? new Date(card.created_at) : new Date(),
          card.updated_at ? new Date(card.updated_at) : new Date()
        ]);
        migratedCount++;
      } catch (error) {
        const errorMsg = `Error migrating card ${card.name}: ${(error as Error).message}`;
        console.error(errorMsg);
        errors.push(errorMsg);
      }
    }

    // Get final count to verify
    const finalCount = await client.query('SELECT COUNT(*) as count FROM cards');
    const finalCardCount = finalCount.rows[0]?.count || 0;

    console.log(`✅ Successfully migrated ${migratedCount} cards to Neon database!`);

    return new NextResponse(JSON.stringify({
      success: true,
      message: `Successfully migrated ${migratedCount} out of ${cards.length} cards`,
      cards_migrated: migratedCount,
      total_cards_in_db: finalCardCount,
      errors: errors.length > 0 ? errors : undefined
    }), {
      status: 200,
      headers: { 'Content-Type': 'application/json' },
    });

  } catch (error) {
    console.error('Migration failed:', error);
    return new NextResponse(JSON.stringify({ 
      success: false,
      error: 'Migration failed',
      details: (error as Error).message
    }), {
      status: 500,
      headers: { 'Content-Type': 'application/json' },
    });
  } finally {
    client.release();
  }
}