import { NextRequest, NextResponse } from 'next/server';
import { neon } from '@neondatabase/serverless';
import cardsData from '../src/data/cards.json';

// Initialize Neon client
const sql = neon(process.env.DATABASE_URL!);

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' },
    });
  }

  try {
    console.log('Starting card migration to Neon database...');

    // Check if cards already exist to prevent duplicate migration
    const existingCards = await sql`SELECT COUNT(*) as count FROM cards`;
    const cardCount = existingCards[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 sql`
          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 (
            ${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.message}`;
        console.error(errorMsg);
        errors.push(errorMsg);
      }
    }

    // Get final count to verify
    const finalCount = await sql`SELECT COUNT(*) as count FROM cards`;
    const finalCardCount = finalCount[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.message
    }), {
      status: 500,
      headers: { 'Content-Type': 'application/json' },
    });
  }
}