import { sql } from '../../../lib/sql.js';
import { getUserFromRequest } from '../../../lib/permission-middleware';

export default async function handler(req, res) {
  try {
    const user = await getUserFromRequest(req);
    if (!user) {
      return res.status(401).json({ error: 'Authentication required' });
    }

    const gameId = parseInt(req.query.id, 10);
    if (!Number.isInteger(gameId)) {
      return res.status(400).json({ error: 'Invalid game id' });
    }

    const found = await sql`
      SELECT * FROM custom_games
      WHERE id = ${gameId} AND user_id = ${user.userId}
    `;
    if (found.rows.length === 0) {
      return res.status(404).json({ error: 'Game not found' });
    }
    const game = found.rows[0];

    if (req.method === 'GET') {
      const cards = await sql`
        SELECT id, card_id, name, mana_cost, card_type, rarity,
               rules_text, actions, flavor_quote, power, toughness,
               frame_id, artwork_url, art_mode, created_at, updated_at
        FROM custom_cards
        WHERE custom_game_id = ${gameId}
        ORDER BY updated_at DESC
      `;
      return res.status(200).json({ game, designs: cards.rows });
    }

    if (req.method === 'PUT') {
      const name = typeof req.body?.name === 'string' ? req.body.name.trim() : '';
      const description =
        typeof req.body?.description === 'string' ? req.body.description.trim() : null;

      if (!name) {
        return res.status(400).json({ error: 'Game name is required' });
      }

      const clash = await sql`
        SELECT id FROM custom_games
        WHERE user_id = ${user.userId}
          AND lower(name) = ${name.toLowerCase()}
          AND id <> ${gameId}
      `;
      if (clash.rows.length > 0) {
        return res.status(409).json({ error: 'You already have a game with that name' });
      }

      const updated = await sql`
        UPDATE custom_games SET
          name = ${name}, description = ${description},
          updated_at = CURRENT_TIMESTAMP
        WHERE id = ${gameId}
        RETURNING *
      `;
      return res.status(200).json({ game: updated.rows[0] });
    }

    if (req.method === 'DELETE') {
      // Designs keep existing (custom_game_id drops to NULL via FK);
      // their catalog twins stay in the collection untouched.
      await sql`DELETE FROM custom_games WHERE id = ${gameId}`;
      return res.status(200).json({ message: 'Game deleted' });
    }

    return res.status(405).json({ error: 'Method not allowed' });
  } catch (error) {
    console.error('Custom game API error:', error);
    return res.status(500).json({ error: 'Internal server error' });
  }
}