import { sql } from '../../../lib/sql.js';
import { getUserFromRequest } from '../../../lib/permission-middleware';
import { syncCatalogCard, ensureOwnedRow } from './index.js';

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

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

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

    if (req.method === 'GET') {
      return res.status(200).json({ design: existing });
    }

    if (req.method === 'PUT') {
      const f = pickFields(req.body);
      if (!f.name) {
        return res.status(400).json({ error: 'Name is required' });
      }

      const updated = await sql`
        UPDATE custom_cards SET
          name = ${f.name}, mana_cost = ${f.manaCost},
          card_type = ${f.cardType}, rarity = ${f.rarity},
          rules_text = ${f.rulesText}, actions = ${f.actions},
          power = ${f.power}, toughness = ${f.toughness},
          frame_id = ${f.frameId}, artwork_url = ${f.artworkUrl},
          updated_at = CURRENT_TIMESTAMP
        WHERE id = ${designId}
        RETURNING *
      `;
      const design = updated.rows[0];

      const cardId = await syncCatalogCard(design, f);
      if (cardId) {
        await ensureOwnedRow(user.userId, cardId);
        if (!design.card_id) {
          const linked = await sql`
            UPDATE custom_cards SET card_id = ${cardId}
            WHERE id = ${designId} RETURNING *
          `;
          return res.status(200).json({ design: linked.rows[0] });
        }
      }
      return res.status(200).json({ design });
    }

    if (req.method === 'DELETE') {
      // The catalog twin stays (it may already live in lists/decks);
      // removing the design row simply detaches future edits from it.
      await sql`DELETE FROM custom_cards WHERE id = ${designId}`;
      return res.status(200).json({ message: 'Design deleted' });
    }

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

function pickFields(body) {
  const str = (v) => (typeof v === 'string' ? v.trim() : null);
  return {
    name: str(body.name),
    manaCost: str(body.mana_cost) || str(body.manaCost),
    cardType: str(body.card_type) || str(body.cardType),
    rarity: str(body.rarity),
    rulesText: str(body.rules_text) || str(body.description),
    actions: str(body.actions),
    power: str(body.power),
    toughness: str(body.toughness),
    frameId: str(body.frame_id) || str(body.frameId) || 'classic',
    artworkUrl: str(body.artwork_url) || str(body.artworkUrl),
  };
}