import { getUserFromRequest } from '../../../lib/permission-middleware';
import { checkScanRateLimit } from '../../../lib/rate-limit.js';
import { analyzeCardImage } from '../../../lib/scan-vision.js';
import { submitScanForReview, logScanAttempt } from '../../../lib/card-catalog-match.js';

export default async function handler(req, res) {
  if (req.method !== 'POST') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  const startedAt = Date.now();

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

    const { allowed, reset } = await checkScanRateLimit(req, user.userId);
    if (!allowed) {
      res.setHeader('Retry-After', Math.ceil((reset - Date.now()) / 1000));
      return res.status(429).json({ error: 'Too many attempts. Try again later.' });
    }

    const {
      imageData,
      name,
      game,
      candidateCardIds = [],
    } = req.body || {};

    let fields = {
      name: typeof name === 'string' ? name.trim() : null,
      game: game || null,
      ocrData: {
        confidence: 65,
        rawText: name || null,
      },
    };

    if (imageData && typeof imageData === 'string' && imageData.length <= 6_000_000) {
      try {
        const ocrResult = await analyzeCardImage(imageData);
        if (ocrResult.isCard || ocrResult.cardName) {
          fields = {
            name: ocrResult.cardName || fields.name,
            set: ocrResult.setName || null,
            setCode: ocrResult.setCode || null,
            cardNumber: ocrResult.cardNumber || null,
            game: game || ocrResult.game || null,
            cardType: ocrResult.cardType || null,
            rarity: ocrResult.rarity || null,
            hp: ocrResult.hp || null,
            manaCost: ocrResult.manaCost || null,
            ocrData: {
              confidence: ocrResult.confidence || 65,
              rawText: ocrResult.rawText || name || null,
              abilities: ocrResult.abilities || [],
            },
          };
        }
      } catch (visionError) {
        console.warn('[submit-for-review] Vision failed, using name hint:', visionError.message);
      }
    }

    if (!fields.name) {
      return res.status(400).json({ error: 'Card name is required to submit for review' });
    }

    const candidateIds = Array.isArray(candidateCardIds)
      ? candidateCardIds.filter((id) => Number.isInteger(id) || (typeof id === 'string' && id !== ''))
      : [];

    const matchResult = await submitScanForReview(user.userId, fields, candidateIds);

    await logScanAttempt({
      userId: user.userId,
      ocrText: fields.ocrData?.rawText,
      ocrConfidence: fields.ocrData?.confidence,
      layer: 2,
      resultKind: 'submitted',
      latencyMs: Date.now() - startedAt,
    });

    return res.status(200).json({
      needsReview: true,
      submissionId: matchResult.submissionId,
      message: matchResult.message,
    });
  } catch (error) {
    console.error('[POST /api/scan/submit-for-review]', error);
    return res.status(500).json({ error: 'Internal server error' });
  }
}