const express = require('express');
const { requireAuth } = require('../middleware/auth');
const { createBet, createBetFromScreenshot, settleBet, listBets } = require('../services/betService');
const { extractFromScreenshot } = require('../services/ocrStub');
const { recalculatePerformance } = require('../services/performanceService');

const router = express.Router();

const VALID_BET_TYPES = new Set(['straight', 'parlay', 'teaser', 'round_robin']);
const VALID_SETTLE_STATUSES = new Set(['won', 'lost', 'push', 'void']);

function validateQuickslip(body) {
  if (!Array.isArray(body.legs) || body.legs.length === 0) return 'legs array is required';
  if (body.amount == null || body.amount <= 0) return 'amount is required and must be positive';
  if (!body.book) return 'book is required';
  if (!body.bet_type) return 'bet_type is required';
  if (!VALID_BET_TYPES.has(body.bet_type)) return `Invalid bet_type: ${body.bet_type}`;
  for (let i = 0; i < body.legs.length; i++) {
    const leg = body.legs[i];
    if (!leg.player) return `leg ${i}: player is required`;
    if (!leg.stat_type) return `leg ${i}: stat_type is required`;
    if (leg.line == null) return `leg ${i}: line is required`;
    if (!leg.direction) return `leg ${i}: direction is required`;
  }
  return null;
}

// POST /api/bets/quickslip
router.post('/quickslip', requireAuth, async (req, res) => {
  const error = validateQuickslip(req.body);
  if (error) return res.status(400).json({ error });

  try {
    const result = await createBet(req.user.id, req.body);
    return res.status(201).json(result);
  } catch (err) {
    if (err.statusCode === 404) return res.status(404).json({ error: err.message });
    console.error('[VYNDR] Quickslip error:', err.message);
    return res.status(503).json({ error: 'Bet submission failed' });
  }
});

// POST /api/bets/screenshot
router.post('/screenshot', requireAuth, async (req, res) => {
  // For MVP: accept the request but return stub extraction
  const book = req.body?.book || req.query?.book || 'unknown';

  // In a real implementation, we'd parse multipart form data and process the image
  // For MVP, just return the stub
  const extracted = extractFromScreenshot(book);

  return res.status(201).json({
    bet_id: null,
    status: 'pending_confirmation',
    extracted,
    needs_confirmation: true,
    message: extracted.message,
  });
});

// POST /api/bets/screenshot/confirm
router.post('/screenshot/confirm', requireAuth, async (req, res) => {
  const error = validateQuickslip(req.body);
  if (error) return res.status(400).json({ error });

  try {
    const result = await createBetFromScreenshot(req.user.id, req.body);
    return res.status(201).json(result);
  } catch (err) {
    if (err.statusCode === 404) return res.status(404).json({ error: err.message });
    console.error('[VYNDR] Screenshot confirm error:', err.message);
    return res.status(503).json({ error: 'Bet submission failed' });
  }
});

// POST /api/bets/sync
router.post('/sync', requireAuth, async (req, res) => {
  return res.json({
    status: 'coming_soon',
    message: 'Sportsbook sync is coming soon. Use quick slip or screenshot for now.',
    supported_books: ['draftkings', 'fanduel', 'betmgm', 'caesars', 'fanatics', 'bet365', 'hardrockbet', 'pointsbet', 'betrivers'],
  });
});

// PATCH /api/bets/:id/settle
router.patch('/:id/settle', requireAuth, async (req, res) => {
  const { status, leg_outcomes } = req.body;

  if (!status || !VALID_SETTLE_STATUSES.has(status)) {
    return res.status(400).json({ error: `Invalid status. Must be one of: ${[...VALID_SETTLE_STATUSES].join(', ')}` });
  }

  try {
    const result = await settleBet(req.user.id, req.params.id, { status, leg_outcomes });
    return res.json(result);
  } catch (err) {
    if (err.statusCode === 404) return res.status(404).json({ error: err.message });
    if (err.statusCode === 422) return res.status(422).json({ error: err.message });
    console.error('[VYNDR] Settle error:', err.message);
    return res.status(503).json({ error: 'Settlement failed' });
  }
});

// GET /api/bets
router.get('/', requireAuth, async (req, res) => {
  try {
    const result = await listBets(req.user.id, {
      status: req.query.status || null,
      book: req.query.book || null,
      limit: Math.min(parseInt(req.query.limit) || 20, 100),
      offset: parseInt(req.query.offset) || 0,
    });
    return res.json(result);
  } catch (err) {
    console.error('[VYNDR] List bets error:', err.message);
    return res.status(503).json({ error: 'Failed to fetch bets' });
  }
});

// GET /api/bets/performance
router.get('/performance', requireAuth, async (req, res) => {
  try {
    const result = await recalculatePerformance(req.user.id);
    return res.json(result);
  } catch (err) {
    console.error('[VYNDR] Performance error:', err.message);
    return res.status(503).json({ error: 'Failed to calculate performance' });
  }
});

module.exports = router;