/**
 * /api/schedule/:sport (Session 23)
 *
 * Returns today's game schedule from cached/free ESPN data. NO odds-api
 * credits burned. The PM2 pollers warm this cache every 60s; on a miss
 * the schedule service self-heals by fetching the free ESPN scoreboard.
 *
 * Each game carries two boolean flags read from OTHER caches (no fetch):
 *   hasOdds      — odds-api player props exist for this slate
 *   hasGameLines — Tank01 game-level lines exist for this slate
 *
 * Response shape:
 * {
 *   sport: 'nba',
 *   date: '2026-06-12',
 *   games: [ { id, homeTeam, awayTeam, gameTime, status, score,
 *              venue, broadcast, hasOdds, hasGameLines } ],
 *   source: 'espn',
 * }
 */

const express = require('express');
const scheduleService = require('../services/scheduleService');
const { SPORT_CONFIG } = require('../config/sports');
const { createRateLimit } = require('../middleware/rateLimit');

const router = express.Router();
// Session 32 — public throttle (60/min; ESPN is free but be respectful).
router.use(createRateLimit({ windowMs: 60_000, max: 60 }));

const MISSION_HEADER = { 'X-VYNDR-Mission': 'The slate is never empty' };

// GET /api/schedule/:sport/pitchers (Session 46) — today's MLB probable starters
// (statsapi.mlb.com; the ESPN schedule above doesn't carry them). MLB only.
router.get('/:sport/pitchers', async (req, res) => {
  const sport = String(req.params.sport || '').toLowerCase();
  if (sport !== 'mlb') {
    return res.set(MISSION_HEADER).json({ sport, date: null, games: [] });
  }
  const date = req.query.date || scheduleService.todayET();
  try {
    const { getProbablePitchers } = require('../services/probablePitchers');
    const games = await getProbablePitchers(date);
    res.set('Cache-Control', 'public, max-age=300');
    return res.set(MISSION_HEADER).json({ sport, date, games });
  } catch (err) {
    console.error('[schedule/pitchers]', err.message);
    return res.set(MISSION_HEADER).json({ sport, date, games: [] });
  }
});

// Session 64 (A1-S5) — MLB lineup confirmation. { byPlayer, postedTeams };
// consumers resolve CONFIRMED / NOT_IN / PROJECTED via the posted-team rule.
router.get('/:sport/lineups', async (req, res) => {
  const sport = String(req.params.sport || '').toLowerCase();
  if (sport !== 'mlb') return res.set(MISSION_HEADER).json({ sport, byPlayer: {}, postedTeams: [] });
  const date = req.query.date || scheduleService.todayET();
  try {
    const { fetchLineups } = require('../services/lineupService');
    const parsed = await fetchLineups(date);
    res.set('Cache-Control', 'public, max-age=300');
    return res.set(MISSION_HEADER).json({ sport, date, ...parsed });
  } catch (err) {
    console.error('[schedule/lineups]', err.message);
    return res.set(MISSION_HEADER).json({ sport, date, byPlayer: {}, postedTeams: [] });
  }
});

// Session 64 (A1-S5) — the injury wire (ESPN feed): { byPlayer: { key:
// { status: OUT|GTD|PROB, detail, team } } }. Accurate chips, no cascades yet.
router.get('/:sport/injuries', async (req, res) => {
  const sport = String(req.params.sport || '').toLowerCase();
  try {
    const { fetchInjuries } = require('../services/injuryService');
    const byPlayer = await fetchInjuries(sport);
    res.set('Cache-Control', 'public, max-age=600');
    return res.set(MISSION_HEADER).json({ sport, byPlayer });
  } catch (err) {
    console.error('[schedule/injuries]', err.message);
    return res.set(MISSION_HEADER).json({ sport, byPlayer: {} });
  }
});

router.get('/:sport', async (req, res) => {
  const sport = String(req.params.sport || '').toLowerCase();
  const date = req.query.date || scheduleService.todayET();

  if (!SPORT_CONFIG[sport]) {
    return res.status(404).set(MISSION_HEADER).json({ error: `Unknown sport: ${sport}` });
  }

  try {
    const raw = await scheduleService.getSchedule(sport, date);
    // null → unsupported sport (already guarded above); treat defensively.
    const games = await scheduleService.enrichFlags(sport, date, raw || []);
    return res.set(MISSION_HEADER).json({
      sport,
      date,
      games,
      source: 'espn',
    });
  } catch (err) {
    console.error(`[schedule/${sport}]`, err.message);
    // Even on error we return an empty slate, not a 5xx — the platform
    // is NEVER down. Other layers (game lines, props) keep it alive.
    return res.set(MISSION_HEADER).json({ sport, date, games: [], source: 'espn' });
  }
});

module.exports = router;