'use strict';

/**
 * Stat-filter categories per sport (Session 23).
 *
 * The stat filter is VYNDR's navigation system — users browse by what
 * they care about ("show me everyone on a 3-point streak"), not by sport
 * alone. These categories drive:
 *   - the StatFilterPills UI
 *   - the `?stat=` param on /api/streaks and /api/hotlist
 *
 * Category strings here MUST match the `category` field the streaks &
 * hot-list engines emit, or the filter silently returns nothing. Mirror
 * any change in `web/src/config/statFilters.ts`.
 */

const STAT_FILTERS = Object.freeze({
  nba:    ['all', 'points', 'rebounds', 'assists', 'threes', 'blocks', 'steals', 'pra'],
  wnba:   ['all', 'points', 'rebounds', 'assists', 'threes', 'blocks', 'steals'],
  mlb:    ['all', 'hits', 'home_runs', 'stolen_bases', 'rbis', 'strikeouts', 'total_bases', 'on_base'],
  soccer: ['all', 'goals', 'assists', 'shots', 'tackles', 'saves'],
  nfl:    ['all', 'passing_yards', 'rushing_yards', 'receiving_yards', 'touchdowns', 'interceptions'],
});

function getStatFilters(sport) {
  return STAT_FILTERS[String(sport || '').toLowerCase()] || ['all'];
}

/** Is `stat` a valid category for `sport`? 'all' is always valid. */
function isValidStat(sport, stat) {
  if (!stat || stat === 'all') return true;
  return getStatFilters(sport).includes(String(stat).toLowerCase());
}

module.exports = { STAT_FILTERS, getStatFilters, isValidStat };
