/**
 * Shared key format and coverage check for the per-group posterior draws
 * returned by `useDrawDistribution`. Both the hook (which builds the map) and
 * the charts (which read it, and decide whether to claim "real draws") go
 * through here so the key format lives in exactly one place.
 */

/** Canonical key for one race×sex group in a `drawsByGroup` map. */
export function groupKey(race, sex) {
  return `${race}_${sex}`
}

/**
 * True only when *every* group in `groups` has a non-empty draw array.
 *
 * `useDrawDistribution`'s `status` is an any-group signal: it reports 'ready'
 * as soon as one group has real draws. Charts fall back per-group, so the
 * chart-wide "these are real posterior draws" note/caption must be gated on
 * complete coverage instead — a group can be missing because its enrollment is
 * falsy or because its (LEAID, RACE, SEX) isn't in the parquet shard.
 *
 * Returns false for an empty group list (nothing rendered means nothing to
 * claim) and for a null map (loading, or the fetch failed outright).
 *
 * @param {Record<string, number[]> | null | undefined} drawsByGroup
 * @param {Array<{race: string, sex: string}>} groups - the groups a chart is
 *   actually rendering, not everything the API returned.
 * @returns {boolean}
 */
export function hasDrawsForAll(drawsByGroup, groups) {
  if (!drawsByGroup || !groups?.length) return false
  return groups.every((g) => (drawsByGroup[groupKey(g.race, g.sex)]?.length ?? 0) > 0)
}