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/** 东八区日历日 YYYY-MM-DD（与后端活动状态一致，勿对 ISO 直接 slice(0,10)） */
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export function ymdInShanghai(iso?: string | null): string {
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if (!iso) return ''
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const d = new Date(String(iso))
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if (Number.isNaN(d.getTime())) return String(iso).slice(0, 10)
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return new Intl.DateTimeFormat('en-CA', {
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timeZone: 'Asia/Shanghai',
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year: 'numeric',
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month: '2-digit',
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day: '2-digit',
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}).format(d)
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}
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function todayYmdShanghai(): string {
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return new Intl.DateTimeFormat('en-CA', {
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timeZone: 'Asia/Shanghai',
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year: 'numeric',
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month: '2-digit',
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day: '2-digit',
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}).format(new Date())
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}
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function compareYmd(a: string, b: string): number {
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if (!a || !b) return 0
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if (a < b) return -1
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if (a > b) return 1
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return 0
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}
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/** 与后台活动列表一致：未开始 / 进行中 / 已结束 */
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export type ActivityScheduleStatus = 'not_started' | 'ongoing' | 'ended'
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export function computeActivityScheduleStatus(
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startAt?: string | null,
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endAt?: string | null,
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): ActivityScheduleStatus {
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const today = todayYmdShanghai()
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const startD = ymdInShanghai(startAt)
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const endD = ymdInShanghai(endAt)
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if (!startD && !endD) return 'ongoing'
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if (startD && !endD) {
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return compareYmd(today, startD) < 0 ? 'not_started' : 'ongoing'
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}
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if (!startD && endD) {
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return compareYmd(today, endD) > 0 ? 'ended' : 'ongoing'
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}
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if (compareYmd(today, startD) < 0) return 'not_started'
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if (compareYmd(today, endD) > 0) return 'ended'
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return 'ongoing'
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}
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export function activityScheduleStatusLabel(s: ActivityScheduleStatus): string {
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if (s === 'not_started') return '未开始'
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if (s === 'ended') return '已结束'
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return '进行中'
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}
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/** 活动是否已按「日历日」结束：结束日期早于今天则视为不可报名 */
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export function isActivityEndedByCalendar(endAt?: string | null): boolean {
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if (!endAt) return false
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const endDay = ymdInShanghai(endAt)
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if (!endDay) return false
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const todayStr = todayYmdShanghai()
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return endDay < todayStr
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}
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/** 活动日期：同年为「2026年4月1日至5月3日」，跨年则两年份都写 */
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export function formatActivityCnRange(startAt?: string | null, endAt?: string | null) {
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const parse = (raw?: string | null) => {
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if (!raw) return null
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const s = String(raw).trim()
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if (/^\d{4}-\d{2}-\d{2}$/.test(s)) {
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const p = s.split('-').map(Number)
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if (p.length !== 3) return null
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const [y, m, d] = p
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if (!Number.isFinite(y) || !Number.isFinite(m) || !Number.isFinite(d)) return null
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return { y, m, d }
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}
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const ymd = ymdInShanghai(s)
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if (!ymd) return null
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const p = ymd.split('-').map(Number)
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if (p.length !== 3) return null
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const [y, m, d] = p
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if (!Number.isFinite(y) || !Number.isFinite(m) || !Number.isFinite(d)) return null
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return { y, m, d }
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}
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const s = parse(startAt)
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const e = parse(endAt)
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if (!s && !e) return '日期待定'
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if (s && !e) return `${s.y}年${s.m}月${s.d}日`
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if (!s && e) return `${e.y}年${e.m}月${e.d}日`
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if (s && e) {
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if (s.y === e.y && s.m === e.m && s.d === e.d) {
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return `${s.y}年${s.m}月${s.d}日`
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}
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if (s.y === e.y) {
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return `${s.y}年${s.m}月${s.d}日至${e.m}月${e.d}日`
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}
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return `${s.y}年${s.m}月${s.d}日至${e.y}年${e.m}月${e.d}日`
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}
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return '日期待定'
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}
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