import type { FunnelPeriod } from '../../api/types';

/** Default period selected on first load: 单日(默认昨日,T+1)。 */
export const DEFAULT_PERIOD: FunnelPeriod = 'day';

/** The fixed 5-step funnel (display name + event key), in fixed order. */
export const FIXED_FUNNEL_STEPS: { name: string; event_key: string }[] = [
  { name: '启动', event_key: 'start' },
  { name: '曝光', event_key: 'show' },
  { name: '拼团详情', event_key: 'detail' },
  { name: '下单', event_key: 'order' },
  { name: '成功', event_key: 'paid' },
];

/** Format a "yyyyMMdd" snapshot day as "yyyy-MM-dd" for display. */
export function formatSnapshotDt(dt: string): string {
  if (/^\d{8}$/.test(dt)) {
    return `${dt.slice(0, 4)}-${dt.slice(4, 6)}-${dt.slice(6, 8)}`;
  }
  return dt;
}

/** Local-midnight `Date` for yesterday — the latest selectable / queryable day (data is T+1). */
export function yesterday(): Date {
  const d = new Date();
  d.setHours(0, 0, 0, 0);
  d.setDate(d.getDate() - 1);
  return d;
}

/** Format a local `Date` as request `snapshot_dt` ("yyyy-MM-dd"). */
export function toSnapshotParam(d: Date): string {
  const y = d.getFullYear();
  const m = String(d.getMonth() + 1).padStart(2, '0');
  const day = String(d.getDate()).padStart(2, '0');
  return `${y}-${m}-${day}`;
}