// A staff-time report row opened here: whose schedule, and a view wide enough for the period.
const DAY = /^[0-9]{4}-[0-9]{2}-[0-9]{2}$/;

export interface ScheduleDrill { roleId?: string; from: string; range: 'day' | 'week' | 'month' | 'year' }

export const scheduleDrillFrom = (params: URLSearchParams): ScheduleDrill | null => {
    const from = params.get('start');
    const to = params.get('end');
    if (!from || !to || !DAY.test(from) || !DAY.test(to) || from > to) return null;
    const days = (Date.parse(to) - Date.parse(from)) / 86_400_000 + 1;
    const range = days <= 1 ? 'day' : days <= 7 ? 'week' : days <= 31 ? 'month' : 'year';
    const roleId = params.get('role');
    return { ...(roleId ? { roleId } : {}), from, range };
};