import type { ScanPreset, ScanDateRange } from '../types/scan.js';

export function resolveScanDates(
  preset: ScanPreset,
  customStart?: string,
  customEnd?: string
): ScanDateRange {
  const now = new Date();

  switch (preset) {
    case 'today': {
      const midnight = new Date(now);
      midnight.setHours(0, 0, 0, 0);
      return { preset, startDate: midnight.toISOString(), endDate: now.toISOString() };
    }
    case 'last7days': {
      const sevenDaysAgo = new Date(now);
      sevenDaysAgo.setDate(sevenDaysAgo.getDate() - 7);
      sevenDaysAgo.setHours(0, 0, 0, 0);
      return { preset, startDate: sevenDaysAgo.toISOString(), endDate: now.toISOString() };
    }
    case 'custom': {
      if (!customStart || !customEnd) {
        throw new Error('Custom range requires startDate and endDate');
      }
      return {
        preset,
        startDate: new Date(customStart + 'T00:00:00').toISOString(),
        endDate: new Date(customEnd + 'T23:59:59').toISOString(),
      };
    }
  }
}