export type ReportStatusSummary = {
  status: string;
  approved: number;
  total: number;
};

const FAILED_REPORT_STATUSES = new Set(['failed', 'rejected']);

export function summarizeReportStatuses(statuses: string[]): ReportStatusSummary {
  if (!statuses.length) return { status: 'not_applicable', approved: 0, total: 0 };

  const approved = statuses.filter((status) => status === 'approved').length;
  const failed = statuses.filter((status) => FAILED_REPORT_STATUSES.has(status)).length;
  const abandoned = statuses.filter((status) => status === 'abandoned').length;

  if (approved === statuses.length) return { status: 'approved', approved, total: statuses.length };
  if (abandoned === statuses.length) return { status: 'abandoned', approved, total: statuses.length };

  // Overall failure means every current target failed. A single failed channel must not
  // erase successful channels or targets that can still finish reporting.
  if (failed === statuses.length) return { status: 'failed', approved, total: statuses.length };
  if (approved > 0) return { status: 'partial_success', approved, total: statuses.length };
  if (failed > 0) return { status: 'reporting', approved, total: statuses.length };
  if (statuses.some((status) => ['reporting', 'exporting', 'partial', 'partial_success'].includes(status))) {
    return { status: 'reporting', approved, total: statuses.length };
  }
  if (statuses.some((status) => status === 'waiting_material')) {
    return { status: 'waiting_material', approved, total: statuses.length };
  }
  return { status: 'pending', approved, total: statuses.length };
}