type NotificationTarget = {
  targetType: string | null;
  targetId: string | null;
};

function encodeSegment(value: string) {
  return encodeURIComponent(value);
}

export function resolveNotificationTargetLink(item: NotificationTarget) {
  if (!item.targetType || !item.targetId) return null;

  if (item.targetType === "workflow_task") {
    return `/workflow/tasks/${item.targetId}`;
  }

  if (item.targetType === "reimbursement_form") {
    return `/reimbursements/${item.targetId}`;
  }

  if (item.targetType === "payment_batch") {
    return `/payment-batches?id=${encodeSegment(item.targetId)}`;
  }

  if (item.targetType === "leave_request") {
    return `/leave-requests?highlight=${item.targetId}`;
  }

  if (item.targetType === "attendance_correction") {
    return "/attendance";
  }

  if (item.targetType === "purchase_request") {
    return `/purchase-requests?highlight=${item.targetId}`;
  }

  if (item.targetType === "travel_request") {
    return `/travel-requests?highlight=${item.targetId}`;
  }

  if (item.targetType === "asset" || item.targetType === "asset_card") {
    return `/assets?highlight=${item.targetId}`;
  }

  if (item.targetType === "inventory_check") {
    return `/inventory-checks?highlight=${item.targetId}`;
  }

  if (item.targetType === "employee") {
    return "/settings/profile";
  }

  return null;
}

export function resolveMobileNotificationTargetLink(item: NotificationTarget) {
  if (!item.targetType || !item.targetId) return null;

  if (item.targetType === "workflow_task") {
    return `/mobile/approvals/${encodeSegment(item.targetId)}`;
  }

  if (item.targetType === "reimbursement_form") {
    return `/mobile/reimbursements/${encodeSegment(item.targetId)}`;
  }

  if (item.targetType === "payment_batch") {
    return `/mobile/payment-batches?id=${encodeSegment(item.targetId)}`;
  }

  if (item.targetType === "leave_request") {
    return `/mobile/leave/${encodeSegment(item.targetId)}`;
  }

  if (item.targetType === "attendance_correction") {
    return "/mobile/attendance";
  }

  if (item.targetType === "purchase_request") {
    return `/mobile/purchase-requests/${encodeSegment(item.targetId)}`;
  }

  if (item.targetType === "asset" || item.targetType === "asset_card" || item.targetType === "inventory_check") {
    return "/mobile/assets/scan";
  }

  if (item.targetType === "employee") {
    return "/mobile/profile";
  }

  return null;
}

export function formatNotificationRelativeTime(value: string | null) {
  if (!value) {
    return "-";
  }

  const timestamp = new Date(value).getTime();
  if (Number.isNaN(timestamp)) {
    return "-";
  }

  const diffMs = Date.now() - timestamp;
  if (diffMs < 60 * 1000) {
    return "刚刚";
  }

  const diffMinutes = Math.floor(diffMs / (60 * 1000));
  if (diffMinutes < 60) {
    return `${diffMinutes} 分钟前`;
  }

  const diffHours = Math.floor(diffMinutes / 60);
  if (diffHours < 24) {
    return `${diffHours} 小时前`;
  }

  const diffDays = Math.floor(diffHours / 24);
  if (diffDays < 7) {
    return `${diffDays} 天前`;
  }

  return new Date(value).toLocaleDateString("zh-CN");
}