import type { RuntimeMode } from "../../shared/api";

import { createApiError, jsonResponse } from "../helpers";

const MAX_PAGE_SIZE = 200;

export function validateIdParam(idStr: string, mode: RuntimeMode): Response | { id: string } {
  if (!/^[a-zA-Z0-9][a-zA-Z0-9_-]*$/.test(idStr)) {
    return jsonResponse(createApiError("无效的 ID 参数", 400), { mode, status: 400 });
  }
  return { id: idStr };
}

export function validatePagination(
  pageParam: null | string,
  pageSizeParam: null | string,
  mode: RuntimeMode,
): Response | { page: number; pageSize: number } {
  let page = 1;
  let pageSize = 20;

  if (pageParam !== null) {
    page = Number(pageParam);
    if (!Number.isInteger(page) || page <= 0) {
      return jsonResponse(createApiError("无效的 page 参数", 400), { mode, status: 400 });
    }
  }

  if (pageSizeParam !== null) {
    pageSize = Number(pageSizeParam);
    if (!Number.isInteger(pageSize) || pageSize <= 0) {
      return jsonResponse(createApiError("无效的 pageSize 参数", 400), { mode, status: 400 });
    }
    if (pageSize > MAX_PAGE_SIZE) {
      return jsonResponse(createApiError(`pageSize 不能超过 ${MAX_PAGE_SIZE}`, 400), { mode, status: 400 });
    }
  }

  return { page, pageSize };
}

export function validateTimeRange(
  from: null | string,
  to: null | string,
  mode: RuntimeMode,
): Response | { from: string; to: string } {
  if (!from || !to) {
    return jsonResponse(createApiError("from 和 to 参数为必填项", 400), { mode, status: 400 });
  }

  const fromDate = new Date(from);
  const toDate = new Date(to);

  if (isNaN(fromDate.getTime()) || isNaN(toDate.getTime())) {
    return jsonResponse(createApiError("无效的 from 或 to 参数格式", 400), { mode, status: 400 });
  }

  if (fromDate.getTime() > toDate.getTime()) {
    return jsonResponse(createApiError("from 必须早于 to", 400), { mode, status: 400 });
  }

  return { from: fromDate.toISOString(), to: toDate.toISOString() };
}