import { fetchWecomConfig, fetchWecomJsSdkSignature } from "../api/auth";
import { isWecomWebView } from "./runtimeContext";

export type NativePreviewFile = {
  url: string;
  name: string | null | undefined;
  size: number | null | undefined;
};

let configuredSdkPromise: Promise<typeof import("@wecom/jssdk")> | null = null;

function currentPageUrl() {
  const url = new URL(window.location.href);
  url.hash = "";
  return url.href;
}

async function configuredWecomSdk() {
  if (!configuredSdkPromise) {
    configuredSdkPromise = Promise.all([import("@wecom/jssdk"), fetchWecomConfig()])
      .then(([ww, config]) => {
        if (!config.corpId) {
          throw new Error("企业微信文件预览未配置");
        }
        ww.register({
          corpId: config.corpId,
          jsApiList: ["previewFile"],
          async getConfigSignature(url) {
            const signed = await fetchWecomJsSdkSignature(url || currentPageUrl());
            return {
              timestamp: signed.timestamp,
              nonceStr: signed.nonceStr,
              signature: signed.signature,
            };
          },
        });
        return ww;
      })
      .catch((error) => {
        configuredSdkPromise = null;
        throw error;
      });
  }
  return configuredSdkPromise;
}

export async function previewFileInWecom(file: NativePreviewFile) {
  if (!isWecomWebView()) {
    return false;
  }
  const name = file.name?.trim();
  const size = Number(file.size);
  if (!name || !/\.[a-z0-9]{1,10}$/i.test(name) || !Number.isSafeInteger(size) || size <= 0) {
    throw new Error("文件信息不完整，暂时无法预览");
  }
  const ww = await configuredWecomSdk();
  await ww.previewFile({ url: file.url, name, size });
  return true;
}

export function openFileInBrowser(url: string) {
  window.open(url, "_blank", "noopener,noreferrer");
}