/*
 * @author: MCBBC
 * @date: 2023-07-17
 * @customEditors: imsyy
 * @lastEditTime: 2023-07-17
 */

const Router = require("koa-router");
const kuaishouRouter = new Router();
const axios = require("axios");
const { get, set, del } = require("../utils/cacheData");

// 接口信息
const routerInfo = {
  name: "kuaishou",
  title: "快手",
  subtitle: "热榜",
};

// 缓存键名
const cacheKey = "kuaishouData";

// 调用时间
let updateTime = new Date().toISOString();

// 调用路径
const url = "https://www.kuaishou.com/?isHome=1";

// Unicode 解码
const decodedString = (encodedString) => {
  return encodedString.replace(/\\u([\d\w]{4})/gi, (match, grp) =>
    String.fromCharCode(parseInt(grp, 16))
  );
};

// 数据处理
const getData = (data) => {
  if (!data) return [];
  const dataList = [];
  try {
    const pattern = /window.__APOLLO_STATE__=(.*);\(function\(\)/s;
    const idPattern = /clientCacheKey=([A-Za-z0-9]+)/s;
    const matchResult = data.match(pattern);
    const jsonObject = JSON.parse(matchResult[1])["defaultClient"];

    // 获取所有分类
    const allItems =
      jsonObject['$ROOT_QUERY.visionHotRank({"page":"home"})']["items"];
    // 遍历所有分类
    allItems.forEach((v) => {
      // 基础数据
      const image = jsonObject[v.id]["poster"];
      const id = image.match(idPattern)[1];
      // 数据处理
      dataList.push({
        title: jsonObject[v.id]["name"],
        pic: decodedString(image),
        hot: jsonObject[v.id]["hotValue"],
        url: `https://www.kuaishou.com/short-video/${id}`,
        mobileUrl: `https://www.kuaishou.com/short-video/${id}`,
      });
    });
    return dataList;
  } catch (error) {
    console.error("数据处理出错" + error);
    return false;
  }
};

// 快手热榜
kuaishouRouter.get("/kuaishou", async (ctx) => {
  console.log("获取快手热榜");
  try {
    // 从缓存中获取数据
    let data = await get(cacheKey);
    const from = data ? "cache" : "server";
    if (!data) {
      // 如果缓存中不存在数据
      console.log("从服务端重新获取快手热榜");
      // 从服务器拉取数据
      const response = await axios.get(url);
      data = getData(response.data);
      updateTime = new Date().toISOString();
      if (!data) {
        ctx.body = {
          code: 500,
          ...routerInfo,
          message: "获取失败",
        };
        return false;
      }
      // 将数据写入缓存
      await set(cacheKey, data);
    }
    ctx.body = {
      code: 200,
      message: "获取成功",
      ...routerInfo,
      from,
      total: data.length,
      updateTime,
      data,
    };
  } catch (error) {
    console.error(error);
    ctx.body = {
      code: 500,
      ...routerInfo,
      message: "获取失败",
    };
  }
});

// 快手热榜 - 获取最新数据
kuaishouRouter.get("/kuaishou/new", async (ctx) => {
  console.log("获取快手热榜 - 最新数据");
  try {
    // 从服务器拉取最新数据
    const response = await axios.get(url);
    const newData = getData(response.data);
    updateTime = new Date().toISOString();
    console.log("从服务端重新获取快手热榜");

    // 返回最新数据
    ctx.body = {
      code: 200,
      message: "获取成功",
      ...routerInfo,
      total: newData.length,
      updateTime,
      data: newData,
    };

    // 删除旧数据
    await del(cacheKey);
    // 将最新数据写入缓存
    await set(cacheKey, newData);
  } catch (error) {
    // 如果拉取最新数据失败，尝试从缓存中获取数据
    console.error(error);
    const cachedData = await get(cacheKey);
    if (cachedData) {
      ctx.body = {
        code: 200,
        message: "获取成功",
        ...routerInfo,
        total: cachedData.length,
        updateTime,
        data: cachedData,
      };
    } else {
      // 如果缓存中也没有数据，则返回错误信息
      ctx.body = {
        code: 500,
        ...routerInfo,
        message: "获取失败",
      };
    }
  }
});

kuaishouRouter.info = routerInfo;
module.exports = kuaishouRouter;