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

// 接口信息
const routerInfo = {
    name: "github",
    title: "Github",
    subtitle: "trending",
};


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

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

const url = "https://github.com/trending";

const headers = {
    "User-Agent":
        "Mozilla/5.0 (iPhone; CPU iPhone OS 15_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.0 Mobile/15E148 Safari/604.1",
};



// 数据处理
const getData = (data) => {
    if (!data) return false;
    const dataList = [];
    const $ = cheerio.load(data);
    try {
        $(`.Box-row`).each((i,e)=>{
            // console.log(getCheerio(e).html());
            const item= cheerio.load($(e).html())
            // console.log(item);
            const title = item("h2 a").attr('href').replace("\/","")
            const url = `https://github.com/${title}`
            const excerpt = item('p').text().replace(/(^\s*)|(\s*$)/g, "")
            const  language  = item('.f6 span[itemprop="programmingLanguage"]').text().replace(/(^\s*)|(\s*$)/g, "")
            const stars = item('.f6 a:first').text().replace(/(^\s*)|(\s*$)/g, "") 
            const forks = item('.f6 a:eq(1)').text().replace(/(^\s*)|(\s*$)/g, "") 
            const starstoday = item('.f6 span:eq(4)').text().replace(/(^\s*)|(\s*$)/g, "") 
  

            dataList.push({
                title: title,
                desc: excerpt,
                url: url,
                language: language,
                stars: stars,
                forks: forks,
                starstoday: starstoday,

            });
        });
        return dataList;
    } catch (error) {
        console.error("数据处理出错" + error);
        return false;
    }
};



// trending
githubNewRouter.get("/github", async (ctx) => {
    console.log("获取github trending");
    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github trending");
            // 从服务器拉取数据
            const response = await axios.get(url, { headers });
            // console.log(response.data);
            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",
        };
    }
});




// 豆瓣新片榜 - 获取最新数据
githubNewRouter.get("/github/new", async (ctx) => {
    console.log("获取github trending  - 最新数据");
    try {
      // 从服务器拉取最新数据
      const response = await axios.get(url, { headers });
      const newData = getData(response.data);
      updateTime = new Date().toISOString();
      console.log("从服务端重新github trending");
  
      // 返回最新数据
      ctx.body = {
        code: 200,
        message: "获取成功",
        ...routerInfo,
        updateTime,
        total: newData.length,
        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",
        };
      }
    }
  });
  
  githubNewRouter.info = routerInfo;
  module.exports = githubNewRouter;