const express=require("express");
const app=express();
const fs=require("fs");
const path=require("path");
const url=require("url");
app.use(express.static("public",{
    index:"res.html"
}))
app.use(express.json());
//登录
app.post("/api/login",(req,res)=>{
    let{user,pwd}=req.body;
    let data=JSON.parse(fs.readFileSync("./mock/use.json"));
    let flag=data.find(item=>item.user===user&&item.pwd===pwd);
    if(flag){
        res.send({
            code: 1,
            mess: "登录成功",
            id: flag.id,
        })
    }else{
        res.send("0");
    }
})
//注册
app.post("/api/res",(req,res)=>{
    let{user,pwd}=req.body;
    let data=JSON.parse(fs.readFileSync("./mock/use.json"));
    let flag=data.find(item=>item.user===user&&item.pwd===pwd);
    if(flag){
        res.send("1");
    }else{
        res.send("0");
    }
})
//添加数据
app.post("/api/add",(req,res)=>{
    let data=JSON.parse(fs.readFileSync("./mock/list.json"));
    data.push(req.body);
    fs.writeFileSync("./mock/list.json",JSON.stringify(data));
    res.send({code:1});
})
//查询数据
app.get("/api/list",(req,res)=>{
    let data=JSON.parse(fs.readFileSync("./mock/list.json"));
    res.send(data);
})
//删除数据
app.post("/api/del",(req,res)=>{
    let {id}=req.body;
    let data=JSON.parse(fs.readFileSync("./mock/list.json"));
    data=data.filter(item=>item.id!==id);
    fs.writeFile("./mock/list.json",JSON.stringify(data),(err)=>{
        if(err){
            res.send({
                code:0,
                mess:"删除失败",
            })
            return;
        }
            res.send({
                code:1,
                mess:"删除成功",
            })
    })
})
//分页
app.post("/api/lis",(req,res)=>{
    let {index,num}=req.body;
    let data=JSON.parse(fs.readFileSync("./mock/list.json"));
    let len=Math.ceil(data.length/num);
    let star=index*num;
    let end=(index+1)*num;
    
    res.send({
        code:1,
        maxlen:len,
        arr:data.slice(star,end),
    });
})
app.listen(5577,()=>console.log("服务器正在启动"));