import cloud from '@lafjs/cloud'
const db = cloud.database();
import Utils from "@/Utils";
export default async function (ctx: FunctionContext) {
  const action = ctx.body.action;
  if(!action){
    return {
      code: 0, data: null, msg: "action缺失"
    }
  }
  const level=ctx.body.level;
  if (!level) {
    return {
      code: 0, data: null, msg: "level缺失"
    }
  }
  const pos=ctx.body.pos;
  if (!pos) {
    return {
      code: 0, data: null, msg: "pos缺失"
    }
  }
  const uid= ctx.body.uid;
  let res = await db.collection("level"+pos).where({level:level}).getOne();
  let comment= res.data?.comment;
  if(!comment){
    await db.collection("level" + pos).add({level:level, comment:[]});
    comment=[];
  }
  switch (action) {
    case 'save':
      let com=ctx.body.comment;
      if (!com) {
        return {
          code: 0, data: null, msg: "请输入评论内容"
        }
      }
      com=JSON.parse(com);
      com.uid=uid;
      com.like=0;
      let ishave=false;
      let index=0;
      for(let i=0;i<comment.length;i++){
        if(comment[i].uid==com.uid){
          index++;
        }
      }
      if(index>=3){
        return {
          code: 0, data: null, msg: "评论数已达上限"
        }
      }
      for(let i=0;i<comment.length;i++){
        if(comment[i].uid==com.uid&&comment[i].content==com.content){
          ishave=true;
        }
      }
      if(ishave==false){
        com.index=comment.length;
        comment.push(com);
        let ret = await db.collection("level" + pos).where({ level: level }).update({ comment: comment });
        return {
          code: 1, data: null, msg: "评论更新成功"
        }
      }else{
        return {
          code: 0, data: null, msg: "请勿重复提交"
        }
      }
      
    case 'read':

      let list=[];
      let index1=0;
      let max=0;
      if(comment.length>5){
        let list1=[];
        for (let i = 0; i < comment.length; i++) {
          if (comment[i].like > max) {
            index1 = i;
            max = comment[i].like;
          }
        }
        list1.push(index1);
        if(comment.length>50){
          while(list1.length<5){
            let index2=Math.floor(Math.random()*comment.length);
            if(!list1.includes(index2)){
              list1.push(index2);
            }
          }
        }else{
          let m=comment.length-1;
          while(list1.length<5){
            if(!list1.includes(m)){
              list1.push(m);
              m--;
            }
          }
        }
        for(let i=0;i<list1.length;i++){
          list.push(comment[list1[i]]);
        }
      }else{
        list=comment;
      }
      
      return {
        code: 1, data: {
          comment:list
        }, msg: "成功"
      }
    case 'like':{
      const index=ctx.body.index;
      if (!index&&index!=0) {
        return {
          code: 0, data: null, msg: "请输入点赞id"
        }
      }
      comment[index].like+=1;
      let ret = await db.collection("level" + pos).where({ level: level }).update({ comment: comment });
      return {
        code: 1, data: null, msg: "成功"
      }
    }
    default:
      return {
        code: 400,
        message: '无效的操作类型，请使用 save 或 read'
      }
  }
}