const cloud = require('wx-server-sdk');
cloud.init({
  env: cloud.DYNAMIC_CURRENT_ENV
})

const config = {
  submitPagesGapDay: 1,
  clearPageHistoryGapDay: 30
};

const milliSecondsPerDay = 24*60*60*1000;

const collectionNameMap = {
  pageHistory: "pageHistory"
}

const PagePathMap = {
  shixun:"markdown/shixun/shixun/shixun",
  path:"markdown/path/path/path"
}


exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext();
  console.log(event);
  let {TriggerName, Time} = event;
  switch(TriggerName){
    case "submitPages":{
      return submitPages({Time});
    }
    case "clearPageHistory":{
      return clearPageHistory({Time});
    }
  }
}

async function submitPages({Time}){
  console.log("start submitPages");
  const db = cloud.database();
  const _ = db.command;
  const pageHistoryCollection = db.collection(collectionNameMap.pageHistory);

  let shixunPath = PagePathMap.shixun;
  let pathPath  = PagePathMap.path;
  let timeEnd = new Date(Time);
  let timeStart = new Date(timeEnd.getTime() - config.submitPagesGapDay*milliSecondsPerDay);

  let shixunResult =  await pageHistoryCollection.where({
    page: shixunPath,
    status: 200,
    isCrawl: false,
    time: _.lt(timeEnd).and(_.gte(timeStart))
  }).get();

  let pathResult = await pageHistoryCollection.where({
    page: pathPath,
    status: 200,
    isCrawl: false,
    time:_.lt(timeEnd).and(_.gte(timeStart))
  }).get();

  let shixunQueries = shixunResult.data.reduce(function(arr, v){
    var query = Object.keys(v.options).map(k=>`${k}=${v.options[k]}`).join("&");
    if(arr.indexOf(query)==-1) 
      arr.push(query); 
    return arr
  },[]);

  let pathQueries = pathResult.data.reduce(function(arr, v){
    var query = Object.keys(v.options).map(k=>`${k}=${v.options[k]}`).join("&");
    if(arr.indexOf(query)==-1) 
      arr.push(query); 
    return arr
  },[]);

  console.info("shixunQueries", shixunQueries.length, shixunQueries);
  console.info("pathQueries", pathQueries.length, pathQueries);

  if(shixunQueries.length>0){
    var pages = shixunQueries.map(i=>{
      return {
        path: shixunPath,
        query: i
      }
    });
    var res = await cloud.openapi.search.submitPages({pages});
    console.log("submit shixun pages",pages.length, res);
    console.info("arguments", pages);
  }else{
    console.warn("no shixun history");
  }
  if(pathQueries.length>0){
    var pages = pathQueries.map(i=>{
      return {
        path: pathPath,
        query: i
      }
    });
    var res = await cloud.openapi.search.submitPages({pages});
    console.log("submit path pages success", pages.length, res);
    console.info("arguments", pages);
  }else{
    console.warn("no path history");
  }
  return {code:0, message:"success"};
}

async function clearPageHistory({Time}){
  console.log("clearPageHistory", Time);

  let now = new Date(Time);
  let timeEnd = new Date(now.getTime() - config.clearPageHistoryGapDay*milliSecondsPerDay);

  const db = cloud.database();
  const _ = cloud.command;
  const pageHistoryCollection = db.collection(collectionNameMap.pageHistory);

  let res = await pageHistoryCollection.where({
    time: _.lt(timeEnd)
  }).remove();
  
  console.log("remove page History result: ", res);
  return {code: 0, message:"success", data:res};
}