var express = require('express');
var fs = require('fs');

var parseString = require("xml2js").parseString;
var router = express.Router();
var fileToOpen = 'gtg_tasks'

// const convertFiles = true;
let convertFiles = false;
let computeDataOnExtract = true;

let jsonAllData = {
  tasks : {},
  stats : {},
  projects : {},
  tags : {},
}
/* GET home page. */
/**
 * obtenir la liste de tags que l'on a entré
 */
router.get('/', async function (req, res, next) {

  if(convertFiles){

  convertOneXmlToJson('gtg_tasks',res)
  convertOneXmlToJson('tags',res)
  convertOneXmlToJson('projects',res)
  }else{
    console.log('================== conversion de fichiers désactivée dans index.js ================== ')
  }

  // récupérer le contenu des json
  jsonAllData.tags = require('../sources/tags_gtg.json')
  jsonAllData.tasks = require('../sources/gtg_tasks_gtg.json')

  if(computeDataOnExtract){

  jsonAllData = computeData(jsonAllData)
    computeDataOnExtract =false;
  }else{
    console.log('================== calcul de stats désactivé dans index.js ================== ')
  }
  console.log('json files read' )
  res.render('index', {title: "Conversion de GTG tâches",
    json: jsonAllData,
    getPercentOfOpenTasks})
});

async function readfileJson(fileToOpen){
  fs.readFile(`sources/${fileToOpen}`, "utf-8", function (err, data) {
    if (err) console.log(err);
    console.log('ok ', fileToOpen )
    return JSON.parse(data)
  });
}

function computeData(jsonAllData){

  // trouver le nombre de tâches ayant un tag en particulier
  // et rajouter ce nombre à chaque tag, dans countTasks : N
  // let tagCountTasks = Object.create(jsonAllData.tags);

  jsonAllData.stats = {
    tasksCount : jsonAllData.tasks.project.task.length,
    tasksClosed : 0,
    tasksOpen : 0,
    listOpen: [],
    listClosed: [],
  }

  for(let t of jsonAllData.tasks.project.task ) {
    // console.log('t', t)
    let tags = t["$"].tags.split(',')
    for(let tag of tags){
      // console.log('tag', tag)
      jsonAllData.tags.tagstore.tag.map( elem =>{
        // console.log('elem', elem)
        if(elem['$'].name == tag){
          if(!elem.tasks){
            elem.tasks = 0
          }
          if(!elem.tasksListById){
            elem.tasksListById = []
          }
          if(!elem.tasksListByTitle){
            elem.tasksListByTitle = []
          }
          if(!elem.tasksListIsActiveByTitle){
            elem.tasksListIsActiveByTitle = []
          }
          if(!elem.tasksListIsDoneByTitle){
            elem.tasksListIsDoneByTitle = []
          }
          elem.tasks++
          elem.tasksListById.push(t['$'].id)
          elem.tasksListByTitle.push(t.title)
          if(t['$'].status == "Active"){
          elem.tasksListIsActiveByTitle.push(t.title)
          }
          if(t['$'].status == "Done"){
          elem.tasksListIsDoneByTitle.push(t.title)
          }
        }
      })
    }
    if(t.donedate){
      jsonAllData.stats.tasksClosed++;
      jsonAllData.stats.listOpen.push(t);
    }else{
      jsonAllData.stats.tasksOpen++;
    }
    // console.log('tags', tags)
  }
  return jsonAllData

}
function convertOneXmlToJson(fileToOpen,res){
  fs.readFile(`sources/${fileToOpen}.xml`, "utf-8", function (err, data) {
    if (err) console.log(err);
    const results = transformToJson(data, fileToOpen, res)
    console.log('fichier converti en json', fileToOpen)

  });
}

function getPercentOfOpenTasks(someCount){
  return Math.round( 100*someCount / jsonAllData.stats.tasksOpen)
}
function transformToJson(xml,fileToOpen, res) {
  return parseString(xml, function (err, result) {
    if (err) console.log(err);

    // console.dir(JSON.stringify(result));
    console.log('Done');

    // write file to disk
    fs.writeFile(`sources/${fileToOpen}_gtg.json`, JSON.stringify(result, null, 4), 'utf8', (err) => {

      if (err) {
        console.log(`Error writing file: ${err}`);
        // return JSON.stringify(result)

        res.send(err)
      } else {
        console.log(`File \`sources/${fileToOpen}_gtg.json\` is written successfully!`);

      }

    });
  });
}


module.exports = router;