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,
    getPercent,
    computeBgColorOnProportionOfOpenTasks,
    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 getPercent(someCount, total) {
  return Math.round(100 * someCount / total)
}

function computeBgColorOnProportionOfOpenTasks(someProportionNumber) {
  let result = '';

  if(someProportionNumber >= 95){
    result = 'proportion-over-95'
  }
  else if(someProportionNumber >= 90){
    result = 'proportion-over-90'
  }
  else if(someProportionNumber >= 80){
    result = 'proportion-over-80'
  }
  else if(someProportionNumber >= 65){
    result = 'proportion-over-65'
  }
  else if(someProportionNumber >= 50){
    result = 'proportion-over-50'
  }
  else if(someProportionNumber >= 40){
    result = 'proportion-over-40'
  }
  else if(someProportionNumber >= 25){
    result = 'proportion-over-25'
  }
  else if(someProportionNumber >= 15){
    result = 'proportion-over-15'
  }

  console.log('result', someProportionNumber, result)
  return result;
}

function exportToMarkdown() {

}

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;