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

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

let 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 ================== ')
  }
  exportToMarkdown(res)
  console.log('json files read')
  res.render('index', {
    title: "Conversion de GTG tâches",
    json : jsonAllData,
    markdown : markdownExportData,
    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,
    maxTasksCountPerTag: 0,
    listOpen           : [],
    listOpenWeekly     : [],
    listOpenMonthly    : [],
    listClosed         : [],
    listClosedWeekly   : [],
    listDevWeeklyClosed   : [],
    listClosedMonthly  : [],
  }
  let now = new Date();

  for (let t of jsonAllData.tasks.project.task) {
    // console.log('t', t)
    let tags = t["$"].tags.split(',')
    // count open and closed tasks

    let dateOfTask = new Date()

    if (t['$'].status == 'Active') {
      jsonAllData.stats.listOpen.push(t)
      let addeddate = new Date(t.addeddate)
      let daysDiff = getNumberOfDaysDiffTwoDates(addeddate, now);

      if (daysDiff <= 7) {
        jsonAllData.stats.listOpenWeekly.push(t)
      } else if (daysDiff >= 7 & daysDiff <= 31) {
        jsonAllData.stats.listOpenMonthly.push(t)
      }

    } else if (t['$'].status == 'Done') {
      jsonAllData.stats.listClosed.push(t)
      let donedate = new Date(t.donedate)
      let daysDiff = getNumberOfDaysDiffTwoDates(donedate, now);

      if (daysDiff <= 7) {
        jsonAllData.stats.listClosedWeekly.push(t)

        // tâches uniquement de dev
        if((/\b(dev|sysadmin|écriture|edu|fediverse)\b/g).test(t['$'].tags)
           ){
          jsonAllData.stats.listDevWeeklyClosed.push(t)
        }
      } else if (daysDiff >= 7 & daysDiff <= 31) {
        jsonAllData.stats.listClosedMonthly.push(t)
      }

    }

    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 (elem.tasks > jsonAllData.stats.maxTasksCountPerTag) {
          jsonAllData.stats.maxTasksCountPerTag = elem.tasks
        }
      })

    }
  }
  // sort tags by name

  return jsonAllData

}

const oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
function getNumberOfDaysDiffTwoDates(firstDate, secondDate) {
  return Math.round(Math.abs((firstDate - secondDate) / oneDay));
}

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'
  }

  return result;
}
let datenow = new Date();
let markdownExportData = ''
function exportToMarkdown(res) {


  markdownExportData =  `# Export de Tâches GTG \n date:   ` + datenow.toLocaleString()
  // fichier de rapport des tâches fermées durant les 7 derniers jours
  markdownExportData += `\n# Rapport hebdomadaire de dev  `;
  markdownExportData += `\n##  ${jsonAllData.stats.listDevWeeklyClosed.length}  ont été fermées  `;
  jsonAllData.stats.listDevWeeklyClosed.map(elem => {
    markdownExportData += `\n * ${elem.title}`;
  })
  markdownExportData += `\n   `;
  markdownExportData += `\n---`;
  markdownExportData += `\n   `;
  markdownExportData += `\n# Rapport des tâches durant les 7 derniers jours  `;
  markdownExportData += `\n   `;
  markdownExportData += `\n##  ${jsonAllData.stats.listClosedWeekly.length}  ont été fermées  `;
  markdownExportData += `\n   `;
  jsonAllData.stats.listClosedWeekly.map(elem => {
    markdownExportData += `\n * ${elem.title}`;
  })
  markdownExportData += `\n## ${jsonAllData.stats.listOpenWeekly.length}  ont été ouvertes  `;
  markdownExportData += `\n   `;
  jsonAllData.stats.listOpenWeekly.map(elem => {
    markdownExportData += `\n * ${elem.title}`;
  })
  markdownExportData += `\n---  `;
  // fichier de rapport des tâches fermées durant les 31 derniers jours
  markdownExportData += `\n# Rapport des autres tâches durant le mois  `;
  markdownExportData += `\n   `;
  markdownExportData += `\n##  ${jsonAllData.stats.listClosedMonthly.length} ont été fermées  `;
  markdownExportData += `\n   `;
  jsonAllData.stats.listClosedMonthly.map(elem => {
    markdownExportData += `\n * ${elem.title}`;
  })
  markdownExportData += `\n## ${jsonAllData.stats.listOpenMonthly.length} ont été ouvertes  `;
  markdownExportData += `\n   `;
  jsonAllData.stats.listOpenMonthly.map(elem => {
    markdownExportData += `\n * ${elem.title}`;
  })

  markdownExportData += `\n---  `;
  // stats de fermeture des tâches
  markdownExportData += `\n# Stats de fermeture des tâches  `;
  markdownExportData += `\n   `;
  markdownExportData += `\n---  `;
  markdownExportData += `\n   `;
  markdownExportData += `\n# Export de toutes les ${jsonAllData.stats.listOpen.length} tâches ouvertes GTG \n   `;
  markdownExportData += `\n   `;

  // jsonAllData.stats.listOpen.map(elem => {
  //   dataTagsMd += `\n## ${elem.title}  `;
  //   dataTagsMd += `\n  statut : ${elem['$'].status}  `;
  //   dataTagsMd += `\n  créé le : ${elem.addeddate}  `;
  //   dataTagsMd += `\n  modifié le : ${elem.modified}  `;
  //   dataTagsMd += `\n  prévu pour : ${elem.duedate | ''}  `;
  //   dataTagsMd += `\n  ${elem.content}  `;
  // })
  markdownExportData += `\n---  `;
  markdownExportData += `\n   `;
  markdownExportData += `\n# Export de toutes les ${jsonAllData.stats.listClosed.length}  tâches fermées GTG \n   `;
  markdownExportData += `\n   `;
  //
  // jsonAllData.stats.listClosed.map(elem=>{
  //   dataTagsMd += `\n * ${elem.title}  `;
  // })

  markdownExportData += `\n   `;
  markdownExportData += `\n# Export de Tags GTG \n   `;
  markdownExportData += `\n   `;
  markdownExportData += `\n   `;

  let sortedTagsByTitle = _.sortBy(jsonAllData.tags.tagstore.tag, [(o) => {
    o["$"].name
  }])

  sortedTagsByTitle.map(elem => {
    markdownExportData += `\n * ${elem['$'].name} , ${elem.tasks | 0}`;
  })

  markdownExportData += `\n   `;
  markdownExportData += `\n rapport généré avec gtg2nodejs par tykayn - contact@cipherbliss.com  `;
  // write file to disk
  fs.writeFile(`output/export_hebdo.md`, markdownExportData, `utf8`, (err) => {

    if (err) {
      console.log(`Error writing file: ${err}`);
      res.send(err)
    } else {
      console.log(`File \`output/export_tags.md\` is written successfully!`);

    }

  });

}

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;