const { database } = require('../database')
const dayjs = require('dayjs')

async function updateCurrentYears() {
  const fullDate = dayjs().format('YYYY-MM-DD')

  // Clear current year flag
  const clearCurrent = database.prepare('UPDATE anneescolaire SET is_Current = 0 WHERE id > 0')
  clearCurrent.run()

  // Set the new current year
  const updateCurrent = database.prepare(`
    UPDATE anneescolaire
    SET is_Current = 1
    WHERE ? >= debut AND ? <= fin
  `)
  // console.log();
  updateCurrent.run(fullDate, fullDate)

  // Check if the update was successful
  const check = database
    .prepare(
      `
    SELECT * FROM anneescolaire
    WHERE ? >= debut AND ? <= fin
  `
    )
    .get(fullDate, fullDate)

  // Insert into traitmentsystem if a current year exists
  if (check) {
    let search = database.prepare('SELECT * FROM traitmentsystem WHERE code = ?').get(check.code)
    console.log(search)
    if (!search) {
      const insertQuery = database.prepare(`
        INSERT INTO traitmentsystem (code, debut, fin)
        VALUES (?, ?, ?)
      `)
      insertQuery.run(check.code, check.debut, check.fin)
    }
  } else {
    console.log('No active school year found for the current date.')
  }
}

async function updateStudents() {
  const getInfinishedYears = database
    .prepare('SELECT * FROM traitmentsystem WHERE is_finished = 0 ORDER BY id ASC')
    .get()

  const allEtudiants = database
    .prepare('SELECT * FROM etudiants WHERE annee_scolaire = ?')
    .all(getInfinishedYears.code)

  function checkNull(params) {
    if (params == null || params == undefined) {
      return null
    }
    return params
  }

  function compareSessionNotes(session1, session2) {
    let notes
    if (session2) {
      if (session1 < session2.note) {
        notes = session2.note
      } else {
        notes = session1
      }
    } else {
      notes = session1
    }
    return notes
  }

  database.transaction(() => {
    // get all note of student
    const queryNotes = database.prepare(
      `SELECT DISTINCT etudiant_id FROM notes WHERE etudiant_niveau = ? AND annee_scolaire = ?`
    )
    let allEtudiantWithNotes = []
    let etudiantWithNotes = []
    let dataToMap = []
    let allEtudiantWithNotesRepech = []
    let etudiantWithNotesRepech = []

    for (const etudiant of allEtudiants) {
      const results = queryNotes.all(etudiant.niveau, etudiant.annee_scolaire)
      etudiantWithNotes.push(...results) // Avoid nested arrays
    }

    const uniqueId = etudiantWithNotes.filter(
      (item, index, self) => index === self.findIndex((t) => t.etudiant_id === item.etudiant_id)
    )

    const query2 = database.prepare(
      'SELECT notes.*, etudiants.*, matieres.id, matieres.nom AS nomMat, matieres.credit FROM notes LEFT JOIN etudiants ON (notes.etudiant_id = etudiants.id) LEFT JOIN matieres ON (notes.matiere_id = matieres.id) WHERE notes.etudiant_id = ?'
    )

    for (let j = 0; j < uniqueId.length; j++) {
      allEtudiantWithNotes.push(query2.all(uniqueId[j].etudiant_id))
    }

    const query = database.prepare(
      `SELECT DISTINCT etudiant_id FROM notesrepech WHERE etudiant_niveau = ? AND annee_scolaire = ?`
    )

    for (const etudiant of allEtudiants) {
      const results = query.all(etudiant.niveau, etudiant.annee_scolaire)
      etudiantWithNotesRepech.push(...results) // Avoid nested arrays
    }

    const uniqueIdRepech = etudiantWithNotes.filter(
      (item, index, self) => index === self.findIndex((t) => t.etudiant_id === item.etudiant_id)
    )

    const query2Repech = database.prepare(
      'SELECT notesrepech.*, etudiants.*, matieres.id, matieres.nom AS nomMat, matieres.credit FROM notesrepech INNER JOIN etudiants ON (notesrepech.etudiant_id = etudiants.id) INNER JOIN matieres ON (notesrepech.matiere_id = matieres.id) WHERE notesrepech.etudiant_id = ?'
    )

    for (let j = 0; j < uniqueIdRepech.length; j++) {
      allEtudiantWithNotesRepech.push(query2Repech.all(uniqueIdRepech[j].etudiant_id))
    }

    for (let index = 0; index < allEtudiantWithNotes.length; index++) {
      let total = 0
      let note = 0
      let totalCredit = 0

      // Create a new object for each student
      let modelJson = {
        id: '',
        nom: '',
        prenom: '',
        photos: '',
        moyenne: '',
        mention: '',
        niveau: '',
        annee_scolaire: ''
      }

      for (let j = 0; j < allEtudiantWithNotes[index].length; j++) {
        modelJson.id = allEtudiantWithNotes[index][j].etudiant_id
        modelJson.nom = allEtudiantWithNotes[index][j].nom
        modelJson.prenom = allEtudiantWithNotes[index][j].prenom
        modelJson.photos = allEtudiantWithNotes[index][j].photos
        modelJson.mention = allEtudiantWithNotes[index][j].mention_id
        modelJson.niveau = allEtudiantWithNotes[index][j].niveau
        modelJson.annee_scolaire = allEtudiantWithNotes[index][j].annee_scolaire

        // console.log(checkNull(session[index][j]));
        if (allEtudiantWithNotesRepech[index]) {
          note +=
            compareSessionNotes(
              allEtudiantWithNotes[index][j].note,
              checkNull(allEtudiantWithNotesRepech[index][j])
            ) * allEtudiantWithNotes[index][j].credit
        } else {
          note += allEtudiantWithNotes[index][j].note * allEtudiantWithNotes[index][j].credit
        }
        totalCredit += allEtudiantWithNotes[index][j].credit
      }

      total = note / totalCredit
      modelJson.moyenne = total.toFixed(2)

      // Add the new object to the array
      dataToMap.push(modelJson)
    }

    // update all etudiant
    let updated = false
    if (dataToMap.length != 0) {
      let noteSystem = database.prepare('SELECT * FROM notesystems').get()
      for (let index = 0; index < dataToMap.length; index++) {
        if (dataToMap[index].moyenne >= noteSystem.admis) {
          let updateQuery = database.prepare(
            'UPDATE etudiants SET niveau = ?, annee_scolaire = ?, status = ? WHERE id = ?'
          )
          updateQuery.run(
            nextLevel(dataToMap[index].niveau),
            updateSchoolYear(dataToMap[index].annee_scolaire),
            2,
            dataToMap[index].id
          )
          updated = true
        } else if (
          dataToMap[index].moyenne < noteSystem.admis &&
          dataToMap[index].moyenne >= noteSystem.redouble
        ) {
          let updateQuery = database.prepare(
            'UPDATE etudiants SET niveau = ?, annee_scolaire = ? status = ? WHERE id = ?'
          )
          updateQuery.run(
            dataToMap[index].niveau,
            updateSchoolYear(dataToMap[index].annee_scolaire),
            3,
            dataToMap[index].id
          )
          updated = true
        } else {
          let updateQuery = database.prepare(
            'UPDATE etudiants SET niveau = ?, annee_scolaire = ? status = ? WHERE id = ?'
          )
          updateQuery.run(
            dataToMap[index].niveau,
            dataToMap[index].annee_scolaire,
            4,
            dataToMap[index].id
          )
          updated = true
        }
      }
    }

    if (updated) {
      const updateInfinishedYears = database.prepare(
        'UPDATE traitmentsystem SET is_finished = 1 WHERE id = ?'
      )

      updateInfinishedYears.run(getInfinishedYears.id)
    }
  })()
}

function nextLevel(niveau) {
  if (niveau == 'L1') {
    return 'L2'
  } else if (niveau == 'L2') {
    return 'L3'
  } else if (niveau == 'L3') {
    return 'M1'
  } else if (niveau == 'M1') {
    return 'M2'
  } else if (niveau == 'M2') {
    return 'D1'
  } else if (niveau == 'D1') {
    return 'D2'
  } else if (niveau == 'D2') {
    return 'D3'
  } else if (niveau == 'D3') {
    return 'PHD'
  }
}

function updateSchoolYear(year) {
  // Split the year into two parts
  const [startYear, endYear] = year.split('-').map(Number)

  // Increment both the start and end year by 1
  const newStartYear = startYear + 1
  const newEndYear = endYear + 1

  // Join the new years with a hyphen
  const newYear = `${newStartYear}-${newEndYear}`

  return newYear
}

async function matiereSysteme(etudiant_niveau) {
  let systeme
  if (etudiant_niveau == 'L1') {
    systeme = ['S1', 'S2']
  } else if (etudiant_niveau == 'L2') {
    systeme = ['S3', 'S4']
  } else if (etudiant_niveau == 'L3') {
    systeme = ['S5', 'S6']
  } else if (etudiant_niveau == 'M1') {
    systeme = ['S7', 'S8']
  } else if (etudiant_niveau == 'M2') {
    systeme = ['S9', 'S10']
  } else if (etudiant_niveau == 'D1') {
    systeme = ['S11', 'S12']
  } else if (etudiant_niveau == 'D2') {
    systeme = ['S13', 'S14']
  } else if (etudiant_niveau == 'D3') {
    systeme = ['S15', 'S16']
  }

  return systeme
}

async function matiereSystemReverse(semestre) {
  if (semestre == 'S1' || semestre == 'S2') {
    return 'L1'
  } else if (semestre == 'S3' || semestre == 'S4') {
    return 'L2'
  } else if (semestre == 'S5' || semestre == 'S6') {
    return 'L3'
  } else if (semestre == 'S7' || semestre == 'S8') {
    return 'M1'
  } else if (semestre == 'S9' || semestre == 'S10') {
    return 'M2'
  } else if (semestre == 'S11' || semestre == 'S12') {
    return 'D1'
  } else if (semestre == 'S13' || semestre == 'S14') {
    return 'D2'
  } else if (semestre == 'S15' || semestre == 'S16') {
    return 'D3'
  }
}

async function getNessesarytable() {
  try {
    const query = await database.prepare('SELECT * FROM nessesaryTable').get()

    return query
  } catch (error) {
    return error
  }
}

async function updateNessesaryTable(id, multiplicateur) {
  const query = database.prepare('UPDATE nessesaryTable SET uniter_heure = ? WHERE id = ?')

  try {
    let update = query.run(multiplicateur, id)

    return update
  } catch (error) {
    return error
  }
}

module.exports = {
  matiereSysteme,
  updateCurrentYears,
  updateStudents,
  getNessesarytable,
  updateNessesaryTable,
  matiereSystemReverse
}