require('dotenv').config()
const luxon = require('luxon');
const { WebUntis } = require('webuntis');
const PocketBase = require('pocketbase/cjs');

const pb = new PocketBase('https://fsae41.de');

async function getTimetabe() {
  const untis = new WebUntis(process.env.WEBUNTIS_SCHOOL, process.env.WEBUNTIS_USER, process.env.WEBUNTIS_PASS, process.env.WEBUNTIS_URL);
  let timetable;
  try {
    await untis.login();
    // Start und Ende der aktuellen Woche bestimmen

    const now = luxon.DateTime.local();
    const startOfWeek = now.startOf('week').toJSDate(); // Montag
    const endOfWeek = now.endOf('week').plus({ days: 7 * 4 * 4 }).toJSDate();     // Sonntag

    // Stundenplan für diese Woche abrufen
    timetable = await untis.getOwnTimetableForRange(startOfWeek, endOfWeek);

    await untis.logout();
  } catch (error) {
    console.log(error);
  }
  return timetable;
}


setInterval(async () => {
  const timetable = await getTimetabe();

  if (!timetable || timetable.length === 0) {
    console.log("No timetable data available.");
    return;
  }


  let created = 0;
  let updated = 0;
  let skipped = 0;


  const sorted = timetable.sort((a, b) => {
    // Zuerst nach Datum
    if (a.date !== b.date) {
      return a.date - b.date;
    }
    // Falls Datum gleich, nach Startzeit
    if (a.startTime !== b.startTime) {
      return a.startTime - b.startTime;
    }
    // Falls Startzeit gleich, nach Endzeit
    return a.endTime - b.endTime;
  });

  let final = []

  for (let i = 0; i < sorted.length - 1; i++) {
    let now = sorted[i];
    let next = sorted[i + 1];
    //gleicher tag
    if (now.date == next.date) {
      if (now.endTime == next.startTime) {
        now.endTime = next.endTime;
        final.push(now);
      }
    }
  }

  pb.autoCancellation(false);

  const records = await pb.collection('classes').getFullList();
  //console.log(records);

  for (let i = 0; i < final.length; i++) {
    let existingRecords;

    try {
      existingRecords = await pb.collection('classes').getList(1, 0, {
        filter: 'untis_id = "' + final[i].id + '"',
      });
      existingRecords = existingRecords.items[0];
    } catch (error) {
    }
    //console.log(typeof existingRecords);


    if (!existingRecords) {
      // Neu erstellen 
      const data = {
        "untis_id": final[i].id,
        "date": final[i].date,
        "startTime": final[i].startTime,
        "endTime": final[i].endTime,
        "ro": JSON.stringify(final[i].ro),
        "su": JSON.stringify(final[i].su),
        "kl": JSON.stringify(final[i].kl),
        "raw": JSON.stringify(final[i]),
        "old_version": "JSON"
      };

      const record = await pb.collection('classes').create(data);
      created++;
      continue; // Überspringe die Erstellung, wenn der Datensatz bereits existiert
    }

    //console.log("Record with untis_id " + final[i].id + " already exists. Skipping creation.");

    // Prüfe, ob etwas geändert wurde
    const isChanged =
      existingRecords.date != final[i].date ||
      existingRecords.startTime != final[i].startTime ||
      existingRecords.endTime != final[i].endTime ||
      (existingRecords.kl[0].id != final[i].kl[0].id) ||
      (existingRecords.ro[0].id != final[i].ro[0].id) ||
      (existingRecords.su[0].id != final[i].su[0].id);

    if (!isChanged) {
      skipped++;
      continue;
    }

    // Aktualisiere den bestehenden Datensatz
    existingRecords.old_version = existingRecords.raw;
    existingRecords.raw = JSON.stringify(final[i]);
    existingRecords.date = final[i].date;
    existingRecords.startTime = final[i].startTime;
    existingRecords.endTime = final[i].endTime;
    existingRecords.kl = final[i].kl;
    existingRecords.ro = final[i].ro;
    existingRecords.su = final[i].su;
    existingRecords.last_update = new Date().toISOString();

    const record = await pb.collection('classes').update(existingRecords.id, existingRecords);

    updated++;
  }

  console.log(`✅ Sync done — Created: ${created}, Updated: ${updated}, Skipped: ${skipped}`);

}, 1000 * 60 * 30); // Alle 30 Minuten aktualisieren