import { promises } from 'fs';
import path from 'path';
import { randomUUID } from 'crypto';

const getDataPath = (filename) => {
  const cwd = process.cwd();
  if (cwd.endsWith(".output")) {
    return path.join(cwd, "../public/data", filename);
  }
  return path.join(cwd, "public/data", filename);
};
const TERMINE_FILE = getDataPath("termine.csv");
async function readTermine() {
  try {
    const data = await promises.readFile(TERMINE_FILE, "utf-8");
    const lines = data.split("\n").filter((line) => line.trim() !== "");
    if (lines.length < 2) return [];
    const termine = [];
    for (let i = 1; i < lines.length; i++) {
      const values = [];
      let current = "";
      let inQuotes = false;
      for (let j = 0; j < lines[i].length; j++) {
        const char = lines[i][j];
        if (char === '"') {
          inQuotes = !inQuotes;
        } else if (char === "," && !inQuotes) {
          values.push(current.trim());
          current = "";
        } else {
          current += char;
        }
      }
      values.push(current.trim());
      if (values.length >= 4) {
        termine.push({
          id: randomUUID(),
          // Generate ID on-the-fly for editing
          datum: values[0],
          titel: values[1],
          beschreibung: values[2],
          kategorie: values[3]
        });
      }
    }
    return termine;
  } catch (error) {
    if (error.code === "ENOENT") {
      return [];
    }
    console.error("Fehler beim Lesen der Termine:", error);
    return [];
  }
}
async function writeTermine(termine) {
  try {
    let csv = '"datum","titel","beschreibung","kategorie"\n';
    for (const termin of termine) {
      const datum = termin.datum || "";
      const titel = termin.titel || "";
      const beschreibung = termin.beschreibung || "";
      const kategorie = termin.kategorie || "";
      const escapedDatum = datum.replace(/"/g, '""');
      const escapedTitel = titel.replace(/"/g, '""');
      const escapedBeschreibung = beschreibung.replace(/"/g, '""');
      const escapedKategorie = kategorie.replace(/"/g, '""');
      csv += `"${escapedDatum}","${escapedTitel}","${escapedBeschreibung}","${escapedKategorie}"
`;
    }
    await promises.writeFile(TERMINE_FILE, csv, "utf-8");
    return true;
  } catch (error) {
    console.error("Fehler beim Schreiben der Termine:", error);
    return false;
  }
}
async function saveTermin(terminData) {
  const termine = await readTermine();
  const newTermin = {
    datum: terminData.datum,
    titel: terminData.titel,
    beschreibung: terminData.beschreibung || "",
    kategorie: terminData.kategorie || "Sonstiges"
  };
  termine.push(newTermin);
  termine.sort((a, b) => new Date(a.datum) - new Date(b.datum));
  await writeTermine(termine);
  return true;
}
async function deleteTermin(terminData) {
  let termine = await readTermine();
  termine = termine.filter(
    (t) => !(t.datum === terminData.datum && t.titel === terminData.titel && t.beschreibung === terminData.beschreibung && t.kategorie === terminData.kategorie)
  );
  await writeTermine(termine);
  return true;
}

export { deleteTermin as d, readTermine as r, saveTermin as s };
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