// src/scripts/import-users-from-csv.ts
import { PrismaClient, Roles } from '@prisma/client';
import * as fs from 'fs';
import * as path from 'path';

const prisma = new PrismaClient();

// ⚙️ Chemin vers ton CSV (à adapter selon où tu le mets)
const CSV_PATH = path.resolve(__dirname, 'data/export_employee_table.csv');

// Type aligné sur les colonnes du CSV
type CsvUserRow = {
  email: string;
  first_name: string;
  last_name: string;
  phone_number: string;
};

// Petit parseur de ligne CSV sans dépendance
function splitCsvLine(line: string): string[] {
  const result: string[] = [];
  let current = '';
  let inQuotes = false;

  for (let i = 0; i < line.length; i++) {
    const char = line[i];

    if (char === '"') {
      // guillemet échappé ""
      if (inQuotes && line[i + 1] === '"') {
        current += '"';
        i++; // on saute le deuxième
      } else {
        inQuotes = !inQuotes;
      }
    } else if (char === ',' && !inQuotes) {
      result.push(current);
      current = '';
    } else {
      current += char;
    }
  }

  result.push(current);
  return result.map((v) => v.trim());
}

async function main() {
  // 1. Lecture du fichier CSV
  const fileContent = fs.readFileSync(CSV_PATH, 'utf-8');

  const lines = fileContent
    .split(/\r?\n/)
    .map((l) => l.trim())
    .filter((l) => l.length > 0);

  if (lines.length <= 1) {
    console.error('CSV vide ou seulement un header');
    return;
  }

  // 2. Header (noms de colonnes) -> ["email", "first_name", "last_name", "phone_number"]
  const header = splitCsvLine(lines[0]);
  const dataLines = lines.slice(1);

  // 3. Conversion de chaque ligne en objet { email, first_name, last_name, phone_number }
  const records: CsvUserRow[] = dataLines.map((line) => {
    const values = splitCsvLine(line);
    const row: any = {};

    header.forEach((col, idx) => {
      row[col] = values[idx] ?? '';
    });

    return row as CsvUserRow;
  });

  // 4. Mapping vers le format attendu par Prisma (model Users)
  const data = records.map((row) => ({
    email: row.email.trim(),
    first_name: row.first_name.trim(),
    last_name: row.last_name.trim(),
    phone_number: row.phone_number.trim(),
    role: Roles.EMPLOYEE,
    // residence: null, 
  }));

  console.log(`➡️ ${data.length} lignes trouvées dans le CSV`);
  console.log('Exemple importé :', data[0]);

  const result = await prisma.users.createMany({
    data,
  });

  console.log(`✅ ${result.count} utilisateurs insérés dans la DB`);
}

main()
  .catch((err) => {
    console.error('Erreur pendant l’import CSV → DB', err);
    process.exit(1);
  })
  .finally(async () => {
    await prisma.$disconnect();
  });