import { PrismaClient } from '@prisma/client';

const prisma = new PrismaClient();

// Lundi de la semaine (en UTC) pour la date courante
function mondayOfThisWeekUTC(now = new Date()) {
  const d = new Date(Date.UTC(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate()));
  const day = d.getUTCDay(); // 0=Dim, 1=Lun, ...
  const diffToMonday = (day + 6) % 7; // 0 si lundi
  d.setUTCDate(d.getUTCDate() - diffToMonday);
  d.setUTCHours(0, 0, 0, 0);
  return d;
}

// Retourne les 5 dates Lundi→Vendredi (UTC, à minuit)
function currentWeekDates() {
  const monday = mondayOfThisWeekUTC();
  return Array.from({ length: 5 }, (_, i) => {
    const d = new Date(monday);
    d.setUTCDate(monday.getUTCDate() + i);
    return d;
  });
}

function rndInt(min: number, max: number) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}
function rndAmount(minCents: number, maxCents: number) {
  const cents = rndInt(minCents, maxCents);
  return (cents / 100).toFixed(2); // string (ex: "123.45")
}

async function main() {
  // On veut explicitement G503 (mileage) et G517 (remboursement)
  const wanted = ['G57', 'G517'] as const;
  const codes = await prisma.bankCodes.findMany({
    where: { bank_code: { in: wanted as unknown as string[] } },
    select: { id: true, bank_code: true },
  });
  const map = new Map(codes.map(c => [c.bank_code, c.id]));
  for (const c of wanted) {
    if (!map.has(c)) throw new Error(`Bank code manquant: ${c}`);
  }

  const employees = await prisma.employees.findMany({ select: { id: true } });
  if (!employees.length) {
    console.warn('Aucun employé — rien à insérer.');
    return;
  }

  const weekDays = currentWeekDates();

  // Règles:
  // - (index % 5) === 0  -> mileage G503 (km)
  // - (index % 5) === 1  -> remboursement G517 ($)
  // Les autres: pas de dépense
  // On met la dépense un des jours de la semaine (déterministe mais varié).
  let created = 0;

  for (let ei = 0; ei < employees.length; ei++) {
    const e = employees[ei];

    const ts = await prisma.timesheets.findFirst({
      where: { employee_id: e.id },
      select: { id: true },
      orderBy: { id: 'asc' }, // ajuste si tu préfères par date
    });
    if (!ts) continue;

    const dayIdx = ei % 5; // 0..4 -> répartit sur la semaine
    const date = weekDays[dayIdx];

    if (ei % 5 === 0) {
      // Mileage (G503) — amount = km
      const km = rndInt(10, 180); // 10..180 km
      await prisma.expenses.create({
        data: {
          timesheet_id: ts.id,
          bank_code_id: map.get('G57')!,
          date,
          amount: km.toString(), // on stocke le nombre de km dans amount (si tu as un champ "quantity_km", remplace ici)
          attachement: null,
          description: `Mileage ${km} km (emp ${e.id})`,
          is_approved: Math.random() < 0.6,
          supervisor_comment: Math.random() < 0.2 ? 'OK' : null,
        },
      });
      created++;
    } else if (ei % 5 === 1) {
      // Remboursement (G517) — amount = $
      const dollars = rndAmount(2000, 25000); // 20.00$..250.00$
      await prisma.expenses.create({
        data: {
          timesheet_id: ts.id,
          bank_code_id: map.get('G517')!,
          date,
          amount: dollars,
          attachement: null,
          description: `Remboursement ${dollars}$ (emp ${e.id})`,
          is_approved: Math.random() < 0.6,
          supervisor_comment: Math.random() < 0.2 ? 'OK' : null,
        },
      });
      created++;
    }
  }

  const total = await prisma.expenses.count();
  console.log(`✓ Expenses: ${created} nouvelles lignes, ${total} total rows (semaine courante)`);
}

main().finally(() => prisma.$disconnect());