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Filename : tenureHelper.js
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import { user } from '../models/user.models.js';
import { UserTenure } from '../models/userTenure.model.js';

// Add exactly one tenure-year to a date.
export const addOneTenureYear = (date) => {
  const d = new Date(date);
  if (d.getUTCMonth() === 1 && d.getUTCDate() === 29) {
    d.setTime(d.getTime() + 365 * 24 * 60 * 60 * 1000);
  } else {
    d.setUTCFullYear(d.getUTCFullYear() + 1);
  }
  return d;
};

// Given a user's joined_on date and any target date, return which tenure
// window the target falls in: { tenureIndex (1-based), start (Date), end (Date exclusive) }
export const getTenureForDate = (joinedOn, targetDate) => {
  let start = new Date(joinedOn);
  let tenureIndex = 1;
  while (true) {
    const end = addOneTenureYear(start);
    if (targetDate < end) {
      return { tenureIndex, start, end };
    }
    start = end;
    tenureIndex++;
  }
};

// All tenure windows from join date through the window that contains refDate (inclusive).
export const listTenureWindowsFromJoinThroughDate = (joinedOn, refDate) => {
  const windows = [];
  let start = new Date(joinedOn);
  let tenureIndex = 1;
  while (true) {
    const end = addOneTenureYear(start);
    windows.push({
      tenureIndex,
      start: new Date(start.getTime()),
      end: new Date(end.getTime()),
    });
    if (refDate < end) break;
    start = end;
    tenureIndex += 1;
  }
  return windows;
};

// Find or create the userTenure document for the tenure that contains targetDate.
export const ensureUserTenure = async (userId, joinedOn, targetDate) => {
  const { tenureIndex, start, end } = getTenureForDate(joinedOn, targetDate);
  const existing = await UserTenure.findOne({ userId, tenureIndex }).lean();
  if (existing) return existing;
  const u = await user.findById(userId).select('first_name last_name').lean();
  const first_name = u?.first_name ?? '';
  const last_name = u?.last_name ?? '';
  const doc = await UserTenure.findOneAndUpdate(
    { userId, tenureIndex },
    {
      $setOnInsert: {
        userId,
        tenureIndex,
        startDate: start,
        endDate: end,
        first_name,
        last_name,
        paidLeavesAllocated: 12,
        paidLeavesUsed: 0,
        occasionalOffsUsed: 0,
        unpaidLeavesUsed: 0,
      },
    },
    { upsert: true, new: true }
  );
  return doc;
};