/**
 * Copyright (c) 2026 Niolla
 * All rights reserved.
 *
 * This source code is proprietary and confidential.
 * Unauthorized copying, modification, distribution, or use
 * of this file, via any medium, is strictly prohibited.
 */

// app/utils/calendar.util.js

const db = require("../models");
const { log } = require("./consoleLog.utill");

const Calendar = db.calender;
const CalenderHoliday = db.calenderHolidays;


const calculateDeadline = async () => {
    let deadlineDate = new Date();

    const currentYear = deadlineDate.getFullYear();

    // Get calendar for current year
    const calendar = await Calendar.findOne({
        where: {
            year: currentYear
        }
    });

    if (!calendar) {
        throw new Error(`Calendar for year ${currentYear} not found`);
    }


    deadlineDate.setDate(deadlineDate.getDate() + 1);


    while (true) {

        const month = deadlineDate.getMonth() + 1;
        const day = deadlineDate.getDate();


        // Get holidays for this month
        const holidays = await CalenderHoliday.findAll({
            where: {
                calender_id: calendar.calender_id,
                month: month,
                shouldConsiderAsHoliday: true
            }
        });


        const isWeekend =
            deadlineDate.getDay() === 0 ||
            deadlineDate.getDay() === 6;


        const holiday = holidays.find(
            h => h.day === day
        );


        const isHoliday =
            isWeekend || !!holiday;


        log(
            `${deadlineDate.toISOString().split("T")[0]} => Holiday: ${isHoliday}`
        );


        if (!isHoliday) {
            return deadlineDate;
        }


        // Move one more day
        deadlineDate.setDate(
            deadlineDate.getDate() + 1
        );
    }
};

module.exports = {
    calculateDeadline
};