backend/controller/dateAvailability.js

const { runSelectQuery } = require('../utils/queries');  // Assuming db.js handles DB queries
const {isHoliday} = require("../controller/holidays")
const { DateTime } = require('luxon');

async function checkDateAvailability(date) {
    const checkQuery = `SELECT COUNT(*) AS count FROM demo_requests WHERE demo_date = ?;`;
    const results = await runSelectQuery(checkQuery, [date]);

    return results.length === 0 || results[0].count < 11;
}

async function getAvailableDates(currentDate) {
    const availableDates = [];
    // Loop until we collect 14 available dates
    while (availableDates.length < 14) {
        // Check if the current date is a holiday in India
        const isHolidayResult = await isHoliday(currentDate.toFormat('yyyy-MM-dd')); // Pass as JS Date
        const isSundayResult = currentDate.weekday === 7; // Sunday in Luxon is 7
        const isSaturdayResult = currentDate.weekday === 6; // Saturday in Luxon is 6

        // Count which Saturday it is in the month
        let saturdayCount = 0;
        let tempDate = DateTime.local(currentDate.year, currentDate.month, 1);

        while (tempDate < currentDate) {
            if (tempDate.weekday === 6) { // If it's a Saturday
                saturdayCount++;
            }
            tempDate = tempDate.plus({ days: 1 });
        }

        const isFirstThirdOrFifthSaturday = isSaturdayResult && [0, 2, 4].includes(saturdayCount);

        // Check if the date is available
        const isAvailable = await checkDateAvailability(currentDate.toJSDate());

        // If it's not a holiday, not a Sunday, not a Saturday (if 1st, 3rd, or 5th Saturday), and it's available, add to available dates
        if (!isHolidayResult && !isSundayResult && !isFirstThirdOrFifthSaturday && isAvailable) {
            // Add the date in 'yyyy-MM-dd' format
            availableDates.push(currentDate.toFormat('yyyy-MM-dd'));
            console.log('Added date:', currentDate);
        } else {
            console.log('Date skipped:', currentDate.toISODate());
        }

        // Move to the next day (still in Asia/Kolkata timezone)
        currentDate = currentDate.plus({ days: 1 });
    }

    return availableDates;
  }

module.exports = { checkDateAvailability, getAvailableDates };