package com.lincfusion.udyamlinc.ingestion;

import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.WeekFields;

/**
 * Everything upstream reports daily; everything downstream reads weekly. One
 * definition of "week" for both signal tables, so a mandi price and a rainfall
 * figure for the same period actually line up.
 */
public final class Weeks {

    private Weeks() {}

    /** Monday of the ISO week the date falls in. */
    public static LocalDate startOf(LocalDate date) {
        return date.with(DayOfWeek.MONDAY);
    }

    /** ISO week number, 1–53. */
    public static int isoWeek(LocalDate date) {
        return date.get(WeekFields.ISO.weekOfWeekBasedYear());
    }

    /** ISO week-based year — not always the calendar year at a year boundary. */
    public static int isoYear(LocalDate date) {
        return date.get(WeekFields.ISO.weekBasedYear());
    }
}