package com.test.payment.models;

import java.time.LocalDateTime;

/**
 * The window a provider limit applies over. PER_TRANSACTION checks the request
 * amount on its own; the others sum the payer's prior payments over the window.
 * Adding a new period (WEEKLY, YEARLY, ...) only means adding a constant here —
 * PaymentLimitService iterates whatever rows exist in PROVIDER_LIMITS.
 */
public enum LimitPeriod {

    PER_TRANSACTION {
        @Override
        public LocalDateTime windowStart(LocalDateTime now) {
            return null;
        }
    },
    DAILY {
        @Override
        public LocalDateTime windowStart(LocalDateTime now) {
            return now.toLocalDate().atStartOfDay();
        }
    },
    MONTHLY {
        @Override
        public LocalDateTime windowStart(LocalDateTime now) {
            return now.toLocalDate().withDayOfMonth(1).atStartOfDay();
        }
    };

    /**
     * Start of the accumulation window, or null when the limit applies to a single
     * transaction rather than to a running total.
     */
    public abstract LocalDateTime windowStart(LocalDateTime now);

    public boolean isCumulative() {
        return this != PER_TRANSACTION;
    }
}