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package io.github.icodegarden.nutrient.lang.util;

import java.time.Duration;
import java.time.LocalDateTime;

import org.springframework.scheduling.support.CronExpression;

import io.github.icodegarden.nutrient.lang.annotation.Nullable;

/**
 * 
 * @author Fangfang.Xu
 *
 */
public abstract class CronUtils {

	public static boolean isValid(@Nullable String cron) {
		return CronExpression.isValidExpression(cron);
	}

	/**
	 * 得出下次 - 下下次 之间的时间差
	 * 
	 * @param cron
	 * @return
	 */
	public static long betweenMillis(String cron) {
		CronExpression cronExpression = CronExpression.parse(cron);
		LocalDateTime now = SystemUtils.now();
		LocalDateTime next = cronExpression.next(now);
		LocalDateTime next_next = cronExpression.next(next);
		Duration between = Duration.between(next, next_next);
		return between.toMillis();
	}

	/**
	 * 计算出距离下次执行的延迟毫秒
	 * 
	 * @param cron
	 * @return
	 */
	public static long nextDelayMillis(String cron) {
		LocalDateTime now = SystemUtils.now();
		LocalDateTime next = next(cron);
		Duration between = Duration.between(now, next);
		return between.toMillis();
	}
	
	/**
	 * 下次的执行时间
	 * @param cron
	 * @return
	 */
	public static LocalDateTime next(String cron) {
		CronExpression cronExpression = CronExpression.parse(cron);
		LocalDateTime now = SystemUtils.now();
		return cronExpression.next(now);
	}
}