/**
 * Copyright (c) 2011-2015, SpaceToad and the BuildCraft Team
 * http://www.mod-buildcraft.com
 *
 * The BuildCraft API is distributed under the terms of the MIT License.
 * Please check the contents of the license, which should be located
 * as "LICENSE.API" in the BuildCraft source code distribution.
 */
package buildcraft.api.core;

import net.minecraft.world.World;

public class SafeTimeTracker {

	private long lastMark = Long.MIN_VALUE;
	private long duration = -1;
	private long randomRange = 0;
	private long lastRandomDelay = 0;
	private long internalDelay = 1;

	/**
	 * @deprecated should use constructors with parameters instead
	 */
	public SafeTimeTracker () {

	}

	public SafeTimeTracker (long delay) {
		internalDelay = delay;
	}

	/**
	 * In many situations, it is a bad idea to have all objects of the same
	 * kind to be waiting for the exact same amount of time, as that can lead
	 * to some situation where they're all synchronized and got to work all
	 * at the same time. When created with a random range, the mark that is set
	 * when reaching the expect delay will be added with a random number
	 * between [0, range[, meaning that the event will take between 0 and range
	 * more tick to run.
	 */
	public SafeTimeTracker (long delay, long random) {
		internalDelay = delay;
		randomRange = random;
	}

	public boolean markTimeIfDelay(World world) {
		return markTimeIfDelay(world, internalDelay);
	}

	/**
	 * Return true if a given delay has passed since last time marked was called
	 * successfully.
	 *
	 * @deprecated should use the constructor with a delay instead, and call
	 * this function without a parameter
	 */
	public boolean markTimeIfDelay(World world, long delay) {
		if (world == null) {
			return false;
		}

		long currentTime = world.getTotalWorldTime();

		if (currentTime < lastMark) {
			lastMark = currentTime;
			return false;
		} else if (lastMark + delay + lastRandomDelay <= currentTime) {
			duration = currentTime - lastMark;
			lastMark = currentTime;
			lastRandomDelay = (int) (Math.random() * randomRange);

			return true;
		} else {
			return false;
		}
	}

	public long durationOfLastDelay() {
		return duration > 0 ? duration : 0;
	}

	public void markTime(World world) {
		lastMark = world.getTotalWorldTime();
	}
}