package net.minecraft.client.renderer;

import net.minecraft.util.Mth;
import net.minecraft.util.RandomSource;

public class EndFlashState {
	public static final int SOUND_DELAY_IN_TICKS = 30;
	private static final int FLASH_INTERVAL_IN_TICKS = 600;
	private static final int MAX_FLASH_OFFSET_IN_TICKS = 200;
	private static final int MIN_FLASH_DURATION_IN_TICKS = 100;
	private static final int MAX_FLASH_DURATION_IN_TICKS = 380;
	private long flashSeed;
	private int offset;
	private int duration;
	private float intensity;
	private float oldIntensity;
	private float xAngle;
	private float yAngle;

	public void tick(final long clockTime) {
		this.calculateFlashParameters(clockTime);
		this.oldIntensity = this.intensity;
		this.intensity = this.calculateIntensity(clockTime);
	}

	private void calculateFlashParameters(final long clockTime) {
		long newSeed = clockTime / 600L;
		if (newSeed != this.flashSeed) {
			RandomSource randomSource = RandomSource.createThreadLocalInstance(newSeed);
			randomSource.nextFloat();
			this.offset = Mth.randomBetweenInclusive(randomSource, 0, 200);
			this.duration = Mth.randomBetweenInclusive(randomSource, 100, Math.min(380, 600 - this.offset));
			this.xAngle = Mth.randomBetween(randomSource, -60.0F, 10.0F);
			this.yAngle = Mth.randomBetween(randomSource, -180.0F, 180.0F);
			this.flashSeed = newSeed;
		}
	}

	private float calculateIntensity(final long clockTime) {
		long clockTimeWithinInterval = clockTime % 600L;
		return clockTimeWithinInterval >= this.offset && clockTimeWithinInterval <= this.offset + this.duration
			? Mth.sin((float)(clockTimeWithinInterval - this.offset) * (float) Math.PI / this.duration)
			: 0.0F;
	}

	public float getXAngle() {
		return this.xAngle;
	}

	public float getYAngle() {
		return this.yAngle;
	}

	public float getIntensity(final float partialTicks) {
		return Mth.lerp(partialTicks, this.oldIntensity, this.intensity);
	}

	public boolean flashStartedThisTick() {
		return this.intensity > 0.0F && this.oldIntensity <= 0.0F;
	}
}