package net.minecraft.world;

import javax.annotation.concurrent.Immutable;
import net.minecraft.util.Mth;

@Immutable
public class DifficultyInstance {
	private static final float DIFFICULTY_TIME_GLOBAL_OFFSET = -72000.0F;
	private static final float MAX_DIFFICULTY_TIME_GLOBAL = 1440000.0F;
	private static final float MAX_DIFFICULTY_TIME_LOCAL = 3600000.0F;
	private final Difficulty base;
	private final float effectiveDifficulty;

	public DifficultyInstance(final Difficulty base, final long totalGameTime, final long localGameTime, final float moonBrightness) {
		this.base = base;
		this.effectiveDifficulty = this.calculateDifficulty(base, totalGameTime, localGameTime, moonBrightness);
	}

	public Difficulty getDifficulty() {
		return this.base;
	}

	public float getEffectiveDifficulty() {
		return this.effectiveDifficulty;
	}

	public boolean isHard() {
		return this.effectiveDifficulty >= Difficulty.HARD.ordinal();
	}

	public boolean isHarderThan(final float requiredDifficulty) {
		return this.effectiveDifficulty > requiredDifficulty;
	}

	public float getSpecialMultiplier() {
		if (this.effectiveDifficulty < 2.0F) {
			return 0.0F;
		} else {
			return this.effectiveDifficulty > 4.0F ? 1.0F : (this.effectiveDifficulty - 2.0F) / 2.0F;
		}
	}

	private float calculateDifficulty(final Difficulty base, final long totalGameTime, final long localGameTime, final float moonBrightness) {
		if (base == Difficulty.PEACEFUL) {
			return 0.0F;
		} else {
			boolean isHard = base == Difficulty.HARD;
			float scale = 0.75F;
			float globalScale = Mth.clamp(((float)totalGameTime + -72000.0F) / 1440000.0F, 0.0F, 1.0F) * 0.25F;
			scale += globalScale;
			float localScale = 0.0F;
			localScale += Mth.clamp((float)localGameTime / 3600000.0F, 0.0F, 1.0F) * (isHard ? 1.0F : 0.75F);
			localScale += Mth.clamp(moonBrightness * 0.25F, 0.0F, globalScale);
			if (base == Difficulty.EASY) {
				localScale *= 0.5F;
			}

			scale += localScale;
			return base.getId() * scale;
		}
	}
}