package net.minecraft.world;

import net.minecraft.util.Mth;
import org.jetbrains.annotations.Unmodifiable;

@Unmodifiable
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(Difficulty base, long levelTime, long chunkInhabitedTime, float moonPhaseFactor) {
		this.base = base;
		this.effectiveDifficulty = this.calculateDifficulty(base, levelTime, chunkInhabitedTime, moonPhaseFactor);
	}

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

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

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

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

	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(Difficulty difficulty, long levelTime, long chunkInhabitedTime, float moonPhaseFactor) {
		if (difficulty == Difficulty.PEACEFUL) {
			return 0.0F;
		} else {
			boolean bl = difficulty == Difficulty.HARD;
			float f = 0.75F;
			float g = Mth.clamp(((float)levelTime + -72000.0F) / 1440000.0F, 0.0F, 1.0F) * 0.25F;
			f += g;
			float h = 0.0F;
			h += Mth.clamp((float)chunkInhabitedTime / 3600000.0F, 0.0F, 1.0F) * (bl ? 1.0F : 0.75F);
			h += Mth.clamp(moonPhaseFactor * 0.25F, 0.0F, g);
			if (difficulty == Difficulty.EASY) {
				h *= 0.5F;
			}

			f += h;
			return difficulty.getId() * f;
		}
	}
}