package net.minecraft.world.entity.ai.behavior;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import java.util.function.BiPredicate;
import java.util.function.Function;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Direction;
import net.minecraft.server.level.ServerLevel;
import net.minecraft.sounds.SoundEvent;
import net.minecraft.tags.TagKey;
import net.minecraft.util.valueproviders.UniformInt;
import net.minecraft.world.entity.Mob;
import net.minecraft.world.level.block.Block;

public class LongJumpToPreferredBlock<E extends Mob> extends LongJumpToRandomPos<E> {
	private final TagKey<Block> preferredBlockTag;
	private final float preferredBlocksChance;
	private final List<LongJumpToRandomPos.PossibleJump> notPrefferedJumpCandidates = new ArrayList();
	private boolean currentlyWantingPreferredOnes;

	public LongJumpToPreferredBlock(
		final UniformInt timeBetweenLongJumps,
		final int maxLongJumpHeight,
		final int maxLongJumpWidth,
		final float maxJumpVelocity,
		final Function<E, SoundEvent> getJumpSound,
		final TagKey<Block> preferredBlockTag,
		final float preferredBlocksChance,
		final BiPredicate<E, BlockPos> acceptableLandingSpot
	) {
		super(timeBetweenLongJumps, maxLongJumpHeight, maxLongJumpWidth, maxJumpVelocity, getJumpSound, acceptableLandingSpot);
		this.preferredBlockTag = preferredBlockTag;
		this.preferredBlocksChance = preferredBlocksChance;
	}

	@Override
	protected void start(final ServerLevel level, final E body, final long timestamp) {
		super.start(level, body, timestamp);
		this.notPrefferedJumpCandidates.clear();
		this.currentlyWantingPreferredOnes = body.getRandom().nextFloat() < this.preferredBlocksChance;
	}

	@Override
	protected Optional<LongJumpToRandomPos.PossibleJump> getJumpCandidate(final ServerLevel level) {
		if (!this.currentlyWantingPreferredOnes) {
			return super.getJumpCandidate(level);
		} else {
			BlockPos.MutableBlockPos testPos = new BlockPos.MutableBlockPos();

			while (!this.jumpCandidates.isEmpty()) {
				Optional<LongJumpToRandomPos.PossibleJump> jumpCandidate = super.getJumpCandidate(level);
				if (jumpCandidate.isPresent()) {
					LongJumpToRandomPos.PossibleJump possibleJump = (LongJumpToRandomPos.PossibleJump)jumpCandidate.get();
					if (level.getBlockState(testPos.setWithOffset(possibleJump.targetPos(), Direction.DOWN)).is(this.preferredBlockTag)) {
						return jumpCandidate;
					}

					this.notPrefferedJumpCandidates.add(possibleJump);
				}
			}

			return !this.notPrefferedJumpCandidates.isEmpty()
				? Optional.of((LongJumpToRandomPos.PossibleJump)this.notPrefferedJumpCandidates.remove(0))
				: Optional.empty();
		}
	}
}