/*
 * Decompiled with CFR 0.152.
 * 
 * Could not load the following classes:
 *  com.google.common.collect.AbstractIterator
 *  org.jspecify.annotations.Nullable
 */
package net.minecraft.world.level;

import com.google.common.collect.AbstractIterator;
import java.util.function.BiFunction;
import net.minecraft.core.BlockPos;
import net.minecraft.core.Cursor3D;
import net.minecraft.core.SectionPos;
import net.minecraft.util.Mth;
import net.minecraft.world.entity.Entity;
import net.minecraft.world.level.BlockGetter;
import net.minecraft.world.level.ChunkPos;
import net.minecraft.world.level.CollisionGetter;
import net.minecraft.world.level.block.Blocks;
import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.phys.AABB;
import net.minecraft.world.phys.shapes.BooleanOp;
import net.minecraft.world.phys.shapes.CollisionContext;
import net.minecraft.world.phys.shapes.Shapes;
import net.minecraft.world.phys.shapes.VoxelShape;
import org.jspecify.annotations.Nullable;

public class BlockCollisions<T>
extends AbstractIterator<T> {
    private final AABB box;
    private final CollisionContext context;
    private final Cursor3D cursor;
    private final BlockPos.MutableBlockPos pos;
    private final VoxelShape entityShape;
    private final CollisionGetter collisionGetter;
    private final boolean onlySuffocatingBlocks;
    private @Nullable BlockGetter cachedBlockGetter;
    private long cachedBlockGetterPos;
    private final BiFunction<BlockPos.MutableBlockPos, VoxelShape, T> resultProvider;

    public BlockCollisions(CollisionGetter collisionGetter, @Nullable Entity source, AABB box, boolean onlySuffocatingBlocks, BiFunction<BlockPos.MutableBlockPos, VoxelShape, T> resultProvider) {
        this(collisionGetter, source == null ? CollisionContext.empty() : CollisionContext.of(source), box, onlySuffocatingBlocks, resultProvider);
    }

    public BlockCollisions(CollisionGetter collisionGetter, CollisionContext context, AABB box, boolean onlySuffocatingBlocks, BiFunction<BlockPos.MutableBlockPos, VoxelShape, T> resultProvider) {
        this.context = context;
        this.pos = new BlockPos.MutableBlockPos();
        this.entityShape = Shapes.create(box);
        this.collisionGetter = collisionGetter;
        this.box = box;
        this.onlySuffocatingBlocks = onlySuffocatingBlocks;
        this.resultProvider = resultProvider;
        int x0 = Mth.floor(box.minX - 1.0E-7) - 1;
        int x1 = Mth.floor(box.maxX + 1.0E-7) + 1;
        int y0 = Mth.floor(box.minY - 1.0E-7) - 1;
        int y1 = Mth.floor(box.maxY + 1.0E-7) + 1;
        int z0 = Mth.floor(box.minZ - 1.0E-7) - 1;
        int z1 = Mth.floor(box.maxZ + 1.0E-7) + 1;
        this.cursor = new Cursor3D(x0, y0, z0, x1, y1, z1);
    }

    private @Nullable BlockGetter getChunk(int x, int z) {
        BlockGetter result;
        int chunkX = SectionPos.blockToSectionCoord(x);
        int chunkZ = SectionPos.blockToSectionCoord(z);
        long chunkPos = ChunkPos.asLong(chunkX, chunkZ);
        if (this.cachedBlockGetter != null && this.cachedBlockGetterPos == chunkPos) {
            return this.cachedBlockGetter;
        }
        this.cachedBlockGetter = result = this.collisionGetter.getChunkForCollisions(chunkX, chunkZ);
        this.cachedBlockGetterPos = chunkPos;
        return result;
    }

    protected T computeNext() {
        while (this.cursor.advance()) {
            BlockGetter chunk;
            int x = this.cursor.nextX();
            int y = this.cursor.nextY();
            int z = this.cursor.nextZ();
            int cursorFaceType = this.cursor.getNextType();
            if (cursorFaceType == 3 || (chunk = this.getChunk(x, z)) == null) continue;
            this.pos.set(x, y, z);
            BlockState blockState = chunk.getBlockState(this.pos);
            if (this.onlySuffocatingBlocks && !blockState.isSuffocating(chunk, this.pos) || cursorFaceType == 1 && !blockState.hasLargeCollisionShape() || cursorFaceType == 2 && !blockState.is(Blocks.MOVING_PISTON)) continue;
            VoxelShape blockShape = this.context.getCollisionShape(blockState, this.collisionGetter, this.pos);
            if (blockShape == Shapes.block()) {
                if (!this.box.intersects(x, y, z, (double)x + 1.0, (double)y + 1.0, (double)z + 1.0)) continue;
                return this.resultProvider.apply(this.pos, blockShape.move(this.pos));
            }
            VoxelShape shape = blockShape.move(this.pos);
            if (shape.isEmpty() || !Shapes.joinIsNotEmpty(shape, this.entityShape, BooleanOp.AND)) continue;
            return this.resultProvider.apply(this.pos, shape);
        }
        return (T)this.endOfData();
    }
}