package net.minecraft.server;

import java.util.Iterator;
import javax.annotation.Nullable;

// CraftBukkit start
import org.bukkit.craftbukkit.util.BlockStateListPopulator;
import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
// CraftBukkit end

public class BlockWitherSkull extends BlockSkull {

    @Nullable
    private static ShapeDetector c;
    @Nullable
    private static ShapeDetector d;

    protected BlockWitherSkull(Block.Info block_info) {
        super(BlockSkull.Type.WITHER_SKELETON, block_info);
    }

    @Override
    public void postPlace(World world, BlockPosition blockposition, IBlockData iblockdata, @Nullable EntityLiving entityliving, ItemStack itemstack) {
        super.postPlace(world, blockposition, iblockdata, entityliving, itemstack);
        TileEntity tileentity = world.getTileEntity(blockposition);

        if (tileentity instanceof TileEntitySkull) {
            a(world, blockposition, (TileEntitySkull) tileentity);
        }

    }

    public static void a(World world, BlockPosition blockposition, TileEntitySkull tileentityskull) {
        if (world.captureBlockStates) return; // CraftBukkit
        if (!world.isClientSide) {
            Block block = tileentityskull.getBlock().getBlock();
            boolean flag = block == Blocks.WITHER_SKELETON_SKULL || block == Blocks.WITHER_SKELETON_WALL_SKULL;

            if (flag && blockposition.getY() >= 2 && world.getDifficulty() != EnumDifficulty.PEACEFUL) {
                ShapeDetector shapedetector = c();
                ShapeDetector.ShapeDetectorCollection shapedetector_shapedetectorcollection = shapedetector.a(world, blockposition);

                if (shapedetector_shapedetectorcollection != null) {
                    // CraftBukkit start - Use BlockStateListPopulator
                    BlockStateListPopulator blockList = new BlockStateListPopulator(world);
                    for (int i = 0; i < shapedetector.c(); ++i) {
                        for (int j = 0; j < shapedetector.b(); ++j) {
                            ShapeDetectorBlock shapedetectorblock = shapedetector_shapedetectorcollection.a(i, j, 0);

                            blockList.setTypeAndData(shapedetectorblock.getPosition(), Blocks.AIR.getBlockData(), 2); // CraftBukkit
                            // world.triggerEffect(2001, shapedetectorblock.getPosition(), Block.getCombinedId(shapedetectorblock.a())); // CraftBukkit
                        }
                    }

                    EntityWither entitywither = (EntityWither) EntityTypes.WITHER.a(world);
                    BlockPosition blockposition1 = shapedetector_shapedetectorcollection.a(1, 2, 0).getPosition();

                    entitywither.setPositionRotation((double) blockposition1.getX() + 0.5D, (double) blockposition1.getY() + 0.55D, (double) blockposition1.getZ() + 0.5D, shapedetector_shapedetectorcollection.getFacing().m() == EnumDirection.EnumAxis.X ? 0.0F : 90.0F, 0.0F);
                    entitywither.aI = shapedetector_shapedetectorcollection.getFacing().m() == EnumDirection.EnumAxis.X ? 0.0F : 90.0F;
                    entitywither.l();
                    // CraftBukkit start
                    if (!world.addEntity(entitywither, SpawnReason.BUILD_WITHER)) {
                        return;
                    }
                    for (BlockPosition pos : blockList.getBlocks()) {
                        world.triggerEffect(2001, pos, Block.getCombinedId(world.getType(pos)));
                    }
                    blockList.updateList();
                    // CraftBukkit end
                    Iterator iterator = world.a(EntityPlayer.class, entitywither.getBoundingBox().g(50.0D)).iterator();

                    while (iterator.hasNext()) {
                        EntityPlayer entityplayer = (EntityPlayer) iterator.next();

                        CriterionTriggers.n.a(entityplayer, (Entity) entitywither);
                    }

                    // world.addEntity(entitywither); // CraftBukkit - moved up

                    for (int k = 0; k < shapedetector.c(); ++k) {
                        for (int l = 0; l < shapedetector.b(); ++l) {
                            world.update(shapedetector_shapedetectorcollection.a(k, l, 0).getPosition(), Blocks.AIR);
                        }
                    }

                }
            }
        }
    }

    public static boolean b(World world, BlockPosition blockposition, ItemStack itemstack) {
        return itemstack.getItem() == Items.WITHER_SKELETON_SKULL && blockposition.getY() >= 2 && world.getDifficulty() != EnumDifficulty.PEACEFUL && !world.isClientSide ? d().a(world, blockposition) != null : false;
    }

    private static ShapeDetector c() {
        if (BlockWitherSkull.c == null) {
            BlockWitherSkull.c = ShapeDetectorBuilder.a().a("^^^", "###", "~#~").a('#', ShapeDetectorBlock.a(BlockStatePredicate.a(Blocks.SOUL_SAND))).a('^', ShapeDetectorBlock.a(BlockStatePredicate.a(Blocks.WITHER_SKELETON_SKULL).or(BlockStatePredicate.a(Blocks.WITHER_SKELETON_WALL_SKULL)))).a('~', ShapeDetectorBlock.a(MaterialPredicate.a(Material.AIR))).b();
        }

        return BlockWitherSkull.c;
    }

    private static ShapeDetector d() {
        if (BlockWitherSkull.d == null) {
            BlockWitherSkull.d = ShapeDetectorBuilder.a().a("   ", "###", "~#~").a('#', ShapeDetectorBlock.a(BlockStatePredicate.a(Blocks.SOUL_SAND))).a('~', ShapeDetectorBlock.a(MaterialPredicate.a(Material.AIR))).b();
        }

        return BlockWitherSkull.d;
    }
}