Paper/src/main/java/net/minecraft/server/ItemInWorldManager.java

package net.minecraft.server;

// CraftBukkit start
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.craftbukkit.event.CraftEventFactory;
import org.bukkit.event.Event;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
// CraftBukkit end

public class ItemInWorldManager {

    public World world;
    public EntityPlayer player;
    private EnumGamemode gamemode;
    private boolean d;
    private int lastDigTick;
    private int f;
    private int g;
    private int h;
    private int currentTick;
    private boolean j;
    private int k;
    private int l;
    private int m;
    private int n;
    private int o;

    public ItemInWorldManager(World world) {
        this.gamemode = EnumGamemode.NONE;
        this.o = -1;
        this.world = world;
    }

    // CraftBukkit start - keep this for backwards compatibility
    public ItemInWorldManager(WorldServer world) {
        this((World) world);
    }
    // CraftBukkit end

    public void setGameMode(EnumGamemode enumgamemode) {
        this.gamemode = enumgamemode;
        enumgamemode.a(this.player.abilities);
        this.player.updateAbilities();
    }

    public EnumGamemode getGameMode() {
        return this.gamemode;
    }

    public boolean isCreative() {
        return this.gamemode.d();
    }

    public void b(EnumGamemode enumgamemode) {
        if (this.gamemode == EnumGamemode.NONE) {
            this.gamemode = enumgamemode;
        }

        this.setGameMode(this.gamemode);
    }

    public void a() {
        this.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit
        int i;
        float f;
        int j;

        if (this.j) {
            i = this.currentTick - this.n;
            int k = this.world.getTypeId(this.k, this.l, this.m);

            if (k == 0) {
                this.j = false;
            } else {
                Block block = Block.byId[k];

                f = block.getDamage(this.player, this.player.world, this.k, this.l, this.m) * (float) (i + 1);
                j = (int) (f * 10.0F);
                if (j != this.o) {
                    this.world.f(this.player.id, this.k, this.l, this.m, j);
                    this.o = j;
                }

                if (f >= 1.0F) {
                    this.j = false;
                    this.breakBlock(this.k, this.l, this.m);
                }
            }
        } else if (this.d) {
            i = this.world.getTypeId(this.f, this.g, this.h);
            Block block1 = Block.byId[i];

            if (block1 == null) {
                this.world.f(this.player.id, this.f, this.g, this.h, -1);
                this.o = -1;
                this.d = false;
            } else {
                int l = this.currentTick - this.lastDigTick;

                f = block1.getDamage(this.player, this.player.world, this.f, this.g, this.h) * (float) (l + 1);
                j = (int) (f * 10.0F);
                if (j != this.o) {
                    this.world.f(this.player.id, this.f, this.g, this.h, j);
                    this.o = j;
                }
            }
        }
    }

    public void dig(int i, int j, int k, int l) {
        // this.world.douseFire((EntityHuman) null, i, j, k, l); // CraftBukkit - moved down
        // CraftBukkit
        PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(this.player, Action.LEFT_CLICK_BLOCK, i, j, k, l, this.player.inventory.getItemInHand());

        if (!this.gamemode.isAdventure()) {
            // CraftBukkit start
            if (event.isCancelled()) {
                // Let the client know the block still exists
                ((EntityPlayer) this.player).netServerHandler.sendPacket(new Packet53BlockChange(i, j, k, this.world));
                return;
            }
            // CraftBukkit end
            if (this.isCreative()) {
                if (!this.world.douseFire((EntityHuman) null, i, j, k, l)) {
                    this.breakBlock(i, j, k);
                }
            } else {
                this.world.douseFire(this.player, i, j, k, l);
                this.lastDigTick = this.currentTick;
                float f = 1.0F;
                int i1 = this.world.getTypeId(i, j, k);
                // CraftBukkit start - Swings at air do *NOT* exist.
                if (i1 <= 0) {
                    return;
                }

                if (event.useInteractedBlock() == Event.Result.DENY) {
                    // If we denied a door from opening, we need to send a correcting update to the client, as it already opened the door.
                    if (i1 == Block.WOODEN_DOOR.id) {
                        // For some reason *BOTH* the bottom/top part have to be marked updated.
                        boolean bottom = (this.world.getData(i, j, k) & 8) == 0;
                        ((EntityPlayer) this.player).netServerHandler.sendPacket(new Packet53BlockChange(i, j, k, this.world));
                        ((EntityPlayer) this.player).netServerHandler.sendPacket(new Packet53BlockChange(i, j + (bottom ? 1 : -1), k, this.world));
                    } else if (i1 == Block.TRAP_DOOR.id) {
                        ((EntityPlayer) this.player).netServerHandler.sendPacket(new Packet53BlockChange(i, j, k, this.world));
                    }
                } else {
                    Block.byId[i1].attack(this.world, i, j, k, this.player);
                    // Allow fire punching to be blocked
                    this.world.douseFire((EntityHuman) null, i, j, k, l);
                }

                // Handle hitting a block
                float toolDamage = Block.byId[i1].getDamage(this.player, this.world, i, j, k);
                if (event.useItemInHand() == Event.Result.DENY) {
                    // If we 'insta destroyed' then the client needs to be informed.
                    if (toolDamage > 1.0f) {
                        ((EntityPlayer) this.player).netServerHandler.sendPacket(new Packet53BlockChange(i, j, k, this.world));
                    }
                    return;
                }
                org.bukkit.event.block.BlockDamageEvent blockEvent = CraftEventFactory.callBlockDamageEvent(this.player, i, j, k, this.player.inventory.getItemInHand(), toolDamage >= 1.0f);

                if (blockEvent.isCancelled()) {
                    // Let the client know the block still exists
                    ((EntityPlayer) this.player).netServerHandler.sendPacket(new Packet53BlockChange(i, j, k, this.world));
                    return;
                }

                if (blockEvent.getInstaBreak()) {
                    toolDamage = 2.0f;
                }

                if (toolDamage >= 1.0F) {
                    // CraftBukkit end
                    this.breakBlock(i, j, k);
                } else {
                    this.d = true;
                    this.f = i;
                    this.g = j;
                    this.h = k;
                    int j1 = (int) (f * 10.0F);

                    this.world.f(this.player.id, i, j, k, j1);
                    this.o = j1;
                }
            }
        }
    }

    public void a(int i, int j, int k) {
        if (i == this.f && j == this.g && k == this.h) {
            this.currentTick = (int) (System.currentTimeMillis() / 50); // CraftBukkit
            int l = this.currentTick - this.lastDigTick;
            int i1 = this.world.getTypeId(i, j, k);

            if (i1 != 0) {
                Block block = Block.byId[i1];
                float f = block.getDamage(this.player, this.player.world, i, j, k) * (float) (l + 1);

                if (f >= 0.7F) {
                    this.d = false;
                    this.world.f(this.player.id, i, j, k, -1);
                    this.breakBlock(i, j, k);
                } else if (!this.j) {
                    this.d = false;
                    this.j = true;
                    this.k = i;
                    this.l = j;
                    this.m = k;
                    this.n = this.lastDigTick;
                }
            }
        // CraftBukkit start - force blockreset to client
        } else {
            ((EntityPlayer) this.player).netServerHandler.sendPacket(new Packet53BlockChange(i, j, k, this.world));
            // CraftBukkit end
        }
    }

    public void c(int i, int j, int k) {
        this.d = false;
        this.world.f(this.player.id, this.f, this.g, this.h, -1);
    }

    private boolean d(int i, int j, int k) {
        Block block = Block.byId[this.world.getTypeId(i, j, k)];
        int l = this.world.getData(i, j, k);

        if (block != null) {
            block.a(this.world, i, j, k, l, this.player);
        }

        boolean flag = this.world.setTypeId(i, j, k, 0);

        if (block != null && flag) {
            block.postBreak(this.world, i, j, k, l);
        }

        return flag;
    }

    public boolean breakBlock(int i, int j, int k) {
        // CraftBukkit start
        BlockBreakEvent event = null;

        if (this.player instanceof EntityPlayer) {
            org.bukkit.block.Block block = this.world.getWorld().getBlockAt(i, j, k);

            // Tell client the block is gone immediately then process events
            if (world.getTileEntity(i, j, k) == null) {
                Packet53BlockChange packet = new Packet53BlockChange(i, j, k, this.world);

                packet.material = 0;
                packet.data = 0;
                ((EntityPlayer) this.player).netServerHandler.sendPacket(packet);
            }

            event = new BlockBreakEvent(block, this.player.getBukkitEntity());

            // Adventure mode pre-cancel
            event.setCancelled(this.gamemode.isAdventure());

            // Calculate default block experience
            Block nmsBlock = Block.byId[block.getTypeId()];

            if (nmsBlock != null && !event.isCancelled() && !this.isCreative() && this.player.b(nmsBlock)) {
                // Copied from Block.a(world, entityhuman, int, int, int, int)
                if (!(nmsBlock.q_() && EnchantmentManager.hasSilkTouchEnchantment(this.player.inventory))) {
                    int data = block.getData();
                    int bonusLevel = EnchantmentManager.getBonusBlockLootEnchantmentLevel(this.player.inventory);

                    event.setExpToDrop(nmsBlock.getExpDrop(this.world, data, bonusLevel));
                }
            }

            this.world.getServer().getPluginManager().callEvent(event);

            if (event.isCancelled()) {
                // Let the client know the block still exists
                ((EntityPlayer) this.player).netServerHandler.sendPacket(new Packet53BlockChange(i, j, k, this.world));
                return false;
            }
        }

        if (false) { // Never trigger
            // CraftBukkit end
            return false;
        } else {
            int l = this.world.getTypeId(i, j, k);
            if (Block.byId[l] == null) return false; // CraftBukkit - a plugin set block to air without cancelling
            int i1 = this.world.getData(i, j, k);

            this.world.a(this.player, 2001, i, j, k, l + (this.world.getData(i, j, k) << 12));
            boolean flag = this.d(i, j, k);

            if (this.isCreative()) {
                this.player.netServerHandler.sendPacket(new Packet53BlockChange(i, j, k, this.world));
            } else {
                ItemStack itemstack = this.player.bC();
                boolean flag1 = this.player.b(Block.byId[l]);

                if (itemstack != null) {
                    itemstack.a(this.world, l, i, j, k, this.player);
                    if (itemstack.count == 0) {
                        this.player.bD();
                    }
                }

                if (flag && flag1) {
                    Block.byId[l].a(this.world, this.player, i, j, k, i1);
                }
            }

            // CraftBukkit start - drop event experience
            if (flag && event != null) {
                Block.byId[l].g(this.world, i, j, k, event.getExpToDrop());
            }
            // CraftBukkit end

            return flag;
        }
    }

    public boolean useItem(EntityHuman entityhuman, World world, ItemStack itemstack) {
        int i = itemstack.count;
        int j = itemstack.getData();
        ItemStack itemstack1 = itemstack.a(world, entityhuman);

        if (itemstack1 == itemstack && (itemstack1 == null || itemstack1.count == i) && (itemstack1 == null || itemstack1.m() <= 0)) {
            return false;
        } else {
            entityhuman.inventory.items[entityhuman.inventory.itemInHandIndex] = itemstack1;
            if (this.isCreative()) {
                itemstack1.count = i;
                itemstack1.setData(j);
            }

            if (itemstack1.count == 0) {
                entityhuman.inventory.items[entityhuman.inventory.itemInHandIndex] = null;
            }

            return true;
        }
    }

    // CraftBukkit - TODO: Review this code, it changed in 1.8 but I'm not sure if we need to update or not
    public boolean interact(EntityHuman entityhuman, World world, ItemStack itemstack, int i, int j, int k, int l, float f, float f1, float f2) {
        int i1 = world.getTypeId(i, j, k);

        // CraftBukkit start - Interact
        boolean result = false;
        if (i1 > 0) {
            PlayerInteractEvent event = CraftEventFactory.callPlayerInteractEvent(entityhuman, Action.RIGHT_CLICK_BLOCK, i, j, k, l, itemstack);
            if (event.useInteractedBlock() == Event.Result.DENY) {
                // If we denied a door from opening, we need to send a correcting update to the client, as it already opened the door.
                if (i1 == Block.WOODEN_DOOR.id) {
                    boolean bottom = (world.getData(i, j, k) & 8) == 0;
                    ((EntityPlayer) entityhuman).netServerHandler.sendPacket(new Packet53BlockChange(i, j + (bottom ? 1 : -1), k, world));
                }
                result = (event.useItemInHand() != Event.Result.ALLOW);
            } else {
                result = Block.byId[i1].interact(world, i, j, k, entityhuman, l, f, f1, f2);
            }

            if (itemstack != null && !result) {
                int j1 = itemstack.getData();
                int k1 = itemstack.count;

                result = itemstack.placeItem(entityhuman, world, i, j, k, l, f, f1, f2);

                // The item count should not decrement in Creative mode.
                if (this.isCreative()) {
                    itemstack.setData(j1);
                    itemstack.count = k1;
                }
            }

            // If we have 'true' and no explicit deny *or* an explicit allow -- run the item part of the hook
            if (itemstack != null && ((!result && event.useItemInHand() != Event.Result.DENY) || event.useItemInHand() == Event.Result.ALLOW)) {
                this.useItem(entityhuman, world, itemstack);
            }
        }
        return result;
        // CraftBukkit end
    }

    public void a(WorldServer worldserver) {
        this.world = worldserver;
    }
}