Brewery/src/com/dre/brewery/BCauldron.java

package com.dre.brewery;

import com.dre.brewery.api.events.IngedientAddEvent;
import org.bukkit.Effect;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.block.BlockFace;
import org.bukkit.block.data.BlockData;
import org.bukkit.block.data.Levelled;
import org.bukkit.configuration.ConfigurationSection;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;

import java.util.concurrent.CopyOnWriteArrayList;

public class BCauldron {
	public static final byte EMPTY = 0, SOME = 1, FULL = 2;
	public static CopyOnWriteArrayList<BCauldron> bcauldrons = new CopyOnWriteArrayList<>(); // TODO find best Collection

	private BIngredients ingredients = new BIngredients();
	private final Block block;
	private int state = 1;
	private boolean someRemoved = false;

	public BCauldron(Block block) {
		this.block = block;
		bcauldrons.add(this);
	}

	// loading from file
	public BCauldron(Block block, BIngredients ingredients, int state) {
		this.block = block;
		this.state = state;
		this.ingredients = ingredients;
		bcauldrons.add(this);
	}

	public void onUpdate() {
		// Check if fire still alive
		if (!BUtil.isChunkLoaded(block) || LegacyUtil.isFireForCauldron(block.getRelative(BlockFace.DOWN))) {
			// add a minute to cooking time
			state++;
			if (someRemoved) {
				ingredients = ingredients.clone();
				someRemoved = false;
			}
		}
	}

	// add an ingredient to the cauldron
	public void add(ItemStack ingredient) {
		if (ingredient == null || ingredient.getType() == Material.AIR) return;
		if (someRemoved) { // TODO no need to clone
			ingredients = ingredients.clone();
			someRemoved = false;
		}
		ingredient = new ItemStack(ingredient.getType(), 1, ingredient.getDurability());
		ingredients.add(ingredient);
		block.getWorld().playEffect(block.getLocation(), Effect.EXTINGUISH, 0);
		if (state > 1) {
			state--;
		}
	}

	// get cauldron by Block
	public static BCauldron get(Block block) {
		for (BCauldron bcauldron : bcauldrons) {
			if (bcauldron.block.equals(block)) {
				return bcauldron;
			}
		}
		return null;
	}

	// get cauldron from block and add given ingredient
	// Calls the IngredientAddEvent and may be cancelled or changed
	public static boolean ingredientAdd(Block block, ItemStack ingredient, Player player) {
		// if not empty
		if (LegacyUtil.getFillLevel(block) != EMPTY) {
			BCauldron bcauldron = get(block);
			if (bcauldron == null) {
				bcauldron = new BCauldron(block);
			}

			IngedientAddEvent event = new IngedientAddEvent(player, block, bcauldron, ingredient);
			P.p.getServer().getPluginManager().callEvent(event);
			if (!event.isCancelled()) {
				bcauldron.add(event.getIngredient());
				return event.willTakeItem();
			} else {
				return false;
			}
		}
		return false;
	}

	// fills players bottle with cooked brew
	public static boolean fill(Player player, Block block) {
		BCauldron bcauldron = get(block);
		if (bcauldron != null) {
			if (!player.hasPermission("brewery.cauldron.fill")) {
				P.p.msg(player, P.p.languageReader.get("Perms_NoCauldronFill"));
				return true;
			}
			ItemStack potion = bcauldron.ingredients.cook(bcauldron.state);
			if (potion != null) {

				if (P.use1_13) {
					BlockData data = block.getBlockData();
					Levelled cauldron = ((Levelled) data);
					if (cauldron.getLevel() <= 0) {
						bcauldrons.remove(bcauldron);
						return false;
					}
					cauldron.setLevel(cauldron.getLevel() - 1);
					// Update the new Level to the Block
					// We have to use the BlockData variable "data" here instead of the casted "cauldron"
					// otherwise < 1.13 crashes on plugin load for not finding the BlockData Class
					block.setBlockData(data);

					if (cauldron.getLevel() <= 0) {
						bcauldrons.remove(bcauldron);
					} else {
						bcauldron.someRemoved = true;
					}

				} else {
					byte data = block.getData();
					if (data > 3) {
						data = 3;
					} else if (data <= 0) {
						bcauldrons.remove(bcauldron);
						return false;
					}
					data -= 1;
					LegacyUtil.setData(block, data);

					if (data == 0) {
						bcauldrons.remove(bcauldron);
					} else {
						bcauldron.someRemoved = true;
					}
				}
				// Bukkit Bug, inventory not updating while in event so this
				// will delay the give
				// but could also just use deprecated updateInventory()
				giveItem(player, potion);
				// player.getInventory().addItem(potion);
				// player.getInventory().updateInventory();
				return true;
			}
		}
		return false;
	}

	// prints the current cooking time to the player
	public static void printTime(Player player, Block block) {
		if (!player.hasPermission("brewery.cauldron.time")) {
			P.p.msg(player, P.p.languageReader.get("Error_NoPermissions"));
			return;
		}
		BCauldron bcauldron = get(block);
		if (bcauldron != null) {
			if (bcauldron.state > 1) {
				P.p.msg(player, P.p.languageReader.get("Player_CauldronInfo1", "" + bcauldron.state));
			} else {
				P.p.msg(player, P.p.languageReader.get("Player_CauldronInfo2"));
			}
		}
	}

	// reset to normal cauldron
	public static boolean remove(Block block) {
		if (LegacyUtil.getFillLevel(block) != EMPTY) {
			BCauldron bcauldron = get(block);
			if (bcauldron != null) {
				bcauldrons.remove(bcauldron);
				return true;
			}
		}
		return false;
	}

	// unloads cauldrons that are in a unloading world
	// as they were written to file just before, this is safe to do
	public static void onUnload(String name) {
		for (BCauldron bcauldron : bcauldrons) {
			if (bcauldron.block.getWorld().getName().equals(name)) {
				bcauldrons.remove(bcauldron);
			}
		}
	}

	public static void save(ConfigurationSection config, ConfigurationSection oldData) {
		BUtil.createWorldSections(config);

		if (!bcauldrons.isEmpty()) {
			int id = 0;
			for (BCauldron cauldron : bcauldrons) {
				String worldName = cauldron.block.getWorld().getName();
				String prefix;

				if (worldName.startsWith("DXL_")) {
					prefix = BUtil.getDxlName(worldName) + "." + id;
				} else {
					prefix = cauldron.block.getWorld().getUID().toString() + "." + id;
				}

				config.set(prefix + ".block", cauldron.block.getX() + "/" + cauldron.block.getY() + "/" + cauldron.block.getZ());
				if (cauldron.state != 1) {
					config.set(prefix + ".state", cauldron.state);
				}
				config.set(prefix + ".ingredients", cauldron.ingredients.serializeIngredients());
				id++;
			}
		}
		// copy cauldrons that are not loaded
		if (oldData != null){
			for (String uuid : oldData.getKeys(false)) {
				if (!config.contains(uuid)) {
					config.set(uuid, oldData.get(uuid));
				}
			}
		}
	}

	// bukkit bug not updating the inventory while executing event, have to
	// schedule the give
	public static void giveItem(final Player player, final ItemStack item) {
		P.p.getServer().getScheduler().runTaskLater(P.p, new Runnable() {
			public void run() {
				player.getInventory().addItem(item);
			}
		}, 1L);
	}

}