🚀 Add anvil repair cost expression (SkriptLang#4617)

src/main/java/ch/njol/skript/expressions/ExprAnvilRepairCost.java

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+/**
+ *   This file is part of Skript.
+ *
+ *  Skript is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Skript is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Skript.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright Peter Güttinger, SkriptLang team and contributors
+ */
+package ch.njol.skript.expressions;
+
+import ch.njol.skript.Skript;
+import ch.njol.skript.classes.Changer.ChangeMode;
+import ch.njol.skript.doc.Description;
+import ch.njol.skript.doc.Examples;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.expressions.base.SimplePropertyExpression;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.ExpressionType;
+import ch.njol.skript.lang.SkriptParser.ParseResult;
+import ch.njol.util.Kleenean;
+import ch.njol.util.coll.CollectionUtils;
+import org.bukkit.event.Event;
+import org.bukkit.inventory.AnvilInventory;
+import org.bukkit.inventory.Inventory;
+import org.eclipse.jdt.annotation.Nullable;
+
+@Name("Anvil Repair Cost")
+@Description({
+	"Returns the experience cost (in levels) to complete the current repair or the maximum experience cost (in levels) to be allowed by the current repair.",
+	"The default value of max cost set by vanilla Minecraft is 40."
+})
+@Examples({
+	"on inventory click:",
+		"\tif {AnvilRepairSaleActive} = true:",
+		"\t\twait a tick # recommended, to avoid client bugs",
+		"\t\tset anvil repair cost to anvil repair cost * 50%",
+		"\t\tsend \"Anvil repair sale is ON!\" to player",
+	"",
+	"on inventory click:",
+		"\tplayer have permission \"anvil.repair.max.bypass\"",
+		"\tset max repair cost of event-inventory to 99999"
+})
+@Since("INSERT VERSION")
+public class ExprAnvilRepairCost extends SimplePropertyExpression<Inventory, Integer> {
+
+	static {
+		registerDefault(ExprAnvilRepairCost.class, Integer.class, "[anvil] [item] [:max[imum]] repair cost", "inventories");
+	}
+
+	private boolean isMax;
+
+	@Override
+	public boolean init(Expression<?>[] exprs, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
+		isMax = parseResult.hasTag("max");
+		return super.init(exprs, matchedPattern, isDelayed, parseResult);
+	}
+
+	@Override
+	@Nullable
+	public Integer convert(Inventory inventory) {
+		if (!(inventory instanceof AnvilInventory))
+			return null;
+
+		AnvilInventory anvilInventory = (AnvilInventory) inventory;
+		return isMax ? anvilInventory.getMaximumRepairCost() : anvilInventory.getRepairCost();
+	}
+
+	@Override
+	@Nullable
+	public Class<?>[] acceptChange(ChangeMode mode) {
+		switch (mode) {
+			case ADD:
+			case REMOVE:
+			case SET:
+				return CollectionUtils.array(Number.class);
+			default:
+				return null;
+		}
+	}
+
+	@Override
+	public void change(Event event, @Nullable Object[] delta, ChangeMode mode) {
+		int value = ((Number) delta[0]).intValue() * (mode == ChangeMode.REMOVE ? -1 : 1);
+		for (Inventory inventory : getExpr().getArray(event)) {
+			if (inventory instanceof AnvilInventory) {
+				AnvilInventory anvilInventory = (AnvilInventory) inventory;
+				int change = mode == ChangeMode.SET ? 0 : (isMax ? anvilInventory.getMaximumRepairCost() : anvilInventory.getRepairCost());
+				int newValue = Math.max((change + value), 0);
+
+				if (isMax)
+					anvilInventory.setMaximumRepairCost(newValue);
+				else
+					anvilInventory.setRepairCost(newValue);
+			}
+		}
+	}
+
+	@Override
+	public Class<? extends Integer> getReturnType() {
+		return Integer.class;
+	}
+
+	@Override
+	public String getPropertyName() {
+		return "anvil item" + (isMax ? " max" : "") + " repair cost";
+	}
+
+}