AlchemyRecipe.java

package com.yanis48.minalchemy.recipe;

import com.yanis48.minalchemy.init.MinalchemyBlocks;
import com.yanis48.minalchemy.init.MinalchemyRecipes;

import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.inventory.Inventory;
import net.minecraft.item.ItemStack;
import net.minecraft.recipe.Ingredient;
import net.minecraft.recipe.Recipe;
import net.minecraft.recipe.RecipeFinder;
import net.minecraft.recipe.RecipeSerializer;
import net.minecraft.recipe.RecipeType;
import net.minecraft.util.DefaultedList;
import net.minecraft.util.Identifier;
import net.minecraft.world.World;

public class AlchemyRecipe implements Recipe<Inventory> {
	private final Identifier id;
	private final String group;
	private final ItemStack output;
	protected final DefaultedList<Ingredient> ingredients;
	
	public AlchemyRecipe(Identifier id, String group, ItemStack output, DefaultedList<Ingredient> ingredients) {
		this.id = id;
		this.group = group;
		this.output = output;
		this.ingredients = ingredients;
	}

	@Override
	public boolean matches(Inventory inv, World world) {
		RecipeFinder finder = new RecipeFinder();
		return finder.findRecipe(this, null);
	}

	@Override
	public ItemStack craft(Inventory inv) {
		return this.output.copy();
	}

	@Override
	public boolean fits(int x, int y) {
		return true;
	}

	@Override
	public ItemStack getOutput() {
		return this.output;
	}

	@Override
	public Identifier getId() {
		return this.id;
	}
	
	@Override
	public DefaultedList<Ingredient> getPreviewInputs() {
		return ingredients;
	}
	
	@Environment(EnvType.CLIENT)
	public String getGroup() {
		return this.group;
	}
	
	@Environment(EnvType.CLIENT)
	public ItemStack getRecipeKindIcon() {
		return new ItemStack(MinalchemyBlocks.ALCHEMY_TABLE);
	}
	
	@Override
	public RecipeSerializer<?> getSerializer() {
		return MinalchemyRecipes.ALCHEMY_SERIALIZER;
	}

	@Override
	public RecipeType<?> getType() {
		return MinalchemyRecipes.ALCHEMY;
	}
}

AlchemyRecipeSerializer.java

package com.yanis48.minalchemy.recipe;

import com.google.gson.JsonArray;
import com.google.gson.JsonObject;

import net.minecraft.item.ItemStack;
import net.minecraft.recipe.Ingredient;
import net.minecraft.recipe.RecipeSerializer;
import net.minecraft.recipe.ShapedRecipe;
import net.minecraft.util.DefaultedList;
import net.minecraft.util.Identifier;
import net.minecraft.util.JsonHelper;
import net.minecraft.util.PacketByteBuf;

public class AlchemyRecipeSerializer implements RecipeSerializer<AlchemyRecipe> {

	@Override
	public AlchemyRecipe read(Identifier id, JsonObject json) {
		String group = JsonHelper.getString(json, "group", "");
		DefaultedList<Ingredient> ingredients = getIngredients(JsonHelper.getArray(json, "ingredients"));
		ItemStack result = ShapedRecipe.getItemStack(JsonHelper.getObject(json, "result"));
		return new AlchemyRecipe(id, group, result, ingredients);
	}

	@Override
	public AlchemyRecipe read(Identifier id, PacketByteBuf buf) {
		String group = buf.readString(32767);
		int ingredientSize = buf.readVarInt();
		DefaultedList<Ingredient> ingredients = DefaultedList.ofSize(ingredientSize, Ingredient.EMPTY);
		for(int i = 0; i < ingredients.size(); i++) {
			ingredients.set(i, Ingredient.fromPacket(buf));
		}
		ItemStack result = buf.readItemStack();
		return new AlchemyRecipe(id, group, result, ingredients);
	}

	@Override
	public void write(PacketByteBuf buf, AlchemyRecipe recipe) {
		buf.writeString(recipe.getGroup());
		for (Ingredient ingredient : recipe.ingredients) {
			ingredient.write(buf);
		}
		buf.writeItemStack(recipe.getOutput());
	}
	
	private static DefaultedList<Ingredient> getIngredients(JsonArray json) {
		DefaultedList<Ingredient> ingredients = DefaultedList.of();
		for (int i = 0; i < json.size(); i++) {
			Ingredient ingredient = Ingredient.fromJson(json.get(i));
			if (!ingredient.isEmpty()) {
				ingredients.add(ingredient);
			}
		}
		return ingredients;
	}
}