/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2020, AlgorithmX2, All rights reserved.
 *
 * Applied Energistics 2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Applied Energistics 2 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Applied Energistics 2.  If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.util.item;

import java.util.List;
import java.util.Objects;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import net.fabricmc.api.Environment;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.CompoundTag;
import net.minecraft.network.PacketByteBuf;
import net.minecraft.text.Text;
import net.fabricmc.api.EnvType;

import appeng.api.config.FuzzyMode;
import appeng.api.storage.IStorageChannel;
import appeng.api.storage.channels.IItemStorageChannel;
import appeng.api.storage.data.IAEItemStack;
import appeng.core.Api;
import appeng.util.Platform;
import net.minecraft.util.registry.Registry;

public final class AEItemStack extends AEStack<IAEItemStack> implements IAEItemStack {
    private static final String NBT_STACKSIZE = "cnt";
    private static final String NBT_REQUESTABLE = "req";
    private static final String NBT_CRAFTABLE = "craft";
    private static final String NBT_ITEMSTACK = "is";

    private final AESharedItemStack sharedStack;

    @Environment(EnvType.CLIENT)
    private Text displayName;
    @Environment(EnvType.CLIENT)
    private List<Text> tooltip;

    private AEItemStack(final AEItemStack is) {
        this.setStackSize(is.getStackSize());
        this.setCraftable(is.isCraftable());
        this.setCountRequestable(is.getCountRequestable());
        this.sharedStack = is.sharedStack;
    }

    private AEItemStack(final AESharedItemStack is, long size) {
        this.sharedStack = is;
        this.setStackSize(size);
        this.setCraftable(false);
        this.setCountRequestable(0);
    }

    @Nullable
    public static AEItemStack fromItemStack(@Nonnull final ItemStack stack) {
        if (stack.isEmpty()) {
            return null;
        }

        return new AEItemStack(AEItemStackRegistry.getRegisteredStack(stack), stack.getCount());
    }

    public static IAEItemStack fromNBT(final CompoundTag i) {
        if (i == null) {
            return null;
        }

        final ItemStack itemstack = ItemStack.fromTag(i.getCompound(NBT_ITEMSTACK));
        if (itemstack.isEmpty()) {
            return null;
        }

        final AEItemStack item = AEItemStack.fromItemStack(itemstack);
        item.setStackSize(i.getLong(NBT_STACKSIZE));
        item.setCountRequestable(i.getLong(NBT_REQUESTABLE));
        item.setCraftable(i.getBoolean(NBT_CRAFTABLE));
        return item;
    }

    @Override
    public void writeToNBT(final CompoundTag i) {
        final CompoundTag itemStack = new CompoundTag();
        this.getDefinition().toTag(itemStack);

        i.put(NBT_ITEMSTACK, itemStack);
        i.putLong(NBT_STACKSIZE, this.getStackSize());
        i.putLong(NBT_REQUESTABLE, this.getCountRequestable());
        i.putBoolean(NBT_CRAFTABLE, this.isCraftable());
    }

    public static AEItemStack fromPacket(final PacketByteBuf buffer) {
        final boolean isCraftable = buffer.readBoolean();
        final long stackSize = buffer.readVarLong();
        final long countRequestable = buffer.readVarLong();
        final ItemStack itemstack = buffer.readItemStack();

        if (itemstack.isEmpty()) {
            return null;
        }

        final AEItemStack item = new AEItemStack(AEItemStackRegistry.getRegisteredStack(itemstack), stackSize);
        item.setCountRequestable(countRequestable);
        item.setCraftable(isCraftable);
        return item;
    }

    @Override
    public void writeToPacket(final PacketByteBuf buffer) {
        buffer.writeBoolean(this.isCraftable());
        buffer.writeVarLong(this.getStackSize());
        buffer.writeVarLong(this.getCountRequestable());
        buffer.writeItemStack(getDefinition());
    }

    @Override
    public void add(final IAEItemStack option) {
        if (option == null) {
            return;
        }

        this.incStackSize(option.getStackSize());
        this.setCountRequestable(this.getCountRequestable() + option.getCountRequestable());
        this.setCraftable(this.isCraftable() || option.isCraftable());
    }

    @Override
    public boolean fuzzyComparison(final IAEItemStack other, final FuzzyMode mode) {
        final ItemStack itemStack = this.getDefinition();
        final ItemStack otherStack = other.getDefinition();

        return this.fuzzyItemStackComparison(itemStack, otherStack, mode);
    }

    @Override
    public IAEItemStack copy() {
        return new AEItemStack(this);
    }

    @Override
    public IStorageChannel<IAEItemStack> getChannel() {
        return Api.instance().storage().getStorageChannel(IItemStorageChannel.class);
    }

    @Override
    public ItemStack createItemStack() {
        return Platform.copyStackWithSize(this.getDefinition(),
                (int) Math.min(Integer.MAX_VALUE, this.getStackSize()));
    }

    @Override
    public Item getItem() {
        return this.getDefinition().getItem();
    }

    @Override
    public int getItemDamage() {
        return this.sharedStack.getItemDamage();
    }

    @Override
    public boolean isSameType(final IAEItemStack otherStack) {
        if (otherStack == null) {
            return false;
        }

        return Objects.equals(this.sharedStack, ((AEItemStack) otherStack).sharedStack);
    }

    @Override
    public boolean isSameType(final ItemStack otherStack) {
        if (otherStack.isEmpty()) {
            return false;
        }
        int oldSize = otherStack.getCount();

        otherStack.setCount(1);
        boolean ret = ItemStack.areEqual(this.getDefinition(), otherStack);
        otherStack.setCount(oldSize);

        return ret;
    }

    @Override
    public int hashCode() {
        return this.sharedStack.hashCode();
    }

    @Override
    public boolean equals(final Object ia) {
        if (ia instanceof AEItemStack) {
            return this.isSameType((AEItemStack) ia);
        } else if (ia instanceof ItemStack) {
            // this actually breaks the equals contract (being equals to unrelated classes)
            return equals((ItemStack) ia);
        }
        return false;
    }

    public boolean equals(final ItemStack is) {
        return this.isSameType(is);
    }

    @Override
    public String toString() {
        return this.getStackSize() + "x" + Registry.ITEM.getId(this.getDefinition().getItem());
    }

    @Environment(EnvType.CLIENT)
    public List<Text> getToolTip() {
        if (this.tooltip == null) {
            this.tooltip = Platform.getTooltip(this.asItemStackRepresentation());
        }
        return this.tooltip;
    }

    @Environment(EnvType.CLIENT)
    public Text getDisplayName() {
        if (this.displayName == null) {
            this.displayName = Platform.getItemDisplayName(this.asItemStackRepresentation());
        }
        return this.displayName;
    }

    @Environment(EnvType.CLIENT)
    public String getModID() {
        return Registry.ITEM.getId(this.getDefinition().getItem()).getNamespace();
    }

    @Override
    public boolean hasTagCompound() {
        return this.getDefinition().hasTag();
    }

    @Override
    public ItemStack asItemStackRepresentation() {
        return this.getDefinition().copy();
    }

    @Override
    public ItemStack getDefinition() {
        return this.sharedStack.getDefinition();
    }

    AESharedItemStack getSharedStack() {
        return this.sharedStack;
    }

    private boolean fuzzyItemStackComparison(ItemStack a, ItemStack b, FuzzyMode mode) {
        if (a.getItem() == b.getItem()) {
            if (a.getItem().isDamageable()) {
                if (mode == FuzzyMode.IGNORE_ALL) {
                    return true;
                } else if (mode == FuzzyMode.PERCENT_99) {
                    return (a.getDamage() > 1) == (b.getDamage() > 1);
                } else {
                    final float percentDamageOfA = (float) a.getDamage() / a.getMaxDamage();
                    final float percentDamageOfB = (float) b.getDamage() / b.getMaxDamage();

                    return (percentDamageOfA > mode.breakPoint) == (percentDamageOfB > mode.breakPoint);
                }
            }
        }

        return false;
    }
}