/*
 * 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.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;

import appeng.api.config.FuzzyMode;
import appeng.api.storage.data.IAEItemStack;
import appeng.api.storage.data.IItemList;

abstract class AbstractItemList implements IItemList<IAEItemStack> {

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

        final IAEItemStack st = this.getRecords().get(((AEItemStack) option).getSharedStack());

        if (st != null) {
            st.add(option);
            return;
        }

        final IAEItemStack opt = option.copy();

        this.putItemRecord(opt);
    }

    @Override
    public IAEItemStack findPrecise(final IAEItemStack itemStack) {
        if (itemStack == null) {
            return null;
        }

        return this.getRecords().get(((AEItemStack) itemStack).getSharedStack());
    }

    @Override
    public Collection<IAEItemStack> findFuzzy(final IAEItemStack filter, final FuzzyMode fuzzy) {
        if (filter == null) {
            return Collections.emptyList();
        }

        return this.getRecords().values();
    }

    @Override
    public boolean isEmpty() {
        return !this.iterator().hasNext();
    }

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

        final IAEItemStack st = this.getRecords().get(((AEItemStack) option).getSharedStack());

        if (st != null) {
            st.incStackSize(option.getStackSize());
            return;
        }

        final IAEItemStack opt = option.copy();

        this.putItemRecord(opt);
    }

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

        final IAEItemStack st = this.getRecords().get(((AEItemStack) option).getSharedStack());

        if (st != null) {
            st.setCraftable(true);
            return;
        }

        final IAEItemStack opt = option.copy();
        opt.setStackSize(0);
        opt.setCraftable(true);

        this.putItemRecord(opt);
    }

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

        final IAEItemStack st = this.getRecords().get(((AEItemStack) option).getSharedStack());

        if (st != null) {
            st.setCountRequestable(st.getCountRequestable() + option.getCountRequestable());
            return;
        }

        final IAEItemStack opt = option.copy();
        opt.setStackSize(0);
        opt.setCraftable(false);
        opt.setCountRequestable(option.getCountRequestable());

        this.putItemRecord(opt);
    }

    @Override
    public IAEItemStack getFirstItem() {
        for (final IAEItemStack stackType : this) {
            return stackType;
        }

        return null;
    }

    @Override
    public int size() {
        int size = 0;
        for (IAEItemStack entry : getRecords().values()) {
            if (entry.isMeaningful()) {
                size++;
            }
        }

        return size;
    }

    @Override
    public Iterator<IAEItemStack> iterator() {
        return new MeaningfulItemIterator<>(this.getRecords().values());
    }

    @Override
    public void resetStatus() {
        for (final IAEItemStack i : this) {
            i.reset();
        }
    }

    abstract Map<AESharedItemStack, IAEItemStack> getRecords();

    private IAEItemStack putItemRecord(final IAEItemStack itemStack) {
        return this.getRecords().put(((AEItemStack) itemStack).getSharedStack(), itemStack);
    }

}