/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2014, 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;

import java.util.EnumMap;
import java.util.Map;
import java.util.Set;

import appeng.api.config.LevelEmitterMode;
import appeng.api.config.Settings;
import appeng.api.config.StorageFilter;
import appeng.api.util.IConfigManager;
import appeng.core.AELog;
import net.minecraft.nbt.NBTTagCompound;

public final class ConfigManager implements IConfigManager {
    private final Map<Settings, Enum<?>> settings
        = new EnumMap<Settings, Enum<?>>(Settings.class);
    private final IConfigManagerHost target;

    public ConfigManager(final IConfigManagerHost tile) {
        this.target = tile;
    }

    @Override
    public Set<Settings> getSettings() {
        return this.settings.keySet();
    }

    @Override
    public void registerSetting(final Settings settingName, final Enum defaultValue) {
        this.settings.put(settingName, defaultValue);
    }

    @Override
    public Enum<?> getSetting(final Settings settingName) {
        final Enum<?> oldValue = this.settings.get(settingName);

        if (oldValue != null) {
            return oldValue;
        }

        throw new IllegalStateException(
            "Invalid Config setting. Expected a non-null value for " + settingName
        );
    }

    @Override
    public Enum<?> putSetting(final Settings settingName, final Enum newValue) {
        final Enum<?> oldValue = this.getSetting(settingName);
        this.settings.put(settingName, newValue);
        this.target.updateSetting(this, settingName, newValue);
        return oldValue;
    }

    /**
     * save all settings using config manager.
     *
     * @param tagCompound to be written to compound
     */
    @Override
    public void writeToNBT(final NBTTagCompound tagCompound) {
        for (final Map.Entry<Settings, Enum<?>> entry : this.settings.entrySet()) {
            tagCompound.setString(
                entry.getKey().name(), this.settings.get(entry.getKey()).toString()
            );
        }
    }

    /**
     * read all settings using config manager.
     *
     * @param tagCompound to be read from compound
     */
    @Override
    public void readFromNBT(final NBTTagCompound tagCompound) {
        for (final Map.Entry<Settings, Enum<?>> entry : this.settings.entrySet()) {
            try {
                if (tagCompound.hasKey(entry.getKey().name())) {
                    String value = tagCompound.getString(entry.getKey().name());

                    // Provides an upgrade path for the rename of this value in the API
                    // between rv1 and rv2
                    if (value.equals("EXTACTABLE_ONLY")) {
                        value = StorageFilter.EXTRACTABLE_ONLY.toString();
                    } else if (value.equals("STOREABLE_AMOUNT")) {
                        value = LevelEmitterMode.STORABLE_AMOUNT.toString();
                    }

                    final Enum<?> oldValue = this.settings.get(entry.getKey());

                    final Enum<?> newValue = Enum.valueOf(oldValue.getClass(), value);

                    this.putSetting(entry.getKey(), newValue);
                }
            } catch (final IllegalArgumentException e) {
                AELog.debug(e);
            }
        }
    }
}