/*
 * This file is part of Applied Energistics 2.
 * Copyright (c) 2013 - 2015, 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.core;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

import appeng.api.config.TunnelType;
import appeng.core.api.IIMCProcessor;
import appeng.core.api.imc.*;
import cpw.mods.fml.common.event.FMLInterModComms;

/**
 * Handles the delegation of the corresponding IMC messages to the suitable IMC processors
 *
 * @author thatsIch
 * @version rv3 - 10.08.2015
 * @since rv1
 */
public class IMCHandler {
    private static final int INITIAL_PROCESSORS_CAPACITY = 20;

    /**
     * Contains the processors,
     * <p>
     * is mutable, but write access only by the constructor
     */
    private final Map<String, IIMCProcessor> processors;

    /**
     * Initializes the processors
     */
    public IMCHandler() {
        this.processors = new HashMap<String, IIMCProcessor>(INITIAL_PROCESSORS_CAPACITY);

        this.processors.put("blacklist-block-spatial", new IMCBlackListSpatial());
        this.processors.put("whitelist-spatial", new IMCSpatial());
        this.processors.put("add-grindable", new IMCGrinder());
        this.processors.put("add-mattercannon-ammo", new IMCMatterCannon());

        for (final TunnelType type : TunnelType.values()) {
            this.processors.put(
                "add-p2p-attunement-"
                    + type.name().replace('_', '-').toLowerCase(Locale.ENGLISH),
                new IMCP2PAttunement()
            );
        }
    }

    /**
     * Tries to find every message matching the internal IMC keys. When found the
     * corresponding handler will process the attached message.
     *
     * @param event Event carrying the identifier and message for the handlers
     */
    void handleIMCEvent(final FMLInterModComms.IMCEvent event) {
        for (final FMLInterModComms.IMCMessage message : event.getMessages()) {
            final String key = message.key;

            try {
                final IIMCProcessor handler = this.processors.get(key);
                if (handler != null) {
                    handler.process(message);
                } else {
                    throw new IllegalStateException("Invalid IMC Called: " + key);
                }
            } catch (final Exception t) {
                AELog.warn(
                    "Problem detected when processing IMC " + key + " from "
                    + message.getSender()
                );
                AELog.debug(t);
            }
        }
    }
}