/*
 * Copyright (c) 2006-2009 Chris Smith, Shane Mc Cormack, Gregory Holmes
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.parser.irc.callbacks;

import java.util.Hashtable;

import com.dmdirc.parser.irc.ChannelInfo;
import com.dmdirc.parser.irc.ClientInfo;
import com.dmdirc.parser.irc.IRCParser;
import com.dmdirc.parser.irc.ParserError;
import com.dmdirc.parser.irc.callbacks.interfaces.ICallbackInterface;
import java.util.ArrayList;

/**
 * CallbackObjectSpecific.
 * Superclass for all callback types that have a "specific" target.
 *
 * @author            Shane Mc Cormack
 */
public class CallbackObjectSpecific extends CallbackObject {
	
	/** Hashtable for storing specific information for callback. */	
	protected volatile Hashtable<ICallbackInterface, String> specificData = new Hashtable<ICallbackInterface, String>();
	
	/**
	 * Create a new instance of the Callback Object.
	 *
	 * @param parser IRCParser That owns this callback
	 * @param manager CallbackManager that is in charge of this callback
     * @param type The type of callback to use
     * @since 0.6.3
	 */
	public CallbackObjectSpecific(final IRCParser parser,
            final CallbackManager manager, final Class<? extends ICallbackInterface> type) {
        super(parser, manager, type);
    }
	
	/**
	 * Used to check if a channel matches the specificData.
	 * 
	 * @param eMethod Object that is being called back to
	 * @param cChannel ChannelInfo object for the channel to test
	 * @return true if channel given matches the specifics for the method given
	 */
	protected boolean isValidChan(final ICallbackInterface eMethod, final ChannelInfo cChannel) {
		if (specificData.containsKey(eMethod)) { 
			if (!myParser.getIRCStringConverter().equalsIgnoreCase(cChannel.getName(), specificData.get(eMethod))) { return false; }
		}
		return true;
	}
	
	/**
	 * Used to check if a hostname matches the specificData.
	 * 
	 * @param eMethod Object that is being called back to
	 * @param sHost Hostname of user that sent the query
	 * @return true if host given matches the specifics for the method given
	 */
	protected boolean isValidUser(final ICallbackInterface eMethod, final String sHost) {
		final String nickname = ClientInfo.parseHost(sHost);
		if (specificData.containsKey(eMethod)) {
			if (!myParser.getIRCStringConverter().equalsIgnoreCase(nickname, specificData.get(eMethod))) { return false; }
		}
		return true;
	}
	
	// We override the default add method to make sure that any add with no
	// specifics will have the specific data removed.
	/**
	 * Add a new callback.
	 *
	 * @param eMethod Object to callback to.
	 */
    @Override
	public void add(final ICallbackInterface eMethod) {
		addCallback(eMethod);
		if (specificData.containsKey(eMethod)) { specificData.remove(eMethod); }
	}
	
	/**
	 * Add a new callback with a specific target.
	 *
	 * @param eMethod Object to callback to.
	 * @param specificTarget Target that must match for callback to be called.
	 */
	public void add(final ICallbackInterface eMethod, final String specificTarget) {
		add(eMethod);
		if (!specificTarget.isEmpty()) {
			specificData.put(eMethod, specificTarget);
		}
	}
	
	/**
	 * Remove a callback.
	 *
	 * @param eMethod Object to remove callback to.
	 */
    @Override
	public void del(final ICallbackInterface eMethod) {
		delCallback(eMethod);
		if (specificData.containsKey(eMethod)) { specificData.remove(eMethod); }
	}

    /**
     * Actually calls this callback. The specified arguments must match those
     * specified in the callback's interface, or an error will be raised.
     *
     * @param args The arguments to pass to the callback implementation
     * @return True if a method was called, false otherwise
     */
    @Override
    public boolean call(final Object ... args) {
		boolean bResult = false;

        final Object[] newArgs = new Object[args.length + 1];
        System.arraycopy(args, 0, newArgs, 1, args.length);
        newArgs[0] = myParser;

        if (myParser.getCreateFake()) {
            createFakeArgs(newArgs);
        }

		for (ICallbackInterface iface :new ArrayList<ICallbackInterface>(callbackInfo)) {
            if (type.isAnnotationPresent(SpecificCallback.class) &&
                    ((args[0] instanceof ClientInfo
                        && !isValidUser(iface, ((ClientInfo) args[0]).getHost()))
                        || (args[0] instanceof ChannelInfo
                        && !isValidChan(iface, (ChannelInfo) args[0]))
                        || (!(args[0] instanceof ClientInfo || args[0] instanceof ChannelInfo) &&
                        args[args.length - 1] instanceof String
                        && !isValidUser(iface, (String) args[args.length - 1])))) {
                continue;
            }

			try {
                type.getMethods()[0].invoke(iface, newArgs);
			} catch (Exception e) {
				final ParserError ei = new ParserError(ParserError.ERROR_ERROR,
                        "Exception in callback ("+e.getMessage()+")", myParser.getLastLine());
				ei.setException(e);
				callErrorInfo(ei);
			}
			bResult = true;
		}
		return bResult;
    }

}