/*
 * Copyright (c) 2006-2013 DMDirc Developers
 *
 * 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;

import com.dmdirc.actions.ActionManager;
import com.dmdirc.actions.CoreActionType;
import com.dmdirc.commandparser.CommandManager;
import com.dmdirc.commandparser.CommandType;
import com.dmdirc.commandparser.parsers.QueryCommandParser;
import com.dmdirc.logger.ErrorLevel;
import com.dmdirc.logger.Logger;
import com.dmdirc.parser.common.CallbackManager;
import com.dmdirc.parser.common.CallbackNotFoundException;
import com.dmdirc.parser.common.CompositionState;
import com.dmdirc.parser.interfaces.ClientInfo;
import com.dmdirc.parser.interfaces.Parser;
import com.dmdirc.parser.interfaces.callbacks.CompositionStateChangeListener;
import com.dmdirc.parser.interfaces.callbacks.NickChangeListener;
import com.dmdirc.parser.interfaces.callbacks.PrivateActionListener;
import com.dmdirc.parser.interfaces.callbacks.PrivateMessageListener;
import com.dmdirc.parser.interfaces.callbacks.QuitListener;
import com.dmdirc.ui.WindowManager;
import com.dmdirc.ui.core.components.WindowComponent;
import com.dmdirc.ui.input.TabCompleter;
import com.dmdirc.ui.input.TabCompletionType;

import java.awt.Toolkit;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

/**
 * The Query class represents the client's view of a query with another user.
 * It handles callbacks for query events from the parser, maintains the
 * corresponding QueryWindow, and handles user input for the query.
 */
public class Query extends MessageTarget implements PrivateActionListener,
        PrivateMessageListener, NickChangeListener, QuitListener,
        CompositionStateChangeListener {

    /** The Server this Query is on. */
    private Server server;

    /** The full host and nickname of the client associated with this Query. */
    private String host, nickname;

    /** The tab completer for the query window. */
    private final TabCompleter tabCompleter;

    /**
     * Creates a new instance of Query.
     *
     * @param newHost host of the remove client
     * @param newServer The server object that this Query belongs to
     */
    public Query(final Server newServer, final String newHost) {
        this(newServer, newHost, false);
    }

    /**
     * Creates a new instance of Query.
     *
     * @param newHost host of the remove client
     * @param newServer The server object that this Query belongs to
     * @param focus Should we focus the query on open?
     */
    public Query(final Server newServer, final String newHost,
            final boolean focus) {
        super("query", newServer.parseHostmask(newHost)[0],
                newServer.parseHostmask(newHost)[0],
                newServer.getConfigManager(), new QueryCommandParser(newServer),
                Arrays.asList(WindowComponent.TEXTAREA.getIdentifier(),
                WindowComponent.INPUTFIELD.getIdentifier()));

        this.server = newServer;
        this.host = newHost;
        this.nickname = server.parseHostmask(host)[0];

        WindowManager.getWindowManager().addWindow(server, this, focus);

        ActionManager.getActionManager().triggerEvent(
                CoreActionType.QUERY_OPENED, null, this);

        tabCompleter = new TabCompleter(getConfigManager(), server.getTabCompleter());
        tabCompleter.addEntries(TabCompletionType.COMMAND,
                CommandManager.getCommandManager().getCommandNames(CommandType.TYPE_QUERY));
        tabCompleter.addEntries(TabCompletionType.COMMAND,
                CommandManager.getCommandManager().getCommandNames(CommandType.TYPE_CHAT));

        if (!server.getState().isDisconnected()) {
            reregister();
        }

        updateTitle();
    }

    /** {@inheritDoc} */
    @Override
    public TabCompleter getTabCompleter() {
        return tabCompleter;
    }

    /** {@inheritDoc} */
    @Override
    public void sendLine(final String line) {
        sendLine(line, getNickname());
    }

    /**
     * Sends a line to the recipient of this query using the specified
     * nickname or hostmask as a target. This allows for users to send
     * messages with a server specified (e.g. <code>nick@server</code>)
     * as though the query wasn't open.
     * <p>
     * The caller is responsible for ensuring that the <code>target</code>
     * does actually correspond to this query.
     *
     * @since 0.6.4
     * @param line The line to be sent
     * @param target The target to send the line to
     */
    public void sendLine(final String line, final String target) {
        if (server.getState() != ServerState.CONNECTED) {
            Toolkit.getDefaultToolkit().beep();
            return;
        }

        for (String part : splitLine(line)) {
            if (!part.isEmpty()) {
                server.getParser().sendMessage(target, part);

                doNotification("querySelfMessage",
                        CoreActionType.QUERY_SELF_MESSAGE,
                        server.getParser().getLocalClient(), line);
            }
        }
    }

    /** {@inheritDoc} */
    @Override
    protected boolean processNotificationArg(final Object arg, final List<Object> args) {
        if (arg instanceof ClientInfo) {
            final ClientInfo clientInfo = (ClientInfo) arg;
            args.add(clientInfo.getNickname());
            args.add(clientInfo.getUsername());
            args.add(clientInfo.getHostname());
            return true;
        } else {
            return super.processNotificationArg(arg, args);
        }
    }

    /** {@inheritDoc} */
    @Override
    public int getMaxLineLength() {
        return server.getState() == ServerState.CONNECTED ? server.getParser()
                .getMaxLength("PRIVMSG", host) : -1;
    }

    /**
     * Sends a private action to the remote user.
     *
     * @param action action text to send
     */
    @Override
    public void sendAction(final String action) {
        if (server.getState() != ServerState.CONNECTED) {
            Toolkit.getDefaultToolkit().beep();
            return;
        }

        final ClientInfo client = server.getParser().getLocalClient();
        final int maxLineLength = server.getParser().getMaxLength("PRIVMSG", host);

        if (maxLineLength >= action.length() + 2) {
            server.getParser().sendAction(getNickname(), action);

            doNotification("querySelfAction", CoreActionType.QUERY_SELF_ACTION,
                    client, action);
        } else {
            addLine("actionTooLong", action.length());
        }
    }

    /** {@inheritDoc} */
    @Override
    public void onPrivateMessage(final Parser parser, final Date date,
            final String message, final String host) {
        final String[] parts = server.parseHostmask(host);

        final StringBuffer buff = new StringBuffer("queryMessage");

        ActionManager.getActionManager().triggerEvent(
                CoreActionType.QUERY_MESSAGE, buff, this,
                parser.getClient(host), message);

        addLine(buff, parts[0], parts[1], parts[2], message);
    }

    /** {@inheritDoc} */
    @Override
    public void onPrivateAction(final Parser parser, final Date date,
            final String message, final String host) {
        final String[] parts = server.parseHostmask(host);

        final StringBuffer buff = new StringBuffer("queryAction");

        ActionManager.getActionManager().triggerEvent(
                CoreActionType.QUERY_ACTION, buff, this, parser.getClient(host),
                message);

        addLine(buff, parts[0], parts[1], parts[2], message);
    }

    /**
     * Updates the QueryWindow's title.
     */
    private void updateTitle() {
        setTitle(getNickname());
    }

    /**
     * Reregisters query callbacks. Called when reconnecting to the server.
     */
    public void reregister() {
        final CallbackManager callbackManager = server.getParser().getCallbackManager();
        final String nick = getNickname();

        try {
            callbackManager.addCallback(PrivateActionListener.class, this, nick);
            callbackManager.addCallback(PrivateMessageListener.class, this, nick);
            callbackManager.addCallback(CompositionStateChangeListener.class, this, nick);
            callbackManager.addCallback(QuitListener.class, this);
            callbackManager.addCallback(NickChangeListener.class, this);
        } catch (CallbackNotFoundException ex) {
            Logger.appError(ErrorLevel.HIGH, "Unable to get query events", ex);
        }
    }

    /** {@inheritDoc} */
    @Override
    public void onNickChanged(final Parser parser, final Date date,
            final ClientInfo client, final String oldNick) {
        if (oldNick.equals(getNickname())) {
            final CallbackManager callbackManager = server.getParser().getCallbackManager();

            callbackManager.delCallback(PrivateActionListener.class, this);
            callbackManager.delCallback(PrivateMessageListener.class, this);
            callbackManager.delCallback(CompositionStateChangeListener.class, this);

            try {
                callbackManager.addCallback(PrivateActionListener.class, this, client.getNickname());
                callbackManager.addCallback(PrivateMessageListener.class, this, client.getNickname());
                callbackManager.addCallback(CompositionStateChangeListener.class, this, client.getNickname());
            } catch (CallbackNotFoundException ex) {
                Logger.appError(ErrorLevel.HIGH, "Unable to get query events", ex);
            }

            final StringBuffer format = new StringBuffer("queryNickChanged");

            ActionManager.getActionManager().triggerEvent(
                    CoreActionType.QUERY_NICKCHANGE, format, this, oldNick);

            server.updateQuery(this, oldNick, client.getNickname());

            addLine(format, oldNick, client.getUsername(),
                    client.getHostname(), client.getNickname());
            host = client.getNickname() + "!" + client.getUsername() + "@" + client.getHostname();
            nickname = client.getNickname();
            updateTitle();

            setName(client.getNickname());
        }
    }

    /** {@inheritDoc} */
    @Override
    public void onQuit(final Parser parser, final Date date,
            final ClientInfo client, final String reason) {
        if (client.getNickname().equals(getNickname())) {
            final StringBuffer format = new StringBuffer(reason.isEmpty()
                ? "queryQuit" : "queryQuitReason");

            ActionManager.getActionManager().triggerEvent(
                    CoreActionType.QUERY_QUIT, format, this, reason);

            addLine(format, client.getNickname(),
                    client.getUsername(), client.getHostname(), reason);
        }
    }

    /** {@inheritDoc} */
    @Override
    public void onCompositionStateCanged(final Parser parser, final Date date,
            final CompositionState state, final String host) {
        if (state == CompositionState.TYPING) {
            addComponent(WindowComponent.TYPING_INDICATOR.getIdentifier());
        } else {
            removeComponent(WindowComponent.TYPING_INDICATOR.getIdentifier());
        }
    }

    /**
     * Returns the Server associated with this query.
     *
     * @return associated Server
     */
    @Override
    public Server getServer() {
        return server;
    }

    /** {@inheritDoc} */
    @Override
    public void windowClosing() {
        // 2: Remove any callbacks or listeners
        if (server != null && server.getParser() != null) {
            server.getParser().getCallbackManager().delAllCallback(this);
        }

        // 3: Trigger any actions neccessary

        // 4: Trigger action for the window closing
        ActionManager.getActionManager().triggerEvent(
                CoreActionType.QUERY_CLOSED, null, this);

        // 5: Inform any parents that the window is closing
        if (server != null) {
            server.delQuery(this);
        }
    }

    /** {@inheritDoc} */
    @Override
    public void windowClosed() {
        // 7: Remove any references to the window and parents
        server = null;
    }

    /**
     * Returns the host that this query is with.
     *
     * @return The full host that this query is with
     */
    public String getHost() {
        return host;
    }

    /**
     * Returns the current nickname of the user that this query is with.
     *
     * @return The nickname of this query's user
     */
    public String getNickname() {
        return nickname;
    }

    /** {@inheritDoc} */
    @Override
    public void setCompositionState(final CompositionState state) {
        getServer().getParser().setCompositionState(host, state);
    }

}
