package com.beem.project.beem.service;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.jivesoftware.smack.Chat;
import org.jivesoftware.smack.ChatManager;
import org.jivesoftware.smack.ChatManagerListener;
import org.jivesoftware.smack.MessageListener;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smackx.ChatState;
import org.jivesoftware.smackx.ChatStateListener;

import android.app.Notification;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.RemoteCallbackList;
import android.os.RemoteException;
import android.util.Log;

import com.beem.project.beem.BeemService;
import com.beem.project.beem.R;
import com.beem.project.beem.service.aidl.IChat;
import com.beem.project.beem.service.aidl.IChatManager;
import com.beem.project.beem.service.aidl.IChatManagerListener;
import com.beem.project.beem.service.aidl.IMessageListener;
import com.beem.project.beem.service.aidl.IRoster;

/**
 * An adapter for smack's ChatManager. This class provides functionnality to handle chats.
 * @author darisk
 */
public class BeemChatManager extends IChatManager.Stub {

    /**
     * A listener for all the chat creation event that happens on the connection.
     * @author darisk
     */
    private class ChatListener implements ChatStateListener, ChatManagerListener, MessageListener {

	/**
	 * Constructor.
	 */
	public ChatListener() {
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void chatCreated(Chat chat, boolean locally) {
	    IChat newchat = getChat(chat);
	    chat.addMessageListener(mChatListener);
	    final int n = mRemoteChatCreationListeners.beginBroadcast();

	    for (int i = 0; i < n; i++) {
		IChatManagerListener listener = mRemoteChatCreationListeners.getBroadcastItem(i);
		try {
		    listener.chatCreated(newchat, locally);
		} catch (RemoteException e) {
		    // The RemoteCallbackList will take care of removing the
		    // dead listeners.
		    Log.w(TAG, " Error while triggering remote connection listeners in chat creation", e);
		}
	    }
	    mRemoteChatCreationListeners.finishBroadcast();
	}

	/**
	 * Create the PendingIntent to launch our activity if the user select this chat notification.
	 * @param chat A ChatAdapter instance
	 * @return A Chat activity PendingIntent
	 */
	private PendingIntent makeChatIntent(IChat chat) {
	    Intent chatIntent = new Intent(mService, com.beem.project.beem.ui.Chat.class);
	    chatIntent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT | Intent.FLAG_ACTIVITY_SINGLE_TOP);
	    try {
		chatIntent.setData(chat.getParticipant().toUri());
	    } catch (RemoteException e) {
		Log.e(TAG, e.getMessage());
	    }
	    PendingIntent contentIntent = PendingIntent.getActivity(mService, 0, chatIntent,
		PendingIntent.FLAG_UPDATE_CURRENT);
	    return contentIntent;
	}

	/**
	 * Set a notification of a new chat.
	 * @param chat The chat to access by the notification
	 */
	private void notifyNewChat(IChat chat) {
	    try {
		CharSequence tickerText = mService.getBind().getRoster().getContact(chat.getParticipant().getJID())
		    .getName();
		Notification notification = new Notification(android.R.drawable.stat_notify_chat, tickerText, System
		    .currentTimeMillis());
		notification.defaults = Notification.DEFAULT_ALL;
		notification.flags = Notification.FLAG_AUTO_CANCEL;
		notification.setLatestEventInfo(mService, tickerText, mService
		    .getString(R.string.BeemChatManagerNewMessage), makeChatIntent(chat));
		mService.sendNotification(chat.hashCode(), notification);
	    } catch (RemoteException e) {
		Log.e(TAG, e.getMessage());
	    }
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void processMessage(Chat chat, Message message) {
	    ChatAdapter newchat = getChat(chat);
	    try {
		if (message.getBody() != null)
		    newchat.addMessage(new com.beem.project.beem.service.Message(message));
		final int n = mRemoteMessageListeners.beginBroadcast();
		for (int i = 0; i < n; i++) {
		    IMessageListener listener = mRemoteMessageListeners.getBroadcastItem(i);
		    listener.processMessage(newchat, new com.beem.project.beem.service.Message(message));
		}
		mRemoteMessageListeners.finishBroadcast();
		if (!newchat.isOpen() && message.getBody() != null) {
		    notifyNewChat(newchat);
		}
	    } catch (RemoteException e) {
		Log.w(TAG, e.getMessage());
	    }
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void stateChanged(Chat chat, ChatState state) {
	    IChat newchat = getChat(chat);
	    try {
		newchat.setState(state.name());
	    } catch (RemoteException e) {
		e.printStackTrace();
	    }
	    final int n = mRemoteMessageListeners.beginBroadcast();

	    for (int i = 0; i < n; i++) {
		IMessageListener listener = mRemoteMessageListeners.getBroadcastItem(i);
		try {
		    listener.stateChanged(newchat);
		} catch (RemoteException e) {
		    Log.w(TAG, e.getMessage());
		}
	    }
	    mRemoteMessageListeners.finishBroadcast();
	}
    }

    /**
     * Tag to use with log methods.
     */
    public static final String TAG = "BeemChatManager";
    private final ChatManager mAdaptee;
    private final Map<String, ChatAdapter> mChats = new HashMap<String, ChatAdapter>();
    private final ChatListener mChatListener = new ChatListener();
    private final RemoteCallbackList<IChatManagerListener> mRemoteChatCreationListeners = new RemoteCallbackList<IChatManagerListener>();
    private final RemoteCallbackList<IMessageListener> mRemoteMessageListeners = new RemoteCallbackList<IMessageListener>();
    private final BeemService mService;

    /**
     * Constructor.
     * @param chatManager the smack ChatManager to adapt
     * @param service the service which runs the chat manager
     */
    public BeemChatManager(final ChatManager chatManager, final BeemService service) {
	mService = service;
	mAdaptee = chatManager;
	mAdaptee.addChatListener(mChatListener);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void addChatCreationListener(IChatManagerListener listener) throws RemoteException {
	mRemoteChatCreationListeners.register(listener);
    }

    /**
     * Create a chat session.
     * @param contact the contact you want to chat with
     * @param listener listener to use for chat events on this chat session
     * @return the chat session
     */
    public IChat createChat(Contact contact, IMessageListener listener) {
	String jid = contact.getJID();
	return createChat(jid, listener);
    }

    /**
     * Create a chat session.
     * @param jid the jid of the contact you want to chat with
     * @param listener listener to use for chat events on this chat session
     * @return the chat session
     */
    public IChat createChat(String jid, IMessageListener listener) {
	mRemoteMessageListeners.register(listener);
	String key = StringUtils.parseBareAddress(jid);
	if (mChats.containsKey(key)) {
	    return mChats.get(key);
	}
	mAdaptee.createChat(key, mChatListener);
	return mChats.get(key);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void destroyChat(IChat chat) throws RemoteException {
	Log.d(TAG, "BEGIN destroyChat - jid = " + chat.getParticipant().getJID());
	IChat c = mChats.remove(chat.getParticipant().getJID());
	if (c == null)
	    Log.w(TAG, "destroyChat - chat = null, jid = " + chat.getParticipant().getJID());
	Log.d(TAG, "END destroyChat - jid = " + chat.getParticipant().getJID());
    }

    @Override
    public void deleteChatNotification(IChat chat) {
	mService.deleteNotification(chat.hashCode());
    }

    /**
     * Get an existing ChatAdapter or create it if necessary.
     * @param chat The real instance of smack chat
     * @return a chat adapter register in the manager
     */
    private ChatAdapter getChat(Chat chat) {
	String key = StringUtils.parseBareAddress(chat.getParticipant());
	if (mChats.containsKey(key)) {
	    return mChats.get(key);
	}
	ChatAdapter res = new ChatAdapter(chat);
	mChats.put(key, res);
	return res;
    }

    /**
     * This methods permits to retrieve the list of contacts who have an opened chat session with us.
     * @return An List containing Contact instances.
     * @throws RemoteException If a Binder remote-invocation error occurred.
     */
    public List<Contact> getOpenedChatList() throws RemoteException {
	List<Contact> openedChats = new ArrayList<Contact>();
	IRoster mRoster = mService.getBind().getRoster();

	for (ChatAdapter chat : mChats.values()) {
	    if (!chat.isOpen())
		openedChats.add(mRoster.getContact(chat.getParticipant().getJID()));
	}
	return openedChats;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void removeChatCreationListener(IChatManagerListener listener) throws RemoteException {
	mRemoteChatCreationListeners.unregister(listener);
    }

}
