Chat-Module

Chat module is independent module for chatting, you have no need to save your messages anywhere, this module automatically done this.

install

	npm install chat-module

Events for chats

 * Below are the events that needs to understand for using this module - 	 
 		1. CHAT_USER_ONLINE - this event fire when any user reached online.
		2. CHAT_USER_OFFLINE - this event fire when any user reached offline.
		3. CHAT_NEW - this event is fire when a user wants to chat with new user that he haven't chat before.
		4. CHAT_NEW_MESSAGE - this event is fire whenever a new message sent.
		5. CHAT_NEW_PARTICIPANTS - this event is fire when a new participant added into group chat.
		6. CHAT_REMOVED_PARTICIPANTS - this event is fire when an existing user removed from group chat.
		7. CHAT_REMOVED_FROM - this event fire to user who removed from group chat.
		8. CHAT_LEFT - this event fire when user left chat by himself.

Set user id in request query while connecting socket from front-end, so it can set particular user socket.

	Ex.-

	io.connect('http://localhost:9980/chatroom', {
  query: 'user_id=' + userId
  });

Here "/chatroom" is the namespace for chat.

Setup chat

	* Create a folder name config in your root directory.
	* Create a file in config folder name default.json.
	* Set redisdb and mongodb configuration in json file as
			{
				"redis": {
						"server": "",
						"port": "",
						"options": {}
					},
					"mongo" : {
						 "uri": "",
						 "options": {}
					 }
			}

```js

var chat = require('chat');
chat.setup(server);

server : node server.

```

Initialize chat with namespace

	```js
	var chat = require('chat');
	var room = chat.init(namespace);

	```

	* Init method has one parameters.

	1. namespace: namespace for start chat.		

-----------------------------------------room instance have following functions-----------------------

Initiate private chat

	```js

	room.initiateChat(initiatorId,reciverId,callback);

	```
	* Method has three parameters.

	1. initiatorId: id of user who want to chat.
	2. reciverId: id of user to whom wants to chat.
	3. callback function.

Initiate group chat

```js

room.initiateGroupChat(initiatorId, participants, title, icon, callback);

```
* Method has four parameters.

1. initiatorId: id of user who creates group.
2. participants: array of user ids wants to added in group.
3. title: title for group.
4. icon: url for group image icon.(optional)
5. callback: callback function.

Post message on chat

	```js

	room.newMessage(chatId,fromUserId,browserId,message,callback);

	```
	* Method has four parameters.

	1. chatId : chat id (mongo id) in which user wants to chat either private or group chat.
	2. fromUserId : user id who send message.
	3. message : object
			ex. message = {
				text: 'hi this is new message', // required field
				file: 'url of shared file'      // optional field
			}
	4. browserId: unique id of browser.		
	5. callback function.

Add participants in group chat (any member in group can add new participant)

		```js

		room.addParticipants(chatId,userId,participants,callback)

		```
		* Method has four parameters.

		1. chatId : chat id (mongo id) in which user wants to add participants.
		2. userId :	user id who wants to add participants.
		3. participants : array of user ids.
		4. callback function.

Remove participants from group chat (only admin can remove participant from group)

		```js

		room.removeParticipants(chatId,userId,participants,callback)

		```
		* Method has four parameters.

		1. chatId : chat id (mongo id) in which user wants to remove participants.
		2. userId :	id of group admin.
		3. participants : array of user ids.
		4. callback function.

Get chat by id

		```js

		room.getChat(chatId,userId,callback);

		```
		* Method has three parameters.

		1. chatId : chat id (mongo id) user wants to get.
		2. userId : id of user.
		3. callback function.

Get chat messages

		```js

		room.getChatMessages(chatId,userId,skip,limit,callback);

		```
		* Method has three parameters.

		1. chatId : chat id (mongo id).
		2. userId : id of user.
		3. skip: skip.
		4. limit : limit.
		5. callback function.

Update chat

		```js

		room.updateChat(chatId,userId,title,icon,callback);

		```
		* Method has five parameters.

		1. chatId : chat id (mongo id).
		2. userId : id of user exist in group.
		3. title : title to be update //required
		4. icon : url of group icon image.
		5. callback function.

leave chat

		```js

		room.leaveChat(chatId, userId, callback);

		```
		* Method has three parameters.

		1. chatId : chat id (mongo id).
		2. userId : id of user who wants to leave chat.			
		5. callback function.

get chats

		```js

		room.getChats(userId, callback);

		```
		* Method has two parameters.

		2. userId : id of user who wants to get chats.			
		5. callback function.