import {ClientDriver} from './client-driver.js'

export class WebSocketClientDriver extends ClientDriver{


	/* (1) Creates a client driver
	*
	* @_resource<String>				Target resource (typically an URL)
	*
	---------------------------------------------------------*/
	constructor(_resource){

		/* (0) Parent check */
		if( !super().error )
			return;

		/* (1) Set inherited attributes */
		this.resource = _resource;

		/* (2) Create useful attributes */
		this.ws     = null;
		this.buffer = null; // useful when waiting for WebSocket to open

		/* (N) Set all is ok */
		this.error = false;

	}


	/* (2) Binds the client to the resource
	*
	* @return bound<boolean>			Whether the binding has been successful
	*
	---------------------------------------------------------*/
	bind(){

		/* (0) Parent check */
		if( !super.bind() )
			return false;

		/* (1) Create WebSocket client instance */
		this.ws = new WebSocket(this.resource);

		/* (2) Bind callback.onready */
		this.ws.onopen = function(){
			this.state = ClientDriver.STATE.CONNECTED;
			this.callback.onready();
		}.bind(this);

		/* (3) Bind callback.onclose */
		this.ws.onclose = function(){
			this.state = ClientDriver.STATE.CLOSED;
			this.callback.onclose();
		}.bind(this);

		/* (4) Bind callback.onerror */
		this.ws.onerror = function(){
			this.state = ClientDriver.STATE.CLOSED;
			this.callback.onclose();
		}.bind(this);

		/* (5) Bind callback.onreceive */
		this.ws.onmessage = function(response){
			this.state = ClientDriver.STATE.CONNECTED;
			this.callback.onreceive(response);
		}.bind(this);

		/* (6) Return success */
		return true;

	}


	/* (3) Send request
	*
	* @_request<Object>					Request data
	*
	* @return sent<boolean>				Whether the request has been successful
	*
	---------------------------------------------------------*/
	send(_request){

		/* (0) Parent check */
		if( !super.send(_request) )
			return false;

		/* (1) Error: invalid _request.buffer */
		if( typeof _request.buffer !== 'string' )
			return false;

		/* (2) Send message */
		console.log('sent', _request.buffer);
		this.ws.send(_request.buffer);

		/* (3) Return success */
		return true;

	}


	/* (4) Bind event to connection opened
	*
	* @_callback<Function>				Callback launched when connection is opened
	*
	* @return bound<boolean>			Whether the callback has successfully been bound
	*
	---------------------------------------------------------*/
	onready(_callback){

		/* (0) Parent check */
		if( !super.onready(_callback) )
			return false;

	}


	/* (5) Bind event to connection closed
	*
	* @_callback<Function>				Callback launched when connection is closed
	*
	* @return bound<boolean>			Whether the callback has successfully been bound
	*
	---------------------------------------------------------*/
	onclose(_callback){

		/* (0) Parent check */
		if( !super.onclose(_callback) )
			return false;

	}


	/* (6) Bind event to message reception
	*
	* @_callback<Function>				Callback launched when a message is received
	*
	* @return bound<boolean>			Whether the callback has successfully been bound
	*
	---------------------------------------------------------*/
	onreceive(_callback){

		/* (0) Parent check */
		if( !super.onreceive(_callback) )
			return false;

	}



}