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

export default 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

	}


	/* (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 = this.event.onconnected;

		/* (3) Bind callback.onclose */
		this.ws.onclose = this.event.onclose;

		/* (4) Bind callback.onerror */
		this.ws.onerror = this.event.onclose;

		/* (5) Bind callback.onreceive */
		this.ws.onmessage = (_message_event) => this.event.onreceive(_message_event.data);

		/* (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' ){
			this.state = ClientDriver.STATE.CONNECTED;
			return false;
		}

		/* (2) Send message */
		this.ws.send(_request.buffer);

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

	}


	/* (3) Closes the connection
	*
	* @return closed<boolean>			Whether the connection has been closed
	*
	---------------------------------------------------------*/
	close(){

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

		/* (1) Close websocket */
		this.ws.close();

		/* (2) Return success */
		return true;

	}



}