/*!
 * socket.io-node
 * Copyright(c) 2011 LearnBoost <dev@learnboost.com>
 * MIT Licensed
 */

/**
 * Module requirements.
 */

var Transport = require( '../transport' )
	, parser = require( '../parser' )
	, qs = require( 'querystring' );

/**
 * Export the constructor.
 */

exports = module.exports = HTTPTransport;

/**
 * HTTP interface constructor. For all non-websocket transports.
 *
 * @api public
 */

function HTTPTransport( mng, data, req ) {
	Transport.call( this, mng, data, req );
}
;

/**
 * Inherits from Transport.
 */

HTTPTransport.prototype.__proto__ = Transport.prototype;

/**
 * Handles a request.
 *
 * @api private
 */

HTTPTransport.prototype.handleRequest = function ( req ) {
	if ( req.method == 'POST' ) {
		var buffer = ''
			, res = req.res
			, origin = req.headers.origin
			, headers = { 'Content-Length' : 1, 'Content-Type' : 'text/plain; charset=UTF-8' }
			, self = this;

		req.on( 'data', function ( data ) {
			buffer += data;

			if ( Buffer.byteLength( buffer ) >= self.manager.get( 'destroy buffer size' ) ) {
				buffer = '';
				req.connection.destroy();
			}
		} );

		req.on( 'end', function () {
			res.writeHead( 200, headers );
			res.end( '1' );

			self.onData( self.postEncoded ? qs.parse( buffer ).d : buffer );
		} );

		// prevent memory leaks for uncompleted requests
		req.on( 'close', function () {
			buffer = '';
		} );

		if ( origin ) {
			// https://developer.mozilla.org/En/HTTP_Access_Control
			headers['Access-Control-Allow-Origin'] = origin;
			headers['Access-Control-Allow-Credentials'] = 'true';
		}
	} else {
		this.response = req.res;

		Transport.prototype.handleRequest.call( this, req );
	}
};

/**
 * Handles data payload.
 *
 * @api private
 */

HTTPTransport.prototype.onData = function ( data ) {
	var messages = parser.decodePayload( data );
	this.log.debug( this.name + ' received data packet', data );

	for ( var i = 0, l = messages.length; i < l; i++ ) {
		this.onMessage( messages[i] );
	}
};

/**
 * Closes the request-response cycle
 *
 * @api private
 */

HTTPTransport.prototype.doClose = function () {
	this.response.end();
};

/**
 * Writes a payload of messages
 *
 * @api private
 */

HTTPTransport.prototype.payload = function ( msgs ) {
	this.write( parser.encodePayload( msgs ) );
};