class Network{

	constructor(defs){
		this._httpMethods = ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'];

		this._defs = {
			'GET': {},
			'POST': {},
			'OPTIONS': {},
			'DELETE': {},
			'PUT': {},
			'ALL': defs || {}
		};

		this._request = reqwest;
		this._headers = {
			'GET': {},
			'POST': {},
			'PUT': {},
			'DELETE': {},
			'ALL': {}
		};

		this._transforms = {
			'GET' : [],
			'POST' : [],
			'PUT' : [],
			'DELETE': [],
			'ALL' : []
		};

		this._filters = {
			'GET' : [],
			'POST' : [],
			'PUT' : [],
			'DELETE': [],
			'ALL' : []
		};
	}

	setHeader(method, headers){
		method = method || 'ALL';
		for(var key in headers){
			this._headers[method][key] = headers[key];
		}
	}

	setOption(key, value, method){
		method = method || 'ALL';

		for(var key in headers){
			this._defs[method][key] = value;
		}

	}

	createRequest(options){

		// Makes a fully qualified request.. adds callback etc etc blah blah
		options['method']  = options['method'] || 'GET';

		if( this._httpMethods.indexOf(options['method']) ){
			throw new Error('Unknown HTTP method');
		}

		options['headers'] = options['headers'] || {};

		// Perform various transformations
		transforms = _.flatten(this._transforms['ALL'], this._transforms[method] );
		options = this._transforms[method].reduce((options, transform) => {
			return transform(options);
		}, options);


		// Add options... this can be used to encorporate
		// Default headers aswell
		_.assign(options, this._defs['ALL']);
		_.assign(options, this._defs[options['method']]);

		// No transforms for now.
		options['headers'] = _.assign(options['headers'], this._headers['ALL']);
		options['headers'] = _.assign(options['headers'], this._headers[options['method']]);

		// Just simple
		var request = this._request;
		var callbacks = _.flatten(this._filters['ALL'], this._filters['method']);
		var r = request(options);

		// Just Incredible
		return callbacks.reduce((prev, curr) => {
			return prev.then.apply(prev, curr);
		}, r);

	}

	registerFilter(method, filter){

		method = method || 'ALL';

		if( ! Array.isArray( filter )){
			filter = [filter];
		}

		this._filters[method].push(filter);

	}

	get( url, data ){
		return this.createRequest({
			method 	: 'GET',
			url	: url,
			data	: data
		});
	}

	post(url, data){
		return this.createRequest({
			url		: url,
			data 	: data,
			method 	: 'POST',
		});
	}

	put(url, data){
		return this.createRequest({
			url		: url,
			data	: data,
			method 	: 'POST'
		});
	}

	delete(url, data){
		return this.createRequest({
			url	: url,
			data	: data
		});
	}
}


export default Network;