<?php

class Braintree_Driver extends Payment_Driver
{
	/**
	 * URL to Use
	*/
	private $_api_url;

	/**
	 * Endpoint to Send the Query To
	*/
	private $_endpoint;

	/**
	 * The particular API which is being used
	*/
	private $_api;

	/**
	 * The particular API method which is being used
	*/
	private $_api_method;

	/**
	 * The PHP Payments library method
	*/
	private $_lib_method;

	/**
	 * Stores Settings for the Transaction
	*/
	private $_settings;

	/**
	 * The Constructor Function
	*/
	public function __construct($config)
	{
		Payment_Utility::load('file', 'vendor/braintree/lib/Braintree');

		$bt_mode = ($config['mode'] == 'test') ? 'sandbox' : 'production';
		Braintree_Configuration::environment($bt_mode);
		unset($config['mode']);

		foreach($config as $k=>$v)
		{
			//merchantId, publicKey, privateKey need to be set
			Braintree_Configuration::$k($v);	
		}
	}

	/**
	 * Call Magic Method
	 */
	public function __call($method, $params)
	{	
		$args = $params[0];
	
		$method_map = $this->method_map();
		
		$this->_api = $method_map[$method]['api'];
		$this->_api_method = (isset($method_map[$method]['method'])) ? $method_map[$method]['method'] : '';
		$this->_lib_method = $method;
		
		list($api, $api_method, $params_ready) = $this->_build_request($args);
		
		try {
			//If the only param is an id, just use that as a string instead of sending an array
			if(count($params_ready) == 1 && isset($params_ready['id'])) 
			{
				$response_raw = $api::$api_method($param_ready['id']);
			}
			else if(count($params_ready) == 2 && isset($params_ready['id']) && isset($params_ready['amount']))
			{
				$response_raw = $api::$api_method($params_ready['id'], $params_ready['amount']);
			}
			else
			{
				$response_raw = $api::$api_method($params_ready);
			}
		}
		catch (Exception $e) {
			if(get_class($e) == 'Braintree_Exception_Authentication') $message = "Authentication failed.";
			return Payment_Response::instance()->gateway_response(
				'failure',
				$method.'_gateway_failure',
				(isset($message)) ? $message : $e->getMessage()
			);
		}

		return $this->_parse_response($response_raw);
	}

	/**
	 * Maps PHP-Payments Methods to Details Particular to Each Request for that Method
	 */
	public function method_map()
	{
		$map = array(
			'oneoff_payment' => array(
				'api' => 'Braintree_Transaction',
				'method' => 'sale',
				'required' => array(
					'cc_number',
					'cc_exp',
					'amt',
				),
				'keymatch' => array(
					'amt' => 'amount',
					'identifier' => 'orderId',
					'cc_number' => 'creditCard["number"]',
					'cc_exp' => 'creditCard["expirationDate"]',
					'cc_code' => 'creditCard["cvv"]',
					'first_name' => 'billing["firstName"]',
					'last_name' => 'billing["lastName"]',
					'street' => 'billing["streetAddress"]',
					'street2' => 'billing["extendedAddress"]',
					'postal_code' => 'billing["postalCode"]',
					'state' => 'billing["region"]',
					'country' => 'billing["countryCodeAlpha2"]',
					'city' => 'billing["locality"]',
					'ship_to_first_name' => 'shipping["firstName"]',
					'ship_to_last_name' => 'shipping["lastName"]',
					'ship_to_company' => 'shipping["company"]',
					'ship_to_street' => 'shipping["streetAddress"]',
					'ship_to_city' => 'shipping["locality"]',
					'ship_to_state' => 'shipping["state"]',
					'ship_to_postal_code' => 'shipping["postalCode"]',
					'ship_to_country' => 'shipping["countryCodeAlpha2"]'
				),
				'static' => array(
					'options' => array(
						'submitForSettlement' => true
					)
				)
			),
			'authorize_payment' => array(
				'api' => 'Braintree_Transaction',
				'method' => 'sale',
				'required' => array(
					'cc_number',
					'cc_exp',
					'amt',
				),
				'keymatch' => array(
					'amt' => 'amount',
					'identifier' => 'orderId',
					'cc_number' => 'creditCard["number"]',
					'cc_exp' => 'creditCard["expirationDate"]',
					'cc_code' => 'creditCard["cvv"]',
					'first_name' => 'billing["firstName"]',
					'last_name' => 'billing["lastName"]',
					'street' => 'billing["streetAddress"]',
					'street2' => 'billing["extendedAddress"]',
					'postal_code' => 'billing["postalCode"]',
					'state' => 'billing["region"]',
					'country' => 'billing["countryCodeAlpha2"]',
					'city' => 'billing["locality"]',
					'ship_to_first_name' => 'shipping["firstName"]',
					'ship_to_last_name' => 'shipping["lastName"]',
					'ship_to_company' => 'shipping["company"]',
					'ship_to_street' => 'shipping["streetAddress"]',
					'ship_to_city' => 'shipping["locality"]',
					'ship_to_state' => 'shipping["state"]',
					'ship_to_postal_code' => 'shipping["postalCode"]',
					'ship_to_country' => 'shipping["countryCodeAlpha2"]'
				),
				'static' => array(
					'options' => array(
						'submitForSettlement' => false
					)
				)
			),
			'capture_payment' => array(
				'api' => 'Braintree_Transaction',
				'method' => 'submitForSettlement',
				'required' => array(
					'identifier'
				),
				'keymatch' => array(
					'identifier' => 'id'
				)
			),
			'get_transaction_details' => array(
				'api' => 'Braintree_Transaction',
				'method' => 'find',
				'required' => array(
					'identifier'
				),
				'keymatch' => array(
					'identifier' => 'id'
				)
			),
			'refund_payment' => array(
				'api' => 'Braintree_Transaction',
				'method' => 'refund',
				'required' => array(
					'identifier'
				),
				'keymatch' => array(
					'identifier' => 'id',
					'amt' => 'amount'
				)
			),
		);
		return $map;
	}

	/**
	 * Builds the Request
	 */
	protected function _build_request($params)
	{	
		$api = $this->_api;

		$method = $this->_api_method;
		
		$params_ready = $this->_match_params($params);

		//Now we have what we need to build the request
		return array($api, $method, $params_ready);
	}

	/**
	 * Match the Params
	 */
	private function _match_params($params)
	{
		$map = $this->method_map();
		$l = $this->_lib_method;
		$params_ready = array();

		$matcher = $map[$l]['keymatch'];
		foreach($params as $k=>$v)
		{
			if(isset($matcher[$k]))
			{
				if(strpos($matcher[$k], '["') !== false)
				{
					$ex = explode('["', $matcher[$k]);
					$arr = $ex[0];
					$arrk = str_replace('"]', '', $ex[1]);

					if(!isset($params_ready[$arr])) $params_ready[$arr] = array();
				
					if($k === 'cc_exp')
					{
						$d_mm = substr($v, 0, 2);
						$d_yyyy = substr($v, 2, 4);

						$params_ready[$arr][$arrk] = $d_mm.'/'.$d_yyyy; //set the date
					}
					else
					{
						$params_ready[$arr][$arrk] = $v;
					}
				}
				else
				{
					$key = $matcher[$k];
					$val = $v;

					$params_ready[$key] = $val;
				}
			}
			else
			{
				error_log("$k is not a valid param for this method in this driver");
			}
		}

		if(isset($map[$l]['static']))
		{
			$static = $map[$l]['static'];

			foreach($static as $k=>$v)
			{
				$params_ready[$k] = $v;
			}
		}

		return $params_ready;
	}

	/**
	 * Parse the response from the server
	 *
	 * @param	array
	 * @return	object
	 */		
	protected function _parse_response($response)
	{
		$details = (object) array();

		if(isset($response->transaction->id)) $details->identifier = $response->transaction->id;

		$details->timestamp = $response->created;
		$details->gateway_response = $response;

		if(isset($response->transaction->processorResponseText)) $details->reason = $response->transaction->processorResponseText;

		$indicator = ($response->success === true) ? 'success' : 'failure';
		return Payment_Response::instance()->gateway_response(
			$indicator,
			$this->_lib_method.'_'.$indicator,
			$details
		);
	}
}