<?php
namespace SparkPost;

class SparkPost {

	private static $config;
	private static $defaults = array(
			'host'=>'api.sparkpost.com',
			'protocol'=>'https',
			'port'=>443,
			'strictSSL'=>true,
			'key'=>'',
			'version'=>'v1'
		);

	/**
	 * Enforce that this object can't be instansiated
	 */
	private function __construct(){}

	/**
	 * Allows the user to pass in values to override the defaults and set their API key
	 * @param String | Array $config - if a string it is an api key
   *     If an array, is should contain config values for the SDK to connect to SparkPost
	 * @throws \Exception
	 */
	public static function setConfig($config) {
    // if the config map is a string we should assume that its an api key
    if (gettype($config) === 'string') {
      $config = ['key'=>$config];
    }

		//check for API key because its required
		if (isset($config['key'])){
			$key = trim($config['key']);
			if(empty($key)){
				throw new \Exception('You must provide an API key');
			}
		} else {
			throw new \Exception('You must provide an API key');
		}
		self::$config = self::$defaults;
		foreach ($config as $configOption => $configValue) {
			if(key_exists($configOption, self::$config)) {
				self::$config[$configOption] = $configValue;
			}
		}
	}

	/**
	 * Retrieves the configuration that was previously setup by the user
	 * @throws \Exception
	 */
	public static function getConfig() {
		if (self::$config === null) {
			throw new \Exception('No configuration has been provided');
		}
		return self::$config;
	}

	public static function unsetConfig() {
		self::$config = NULL;
	}
}

?>