<?php
namespace ILJ\Backend;

use ILJ\Core\Options;

/**
 * Plugin Environment
 *
 * Singleton, that has information about all environment related data
 *
 * @package ILJ\Backend
 * @since   1.0.0
 */
class Environment {

	/**
	 * Instance
	 *
	 * @var   Environment
	 * @since 1.0.1
	 */
	private static $instance;

	/**
	 * Environment data
	 *
	 * @var   array
	 * @since 1.0.1
	 */
	private $environment_data;

	protected function __construct() {
		$environment_data_default = array(
			'last_version' => ILJ_VERSION,
			'linkindex'    => array(
				'last_update' => array(
					'date'     => '',
					'entries'  => '',
					'duration' => '',
				),
			),
		);

		$environment_data       = Options::getOption(Options::ILJ_OPTION_KEY_ENVIRONMENT);
		$this->environment_data = wp_parse_args($environment_data, $environment_data_default);
	}

	/**
	 * Get environment data
	 *
	 * @since  1.0.1
	 * @param  string $key The key
	 * @return string|bool
	 */
	public static function get($key) {
		self::init();
		$environment_data = self::$instance->environment_data;
		if (array_key_exists($key, $environment_data)) {
			return $environment_data[$key];
		}
		return false;
	}

	/**
	 * Update environment data
	 *
	 * @since  1.0.1
	 * @param  string $key   The key
	 * @param  mixed  $value The value
	 * @return void
	 */
	public static function update($key, $value) {
		 self::init();
		$environment_data         = self::$instance->environment_data;
		$environment_data[$key] = $value;
		Options::setOption(Options::ILJ_OPTION_KEY_ENVIRONMENT, $environment_data);
	}

	/**
	 * Init Environment- class
	 *
	 * @since  1.0.1
	 * @return void
	 */
	private static function init() {
		if (null === self::$instance) {
			self::$instance = new self();
		}
	}
}