<?php

namespace Arlo;

use Arlo\Utilities;

class SystemRequirements {
	public static function get_system_requirements() {
		return [
			[
				'name' => 'Memory limit',
				'expected_value' => '64M',
				'current_value' => function () {
					return ini_get('memory_limit');
				},
				'check' => function($current_value, $expected_value) {
					return intval($current_value) >= intval($expected_value);
				}
			],
			[
				'name' => 'Max execution time',
				'expected_value' => '30',
				'current_value' => function () {
					return ini_get('max_execution_time');
				},
				'check' => function($current_value, $expected_value) {
					return intval($current_value) >= intval($expected_value);
				}
			],
			[
				'name' => 'cUrl enabled',
				'expected_value' => 'Yes',
				'current_value' => function () {
					return extension_loaded('curl') ? 'Yes': 'No';
				},
				'check' => function($current_value, $expected_value) {
					return $current_value == 'Yes';
				}
			],
			[
				'name' => 'mCrypt enabled',
				'expected_value' => 'Yes',
				'current_value' => function () {
					return extension_loaded('mcrypt') ? 'Yes': 'No';
				},
				'check' => function($current_value, $expected_value) {
					return $current_value == 'Yes';
				}
			],
			[
				'name' => 'RIJNDAEL 128 available',
				'expected_value' => 'Yes',
				'current_value' => function () {
					return extension_loaded('mcrypt') && in_array('rijndael-128', mcrypt_list_algorithms()) ? 'Yes' : 'No';
				},
				'check' => function($current_value, $expected_value) {
					return $current_value == 'Yes';
				}
			],
			[
				'name' => 'CBC mode available',
				'expected_value' => 'Yes',
				'current_value' => function () {
					return extension_loaded('mcrypt') && in_array('cbc', mcrypt_list_modes()) ? 'Yes' : 'No';
				},
				'check' => function($current_value, $expected_value) {
					return $current_value == 'Yes';
				}
			],
			[
				'name' => 'SHA512 available',
				'expected_value' => 'Yes',
				'current_value' => function () {
					return in_array('sha512', hash_algos()) ? 'Yes' : 'No';
				},
				'check' => function($current_value, $expected_value) {
					return $current_value == 'Yes';
				}
			]									
		];
	} 

	public static function overall_check() {
		$good = true;
		foreach (self::get_system_requirements() as $requirement) {
			$current_value = $requirement['current_value']();
			
			if ($requirement['check']($current_value, $requirement['expected_value']) === false) {
				$good = false;
				break;
			}
		}

		return $good;
	}
}