<?php
/**
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */

namespace ZendDiagnostics\Check;

use InvalidArgumentException;
use Traversable;
use ZendDiagnostics\Result\Failure;
use ZendDiagnostics\Result\Success;

/**
 * Validate PHP version.
 *
 * This test accepts a single version and an operator or an array of
 * versions to test for.
 */
class PhpVersion extends AbstractCheck implements CheckInterface
{
    /**
     * @var string
     */
    protected $version;

    /**
     * @var string
     */
    protected $operator = '>=';

    /**
     *
     * @param  string|array|Traversable $expectedVersion The expected version
     * @param  string                   $operator        One of: <, lt, <=, le, >, gt, >=, ge, ==, =, eq, !=, <>, ne
     * @throws InvalidArgumentException
     */
    public function __construct($expectedVersion, $operator = '>=')
    {
        if (is_object($expectedVersion)) {
            if (!$expectedVersion instanceof \Traversable) {
                throw new InvalidArgumentException(
                    'Expected version number as string, array or traversable, got ' . get_class($expectedVersion)
                );
            }
            $this->version = $expectedVersion;

        } elseif (!is_scalar($expectedVersion)) {
            if (!is_array($expectedVersion)) {
                throw new InvalidArgumentException(
                    'Expected version number as string, array or traversable, got ' . gettype($expectedVersion)
                );
            }

            $this->version = $expectedVersion;

        } else {
            $this->version = array($expectedVersion);
        }

        if (!is_scalar($operator)) {
            throw new InvalidArgumentException(
                'Expected comparison operator as a string, got ' . gettype($operator)
            );
        }

        if (!in_array($operator, array(
            '<', 'lt', '<=', 'le', '>', 'gt', '>=', 'ge', '==', '=', 'eq', '!=', '<>', 'ne'
        ))) {
            throw new InvalidArgumentException(
                'Unknown comparison operator ' . $operator
            );
        }

        $this->operator = $operator;
    }

    /**
     * Perform the check
     *
     * @see \ZendDiagnostics\Check\CheckInterface::check()
     * @return Success|Failure
     */
    public function check()
    {
        foreach ($this->version as $version) {
            if (!version_compare(PHP_VERSION, $version, $this->operator)) {
                return new Failure(sprintf(
                    'Current PHP version is %s, expected %s %s',
                    PHP_VERSION,
                    $this->operator,
                    $version
                ), PHP_VERSION);
            }
        }

        return new Success('Current PHP version is ' . PHP_VERSION, PHP_VERSION);
    }
}