<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/*
 * Users of PHP 5.2 should be able to run the requirements checks.
 * This is why the file and all classes must be compatible with PHP 5.2+
 * (e.g. not using namespaces and closures).
 *
 * ************** CAUTION **************
 *
 * DO NOT EDIT THIS FILE as it will be overridden by Composer as part of
 * the installation/update process. The original file resides in the
 * SensioDistributionBundle.
 *
 * ************** CAUTION **************
 */

/**
 * Represents a single PHP requirement, e.g. an installed extension.
 * It can be a mandatory requirement or an optional recommendation.
 * There is a special subclass, named PhpIniRequirement, to check a php.ini configuration.
 *
 * @author Tobias Schultze <http://tobion.de>
 */
class Requirement
{
    private $fulfilled;
    private $testMessage;
    private $helpText;
    private $helpHtml;
    private $optional;

    /**
     * Constructor that initializes the requirement.
     *
     * @param bool        $fulfilled   Whether the requirement is fulfilled
     * @param string      $testMessage The message for testing the requirement
     * @param string      $helpHtml    The help text formatted in HTML for resolving the problem
     * @param string|null $helpText    The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
     * @param bool        $optional    Whether this is only an optional recommendation not a mandatory requirement
     */
    public function __construct($fulfilled, $testMessage, $helpHtml, $helpText = null, $optional = false)
    {
        $this->fulfilled = (bool) $fulfilled;
        $this->testMessage = (string) $testMessage;
        $this->helpHtml = (string) $helpHtml;
        $this->helpText = null === $helpText ? strip_tags($this->helpHtml) : (string) $helpText;
        $this->optional = (bool) $optional;
    }

    /**
     * Returns whether the requirement is fulfilled.
     *
     * @return bool true if fulfilled, otherwise false
     */
    public function isFulfilled()
    {
        return $this->fulfilled;
    }

    /**
     * Returns the message for testing the requirement.
     *
     * @return string The test message
     */
    public function getTestMessage()
    {
        return $this->testMessage;
    }

    /**
     * Returns the help text for resolving the problem.
     *
     * @return string The help text
     */
    public function getHelpText()
    {
        return $this->helpText;
    }

    /**
     * Returns the help text formatted in HTML.
     *
     * @return string The HTML help
     */
    public function getHelpHtml()
    {
        return $this->helpHtml;
    }

    /**
     * Returns whether this is only an optional recommendation and not a mandatory requirement.
     *
     * @return bool true if optional, false if mandatory
     */
    public function isOptional()
    {
        return $this->optional;
    }
}

/**
 * Represents a PHP requirement in form of a php.ini configuration.
 *
 * @author Tobias Schultze <http://tobion.de>
 */
class PhpIniRequirement extends Requirement
{
    /**
     * Constructor that initializes the requirement.
     *
     * @param string        $cfgName           The configuration name used for ini_get()
     * @param bool|callback $evaluation        Either a boolean indicating whether the configuration should evaluate to true or false,
     *                                         or a callback function receiving the configuration value as parameter to determine the fulfillment of the requirement
     * @param bool          $approveCfgAbsence If true the Requirement will be fulfilled even if the configuration option does not exist, i.e. ini_get() returns false.
     *                                         This is helpful for abandoned configs in later PHP versions or configs of an optional extension, like Suhosin.
     *                                         Example: You require a config to be true but PHP later removes this config and defaults it to true internally.
     * @param string|null   $testMessage       The message for testing the requirement (when null and $evaluation is a boolean a default message is derived)
     * @param string|null   $helpHtml          The help text formatted in HTML for resolving the problem (when null and $evaluation is a boolean a default help is derived)
     * @param string|null   $helpText          The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
     * @param bool          $optional          Whether this is only an optional recommendation not a mandatory requirement
     */
    public function __construct($cfgName, $evaluation, $approveCfgAbsence = false, $testMessage = null, $helpHtml = null, $helpText = null, $optional = false)
    {
        $cfgValue = ini_get($cfgName);

        if (is_callable($evaluation)) {
            if (null === $testMessage || null === $helpHtml) {
                throw new InvalidArgumentException('You must provide the parameters testMessage and helpHtml for a callback evaluation.');
            }

            $fulfilled = call_user_func($evaluation, $cfgValue);
        } else {
            if (null === $testMessage) {
                $testMessage = sprintf('%s %s be %s in php.ini',
                    $cfgName,
                    $optional ? 'should' : 'must',
                    $evaluation ? 'enabled' : 'disabled'
                );
            }

            if (null === $helpHtml) {
                $helpHtml = sprintf('Set <strong>%s</strong> to <strong>%s</strong> in php.ini<a href="#phpini">*</a>.',
                    $cfgName,
                    $evaluation ? 'on' : 'off'
                );
            }

            $fulfilled = $evaluation == $cfgValue;
        }

        parent::__construct($fulfilled || ($approveCfgAbsence && false === $cfgValue), $testMessage, $helpHtml, $helpText, $optional);
    }
}

/**
 * A RequirementCollection represents a set of Requirement instances.
 *
 * @author Tobias Schultze <http://tobion.de>
 */
class RequirementCollection implements IteratorAggregate
{
    /**
     * @var Requirement[]
     */
    private $requirements = array();

    /**
     * Gets the current RequirementCollection as an Iterator.
     *
     * @return Traversable A Traversable interface
     */
    public function getIterator()
    {
        return new ArrayIterator($this->requirements);
    }

    /**
     * Adds a Requirement.
     *
     * @param Requirement $requirement A Requirement instance
     */
    public function add(Requirement $requirement)
    {
        $this->requirements[] = $requirement;
    }

    /**
     * Adds a mandatory requirement.
     *
     * @param bool        $fulfilled   Whether the requirement is fulfilled
     * @param string      $testMessage The message for testing the requirement
     * @param string      $helpHtml    The help text formatted in HTML for resolving the problem
     * @param string|null $helpText    The help text (when null, it will be inferred from $helpHtml, i.e. stripped from HTML tags)
     */
    public function addRequirement($fulfilled, $testMessage, $helpHtml, $helpText = null)
    {
        $this->add(new Requirement($fulfilled, $testMessage, $helpHtml, $helpText, false));
    }

    /**
     * Adds an optional recommendation.
     *
     * @param bool        $fulfilled   Whether the recommendation is fulfilled
     * @param string      $testMessage The message for testing the recommendation
     * @param string      $help