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Filename : SolverProblemsException.php
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<?php

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Composer\DependencyResolver;

use Composer\Util\IniHelper;

/**
 * @author Nils Adermann <naderman@naderman.de>
 */
class SolverProblemsException extends \RuntimeException
{
    protected $problems;
    protected $installedMap;

    public function __construct(array $problems, array $installedMap)
    {
        $this->problems = $problems;
        $this->installedMap = $installedMap;

        parent::__construct($this->createMessage(), 2);
    }

    protected function createMessage()
    {
        $text = "\n";
        $hasExtensionProblems = false;
        foreach ($this->problems as $i => $problem) {
            $text .= "  Problem ".($i + 1).$problem->getPrettyString($this->installedMap)."\n";

            if (!$hasExtensionProblems && $this->hasExtensionProblems($problem->getReasons())) {
                $hasExtensionProblems = true;
            }
        }

        if (strpos($text, 'could not be found') || strpos($text, 'no matching package found')) {
            $text .= "\nPotential causes:\n - A typo in the package name\n - The package is not available in a stable-enough version according to your minimum-stability setting\n   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.\n - It's a private package and you forgot to add a custom repository to find it\n\nRead <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.";
        }

        if ($hasExtensionProblems) {
            $text .= $this->createExtensionHint();
        }

        return $text;
    }

    public function getProblems()
    {
        return $this->problems;
    }

    private function createExtensionHint()
    {
        $paths = IniHelper::getAll();

        if (count($paths) === 1 && empty($paths[0])) {
            return '';
        }

        $text = "\n  To enable extensions, verify that they are enabled in your .ini files:\n    - ";
        $text .= implode("\n    - ", $paths);
        $text .= "\n  You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.";

        return $text;
    }

    private function hasExtensionProblems(array $reasonSets)
    {
        foreach ($reasonSets as $reasonSet) {
            foreach ($reasonSet as $reason) {
                if (isset($reason["rule"]) && 0 === strpos($reason["rule"]->getRequiredPackage(), 'ext-')) {
                    return true;
                }
            }
        }

        return false;
    }
}