<?php declare(strict_types=1);

/*
 * 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;
use Composer\Repository\RepositorySet;

/**
 * @author Nils Adermann <naderman@naderman.de>
 *
 * @method self::ERROR_DEPENDENCY_RESOLUTION_FAILED getCode()
 */
class SolverProblemsException extends \RuntimeException
{
    public const ERROR_DEPENDENCY_RESOLUTION_FAILED = 2;

    /** @var Problem[] */
    protected $problems;
    /** @var array<Rule[]> */
    protected $learnedPool;

    /**
     * @param Problem[] $problems
     * @param array<Rule[]> $learnedPool
     */
    public function __construct(array $problems, array $learnedPool)
    {
        $this->problems = $problems;
        $this->learnedPool = $learnedPool;

        parent::__construct('Failed resolving dependencies with '.count($problems).' problems, call getPrettyString to get formatted details', self::ERROR_DEPENDENCY_RESOLUTION_FAILED);
    }

    /**
     * @param bool $isVerbose
     * @param bool $isDevExtraction
     * @return string
     */
    public function getPrettyString(RepositorySet $repositorySet, Request $request, Pool $pool, bool $isVerbose, bool $isDevExtraction = false): string
    {
        $installedMap = $request->getPresentMap(true);
        $missingExtensions = array();
        $isCausedByLock = false;

        $problems = array();
        foreach ($this->problems as $problem) {
            $problems[] = $problem->getPrettyString($repositorySet, $request, $pool, $isVerbose, $installedMap, $this->learnedPool)."\n";

            $missingExtensions = array_merge($missingExtensions, $this->getExtensionProblems($problem->getReasons()));

            $isCausedByLock = $isCausedByLock || $problem->isCausedByLock($repositorySet, $request, $pool);
        }

        $i = 1;
        $text = "\n";
        foreach (array_unique($problems) as $problem) {
            $text .= "  Problem ".($i++).$problem;
        }

        $hints = array();
        if (!$isDevExtraction && (strpos($text, 'could not be found') || strpos($text, 'no matching package found'))) {
            $hints[] = "Potential 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 (!empty($missingExtensions)) {
            $hints[] = $this->createExtensionHint($missingExtensions);
        }

        if ($isCausedByLock && !$isDevExtraction && !$request->getUpdateAllowTransitiveRootDependencies()) {
            $hints[] = "Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.";
        }

        if (strpos($text, 'found composer-plugin-api[2.0.0] but it does not match') && strpos($text, '- ocramius/package-versions')) {
            $hints[] = "<warning>ocramius/package-versions only provides support for Composer 2 in 1.8+, which requires PHP 7.4.</warning>\nIf you can not upgrade PHP you can require <info>composer/package-versions-deprecated</info> to resolve this with PHP 7.0+.";
        }

        if (!class_exists('PHPUnit\Framework\TestCase', false)) {
            if (strpos($text, 'found composer-plugin-api[2.0.0] but it does not match')) {
                $hints[] = "You are using Composer 2, which some of your plugins seem to be incompatible with. Make sure you update your plugins or report a plugin-issue to ask them to support Composer 2.";
            }
        }

        if ($hints) {
            $text .= "\n" . implode("\n\n", $hints);
        }

        return $text;
    }

    /**
     * @return Problem[]
     */
    public function getProblems(): array
    {
        return $this->problems;
    }

    /**
     * @param string[] $missingExtensions
     * @return string
     */
    private function createExtensionHint(array $missingExtensions): string
    {
        $paths = IniHelper::getAll();

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

        $ignoreExtensionsArguments = implode(" ", array_map(function ($extension) {
            return "--ignore-platform-req=$extension";
        }, $missingExtensions));

        $text = "To enable extensions, verify that they are enabled in your .ini files:\n    - ";
        $text .= implode("\n    - ", $paths);
        $text .= "\nYou can also run `php --ini` in a terminal to see which files are used by PHP in CLI mode.";
        $text .= "\nAlternatively, you can run Composer with `$ignoreExtensionsArguments` to temporarily ignore these required extensions.";

        return $text;
    }

    /**
     * @param Rule[][] $reasonSets
     * @return string[]
     */
    private function getExtensionProblems(array $reasonSets): array
    {
        $missingExtensions = array();
        foreach ($reasonSets as $reasonSet) {
            foreach ($reasonSet as $rule) {
                $required = $rule->getRequiredPackage();
                if (null !== $required && 0 === strpos($required, 'ext-')) {
                    $missingExtensions[$required] = 1;
                }
            }
        }

        return array_keys($missingExtensions);
    }
}