<?php

namespace Composer\DependencyResolver;

use Composer\Repository\RepositorySet;
use Composer\Util\IniHelper;

/**
 * @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);
	}


	public function getPrettyString(
		RepositorySet $repositorySet,
		Request $request,
		Pool $pool,
		bool $isVerbose,
		bool $isDevExtraction = false,
	): string {
		$installedMap = $request->getPresentMap(true);
		$missingExtensions = [];
		$isCausedByLock = false;

		$problems = [];
		foreach ($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;
		}

		$hints = [];
		if (!$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
	 */
	private function createExtensionHint(array $missingExtensions): string
	{
		$paths = IniHelper::getAll();

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

		    array_shift($paths);
		}

		$ignoreExtensionsArguments = implode(" ", array_map(static function ($extension) {
		    return "--ignore-platform-req=$extension";
		}, array_unique($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
	{
		$missingExtensions = [];
		foreach ($reasonSets as $reasonSet) {
		    foreach ($reasonSet as $rule) {
		        $required = $rule->getRequiredPackage();
		        if (null !== $required && 0 === strpos($required, 'ext-')) {
		            $missingExtensions[$required] = 1;
		        }
		    }
		}

		return array_keys($missingExtensions);
	}
}
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