<?php

namespace Composer\Repository;

use Composer\Config;
use Composer\EventDispatcher\EventDispatcher;
use Composer\IO\IOInterface;
use Composer\Package\PackageInterface;
use Composer\Util\HttpDownloader;
use Composer\Util\ProcessExecutor;

/**
 * Repositories manager.
 *
 * @author Jordi Boggiano <j.boggiano@seld.be>
 * @author Konstantin Kudryashov <ever.zet@gmail.com>
 * @author François Pluchino <francois.pluchino@opendisplay.com>
 */
class RepositoryManager
{
	/** @var InstalledRepositoryInterface */
	private $localRepository;

	/** @var list<RepositoryInterface> */
	private $repositories = [];

	/** @var array<string, class-string<RepositoryInterface>> */
	private $repositoryClasses = [];

	/** @var IOInterface */
	private $io;

	/** @var Config */
	private $config;

	/** @var HttpDownloader */
	private $httpDownloader;

	/** @var ?EventDispatcher */
	private $eventDispatcher;

	/** @var ProcessExecutor */
	private $process;


	public function __construct(
		IOInterface $io,
		Config $config,
		HttpDownloader $httpDownloader,
		?EventDispatcher $eventDispatcher = null,
		?ProcessExecutor $process = null,
	) {
		$this->io = $io;
		$this->config = $config;
		$this->httpDownloader = $httpDownloader;
		$this->eventDispatcher = $eventDispatcher;
		$this->process = $process ?? new ProcessExecutor($io);
	}


	/**
	 * Searches for a package by its name and version in managed repositories.
	 *
	 * @param string                                                 $name       package name
	 * @param string|\Composer\Semver\Constraint\ConstraintInterface $constraint package version or version constraint to match against
	 */
	public function findPackage(string $name, $constraint): ?PackageInterface
	{
		foreach ($this->repositories as $repository) {
		    /** @var RepositoryInterface $repository */
		    if ($package = $repository->findPackage($name, $constraint)) {
		        return $package;
		    }
		}

		return null;
	}


	/**
	 * Searches for all packages matching a name and optionally a version in managed repositories.
	 *
	 * @param string                                                 $name       package name
	 * @param string|\Composer\Semver\Constraint\ConstraintInterface $constraint package version or version constraint to match against
	 *
	 * @return PackageInterface[]
	 */
	public function findPackages(string $name, $constraint): array
	{
		$packages = [];

		foreach ($this->getRepositories() as $repository) {
		    $packages = array_merge($packages, $repository->findPackages($name, $constraint));
		}

		return $packages;
	}


	/**
	 * Adds repository
	 *
	 * @param RepositoryInterface $repository repository instance
	 */
	public function addRepository(RepositoryInterface $repository): void
	{
		$this->repositories[] = $repository;
	}


	/**
	 * Adds a repository to the beginning of the chain
	 *
	 * This is useful when injecting additional repositories that should trump Packagist, e.g. from a plugin.
	 *
	 * @param RepositoryInterface $repository repository instance
	 */
	public function prependRepository(RepositoryInterface $repository): void
	{
		array_unshift($this->repositories, $repository);
	}


	/**
	 * Returns a new repository for a specific installation type.
	 *
	 * @param  string                    $type   repository type
	 * @param  array<string, mixed>      $config repository configuration
	 * @param  string                    $name   repository name
	 * @throws \InvalidArgumentException if repository for provided type is not registered
	 */
	public function createRepository(string $type, array $config, ?string $name = null): RepositoryInterface
	{
		if (!isset($this->repositoryClasses[$type])) {
		    throw new \InvalidArgumentException('Repository type is not registered: '.$type);
		}

		if (isset($config['packagist']) && false === $config['packagist']) {
		    $this->io->writeError('<warning>Repository "'.$name.'" ('.json_encode($config).') has a packagist key which should be in its own repository definition</warning>');
		}

		$class = $this->repositoryClasses[$type];

		if (isset($config['only']) || isset($config['exclude']) || isset($config['canonical'])) {
		    $filterConfig = $config;
		    unset($config['only'], $config['exclude'], $config['canonical']);
		}

		$repository = new $class($config, $this->io, $this->config, $this->httpDownloader, $this->eventDispatcher, $this->process);

		if (isset($filterConfig)) {
		    $repository = new FilterRepository($repository, $filterConfig);
		}

		return $repository;
	}


	/**
	 * Stores repository class for a specific installation type.
	 *
	 * @param string $type  installation type
	 * @param class-string<RepositoryInterface> $class class name of the repo implementation
	 */
	public function setRepositoryClass(string $type, $class): void
	{
		$this->repositoryClasses[$type] = $class;
	}


	/**
	 * Returns all repositories, except local one.
	 *
	 * @return RepositoryInterface[]
	 */
	public function getRepositories(): array
	{
		return $this->repositories;
	}


	/**
	 * Sets local repository for the project.
	 *
	 * @param InstalledRepositoryInterface $repository repository instance
	 */
	public function setLocalRepository(InstalledRepositoryInterface $repository): void
	{
		$this->localRepository = $repository;
	}


	/**
	 * Returns local repository for the project.
	 */
	public function getLocalRepository(): InstalledRepositoryInterface
	{
		return $this->localRepository;
	}
}
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