<?php

namespace Composer\Package;

use Composer\Semver\Constraint\ConstraintInterface;

/**
 * Represents a link between two packages, represented by their names
 *
 * @author Nils Adermann <naderman@naderman.de>
 */
class Link
{
	public const TYPE_REQUIRE = 'requires';
	public const TYPE_DEV_REQUIRE = 'devRequires';
	public const TYPE_PROVIDE = 'provides';
	public const TYPE_CONFLICT = 'conflicts';
	public const TYPE_REPLACE = 'replaces';

	/**
	 * Special type
	 * @internal
	 */
	public const TYPE_DOES_NOT_REQUIRE = 'does not require';
	private const TYPE_UNKNOWN = 'relates to';

	/**
	 * Will be converted into a constant once the min PHP version allows this
	 *
	 * @internal
	 * @var string[]
	 * @phpstan-var array<self::TYPE_REQUIRE|self::TYPE_DEV_REQUIRE|self::TYPE_PROVIDE|self::TYPE_CONFLICT|self::TYPE_REPLACE>
	 */
	public static $TYPES = [
	    self::TYPE_REQUIRE,
	    self::TYPE_DEV_REQUIRE,
	    self::TYPE_PROVIDE,
	    self::TYPE_CONFLICT,
	    self::TYPE_REPLACE,
	];

	/** @var string */
	protected $source;

	/** @var string */
	protected $target;

	/** @var ConstraintInterface */
	protected $constraint;

	/**
	 * @var string
	 * @phpstan-var string $description
	 */
	protected $description;

	/** @var ?string */
	protected $prettyConstraint;


	/**
	 * Creates a new package link.
	 *
	 * @param ConstraintInterface $constraint       Constraint applying to the target of this link
	 * @param self::TYPE_*        $description      Used to create a descriptive string representation
	 */
	public function __construct(
		string $source,
		string $target,
		ConstraintInterface $constraint,
		$description = self::TYPE_UNKNOWN,
		?string $prettyConstraint = null,
	) {
		$this->source = strtolower($source);
		$this->target = strtolower($target);
		$this->constraint = $constraint;
		$this->description = self::TYPE_DEV_REQUIRE === $description ? 'requires (for development)' : $description;
		$this->prettyConstraint = $prettyConstraint;
	}


	public function getDescription(): string
	{
		return $this->description;
	}


	public function getSource(): string
	{
		return $this->source;
	}


	public function getTarget(): string
	{
		return $this->target;
	}


	public function getConstraint(): ConstraintInterface
	{
		return $this->constraint;
	}


	/**
	 * @throws \UnexpectedValueException If no pretty constraint was provided
	 */
	public function getPrettyConstraint(): string
	{
		if (null === $this->prettyConstraint) {
		    throw new \UnexpectedValueException(sprintf('Link %s has been misconfigured and had no prettyConstraint given.', $this));
		}

		return $this->prettyConstraint;
	}


	public function __toString(): string
	{
		return $this->source.' '.$this->description.' '.$this->target.' ('.$this->constraint.')';
	}


	public function getPrettyString(PackageInterface $sourcePackage): string
	{
		return $sourcePackage->getPrettyString().' '.$this->description.' '.$this->target.' '.$this->constraint->getPrettyString();
	}
}
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