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<?php

namespace Drupal\Core\Extension;

use Drupal\Component\Version\Constraint;

/**
 * A value object representing dependency information.
 *
 * This class implements \ArrayAccess to provide a backwards compatibility layer
 * for Drupal 8.x. This will be removed before Drupal 9.x.
 *
 * @see https://www.drupal.org/node/2756875
 */
class Dependency implements \ArrayAccess {

  /**
   * The name of the dependency.
   *
   * @var string
   */
  protected $name;

  /**
   * The project namespace for the dependency.
   *
   * @var string
   */
  protected $project;

  /**
   * The constraint string.
   *
   * @var \Drupal\Component\Version\Constraint
   */
  protected $constraintString;

  /**
   * The Constraint object from the constraint string.
   *
   * @var \Drupal\Component\Version\Constraint
   */
  protected $constraint;

  /**
   * Dependency constructor.
   *
   * @param string $name
   *   The name of the dependency.
   * @param string $project
   *   The project namespace for the dependency.
   * @param string $constraint
   *   The constraint string. For example, '>8.x-1.1'.
   */
  public function __construct($name, $project, $constraint) {
    $this->name = $name;
    $this->project = $project;
    $this->constraintString = $constraint;
  }

  /**
   * Gets the dependency's name.
   *
   * @return string
   *   The dependency's name.
   */
  public function getName() {
    return $this->name;
  }

  /**
   * Gets the dependency's project namespace.
   *
   * @return string
   *   The dependency's project namespace.
   */
  public function getProject() {
    return $this->project;
  }

  /**
   * Gets constraint string from the dependency.
   *
   * @return string
   *   The constraint string.
   */
  public function getConstraintString() {
    return $this->constraintString;
  }

  /**
   * Gets the Constraint object.
   *
   * @return \Drupal\Component\Version\Constraint
   *   The Constraint object.
   */
  protected function getConstraint() {
    if (!$this->constraint) {
      $this->constraint = new Constraint($this->constraintString, \Drupal::CORE_COMPATIBILITY);
    }
    return $this->constraint;
  }

  /**
   * Determines if the provided version is compatible with this dependency.
   *
   * @param string $version
   *   The version to check, for example '4.2'.
   *
   * @return bool
   *   TRUE if compatible with the provided version, FALSE if not.
   */
  public function isCompatible($version) {
    return $this->getConstraint()->isCompatible($version);
  }

  /**
   * {@inheritdoc}
   */
  public function offsetExists($offset) {
    @trigger_error(sprintf('Array access to %s properties is deprecated. Use accessor methods instead. See https://www.drupal.org/node/2756875', __CLASS__), E_USER_DEPRECATED);
    return in_array($offset, ['name', 'project', 'original_version', 'versions'], TRUE);
  }

  /**
   * {@inheritdoc}
   */
  public function offsetGet($offset) {
    switch ($offset) {
      case 'name':
        @trigger_error(sprintf('Array access to the %s name property is deprecated. Use %s::getName() instead. See https://www.drupal.org/node/2756875', __CLASS__, __CLASS__), E_USER_DEPRECATED);
        return $this->getName();

      case 'project':
        @trigger_error(sprintf('Array access to the %s project property is deprecated. Use %s::getProject() instead. See https://www.drupal.org/node/2756875', __CLASS__, __CLASS__), E_USER_DEPRECATED);
        return $this->getProject();

      case 'original_version':
        @trigger_error(sprintf('Array access to the %s original_version property is deprecated. Use %s::getConstraintString() instead. See https://www.drupal.org/node/2756875', __CLASS__, __CLASS__), E_USER_DEPRECATED);
        $constraint = $this->getConstraintString();
        if ($constraint) {
          $constraint = ' (' . $constraint . ')';
        }
        return $constraint;

      case 'versions':
        @trigger_error(sprintf('Array access to the %s versions property is deprecated. See https://www.drupal.org/node/2756875', __CLASS__), E_USER_DEPRECATED);
        return $this->getConstraint()->toArray();
    }
    throw new \InvalidArgumentException("The $offset key is not supported");
  }

  /**
   * {@inheritdoc}
   */
  public function offsetSet($offset, $value) {
    throw new \BadMethodCallException(sprintf('%s() is not supported', __METHOD__));
  }

  /**
   * {@inheritdoc}
   */
  public function offsetUnset($offset) {
    throw new \BadMethodCallException(sprintf('%s() is not supported', __METHOD__));
  }

  /**
   * Creates a new instance of this class from a dependency string.
   *
   * @param string $dependency
   *   A dependency string, which specifies a module or theme dependency, and
   *   optionally the project it comes from and a constraint string that
   *   determines the versions that are supported. Supported formats include:
   *   - 'module'
   *   - 'project:module'
   *   - 'project:module (>=version, <=version)'.
   *
   * @return static
   */
  public static function createFromString($dependency) {
    if (strpos($dependency, ':') !== FALSE) {
      list($project, $dependency) = explode(':', $dependency);
    }
    else {
      $project = '';
    }
    $parts = explode('(', $dependency, 2);
    $name = trim($parts[0]);
    $version_string = isset($parts[1]) ? rtrim($parts[1], ") ") : '';
    return new static($name, $project, $version_string);
  }

  /**
   * Prevents unnecessary serialization of constraint objects.
   *
   * @return array
   *   The properties to seriailize.
   */
  public function __sleep() {
    return ['name', 'project', 'constraintString'];
  }

}