class ScaffoldFilePath

class ScaffoldFilePath {
    
    /**
     * The type of scaffold file this is,'autoload', 'dest' or 'src'.
     *
     * @var string
     */
    protected $type;
    
    /**
     * The name of the package containing the file.
     *
     * @var string
     */
    protected $packageName;
    
    /**
     * The relative path to the file.
     *
     * @var string
     */
    protected $relativePath;
    
    /**
     * The full path to the file.
     *
     * @var string
     */
    protected $fullPath;
    
    /**
     * ScaffoldFilePath constructor.
     *
     * @param string $path_type
     *   The type of scaffold file this is,'autoload', 'dest' or 'src'.
     * @param string $package_name
     *   The name of the package containing the file.
     * @param string $rel_path
     *   The relative path to the file.
     * @param string $full_path
     *   The full path to the file.
     */
    public function __construct($path_type, $package_name, $rel_path, $full_path) {
        $this->type = $path_type;
        $this->packageName = $package_name;
        $this->relativePath = $rel_path;
        $this->fullPath = $full_path;
        // Ensure that the full path really is a full path. We do not use
        // 'realpath' here because the file specified by the full path might
        // not exist yet.
        $fs = new Filesystem();
        if (!$fs->isAbsolutePath($this->fullPath)) {
            $this->fullPath = getcwd() . '/' . $this->fullPath;
        }
    }
    
    /**
     * Gets the name of the package this source file was pulled from.
     *
     * @return string
     *   Name of package.
     */
    public function packageName() {
        return $this->packageName;
    }
    
    /**
     * Gets the relative path to the source file (best to use in messages).
     *
     * @return string
     *   Relative path to file.
     */
    public function relativePath() {
        return $this->relativePath;
    }
    
    /**
     * Gets the full path to the source file.
     *
     * @return string
     *   Full path to file.
     */
    public function fullPath() {
        return $this->fullPath;
    }
    
    /**
     * Converts the relative source path into an absolute path.
     *
     * The path returned will be relative to the package installation location.
     *
     * @param string $package_name
     *   The name of the package containing the source file. Only used for error
     *   messages.
     * @param string $package_path
     *   The installation path of the package containing the source file.
     * @param string $destination
     *   Destination location provided as a relative path. Only used for error
     *   messages.
     * @param string $source
     *   Source location provided as a relative path.
     *
     * @return self
     *   Object wrapping the relative and absolute path to the source file.
     */
    public static function sourcePath($package_name, $package_path, $destination, $source) {
        // Complain if there is no source path.
        if (empty($source)) {
            throw new \RuntimeException("No scaffold file path given for {$destination} in package {$package_name}.");
        }
        // Calculate the full path to the source scaffold file.
        $source_full_path = $package_path . '/' . $source;
        if (!file_exists($source_full_path)) {
            throw new \RuntimeException("Scaffold file {$source} not found in package {$package_name}.");
        }
        if (is_dir($source_full_path)) {
            throw new \RuntimeException("Scaffold file {$source} in package {$package_name} is a directory; only files may be scaffolded.");
        }
        return new self('src', $package_name, $source, $source_full_path);
    }
    
    /**
     * Converts the relative destination path into an absolute path.
     *
     * Any placeholders in the destination path, e.g. '[web-root]', will be
     * replaced using the provided location replacements interpolator.
     *
     * @param string $package_name
     *   The name of the package defining the destination path.
     * @param string $destination
     *   The relative path to the destination file being scaffolded.
     * @param \Drupal\Composer\Plugin\Scaffold\Interpolator $location_replacements
     *   Interpolator that includes the [web-root] and any other available
     *   placeholder replacements.
     *
     * @return self
     *   Object wrapping the relative and absolute path to the destination file.
     */
    public static function destinationPath($package_name, $destination, Interpolator $location_replacements) {
        $dest_full_path = $location_replacements->interpolate($destination);
        return new self('dest', $package_name, $destination, $dest_full_path);
    }
    
    /**
     * Adds data about the relative and full path to the provided interpolator.
     *
     * @param \Drupal\Composer\Plugin\Scaffold\Interpolator $interpolator
     *   Interpolator to add data to.
     * @param string $name_prefix
     *   (optional) Prefix to add before -rel-path and -full-path item names.
     *   Defaults to path type provided when constructing this object.
     */
    public function addInterpolationData(Interpolator $interpolator, $name_prefix = '') {
        if (empty($name_prefix)) {
            $name_prefix = $this->type;
        }
        $data = [
            'package-name' => $this->packageName(),
            "{$name_prefix}-rel-path" => $this->relativePath(),
            "{$name_prefix}-full-path" => $this->fullPath(),
        ];
        $interpolator->addData($data);
    }
    
    /**
     * Interpolate a string using the data from this scaffold file info.
     *
     * @param string $name_prefix
     *   (optional) Prefix to add before -rel-path and -full-path item names.
     *   Defaults to path type provided when constructing this object.
     *
     * @return \Drupal\Composer\Plugin\Scaffold\Interpolator
     *   An interpolator for making string replacements.
     */
    public function getInterpolator($name_prefix = '') {
        $interpolator = new Interpolator();
        $this->addInterpolationData($interpolator, $name_prefix);
        return $interpolator;
    }

}