class ScaffoldOptions

class ScaffoldOptions {
    
    /**
     * The raw data from the 'extras' section of the top-level composer.json file.
     *
     * @var array
     */
    protected $options = [];
    
    /**
     * ScaffoldOptions constructor.
     *
     * @param array $options
     *   The scaffold options taken from the 'drupal-scaffold' section.
     */
    protected function __construct(array $options) {
        $this->options = $options + [
            "allowed-packages" => [],
            "locations" => [],
            "symlink" => FALSE,
            "file-mapping" => [],
        ];
        // Define any default locations.
        $this->options['locations'] += [
            'project-root' => '.',
            'web-root' => '.',
        ];
    }
    
    /**
     * Determines if the provided 'extras' section has scaffold options.
     *
     * @param array $extras
     *   The contents of the 'extras' section.
     *
     * @return bool
     *   True if scaffold options have been declared
     */
    public static function hasOptions(array $extras) {
        return array_key_exists('drupal-scaffold', $extras);
    }
    
    /**
     * Creates a scaffold options object.
     *
     * @param array $extras
     *   The contents of the 'extras' section.
     *
     * @return self
     *   The scaffold options object representing the provided scaffold options
     */
    public static function create(array $extras) {
        $options = static::hasOptions($extras) ? $extras['drupal-scaffold'] : [];
        return new self($options);
    }
    
    /**
     * Creates a new scaffold options object with some values overridden.
     *
     * @param array $options
     *   Override values.
     *
     * @return self
     *   The scaffold options object representing the provided scaffold options
     */
    protected function override(array $options) {
        return new self($options + $this->options);
    }
    
    /**
     * Creates a new scaffold options object with an overridden 'symlink' value.
     *
     * @param bool $symlink
     *   Whether symlinking should be enabled or not.
     *
     * @return self
     *   The scaffold options object representing the provided scaffold options
     */
    public function overrideSymlink($symlink) {
        return $this->override([
            'symlink' => $symlink,
        ]);
    }
    
    /**
     * Determines whether any allowed packages were defined.
     *
     * @return bool
     *   Whether there are allowed packages
     */
    public function hasAllowedPackages() {
        return !empty($this->allowedPackages());
    }
    
    /**
     * Gets allowed packages from these options.
     *
     * @return array
     *   The list of allowed packages
     */
    public function allowedPackages() {
        return $this->options['allowed-packages'];
    }
    
    /**
     * Gets the location mapping table, e.g. 'webroot' => './'.
     *
     * @return array
     *   A map of name : location values
     */
    public function locations() {
        return $this->options['locations'];
    }
    
    /**
     * Determines whether a given named location is defined.
     *
     * @param string $name
     *   The location name to search for.
     *
     * @return bool
     *   True if the specified named location exist.
     */
    protected function hasLocation($name) {
        return array_key_exists($name, $this->locations());
    }
    
    /**
     * Gets a specific named location.
     *
     * @param string $name
     *   The name of the location to fetch.
     *
     * @return string
     *   The value of the provided named location
     */
    public function getLocation($name) {
        return $this->hasLocation($name) ? $this->locations()[$name] : FALSE;
    }
    
    /**
     * Determines if symlink mode is set.
     *
     * @return bool
     *   Whether or not 'symlink' mode
     */
    public function symlink() {
        return $this->options['symlink'];
    }
    
    /**
     * Determines if there are file mappings.
     *
     * @return bool
     *   Whether or not the scaffold options contain any file mappings
     */
    public function hasFileMapping() {
        return !empty($this->fileMapping());
    }
    
    /**
     * Returns the actual file mappings.
     *
     * @return array
     *   File mappings for just this config type.
     */
    public function fileMapping() {
        return $this->options['file-mapping'];
    }
    
    /**
     * Determines if there is defined a value for the 'gitignore' option.
     *
     * @return bool
     *   Whether or not there is a 'gitignore' option setting
     */
    public function hasGitIgnore() {
        return isset($this->options['gitignore']);
    }
    
    /**
     * Gets the value of the 'gitignore' option.
     *
     * @return bool
     *   The 'gitignore' option, or TRUE if undefined.
     */
    public function gitIgnore() {
        return $this->hasGitIgnore() ? $this->options['gitignore'] : TRUE;
    }

}