class LanguageNegotiation

class LanguageNegotiation extends ProcessPluginBase {
    
    /**
     * {@inheritdoc}
     */
    public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
        $new_value = [
            'enabled' => [],
            'method_weights' => [],
        ];
        if (!is_array($value)) {
            throw new MigrateException('The input should be an array');
        }
        // If no weights are provided, use the keys by flipping the array.
        if (empty($value[1])) {
            $new_value['enabled'] = array_flip(array_map([
                $this,
                'mapNewMethods',
            ], array_keys($value[0])));
            unset($new_value['method_weights']);
        }
        else {
            foreach ($value[1] as $method => $weight) {
                $new_method = $this->mapNewMethods($method);
                $new_value['method_weights'][$new_method] = $weight;
                if (in_array($method, array_keys($value[0]))) {
                    $new_value['enabled'][$new_method] = $weight;
                }
            }
        }
        return $new_value;
    }
    
    /**
     * Maps old negotiation method names to the new ones.
     *
     * @param string $value
     *   The old negotiation method name.
     *
     * @return string
     *   The new negotiation method name.
     */
    protected function mapNewMethods($value) {
        switch ($value) {
            case 'language-default':
                return 'language-selected';
            case 'locale-browser':
                return 'language-browser';
            case 'locale-interface':
                return 'language-interface';
            case 'locale-session':
                return 'language-session';
            case 'locale-url':
                return 'language-url';
            case 'locale-url-fallback':
                return 'language-url-fallback';
            case 'locale-user':
                return 'language-user';
            default:
                return $value;
        }
    }

}