class LocaleSettingsForm

class LocaleSettingsForm extends ConfigFormBase {
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'locale_translate_settings';
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getEditableConfigNames() {
        return [
            'locale.settings',
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $config = $this->config('locale.settings');
        $form['update_interval_days'] = [
            '#type' => 'radios',
            '#title' => $this->t('Check for updates'),
            '#config_target' => 'locale.settings:translation.update_interval_days',
            '#options' => [
                '0' => $this->t('Never (manually)'),
                '7' => $this->t('Weekly'),
                '30' => $this->t('Monthly'),
            ],
            '#description' => $this->t('Select how frequently you want to check for new interface translations for your currently installed modules and themes. <a href=":url">Check updates now</a>.', [
                ':url' => Url::fromRoute('locale.check_translation')->toString(),
            ]),
        ];
        if ($directory = $config->get('translation.path')) {
            $description = $this->t('Translation files are stored locally in the  %path directory. You can change this directory on the <a href=":url">File system</a> configuration page.', [
                '%path' => $directory,
                ':url' => Url::fromRoute('system.file_system_settings')->toString(),
            ]);
        }
        else {
            $description = $this->t('Translation files will not be stored locally. Change the Interface translation directory on the <a href=":url">File system configuration</a> page.', [
                ':url' => Url::fromRoute('system.file_system_settings')->toString(),
            ]);
        }
        $form['#translation_directory'] = $directory;
        $form['use_source'] = [
            '#type' => 'radios',
            '#title' => $this->t('Translation source'),
            '#config_target' => 'locale.settings:translation.use_source',
            '#options' => [
                LOCALE_TRANSLATION_USE_SOURCE_REMOTE_AND_LOCAL => $this->t('Drupal translation server and local files'),
                LOCALE_TRANSLATION_USE_SOURCE_LOCAL => $this->t('Local files only'),
            ],
            '#description' => $this->t('The source of translation files for automatic interface translation.') . ' ' . $description,
        ];
        $form['overwrite'] = [
            '#type' => 'radios',
            '#title' => $this->t('Import behavior'),
            '#options' => [
                LOCALE_TRANSLATION_OVERWRITE_NONE => $this->t("Don't overwrite existing translations."),
                LOCALE_TRANSLATION_OVERWRITE_NON_CUSTOMIZED => $this->t('Only overwrite imported translations, customized translations are kept.'),
                LOCALE_TRANSLATION_OVERWRITE_ALL => $this->t('Overwrite existing translations.'),
            ],
            '#description' => $this->t('How to treat existing translations when automatically updating the interface translations.'),
            '#config_target' => new ConfigTarget('locale.settings', [
                'translation.overwrite_customized',
                'translation.overwrite_not_customized',
            ], fromConfig: fn(bool $overwrite_customized, bool $overwrite_not_customized): string => match (TRUE) {    $overwrite_not_customized == FALSE => LOCALE_TRANSLATION_OVERWRITE_NONE,
                $overwrite_customized == TRUE => LOCALE_TRANSLATION_OVERWRITE_ALL,
                default => LOCALE_TRANSLATION_OVERWRITE_NON_CUSTOMIZED,
            
            }, toConfig: fn(string $radio_option): array => match ($radio_option) {    LOCALE_TRANSLATION_OVERWRITE_ALL => [
                    'translation.overwrite_customized' => TRUE,
                    'translation.overwrite_not_customized' => TRUE,
                ],
                LOCALE_TRANSLATION_OVERWRITE_NON_CUSTOMIZED => [
                    'translation.overwrite_customized' => FALSE,
                    'translation.overwrite_not_customized' => TRUE,
                ],
                LOCALE_TRANSLATION_OVERWRITE_NONE => [
                    'translation.overwrite_customized' => FALSE,
                    'translation.overwrite_not_customized' => FALSE,
                ],
            
            }),
        ];
        return parent::buildForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function validateForm(array &$form, FormStateInterface $form_state) {
        parent::validateForm($form, $form_state);
        if (empty($form['#translation_directory']) && $form_state->getValue('use_source') == LOCALE_TRANSLATION_USE_SOURCE_LOCAL) {
            $form_state->setErrorByName('use_source', $this->t('You have selected local translation source, but no <a href=":url">Interface translation directory</a> was configured.', [
                ':url' => Url::fromRoute('system.file_system_settings')->toString(),
            ]));
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        // Invalidate the cached translation status when the configuration setting
        // of 'use_source' changes.
        if ($form['use_source']['#default_value'] != $form_state->getValue('use_source')) {
            locale_translation_clear_status();
        }
        parent::submitForm($form, $form_state);
    }

}