/**
 * Form model of the general + quota cards on the admin settings page.
 *
 * Field names MUST NOT contain dots: react-hook-form treats a dot in a
 * field name as a nested-path separator. A field registered under its
 * settings key ('instance.name') DISPLAYS fine — RHF's getter falls back
 * to the literal flat key — but typing writes the value into a nested
 * object ({ instance: { name } }), which the api's strict PATCH schema
 * rejects, so nothing ever saved (issue #322). This mapping is the single
 * place tying a dot-free field name to its dotted settings key; the
 * converters below translate in both directions.
 */

export const GENERAL_FORM_FIELDS = {
  instanceName: 'instance.name',
  defaultLocale: 'instance.defaultLocale',
  registrationMode: 'auth.registrationMode',
  invitationsMaxOpenPerUser: 'invitations.maxOpenPerUser',
  newPageClassification: 'classification.newPageDefault',
  uploadPolicy: 'classification.uploadPolicy',
  quotaEditorsPerPond: 'quota.editorsPerPond',
  quotaReadersPerPond: 'quota.readersPerPond',
  quotaAdditionalPonds: 'quota.additionalPonds',
  quotaStorageBytes: 'quota.storageBytes',
  quotaMaxFileBytes: 'quota.maxFileBytes',
} as const;

export type GeneralFormField = keyof typeof GENERAL_FORM_FIELDS;
export type GeneralFormSettingKey = (typeof GENERAL_FORM_FIELDS)[GeneralFormField];

export interface GeneralSettingsForm {
  instanceName: string;
  defaultLocale: 'de' | 'en';
  registrationMode: 'open' | 'closed';
  invitationsMaxOpenPerUser: number;
  newPageClassification: 'unclassified' | 'vs_nfd';
  uploadPolicy: 'warn' | 'block';
  quotaEditorsPerPond: number;
  quotaReadersPerPond: number;
  quotaAdditionalPonds: number;
  quotaStorageBytes: number;
  quotaMaxFileBytes: number;
}

/** The settings this form reads and writes, keyed by their dotted names. */
export type GeneralFormSettings = Record<GeneralFormSettingKey, unknown>;

export function toFormValues(settings: GeneralFormSettings): GeneralSettingsForm {
  return Object.fromEntries(
    Object.entries(GENERAL_FORM_FIELDS).map(([field, key]) => [field, settings[key]]),
  ) as unknown as GeneralSettingsForm;
}

/** Flat dotted keys, exactly what PATCH /admin/settings expects. */
export function toSettingsPatch(input: GeneralSettingsForm): GeneralFormSettings {
  return Object.fromEntries(
    Object.entries(GENERAL_FORM_FIELDS).map(([field, key]) => [
      key,
      input[field as GeneralFormField],
    ]),
  ) as GeneralFormSettings;
}