import type {
  PrivacyRetentionLimitPermissions,
  PrivacyRetentionPolicy,
  SystemSettingsDeltaSections,
  SystemSettingsItem
} from "../../api/admin";

const defaultAllowLowerLevelLimits: PrivacyRetentionLimitPermissions = {
  store_raw_campaign_json: true,
  raw_campaign_json_retention_days: true,
  generated_eml_retention_days: true,
  stored_report_detail_retention_days: true,
  mock_mailbox_retention_days: true,
  audit_detail_retention_days: true,
  audit_detail_level: true
};

const defaultPrivacyPolicy: PrivacyRetentionPolicy = {
  store_raw_campaign_json: true,
  raw_campaign_json_retention_days: null,
  generated_eml_retention_days: null,
  stored_report_detail_retention_days: null,
  mock_mailbox_retention_days: null,
  audit_detail_retention_days: null,
  audit_detail_level: "full",
  allow_lower_level_limits: defaultAllowLowerLevelLimits
};

export const SYSTEM_SETTINGS_FALLBACK: SystemSettingsItem = {
  default_locale: "de",
  allow_tenant_custom_groups: true,
  allow_tenant_custom_roles: true,
  allow_tenant_api_keys: true,
  privacy_retention_policy: defaultPrivacyPolicy,
  maintenance_mode: { enabled: false, message: "" },
  available_languages: [
    { code: "de", label: "German", native_label: "Deutsch" },
    { code: "en", label: "English", native_label: "English" }
  ],
  enabled_language_codes: ["de", "en"],
  settings: {},
  navigation: null,
  appearance_palette: "default",
  appearance_palette_locked: false,
  appearance_custom_overrides_allowed: false
};

export function applySystemSettingsSections(
  item: SystemSettingsItem,
  sections: SystemSettingsDeltaSections
): SystemSettingsItem {
  return {
    ...item,
    ...(sections.defaults ?? {}),
    ...(sections.tenant_capabilities ?? {}),
    ...(sections.languages ?? {}),
    ...(sections.privacy_retention_policy
      ? { privacy_retention_policy: sections.privacy_retention_policy }
      : {}),
    ...(sections.maintenance_mode ? { maintenance_mode: sections.maintenance_mode } : {}),
    ...(sections.navigation !== undefined ? { navigation: sections.navigation } : {}),
    ...(sections.appearance ?? {}),
    ...(sections.settings ? { settings: sections.settings } : {})
  };
}

export function normalizeLanguageCode(value: string): string {
  return value
    .trim()
    .toLowerCase()
    .replace(/_/g, "-")
    .split(/[^a-z0-9]+/)
    .filter(Boolean)
    .join("-");
}

export function languageOptionLabel(language: {
  code: string;
  label: string;
  native_label?: string | null;
}): string {
  return `${language.code.toUpperCase()} - ${language.native_label || language.label}`;
}