/**
 * [Gitea #260] The fork reports what noise suppression actually runs as
 * `io.lotus.denoise_state { active, model, error? }`. Pure: the toast text for
 * a report, or undefined when what runs is what the user picked.
 */
export type DenoiseStateReport = { active?: unknown; model?: unknown; error?: unknown };

const MODEL_NAMES: Record<string, string> = {
  rnnoise: 'RNNoise',
  speex: 'Speex',
  dtln: 'DTLN',
  deepfilternet: 'DeepFilterNet 3',
};
const modelName = (m: unknown): string =>
  typeof m === 'string' ? (MODEL_NAMES[m] ?? m) : 'the selected model';

export function denoiseNotice(
  requestedModel: string,
  report: DenoiseStateReport | undefined,
): string | undefined {
  if (!report || typeof report.active !== 'boolean') return undefined;
  if (!report.active) {
    return `ML noise suppression couldn't start, so your microphone is sending unfiltered audio. You can pick another model in Settings → Calls.`;
  }
  if (typeof report.model === 'string' && report.model !== requestedModel) {
    return `${modelName(requestedModel)} couldn't start, so noise suppression is using ${modelName(report.model)} instead.`;
  }
  return undefined;
}