// Decides whether the photo-first flow can promise AI analysis.
// When it cannot, logging must still reach manual Bristol entry in one action.
const MANUAL_LABEL = 'Continue without AI';
const DISABLED_LABEL = 'Log it manually';

export function visionReadiness(status) {
  if (!status) {
    return {
      phase: 'checking',
      ready: false,
      manualOnly: true,
      manualLabel: MANUAL_LABEL,
      message: 'Checking the vision worker. Manual logging is already available.',
    };
  }
  if (status.enabled === false) {
    return {
      phase: 'disabled',
      ready: false,
      manualOnly: true,
      manualLabel: DISABLED_LABEL,
      message: 'AI photo analysis is off in this build. Manual logging is fully available.',
    };
  }
  if (status.providerReady !== true) {
    return {
      phase: 'offline',
      ready: false,
      manualOnly: true,
      manualLabel: MANUAL_LABEL,
      message: 'Vision worker offline. Manual logging is still available.',
    };
  }
  // A worker that answers /v1/models has not necessarily loaded the model yet (#15), so readiness
  // passes only once the pinned model is confirmed loaded. An unconfirmed model fails closed to the
  // manual path instead of offering an AI control that fails after the upload.
  if (status.modelSeen !== true) {
    return {
      phase: 'loading',
      ready: false,
      manualOnly: true,
      manualLabel: MANUAL_LABEL,
      message: 'The vision worker is up but the model is not loaded yet. Manual logging is available.',
    };
  }
  return { phase: 'ready', ready: true, manualOnly: false, manualLabel: '', message: '' };
}