import i18n from "../i18n";

// A single, self-explanatory error dialog (modal) the user must acknowledge — used when the
// server can't carry out an action (a definitive 4xx/5xx response). Distinct from toasts
// (transient, e.g. connection blips) and from silent handling. Module-level so the non-React
// api layer can raise it; an <ErrorDialog> mounted at the app root renders the current one.
export interface AppError {
  title: string;
  message: string;
}

let current: AppError | null = null;
let listeners: Array<() => void> = [];
const emit = () => listeners.forEach((l) => l());

export function reportError(message?: string, title?: string): void {
  current = {
    title: title || i18n.t("errors.title"),
    message: message || i18n.t("errors.generic"),
  };
  emit();
}

export function dismissError(): void {
  current = null;
  emit();
}

export function subscribeError(listener: () => void): () => void {
  listeners.push(listener);
  return () => {
    listeners = listeners.filter((l) => l !== listener);
  };
}

export function getError(): AppError | null {
  return current;
}