export interface AppConfig {
  baseRoot: string;
  baseDashboard: string;
  baseAuth: string;
  baseApi: string;
  view: 'selection' | 'dashboard';
  initialGuildId?: string;
  isAdmin?: boolean;
  userLabel?: string;
}

export interface AppState {
  guildId?: string;
  isAdmin?: boolean;
  userLabel?: string;
}

type Listener = (state: AppState) => void;

let config: AppConfig | null = null;
let state: AppState = {};
const listeners = new Set<Listener>();

export function initConfig(next: AppConfig) {
  config = next;
  state = {
    guildId: next.initialGuildId,
    isAdmin: next.isAdmin,
    userLabel: next.userLabel
  };
}

export function getConfig() {
  return config;
}

export function getState() {
  return state;
}

export function setState(partial: Partial<AppState>) {
  state = { ...state, ...partial };
  listeners.forEach((l) => l(state));
}

export function subscribe(listener: Listener) {
  listeners.add(listener);
  return () => listeners.delete(listener);
}