/**
 * Эти функции будут работать после вызова {@link setGlobalRouter}
 * @packageDocumentation
 */

import { RouteList, Router } from './entities/Router';
import { Route } from './entities/Route';
import { RouterConfig } from './entities/RouterConfig';
import { __testResetHistoryUniqueId } from './entities/State';
import { PageParams } from './entities/Types';

let globalRouter: Router | null = null;

/**
 * @ignore
 * @param routes
 * @param config
 */
export function startGlobalRouter(routes: RouteList, config: RouterConfig | null = null): Router {
  if (globalRouter) {
    throw new Error('startGlobalRouter called twice is not allowed');
  }
  globalRouter = new Router(routes, config);
  globalRouter.start();
  return globalRouter;
}

export function getGlobalRouter(): Router {
  if (!globalRouter) {
    throw new Error('getGlobalRouter called before startGlobalRouter');
  }
  return globalRouter;
}

export function setGlobalRouter(router: Router) {
  globalRouter = router;
}

/**
 * @ignore
 */
export function dangerousResetGlobalRouterUseForTestOnly() {
  if (globalRouter) {
    globalRouter.stop();
    window.history.pushState(null, '', '');
  }
  if (window.history.state) {
    window.history.pushState(null, '', '');
  }
  __testResetHistoryUniqueId();
  globalRouter = null;
}

export function pushPage(pageId: string, params: PageParams = {}) {
  return getGlobalRouter().pushPage(pageId, params);
}

export function replacePage(pageId: string, params: PageParams = {}) {
  return getGlobalRouter().replacePage(pageId, params);
}

export function popPage() {
  return getGlobalRouter().popPage();
}

export function pushModal(modalId: string, params: PageParams = {}) {
  return getGlobalRouter().pushModal(modalId, params);
}

export function pushPopup(popupId: string, params: PageParams = {}) {
  return getGlobalRouter().pushPopup(popupId, params);
}

export function replaceModal(modalId: string, params: PageParams = {}) {
  return getGlobalRouter().replaceModal(modalId, params);
}

export function replacePopout(popupId: string, params: PageParams = {}) {
  return getGlobalRouter().replacePopup(popupId, params);
}

export function popPageTo(x: number|string) {
  return getGlobalRouter().popPageTo(x);
}

/**
 * @deprecated use popPageIfHasOverlay
 */
export function popPageIfModalOrPopup() {
  return getGlobalRouter().popPageIfModalOrPopup();
}

export function popPageIfHasOverlay() {
  return getGlobalRouter().popPageIfHasOverlay();
}

export function pushPageAfterPreviews(prevPageId: string, pageId: string, params: PageParams = {}) {
  return getGlobalRouter().pushPageAfterPreviews(prevPageId, pageId, params);
}

/**
 * @deprecated getCurrentStateOrDef
 * @ignore
 */
export function getCurrentRouterState() {
  return getCurrentStateOrDef();
}

export function getCurrentStateOrDef() {
  return getGlobalRouter().getCurrentStateOrDef();
}

/**
 * @deprecated getCurrentRouteOrDef
 * @ignore
 */
export function getCurrentRoute(): Route {
  return getCurrentRouteOrDef();
}

export function getCurrentRouteOrDef() {
  return getGlobalRouter().getCurrentRouteOrDef();
}

export function isInfinityPanel(panelId: string): boolean {
  // see Route.getPanelId
  return !!panelId && panelId.startsWith('_');
}

export function getInfinityPanelId(panelId: string) {
  // see Route.getPanelId
  return (panelId.split('..').shift() || '').replace('_', '');
}