import * as plugins from './smartrouter.plugins.js';

import { QueryParams } from './smartrouter.classes.queryparams.js';

const routeLog = (message: string) => {
  console.log(`%c[Router]%c ${message}`, 'color: rgb(255, 105, 100);', 'color: inherit');
};

export interface IRouterOptions {
  debug?: boolean;
}

export type THandlerFunction = <T extends object>(routeArg: IRouteInfo) => Promise<any>;
export interface IRouteInfo {
  path: string;
  index: number;
  params: { [key: string]: string };
  queryParams: { [key: string]: string };
}

/**
 * Router
 */
export class SmartRouter {
  public options: IRouterOptions = {
    debug: false,
  };

  public queryParams = new QueryParams();

  /**
   * the routes we are handling
   */
  public routes: Array<{
    matchFunction: plugins.pathToRegExp.MatchFunction;
    handler: THandlerFunction;
  }> = [];

  /**
   * base path for this router
   */
  private basePath: string;

  /**
   * Reference to the event listener function for cleanup
   */
  private popstateListener: (event: PopStateEvent) => void;

  /**
   * Creates an instance of Router.
   */
  constructor(optionsArg: IRouterOptions, basePath: string = '') {
    // lets set the router options
    this.options = {
      ...this.options,
      ...optionsArg,
    };
    this.basePath = basePath;

    // lets subscribe to route changes
    this.popstateListener = (popStateEventArg) => {
      popStateEventArg.preventDefault();
      this._handleRouteState();
    };
    window.addEventListener('popstate', this.popstateListener);
  }

  /**
   * Create a sub-router with a specific prefix
   * @param {string} subPath
   * @param {IRouterOptions} [options]
   */
  public createSubRouter(subPath: string, options?: IRouterOptions): SmartRouter {
    const newBasePath = `${this.basePath}${subPath}`;
    return new SmartRouter({ ...this.options, ...options }, newBasePath);
  }

  /**
   * Push route state to history stack
   */
  public async pushUrl(url: string = '/', state: any = {}) {
    const fullUrl = `${this.basePath}${url}`;
    if (fullUrl !== window.location.pathname) {
      window.history.pushState(state, window.document.title, fullUrl);
    } else {
      window.history.replaceState(state, window.document.title, fullUrl);
    }
    await this._handleRouteState();
  }

  /**
   * Attach route with handler
   * @param {string|RegExp} routeArg
   * @param {function} handlerArg
   */
  public on(routeArg: string, handlerArg: THandlerFunction) {
    const fullRoute = `${this.basePath}${routeArg}`;
    const routeObject = {
      matchFunction: plugins.pathToRegExp.match(fullRoute),
      handler: handlerArg,
    };
    this.routes.push(routeObject);
    const removeFunction = () => {
      this.routes.splice(this.routes.indexOf(routeObject), 1);
    };
    return removeFunction;
  }

  /**
   * Apply routes handler to current route
   */
  async _handleRouteState() {
    const currentLocation = window.location.pathname;

    // lets find all wanted routes.
    const wantedRoutes = this.routes.filter((routeArg) => {
      return !!routeArg.matchFunction(currentLocation);
    });

    for (const wantedRoute of wantedRoutes) {
      const routeResult = wantedRoute.matchFunction(currentLocation);
      wantedRoute.handler({
        ...(routeResult.valueOf() as Object),
        queryParams: this.queryParams.getAllAsObject(), // TODO check wether entries is supported in typings
      } as IRouteInfo); // not waiting here
    }
  }

  /**
   * Destroy the router instance, removing all external references
   */
  public destroy() {
    // Remove the event listener for popstate
    window.removeEventListener('popstate', this.popstateListener);
    // Clear all routes
    this.routes = [];
  }
}