type HttpMethod = 'GET' | 'POST'

class Router {
  private router = new Map<string, Map<HttpMethod, {handler: routeHandler, urlparams?: URLSearchParams}>>()

  private addRoute (method: HttpMethod, url: string, callback: routeHandler, urlparams?: URLSearchParams): void {
    if (!this.router.has(url)) {
      this.router.set(url, new Map())
    }
    this.router.get(url)!.set(method, { handler: callback, urlparams })
  }

  get (url: string, callback: routeHandler, urlparams?: URLSearchParams): void {
    this.addRoute('GET', url, callback, urlparams)
  }

  post (url: string, callback: routeHandler, urlparams?: URLSearchParams): void {
    this.addRoute('POST', url, callback, urlparams)
  }

  any (url: string, callback: routeHandler, urlparams?: URLSearchParams): void {
    this.addRoute('GET', url, callback, urlparams)
    this.addRoute('POST', url, callback, urlparams)
  }

  getHandler (url: string, method: HttpMethod) {
    if (this.router.has(url)) {
      const methods = this.router.get(url)!
      if (methods.has(method)) {
        return methods.get(method)
      }
    }
    return null
  }
}

export default new Router()