import { Injectable } from '@angular/core'
import { Router } from '@angular/router'
import { ServerService } from '../server'

@Injectable()
export class RedirectService {
  // Default route could change according to the instance configuration
  static INIT_DEFAULT_ROUTE = '/videos/trending'
  static DEFAULT_ROUTE = RedirectService.INIT_DEFAULT_ROUTE

  constructor (
    private router: Router,
    private serverService: ServerService
  ) {
    // The config is first loaded from the cache so try to get the default route
    const config = this.serverService.getConfig()
    if (config && config.instance && config.instance.defaultClientRoute) {
      RedirectService.DEFAULT_ROUTE = config.instance.defaultClientRoute
    }

    this.serverService.configLoaded
      .subscribe(() => {
        const defaultRouteConfig = this.serverService.getConfig().instance.defaultClientRoute

        if (defaultRouteConfig) {
          RedirectService.DEFAULT_ROUTE = defaultRouteConfig
        }
      })
  }

  redirectToHomepage () {
    console.log('Redirecting to %s...', RedirectService.DEFAULT_ROUTE)

    this.router.navigate([ RedirectService.DEFAULT_ROUTE ], { replaceUrl: true })
      .catch(() => {
        console.error(
          'Cannot navigate to %s, resetting default route to %s.',
          RedirectService.DEFAULT_ROUTE,
          RedirectService.INIT_DEFAULT_ROUTE
        )

        RedirectService.DEFAULT_ROUTE = RedirectService.INIT_DEFAULT_ROUTE
        return this.router.navigate([ RedirectService.DEFAULT_ROUTE ], { replaceUrl: true })
      })

  }

}