using Microsoft.AspNetCore.Components.Authorization;
using System.Web;
using Microsoft.Extensions.Configuration;


namespace Neighbourhood.omg.lol;

public partial class LoginWebViewPage : ContentPage
{
	private AuthenticationStateProvider AuthStateProvider { get; set; }
	private NavigatorService NavigatorService { get; set; }
	private IConfiguration Configuration { get; set; }
	private RestService api { get; set; }

	private string? client_id;
	private string? client_secret;
	private string? redirect_uri;

	public LoginWebViewPage(AuthenticationStateProvider authStateProvider, NavigatorService navigatorService, IConfiguration configuration, RestService restService)
	{
    this.AuthStateProvider = authStateProvider;
		this.NavigatorService = navigatorService;
		this.Configuration = configuration;
		this.api = restService;
		InitializeComponent();
		client_id = configuration.GetValue<string>("client_id");
		client_secret = configuration.GetValue<string>("client_secret");
		redirect_uri = configuration.GetValue<string>("redirect_uri");

		// make sure they're all not null first.
		if ( client_id != null
      && client_secret != null
      && redirect_uri != null) {
			//this.loginwebview.UserAgent = new System.Net.Http.Headers.ProductInfoHeaderValue(App.Name, App.Version).ToString();
			this.loginwebview.Source = $"https://home.omg.lol/oauth/authorize?client_id={client_id}&scope=everything&redirect_uri={redirect_uri}&response_type=code";
		}
  }

  public async void loginwebview_Navigating(object sender, WebNavigatingEventArgs e) {
    if ( client_id != null
			&& client_secret != null
			&& redirect_uri != null
			&& e.Url.StartsWith(redirect_uri)) 
		{
			Uri uri = new Uri(e.Url);
			var query = HttpUtility.ParseQueryString(uri.Query);
			string? code = query.Get("code");
			if (!string.IsNullOrEmpty(code)) {
				string? token = await api.OAuth(code, client_id, client_secret, redirect_uri);
				if (!string.IsNullOrEmpty(token)) {
					await ((CustomAuthenticationStateProvider)this.AuthStateProvider).Login(token);
					NavigatorService.NavigationManager.NavigateTo(NavigatorService.NavigationManager.Uri, forceLoad: true);
					await Shell.Current.GoToAsync("..");
        }
			}
		}
  }
}