using System;
using RStein.Posterous.API;
using RStein.PosterousReader.Common;
using RStein.PosterousReader.WP.HostServices;
using System.Windows.Input;

namespace RStein.PosterousReader.WP.ViewModels
{
  public class LoginViewModel :  PosterousViewModelBase
  {
    private string m_userPassword;
    private string m_userName;
    private ICommand m_loginCommand;

    public LoginViewModel(IPosterousApplication posterousApplication, INavigationService navigationService)
                         : base(posterousApplication, navigationService, String.Empty)
    {

      m_loginCommand = new DelegateCommand<Object>(handleLogin,
                                                     (_) => ValidateData());

      TextChangedAction = () => RaisePropertyChangedEvent(() => LoginCommand);

    }


    public Action TextChangedAction
    {
      get;
      private set;
    }


    public ICommand LoginCommand
    {
      get
      {
        return m_loginCommand;
      }
    }


    public virtual string UserName
    {
      get
      {
        return m_userName;
      }

      set
      {
        m_userName = value;
        RaisePropertyChangedEvent(() => UserName);
      }
    }



    public virtual string UserPassword
    {
      get
      {
        return m_userPassword;
      }

      set
      {
        m_userPassword = value;
        RaisePropertyChangedEvent(() => UserPassword);
      }
    }


    public override bool ValidateData()
    {
      return (!String.IsNullOrEmpty(UserName) &&
              (!String.IsNullOrEmpty(UserPassword)));

    }

    private void handleLogin(Object ignored)
    {
      if (!HasValidData)
      {
        return;
      }

      LastUsedUserName = UserName;
      LastUsedPassword = UserPassword;
      clearPassword();
      NavigationService.Navigate(GlobalConstants.PAGE_POST_LIST_URI);

    }

    protected override void DoInternalInit()
    {
      UserName = LastUsedUserName;
    }

    private void clearPassword()
    {
      UserPassword = String.Empty;
    }
  }
}