/*
This file is part of Keepass2Android, Copyright 2013 Philipp Crocoll. This file is based on Keepassdroid, Copyright Brian Pellin.

  Keepass2Android is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  Keepass2Android is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with Keepass2Android.  If not, see <http://www.gnu.org/licenses/>.
  */

using System;
using Android.Content;
using Android.OS;
using Android.Preferences;
using Android.Runtime;
using Android.Views;
using AndroidX.Core.Content;
using KeePassLib.Serialization;

namespace keepass2android
{
	/// <summary>
	/// Base class for activities displaying sensitive information. 
	/// </summary>
	/// Checks in OnResume whether the timeout occured and the database must be locked/closed.
	public class LockCloseActivity : LockingActivity, ILockCloseActivity
    {
		
		//the check if the database was locked/closed can be disabled by the caller for activities
		//which may be used "outside" the database (e.g. GeneratePassword for creating a master password)
		protected const string NoLockCheck = "NO_LOCK_CHECK";

		protected IOConnectionInfo _ioc;
		private BroadcastReceiver _intentReceiver;
		private ActivityDesign _design;

		public LockCloseActivity()
		{
			_design = new ActivityDesign(this);
		}

		protected LockCloseActivity(IntPtr javaReference, JniHandleOwnership transfer)
			: base(javaReference, transfer)
		{
			_design = new ActivityDesign(this);
		}

		protected override void OnCreate(Bundle savedInstanceState)
		{
			_design.ApplyTheme();
			base.OnCreate(savedInstanceState);


		    Util.MakeSecureDisplay(this);
			

			_ioc = App.Kp2a.CurrentDb?.Ioc;

			if (Intent.GetBooleanExtra(NoLockCheck, false))
				return;

			_intentReceiver = new LockCloseActivityBroadcastReceiver(this);
			IntentFilter filter = new IntentFilter();
			filter.AddAction(Intents.DatabaseLocked);
			filter.AddAction(Intent.ActionScreenOff);
            ContextCompat.RegisterReceiver(this, _intentReceiver, filter, (int)ReceiverFlags.Exported);
		}

		protected override void OnDestroy()
		{
			if (Intent.GetBooleanExtra(NoLockCheck, false) == false)
			{
				try
				{
					UnregisterReceiver(_intentReceiver);
				}
				catch (Exception ex)
				{
					Kp2aLog.LogUnexpectedError(ex);
				}
				
			}
			

			

			base.OnDestroy();
		}


		protected override void OnResume()
		{
			base.OnResume();

			_design.ReapplyTheme();

			if (Intent.GetBooleanExtra(NoLockCheck, false))
				return;

		    if (TimeoutHelper.CheckDbChanged(this, _ioc))
		    {
		        Finish();
		        return;
		    }

		    //todo: it seems like OnResume can be called after dismissing a dialog, e.g. the Delete-permanently-Dialog.
			//in this case the following check might run in parallel with the check performed during the SaveDb check (triggered after the 
			//aforementioned dialog is closed) which can cause odd behavior. However, this is a rare case and hard to resolve so this is currently
			//accepted. (If the user clicks cancel on the reload-dialog, everything will work.)
			App.Kp2a.CheckForOpenFileChanged(this);
		}


        public void OnLockDatabase(bool lockedByTimeout)
        {
            TimeoutHelper.Lock(this, lockedByTimeout);

        }

	}

}