/******************************************************************************
 * Copyright (C) Ultraleap, Inc. 2011-2021.                                   *
 *                                                                            *
 * Use subject to the terms of the Apache License 2.0 available at            *
 * http://www.apache.org/licenses/LICENSE-2.0, or another agreement           *
 * between Ultraleap and you, your company or other organization.             *
 ******************************************************************************/

using System;
using UnityEngine;

namespace Leap.Unity
{

    using TestHandPose = TestHandFactory.TestHandPose;

    /// <summary>
    /// Provides Frame object data to the Unity application by firing events as soon
    /// as Frame data is available. Frames contain all currently tracked Hands in view
    /// of the Leap Motion Controller.
    /// </summary>
    public abstract class LeapProvider : MonoBehaviour
    {

        public TestHandPose editTimePose = TestHandPose.HeadMountedB;

        public event Action<Frame> OnUpdateFrame;
        public event Action<Frame> OnFixedFrame;
        public event Action<Frame> OnPostUpdateFrame;

        /// <summary>
        /// The current frame for this update cycle, in world space. 
        /// 
        /// IMPORTANT!  This frame might be mutable!  If you hold onto a reference
        /// to this frame, or a reference to any object that is a part of this frame,
        /// it might change unexpectedly.  If you want to save a reference, make sure
        /// to make a copy.
        /// </summary>
        public abstract Frame CurrentFrame { get; }

        /// <summary>
        /// The current frame for this fixed update cycle, in world space.
        /// 
        /// IMPORTANT!  This frame might be mutable!  If you hold onto a reference
        /// to this frame, or a reference to any object that is a part of this frame,
        /// it might change unexpectedly.  If you want to save a reference, make sure
        /// to make a copy.
        /// </summary>
        public abstract Frame CurrentFixedFrame { get; }

        protected void DispatchUpdateFrameEvent(Frame frame)
        {
            if (OnUpdateFrame != null)
            {
                OnUpdateFrame(frame);
            }
            if (OnPostUpdateFrame != null)
            {
                OnPostUpdateFrame(frame);
            }
        }

        protected void DispatchFixedFrameEvent(Frame frame)
        {
            if (OnFixedFrame != null)
            {
                OnFixedFrame(frame);
            }
        }

    }

    public static class LeapProviderExtensions
    {

        public static Leap.Hand MakeTestHand(this LeapProvider provider, bool isLeft)
        {
            return TestHandFactory.MakeTestHand(isLeft, Hands.Provider.editTimePose)
                                  .Transform(UnityMatrixExtension.GetLeapMatrix(Hands.Provider.transform));
        }

    }
}