/****************************************************************************
* Copyright 2019 Nreal Techonology Limited. All rights reserved.
*                                                                                                                                                          
* This file is part of NRSDK.                                                                                                          
*                                                                                                                                                           
* https://www.nreal.ai/        
* 
*****************************************************************************/

namespace NRKernal.Record
{
    using System;
    using UnityEngine;
    using NRKernal;

    /// <summary> A capture behaviour base. </summary>
    public class CaptureBehaviourBase : MonoBehaviour, IFrameConsumer
    {
        /// <summary> The RGB camera rig. </summary>
        [SerializeField] Transform RGBCameraRig;
        /// <summary> The capture camera. </summary>
        public Camera CaptureCamera;
        private FrameCaptureContext m_FrameCaptureContext;

        /// <summary> Gets the context. </summary>
        /// <returns> The context. </returns>
        public FrameCaptureContext GetContext()
        {
            return m_FrameCaptureContext;
        }

        /// <summary> Initializes this object. </summary>
        /// <param name="context">     The context.</param>
        /// <param name="blendCamera"> The blend camera.</param>
        public virtual void Init(FrameCaptureContext context)
        {
            this.m_FrameCaptureContext = context;
        }

        public void SetCameraMask(int mask)
        {
            CaptureCamera.cullingMask = mask;
        }

        public void SetBackGroundColor(Color color)
        {
            this.CaptureCamera.backgroundColor = color; //new Color(color.r, color.g, color.b, 0);
        }

        /// <summary> Executes the 'frame' action. </summary>
        /// <param name="frame"> The frame.</param>
        public virtual void OnFrame(UniversalTextureFrame frame)
        {
            var mode = this.GetContext().GetBlender().BlendMode;
            switch (mode)
            {
                case BlendMode.RGBOnly:
                    MoveToGod();
                    break;
                case BlendMode.Blend:
                case BlendMode.VirtualOnly:
                case BlendMode.WidescreenBlend:
                    // update camera pose
                    UpdateHeadPoseByTimestamp(frame.timeStamp);
                    break;
                default:
                    break;
            }
        }

        private void MoveToGod()
        {
            RGBCameraRig.transform.position = Vector3.one * 9999;
        }

        /// <summary> Updates the head pose by timestamp described by timestamp. </summary>
        /// <param name="timestamp"> The timestamp.</param>
        private void UpdateHeadPoseByTimestamp(UInt64 timestamp)
        {
            Pose head_pose = Pose.identity;
            var result = NRSessionManager.Instance.NRHMDPoseTracker.GetHeadPoseByTimeInUnityWorld(ref head_pose, timestamp);
            if (result)
            {
                // NRDebugger.Info("UpdateHeadPoseByTimestamp: timestamp={0}, pos={1}", timestamp, head_pose.ToString("F2"));
                RGBCameraRig.transform.position = head_pose.position;
                RGBCameraRig.transform.rotation = head_pose.rotation;
            }
        }
    }
}