using System.Text;
using System;
using UnityEngine;
using UnityEngine.EventSystems;
using Rokid.UXR.Module;
using Rokid.UXR.Utility;

namespace Rokid.UXR.Interaction
{

    #region  Data

    /// <summary>
    ///  Types of Gesture Interaction
    /// </summary>
    public enum InteractorType
    {
        None,

        //near-field interaction
        Near,
        //far-field interaction
        Far
    }

    /// <summary>
    /// Hand bone node marker index
    /// </summary>
    public enum SkeletonIndexFlag
    {
        WRIST = 0,

        THUMB_CMC = 1,
        THUMB_MCP = 2,
        THUMB_IP = 3,
        THUMB_TIP = 4,

        INDEX_FINGER_MCP = 5,
        INDEX_FINGER_PIP = 6,
        INDEX_FINGER_DIP = 7,
        INDEX_FINGER_TIP = 8,

        MIDDLE_FINGER_MCP = 9,
        MIDDLE_FINGER_PIP = 10,
        MIDDLE_FINGER_DIP = 11,
        MIDDLE_FINGER_TIP = 12,

        RING_FINGER_MCP = 13,
        RING_FINGER_PIP = 14,
        RING_FINGER_DIP = 15,
        RING_FINGER_TIP = 16,

        PINKY_MCP = 17,
        PINKY_PIP = 18,
        PINKY_DIP = 19,
        PINKY_TIP = 20
    }

    /// <summary>
    /// Gesture data class
    /// </summary>
    [Serializable]
    public class Gesture
    {
        /// <summary>
        /// Types of hands
        /// </summary>
        public HandType handType;
        /// <summary>
        /// Types of gestures
        /// </summary>
        public GestureType gesType;
        /// <summary>
        /// Pressed in a certain frame
        /// </summary>
        public bool handDown;
        /// <summary>
        /// Released in a certain frame
        /// </summary>
        public bool handUp;
        /// <summary>
        /// Hand is Click
        /// </summary>
        public bool handClick;
        /// <summary>
        /// Hand is Pressing
        /// </summary>
        public bool handPress;
        /// <summary>
        ///  Hand is tracking succcess
        /// </summary>
        public bool trackingSuccess;
        /// <summary>
        /// Hand Center Position
        /// </summary>
        public Vector3 position;
        /// <summary>
        /// Hand delta position
        /// </summary>
        public Vector3 deltaPos;
        /// <summary>
        /// Hand orientation
        /// </summary>
        public HandOrientation handOrientation;
        public void Reset()
        {
            gesType = GestureType.None;
            handDown = false;
            handUp = false;
            handClick = false;
            handPress = false;
        }
        public Gesture(HandType type)
        {
            this.handType = type;
        }

        public override string ToString()
        {
            StringBuilder builder = new StringBuilder();
            builder.Append("HandType:").Append(handType.ToString())
            .Append(" GesType:").Append(gesType.ToString())
            .Append(" HandDown:").Append(handDown)
            .Append(" HandUp:").Append(handUp)
            .Append(" HandClick:").Append(handClick)
            .Append(" HandPress:").Append(handPress)
            .Append(" HandOrientation:").Append(handOrientation)
            .Append(" Position:").Append(position)
            .Append(" deltaPos:").Append(deltaPos);
            return builder.ToString();
        }
    }


    /// <summary>
    /// Types of gestures
    /// </summary>
    public enum GestureType
    {
        None = -1,
        Grip = 1,
        Palm = 2,
        Pinch = 3,
        OpenPinch = 4,
    }

    /// <summary>
    /// Types of hands
    /// </summary>
    public enum HandType
    {
        None = 0,

        LeftHand = 2,

        RightHand = 1
    }

    /// <summary>
    /// Types of handoientation
    /// </summary>
    public enum HandOrientation
    {
        None = -1,
        Palm = 0,
        Back = 1
    }

    /// <summary>
    /// NormalHand / HeadHand
    /// </summary>
    public enum HandOrHeadHandType
    {
        NormalHand,
        HeadHand
    }
    #endregion

    /// <summary>
    /// Gesture event input, provide all gesture external interface
    /// </summary>

    public class GesEventInput : MonoSingleton<GesEventInput>, IEventInput
    {
        #region  Event
        /// <summary>
        /// Hand click callback
        /// </summary>
        /// <typeparam  HandType >Hand type</typeparam>
        public static Action<HandType> OnGesClick;
        /// <summary>
        /// hand press callback
        /// </summary>
        /// <typeparam  HandType >Hand type</typeparam>
        public static Action<HandType> OnHandPress;
        /// <summary>
        /// Hand release callback
        /// </summary>
        /// <typeparam  HandType >Hand type</typeparam>
        public static Action<HandType> OnHandRelease;
        /// <summary>
        /// Gesture tracked failed callback
        /// </summary>
        /// <typeparam  HandType >handtype=leftHand lefthand lost, handtype=rightHand righthand lost</typeparam>
        public static Action<HandType> OnTrackedFailed;
        /// <summary>
        /// Hand track success callback update invoke
        /// </summary> 
        /// <typeparam  HandType >hand type</typeparam>
        public static Action<HandType> OnTrackedSuccess;
        /// <summary>
        ///  Process Gesture Data 
        /// </summary>
        /// <typeparam  GestureResults >The result of the gesture data returned </typeparam>
        public static Action<HandType, GestureBean> OnProcessGesData;
        /// <summary>
        /// Use log ges fps
        /// </summary>
        /// <typeparam  Vector3 >wrist pos</typeparam>
        public static Action<float> OnGesDataUpdate;
        /// <summary>
        /// Use to proceess ges log
        /// </summary>
        /// <typeparam  float >The time difference between the upper and lower frames of the gesture</typeparam>
        public static Action<string> OnLogGesData;

        /// <summary>
        /// Use to process ray pose
        /// </summary>
        /// <typeparam  HandType >Hand type lefthand/righthand</typeparam>
        /// <typeparam  Vector3 >Wrist pos</typeparam>
        /// <typeparam  Vector3 >Handcenter pos</typeparam>
        /// <typeparam  Vector3 >Pinchcenter base pos</typeparam>
        /// <typeparam  Vector3 >Pinchcenter  pos</typeparam>
        public static Action<HandType, Vector3, Vector3, Vector3, Vector3> OnRayPoseUpdate;
        /// <summary>
        /// Use to render hand update invoke
        /// </summary>
        /// <typeparam  HandType >hand type</typeparam>
        public static Action<HandType, GestureBean> OnRenderHand;
        /// <summary>
        /// On handlost in camera space  callback
        /// </summary>
        /// <typeparam  HandType >hand type</typeparam>
        public static Action<HandType> OnHandLostInCameraSpace;

        /// <summary>
        /// On hand orientaion change callback update invoke
        /// </summary>
        public static Action<HandType, HandOrientation> OnHandOrientationUpdate;
        /// <summary>
        /// Gesture module action callback
        /// </summary>
        public static Action OnActiveGesModule;
        /// <summary>
        /// Gesture module release callback 
        /// </summary>
        public static Action OnReleaseGesModule;
        /// <summary>
        /// Gesture module init callback
        /// </summary>
        public static Action OnInitialzeGesModule;

        /// <summary>
        /// Hand or headhand type change callback
        /// </summary>
        public static Action<HandOrHeadHandType> OnHandOrHeadHandTypeChange;

        #endregion

        [SerializeField]
        private GesImplementation gesInput;

        /// <summary>
        /// Interator
        /// </summary>
        /// <value></value>
        public Transform Interactor { get; set; }

        /// <summary>
        /// Auto change headhand or handtype
        /// </summary>
        /// <value></value>
        public bool autoChangeHeadHandOrHandType = false;

        private bool initialize = false;


        private GesImplementation GesInput
        {
            get
            {
                if (gesInput == null)
                {
                    if (gameObject.GetComponent<GesImplementation>() != null)
                    {
                        gesInput = gameObject.GetComponent<GesImplementation>();
                    }
                    else
                    {
                        gesInput = gameObject.AddComponent<GesImplementation>();
                    }
                }
                return gesInput;
            }
        }


        /// <summary>
        /// Gesture Module Initialize
        /// </summary>
        /// <param name="parent">Generates the parent of the interactor</param>
        public void Initialize(Transform parent)
        {
            if (Utils.IsAndroidPlatfrom() && !FuncDeviceCheck.CheckHandTrackingFunc())
            {
                return;
            }
#if UNITY_EDITOR
            if (GetComponent<GestureMockInEditor>() == null)
                gameObject.AddComponent<GestureMockInEditor>();
#endif
            if (Interactor == null)
            {
                GameObject go = GameObject.Find("RKHand");
                if (go == null)
                {
                    go = GameObject.Instantiate(Resources.Load<GameObject>("Prefabs/Interactor/RKHand"));
                }
                go.name = "RKHand";
                Interactor = go.transform;
                Interactor.SetParent(transform);
            }
            Interactor.SetParent(transform);
            if (parent != null)
                this.transform.SetParent(parent);
            OnInitialzeGesModule?.Invoke();
            ActiveHandOrHeadHand(HandOrHeadHandType.NormalHand);
            GesInput.Initialze();
            initialize = true;
            RKLog.KeyInfo("====GesEventInit==== Init");
        }

        /// <summary>
        /// Activate hand interaction or head-hand interaction
        /// </summary>
        /// <param name="handOrHeadHandType"></param>
        public void ActiveHandOrHeadHand(HandOrHeadHandType handOrHeadHandType)
        {
            OnHandOrHeadHandTypeChange?.Invoke(handOrHeadHandType);
        }

        /// <summary>
        /// Release Gesture
        /// </summary>
        public void Release()
        {
            OnReleaseGesModule?.Invoke();
            Destroy(this.gameObject);
        }

        /// <summary>
        /// OnDestroy
        /// </summary>
        protected override void OnDestroy()
        {
            OnGesClick = null;
            OnTrackedFailed = null;
            OnHandPress = null;
            OnHandRelease = null;
            OnTrackedSuccess = null;
            OnProcessGesData = null;
            OnGesDataUpdate = null;
            OnLogGesData = null;
            OnRenderHand = null;
            initialize = false;
        }

        /// <summary>
        /// Active Gesture
        /// </summary>
        public void ActiveModule()
        {
            RKLog.KeyInfo("====GesEventInput==== : ActiveModule");
            OnActiveGesModule?.Invoke();
            RKVirtualController.Instance.Change(ControllerType.NORMAL);
            RKVirtualController.Instance.UseCustomGamePadEvent(false);
            EventSystem.current.pixelDragThreshold = 60;
        }

        /// <summary>
        /// Get Hand Pose 
        /// </summary>
        /// <param name="hand">handtype lefthand righthand</param>
        /// <returns></returns>
        public Vector3 GetHandDeltaPos(HandType hand)
        {
            if (!initialize) { return Vector3.zero; };
            return GesInput.GetHandDeltaPos(hand);
        }


        /// <summary>
        /// GetHandDown
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <param name="isPinch">true pinch / false  grip</param>
        /// <returns></returns>
        public bool GetHandDown(HandType type, bool isPinch)
        {
            if (!initialize) { return false; };
            return GesInput.GetHandDown(type, isPinch);
        }

        /// <summary>
        /// Get Hand Up
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <param name="isPinch">true pinch / false grip</param>
        /// <returns>When hand up return true or return false </returns>
        public bool GetHandUp(HandType type, bool isPinch)
        {
            if (!initialize) { return false; };
            return GesInput.GetHandUp(type, isPinch);
        }

        /// <summary>
        /// Get Hand Press
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <param name="isPinch">true pinch / false grip</param>
        /// <returns>When hand press return true or return false </returns>
        public bool GetHandPress(HandType type, bool isPinch)
        {
            if (!initialize) { return false; };
            return GesInput.GetHandPress(type, isPinch);
        }

        /// <summary>
        /// Get hand down
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <returns></returns>
        public bool GetHandDown(HandType type)
        {
            if (!initialize) { return false; };
            return GesInput.GetHandDown(type);
        }


        /// <summary>
        /// Get hand press
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <returns></returns>
        public bool GetHandPress(HandType type)
        {
            if (!initialize) { return false; };
            return GesInput.GetHandPress(type);
        }

        /// <summary>
        /// Set user height default 170 cm
        /// </summary>
        /// <param name="height"></param>
        public void SetUserHeight(float height)
        {
            if (!initialize) { return; };
            gesInput.SetUserHeight(height);
        }

        /// <summary>
        /// Get hand up
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <returns></returns>
        public bool GetHandUp(HandType type)
        {
            if (!initialize) { return false; };
            return GesInput.GetHandUp(type);
        }

        /// <summary>
        ///  Get current gesture info 
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <returns></returns>
        public Gesture GetGesture(HandType type)
        {
            if (!initialize) { return default(Gesture); };
            return GesInput.GetGesture(type);
        }

        /// <summary>
        /// Get current gesture type
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <returns></returns>
        public GestureType GetGestureType(HandType type)
        {
            if (!initialize) { return GestureType.None; };
            return GesInput.GetGestureType(type);
        }

        /// <summary>
        /// Get current hand center position
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <returns></returns>
        public Vector3 GetHandPos(HandType handType)
        {
            if (!initialize) { return Vector3.zero; };
            return GesInput.GetHandPos(handType);
        }

        /// <summary>
        /// Get current hand pose
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <returns>hand pose </returns>
        public Pose GetHandPose(HandType handType)
        {
            if (!initialize) { return Pose.identity; };
            return GesInput.GetHandPose(handType);
        }


        /// <summary>
        /// Get Skeleton Pose
        /// </summary>
        /// <param name="flag">Seleton index flag</param>
        /// <param name="type">left/right hand</param>
        /// <returns></returns>
        public Pose GetSkeletonPose(SkeletonIndexFlag flag, HandType type)
        {
            if (!initialize) { return Pose.identity; };
            return GesInput.GetSkeletonPose(flag, type);
        }

        /// <summary>
        /// Get hand interactor type
        /// </summary>
        /// <param name="type">left/right hand</param>
        /// <returns>InteractorType Near/Far </returns>
        public InteractorType GetInteractorType(HandType hand)
        {
            if (!initialize) { return InteractorType.None; };
            return GesInput.GetInteractorType(hand);
        }

        /// <summary>
        /// Set interacor type
        /// </summary>
        /// <param name="type">InteractorType Near/Far</param>
        /// <param name="hand">left/right hand</param>
        public void SetInteractorType(InteractorType type, HandType hand)
        {
            if (!initialize) { return; };
            GesInput.SetInteractorType(type, hand);
        }

        /// <summary>
        /// Get hand orientation
        /// </summary>
        /// <param name="hand">left/right hand</param>
        /// <returns></returns>
        public HandOrientation GetHandOrientation(HandType hand)
        {
            if (!initialize) { return HandOrientation.None; };
            return GesInput.GetHandOrientation(hand);
        }

        /// <summary>
        /// Unity Update
        /// </summary>
        private void Update()
        {
            if (!initialize)
                return;
#if UNITY_EDITOR
            if (Input.GetKeyDown(KeyCode.G) || Input.GetKeyDown(KeyCode.F))
            {
                this.ActiveModule();
            }
            if (Input.GetKeyDown(KeyCode.O))
            {
                ActiveHandOrHeadHand(HandOrHeadHandType.HeadHand);
            }
            if (Input.GetKeyDown(KeyCode.I))
            {
                ActiveHandOrHeadHand(HandOrHeadHandType.NormalHand);
            }
#else
            if (GetHandDown(HandType.LeftHand) &&
                          GetHandOrientation(HandType.LeftHand) == HandOrientation.Palm)
            {
                ProcessActiveModule(HandType.LeftHand);
                if (autoChangeHeadHandOrHandType)
                    ActiveHandOrHeadHand(HandOrHeadHandType.HeadHand);
            }
            if (GetHandDown(HandType.RightHand) &&
            GetHandOrientation(HandType.RightHand) == HandOrientation.Palm)
            {
                ProcessActiveModule(HandType.RightHand);
                if (autoChangeHeadHandOrHandType)
                    ActiveHandOrHeadHand(HandOrHeadHandType.NormalHand);
            }
#endif
        }

        /// <summary>
        /// Process module active logic
        /// </summary>
        /// <param name="hand">left/right hand</param>
        private void ProcessActiveModule(HandType hand)
        {
            Vector3 handPos = GesEventInput.Instance.GetHandPose(hand).position;
            Vector3 camereSpaceHandPos = MainCameraCache.mainCamera.transform.InverseTransformPoint(handPos);
            float hFov = Vector3.Angle(Vector3.forward, new Vector3(camereSpaceHandPos.x, 0, camereSpaceHandPos.z));
            float vFov = Vector3.Angle(Vector3.forward, new Vector3(0, camereSpaceHandPos.y, camereSpaceHandPos.z));
            // RKLog.Debug($"====GesEventInput==== hFov:{hFov}, vFov:{vFov}");
            if (hFov < 30 && vFov < 20)
            {
                this.ActiveModule();
            }
        }
    }
}