using EZXR.Glass.Inputs;
using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Serialization;
using UnityEngine.UI;

namespace UnityEngine.EventSystems
{
    [AddComponentMenu("Event/Hand Input Module")]
    /// <summary>
    /// A BaseInputModule designed for mouse / keyboard / controller input.
    /// </summary>
    /// <remarks>
    /// Input module for working with, mouse, keyboard, or controller.
    /// </remarks>
    public class HandInputModule : PointerInputModule
    {
        Button curPointerHover;
        Button lastPointerHover;
        public static Action<Button> OnPointerHover;
        public static Action<Button> OnPointerExit;

        public static Touch[] touches = new Touch[2];
        //public static Dictionary<int, HandInfoBase> handInfoPairs = new Dictionary<int, HandInfoBase>();

        private static Vector2[] inputMousePosition = new Vector2[1];
        private Vector2 m_MousePosition;

        private GameObject m_CurrentFocusedGameObject;

        private PointerEventData m_InputPointerEvent;
        public static PointerEventData eventData_Left;
        public static PointerEventData eventData_Right;

        protected HandInputModule()
        {
        }

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

            touches[0].fingerId = (int)HandType.Left;
            touches[1].fingerId = (int)HandType.Right;

            /*
            if (controllerType == ControllerType.Gestures)
            {
                handInfoPairs.Add(finger_left, InputSystem.leftHand);
                handInfoPairs.Add(finger_right, InputSystem.rightHand);
                Debug.Log("HandInputModule, Init handInfoPairs with HandInfo (use Gestures)");
            }
            else
            {
                handInfoPairs.Add(finger_left, HandleControllerManager.leftHand);
                handInfoPairs.Add(finger_right, HandleControllerManager.rightHand);
                Debug.Log("HandInputModule, Init handInfoPairs with HandleControllerInfo (use Handles)");
            }
            */
        }

        private void Update()
        {
            GetPointerData(0, out eventData_Left, false);
            GetPointerData(1, out eventData_Right, false);

            Button newPointerHover = null;
            if (eventData_Left != null && eventData_Left.pointerEnter != null)
            {
                newPointerHover = eventData_Left.pointerEnter.GetComponent<Button>();
            }

            if (eventData_Right != null && eventData_Right.pointerEnter != null)
            {
                newPointerHover = eventData_Right.pointerEnter.GetComponent<Button>();
            }

            if (newPointerHover != null && newPointerHover != curPointerHover)
            {
                if (OnPointerHover != null)
                {
                    OnPointerHover(newPointerHover);
                }
                if (OnPointerExit != null)
                {
                    OnPointerExit(curPointerHover);
                }

                lastPointerHover = curPointerHover;
                curPointerHover = newPointerHover;
            }
        }

        [Obsolete("Mode is no longer needed on input module as it handles both mouse and keyboard simultaneously.", false)]
        public enum InputMode
        {
            Mouse,
            Buttons
        }

        [Obsolete("Mode is no longer needed on input module as it handles both mouse and keyboard simultaneously.", false)]
        public InputMode inputMode
        {
            get { return InputMode.Mouse; }
        }

        [SerializeField]
        [FormerlySerializedAs("m_AllowActivationOnMobileDevice")]
        private bool m_ForceModuleActive;

        [Obsolete("allowActivationOnMobileDevice has been deprecated. Use forceModuleActive instead (UnityUpgradable) -> forceModuleActive")]
        public bool allowActivationOnMobileDevice
        {
            get { return m_ForceModuleActive; }
            set { m_ForceModuleActive = value; }
        }

        /// <summary>
        /// Force this module to be active.
        /// </summary>
        /// <remarks>
        /// If there is no module active with higher priority (ordered in the inspector) this module will be forced active even if valid enabling conditions are not met.
        /// </remarks>
        public bool forceModuleActive
        {
            get { return m_ForceModuleActive; }
            set { m_ForceModuleActive = value; }
        }

        private bool m_shouldActivate;
        public bool shouldActivate
        {
            get { return m_shouldActivate; }
            set { m_shouldActivate = value; }
        }

        private bool ShouldIgnoreEventsOnNoFocus()
        {
            switch (SystemInfo.operatingSystemFamily)
            {
                case OperatingSystemFamily.Windows:
                case OperatingSystemFamily.Linux:
                case OperatingSystemFamily.MacOSX:
#if UNITY_EDITOR
                    if (UnityEditor.EditorApplication.isRemoteConnected)
                        return false;
#endif
                    return true;
                default:
                    return false;
            }
        }

        public override void UpdateModule()
        {
            if (!eventSystem.isFocused && ShouldIgnoreEventsOnNoFocus())
            {
                if (m_InputPointerEvent != null && m_InputPointerEvent.pointerDrag != null && m_InputPointerEvent.dragging)
                {
                    ReleaseMouse(m_InputPointerEvent, m_InputPointerEvent.pointerCurrentRaycast.gameObject);
                }

                m_InputPointerEvent = null;

                return;
            }

            m_MousePosition = inputMousePosition[0];
        }

        private void ReleaseMouse(PointerEventData pointerEvent, GameObject currentOverGo)
        {
            ExecuteEvents.Execute(pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerUpHandler);

            var pointerUpHandler = ExecuteEvents.GetEventHandler<IPointerClickHandler>(currentOverGo);

            // PointerClick and Drop events
            if (pointerEvent.pointerPress == pointerUpHandler && pointerEvent.eligibleForClick)
            {
                ExecuteEvents.Execute(pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerClickHandler);
            }
            else if (pointerEvent.pointerDrag != null && pointerEvent.dragging)
            {
                ExecuteEvents.ExecuteHierarchy(currentOverGo, pointerEvent, ExecuteEvents.dropHandler);
            }

            pointerEvent.eligibleForClick = false;
            pointerEvent.pointerPress = null;
            pointerEvent.rawPointerPress = null;

            if (pointerEvent.pointerDrag != null && pointerEvent.dragging)
                ExecuteEvents.Execute(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.endDragHandler);

            pointerEvent.dragging = false;
            pointerEvent.pointerDrag = null;

            // redo pointer enter / exit to refresh state
            // so that if we moused over something that ignored it before
            // due to having pressed on something else
            // it now gets it.
            if (currentOverGo != pointerEvent.pointerEnter)
            {
                HandlePointerExitAndEnter(pointerEvent, null);
                HandlePointerExitAndEnter(pointerEvent, currentOverGo);
            }

            m_InputPointerEvent = pointerEvent;
        }

        public override bool IsModuleSupported()
        {
            return true /*|| input.mousePresent || input.touchSupported*/;
        }

        public override bool ShouldActivateModule()
        {
            if (!base.ShouldActivateModule())
                return false;

            var shouldActivate = m_ForceModuleActive;
            //shouldActivate |= input.GetButtonDown(m_SubmitButton);
            //shouldActivate |= input.GetButtonDown(m_CancelButton);
            //shouldActivate |= !Mathf.Approximately(input.GetAxisRaw(m_HorizontalAxis), 0.0f);
            //shouldActivate |= !Mathf.Approximately(input.GetAxisRaw(m_VerticalAxis), 0.0f);
            //shouldActivate |= (m_MousePosition - m_LastMousePosition).sqrMagnitude > 0.0f;
            //shouldActivate |= input.GetMouseButtonDown(0);

            //if (input.touchCount > 0)
            //    shouldActivate = true;

            //return shouldActivate;

            return m_shouldActivate;
        }

        /// <summary>
        /// See BaseInputModule.
        /// </summary>
        public override void ActivateModule()
        {
            if (!eventSystem.isFocused && ShouldIgnoreEventsOnNoFocus())
                return;

            base.ActivateModule();
            m_MousePosition = inputMousePosition[0];

            var toSelect = eventSystem.currentSelectedGameObject;
            if (toSelect == null)
                toSelect = eventSystem.firstSelectedGameObject;

            eventSystem.SetSelectedGameObject(toSelect, GetBaseEventData());
        }

        /// <summary>
        /// See BaseInputModule.
        /// </summary>
        public override void DeactivateModule()
        {
            base.DeactivateModule();
            ClearSelection();
        }

        public override void Process()
        {
            if (!eventSystem.isFocused && ShouldIgnoreEventsOnNoFocus())
                return;

            //>>>>>>>>>>>!!!!!!!!!         //if (!ProcessTouchEvents() && input.mousePresent)
            //ProcessMouseEvent(0);

            ProcessTouchEvents();
        }

        private bool ProcessTouchEvents()
        {
            for (int i = 0; i < touches.Length; ++i)
            {
                Touch touch = touches[i];

                if (touch.type == TouchType.Indirect)
                    continue;

                bool released;
                bool pressed;
                var pointer = GetHandPointerTouchEventData(touch, out pressed, out released);

                ProcessTouchPress(pointer, pressed, released, touch.fingerId == 0 ? EZXR.Glass.Inputs.InputSystem.leftHand : EZXR.Glass.Inputs.InputSystem.rightHand);

                if (!released)
                {
                    ProcessMove(pointer);
                    ProcessDrag(pointer);
                }
                else
                    RemovePointerData(pointer);
            }
            return touches.Length > 0;
        }

        PointerEventData GetHandPointerTouchEventData(Touch input, out bool pressed, out bool released)
        {
            PointerEventData pointerData;
            var created = GetPointerData(input.fingerId, out pointerData, true);

            pointerData.Reset();

            var handInfo = input.fingerId == (int)HandType.Left ? EZXR.Glass.Inputs.InputSystem.leftHand : EZXR.Glass.Inputs.InputSystem.rightHand;
            if (handInfo != null)
            {
                pressed = handInfo.startPinch;
                released = handInfo.endPinch;
            }
            else
            {
                pressed = false;
                released = false;
            }
            //pressed = (input.fingerId == (int)HandType.Left ? ControllerManager.leftHand : ControllerManager.rightHand).startPinch;
            //released = (input.fingerId == (int)HandType.Left ? ControllerManager.leftHand : ControllerManager.rightHand).endPinch;

            if (created)
                pointerData.position = input.position;

            if (pressed)
                pointerData.delta = Vector2.zero;
            else
                pointerData.delta = input.position - pointerData.position;

            pointerData.position = input.position;

            pointerData.button = PointerEventData.InputButton.Left;

            if (input.phase == TouchPhase.Canceled)
            {
                pointerData.pointerCurrentRaycast = new RaycastResult();
            }
            else
            {
                eventSystem.RaycastAll(pointerData, m_RaycastResultCache);

                var raycast = FindFirstRaycast(m_RaycastResultCache);
                pointerData.pointerCurrentRaycast = raycast;
                //if (raycast.gameObject != null)
                //    Debug.Log($"HandControllerSession, Raycast = {raycast.gameObject.name}, screenPosition = ({pointerData.position.x}, {pointerData.position.y})");
                m_RaycastResultCache.Clear();
            }
            return pointerData;
        }

        /// <summary>
        /// This method is called by Unity whenever a touch event is processed. Override this method with a custom implementation to process touch events yourself.
        /// </summary>
        /// <param name="pointerEvent">Event data relating to the touch event, such as position and ID to be passed to the touch event destination object.</param>
        /// <param name="pressed">This is true for the first frame of a touch event, and false thereafter. This can therefore be used to determine the instant a touch event occurred.</param>
        /// <param name="released">This is true only for the last frame of a touch event.</param>
        /// <remarks>
        /// This method can be overridden in derived classes to change how touch press events are handled.
        /// </remarks>
        protected void ProcessTouchPress(PointerEventData pointerEvent, bool pressed, bool released, InputInfoBase inputInfo)
        {
            var currentOverGo = pointerEvent.pointerCurrentRaycast.gameObject;

            // PointerDown notification
            if (pressed)
            {
                pointerEvent.eligibleForClick = true;
                pointerEvent.delta = Vector2.zero;
                pointerEvent.dragging = false;
                pointerEvent.useDragThreshold = true;
                pointerEvent.pressPosition = pointerEvent.position;
                pointerEvent.pointerPressRaycast = pointerEvent.pointerCurrentRaycast;

                DeselectIfSelectionChanged(currentOverGo, pointerEvent);

                if (pointerEvent.pointerEnter != currentOverGo)
                {
                    // send a pointer enter to the touched element if it isn't the one to select...
                    HandlePointerExitAndEnter(pointerEvent, currentOverGo);
                    pointerEvent.pointerEnter = currentOverGo;
                }

                // search for the control that will receive the press
                // if we can't find a press handler set the press
                // handler to be what would receive a click.
                var newPressed = ExecuteEvents.ExecuteHierarchy(currentOverGo, pointerEvent, ExecuteEvents.pointerDownHandler);

                // didnt find a press handler... search for a click handler
                if (newPressed == null)
                    newPressed = ExecuteEvents.GetEventHandler<IPointerClickHandler>(currentOverGo);

                // Debug.Log("Pressed: " + newPressed);

                float time = Time.unscaledTime;

                if (newPressed == pointerEvent.lastPress)
                {
                    var diffTime = time - pointerEvent.clickTime;
                    if (diffTime < 0.3f)
                        ++pointerEvent.clickCount;
                    else
                        pointerEvent.clickCount = 1;

                    pointerEvent.clickTime = time;
                }
                else
                {
                    pointerEvent.clickCount = 1;
                }

                pointerEvent.pointerPress = newPressed;
                pointerEvent.rawPointerPress = currentOverGo;

                pointerEvent.clickTime = time;

                // Save the drag handler as well
                pointerEvent.pointerDrag = ExecuteEvents.GetEventHandler<IDragHandler>(currentOverGo);

                if (pointerEvent.pointerDrag != null)
                    ExecuteEvents.Execute(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.initializePotentialDrag);

                m_InputPointerEvent = pointerEvent;
            }

            // PointerUp notification
            if (released)
            {
#if SYSTEMUI
                #region 在松开手指的时候向当前指向的物体发送press事件
                if (inputInfo.isPalmFacingHead())
                {
                    // search for the control that will receive the press
                    // if we can't find a press handler set the press
                    // handler to be what would receive a click.
                    var newPressed = ExecuteEvents.ExecuteHierarchy(currentOverGo, pointerEvent, ExecuteEvents.pointerDownHandler);

                    // didnt find a press handler... search for a click handler
                    if (newPressed == null)
                        newPressed = ExecuteEvents.GetEventHandler<IPointerClickHandler>(currentOverGo);

                    pointerEvent.pointerPress = newPressed;
                    pointerEvent.rawPointerPress = currentOverGo;
                }
                #endregion
#endif

                // Debug.Log("Executing pressup on: " + pointer.pointerPress);
                ExecuteEvents.Execute(pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerUpHandler);

                // Debug.Log("KeyCode: " + pointer.eventData.keyCode);

                // see if we mouse up on the same element that we clicked on...
                var pointerUpHandler = ExecuteEvents.GetEventHandler<IPointerClickHandler>(currentOverGo);

#if SYSTEMUI
                pointerEvent.pointerPress = pointerUpHandler;
#endif
                // PointerClick and Drop events
                if (/*pointerEvent.pointerPress == pointerUpHandler &&*/ pointerEvent.eligibleForClick)
                {
                    ExecuteEvents.Execute(pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerClickHandler);
                }

                if (pointerEvent.pointerDrag != null && pointerEvent.dragging)
                {
                    ExecuteEvents.ExecuteHierarchy(currentOverGo, pointerEvent, ExecuteEvents.dropHandler);
                }

                pointerEvent.eligibleForClick = false;
                pointerEvent.pointerPress = null;
                pointerEvent.rawPointerPress = null;

                if (pointerEvent.pointerDrag != null && pointerEvent.dragging)
                    ExecuteEvents.Execute(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.endDragHandler);

                pointerEvent.dragging = false;
                pointerEvent.pointerDrag = null;

                // send exit events as we need to simulate this on touch up on touch device
                ExecuteEvents.ExecuteHierarchy(pointerEvent.pointerEnter, pointerEvent, ExecuteEvents.pointerExitHandler);
                pointerEvent.pointerEnter = null;

                m_InputPointerEvent = pointerEvent;
            }
        }

        /// <summary>
        /// Process all mouse events.
        /// </summary>
        protected void ProcessMouseEvent(int id)
        {
            var mouseData = GetHandMousePointerEventData(id);
            var leftButtonData = mouseData.GetButtonState(PointerEventData.InputButton.Left).eventData;

            m_CurrentFocusedGameObject = leftButtonData.buttonData.pointerCurrentRaycast.gameObject;

            // Process the first mouse button fully
            ProcessMousePress(leftButtonData);
            ProcessMove(leftButtonData.buttonData);
            ProcessDrag(leftButtonData.buttonData);

            //// Now process right / middle clicks
            //ProcessMousePress(mouseData.GetButtonState(PointerEventData.InputButton.Right).eventData);
            //ProcessDrag(mouseData.GetButtonState(PointerEventData.InputButton.Right).eventData.buttonData);
            //ProcessMousePress(mouseData.GetButtonState(PointerEventData.InputButton.Middle).eventData);
            //ProcessDrag(mouseData.GetButtonState(PointerEventData.InputButton.Middle).eventData.buttonData);
        }

        protected override void ProcessMove(PointerEventData pointerEvent)
        {
            var targetGO = pointerEvent.pointerCurrentRaycast.gameObject;
            HandlePointerExitAndEnter(pointerEvent, targetGO);
        }

        /// <summary>
        /// Return the current MouseState.
        /// </summary>
        protected virtual MouseState GetHandMousePointerEventData(int id)
        {
            // Populate the left button...
            PointerEventData leftData;
            var created = GetPointerData(kMouseLeftId, out leftData, true);

            leftData.Reset();

            if (created)
                leftData.position = inputMousePosition[0];

            Vector2 pos = inputMousePosition[0];
            leftData.delta = pos - leftData.position;
            //Debug.Log(pos.ToString("#.####") + "�� " + leftData.position.ToString("#.####") + ", " + leftData.delta.y);
            leftData.position = pos;

            leftData.scrollDelta = Vector2.zero;// input.mouseScrollDelta;
            leftData.button = PointerEventData.InputButton.Left;
            eventSystem.RaycastAll(leftData, m_RaycastResultCache);
            var raycast = FindFirstRaycast(m_RaycastResultCache);
            leftData.pointerCurrentRaycast = raycast;
            m_RaycastResultCache.Clear();

            //// copy the apropriate data into right and middle slots
            //PointerEventData rightData;
            //GetPointerData(kMouseRightId, out rightData, true);
            //CopyFromTo(leftData, rightData);
            //rightData.button = PointerEventData.InputButton.Right;

            //PointerEventData middleData;
            //GetPointerData(kMouseMiddleId, out middleData, true);
            //CopyFromTo(leftData, middleData);
            //middleData.button = PointerEventData.InputButton.Middle;

            MouseState m_MouseState = new MouseState();
            m_MouseState.SetButtonState(PointerEventData.InputButton.Left, StateForHandMouseButton(0), leftData);
            //m_MouseState.SetButtonState(PointerEventData.InputButton.Right, StateForMouseButton(1), rightData);
            //m_MouseState.SetButtonState(PointerEventData.InputButton.Middle, StateForMouseButton(2), middleData);

            return m_MouseState;
        }

        /// <summary>
        /// Given a mouse button return the current state for the frame.
        /// </summary>
        /// <param name="buttonId">Mouse button ID</param>
        protected PointerEventData.FramePressState StateForHandMouseButton(int buttonId)
        {
            //#if UNITY_EDITOR
            //            var pressed = input.GetMouseButtonDown(buttonId);
            //            var released = input.GetMouseButtonUp(buttonId);
            //#else
            bool pressed = /*EZXR.Glass.Inputs.InputSystem.leftHand.startPinch || */EZXR.Glass.Inputs.InputSystem.leftHand.startPinch;
            bool released = /*EZXR.Glass.Inputs.InputSystem.leftHand.endPinch || */EZXR.Glass.Inputs.InputSystem.leftHand.endPinch;
            //#endif

            if (pressed && released)
                return PointerEventData.FramePressState.PressedAndReleased;
            if (pressed)
                return PointerEventData.FramePressState.Pressed;
            if (released)
                return PointerEventData.FramePressState.Released;
            return PointerEventData.FramePressState.NotChanged;
        }

        /// <summary>
        /// Calculate and process any mouse button state changes.
        /// </summary>
        protected void ProcessMousePress(MouseButtonEventData data)
        {
            var pointerEvent = data.buttonData;
            var currentOverGo = pointerEvent.pointerCurrentRaycast.gameObject;

            // PointerDown notification
            if (data.PressedThisFrame())
            {
                //Debug.Log("data.PressedThisFrame");
                pointerEvent.eligibleForClick = true;
                pointerEvent.delta = Vector2.zero;
                pointerEvent.dragging = false;
                pointerEvent.useDragThreshold = true;
                pointerEvent.pressPosition = pointerEvent.position;
                pointerEvent.pointerPressRaycast = pointerEvent.pointerCurrentRaycast;

                DeselectIfSelectionChanged(currentOverGo, pointerEvent);

                // search for the control that will receive the press
                // if we can't find a press handler set the press
                // handler to be what would receive a click.
                var newPressed = ExecuteEvents.ExecuteHierarchy(currentOverGo, pointerEvent, ExecuteEvents.pointerDownHandler);

                // didnt find a press handler... search for a click handler
                if (newPressed == null)
                    newPressed = ExecuteEvents.GetEventHandler<IPointerClickHandler>(currentOverGo);

                // Debug.Log("Pressed: " + newPressed);

                float time = Time.unscaledTime;

                if (newPressed == pointerEvent.lastPress)
                {
                    var diffTime = time - pointerEvent.clickTime;
                    if (diffTime < 0.3f)
                        ++pointerEvent.clickCount;
                    else
                        pointerEvent.clickCount = 1;

                    pointerEvent.clickTime = time;
                }
                else
                {
                    pointerEvent.clickCount = 1;
                }

                pointerEvent.pointerPress = newPressed;
                pointerEvent.rawPointerPress = currentOverGo;

                pointerEvent.clickTime = time;

                // Save the drag handler as well
                pointerEvent.pointerDrag = ExecuteEvents.GetEventHandler<IDragHandler>(currentOverGo);

                if (pointerEvent.pointerDrag != null)
                    ExecuteEvents.Execute(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.initializePotentialDrag);

                m_InputPointerEvent = pointerEvent;
            }

            // PointerUp notification
            if (data.ReleasedThisFrame())
            {
                ReleaseMouse(pointerEvent, currentOverGo);
            }
        }

        protected GameObject GetCurrentFocusedGameObject()
        {
            return m_CurrentFocusedGameObject;
        }
    }
}