using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

[RequireComponent(typeof(RectTransform))]
public class AdapterKeyboardLayout : UIBehaviour
{
    /// <summary>
	/// 必须设置值，判断是由哪个InputField发起的
	/// </summary>
	public InputField m_InputField;
    /// <summary>
    /// 在适配虚拟键盘时，对齐的点， 默认为InputField
    /// </summary>
    public RectTransform anchorTransform;
    /// <summary>
    /// 在适配虚拟键盘时，做偏移的对象， ， 默认为Self
    /// </summary>
    public RectTransform offsetTransform;

    private Canvas m_Canvas;
    private RectTransform m_OffsetParentTransform;
    private Vector3 m_AnchorPos;
    private Vector3 m_OffsetInitPos;
    private Vector2 m_OffsetScreePos = Vector2.zero;
    private bool m_LastVisible = false;
    private bool IsNeedGetHight = true;
    private int m_KeyboardHeight_int = 0;
    public Canvas canvas
    {
        get
        {
            if (this.m_Canvas == null)
            {
                this.CacheCanvas();
            }
            return this.m_Canvas;
        }
    }

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

        if (!m_InputField)
        {
            enabled = false;
            Debug.LogError("InputField is Null", gameObject);
            return;
        }

        if (!anchorTransform) anchorTransform = (RectTransform)m_InputField.transform;
        if (!offsetTransform) offsetTransform = (RectTransform)transform;
        Transform parent = offsetTransform.parent;
        if (!parent)
        {
            enabled = false;
            Debug.LogError("offsetTransform's parent is Null", gameObject);
            return;
        }
        m_OffsetParentTransform = (RectTransform)parent;
    }

    protected override void OnTransformParentChanged()
    {
        base.OnTransformParentChanged();
        m_Canvas = null;
    }

    protected override void OnCanvasHierarchyChanged()
    {
        m_Canvas = null;
    }

    private void CacheCanvas()
    {
        List<Canvas> list = new List<Canvas>();
        base.gameObject.GetComponentsInParent(false, list);
        if (list.Count > 0)
        {
            int num = 0;
            while (num < list.Count)
            {
                if (!list[num].isActiveAndEnabled)
                {
                    num++;
                    continue;
                }
                m_Canvas = list[num];
                break;
            }
        }
        else
        {
            m_Canvas = null;
        }
    }

    private void Update()
    {
        Canvas curCanvas = canvas;
        if (curCanvas == null)
        {
            return;
        }

        if (!m_InputField.isFocused)
        {
            if (!Mathf.Approximately(m_OffsetScreePos.y, 0))
            {
                offsetTransform.localPosition = m_OffsetInitPos;
                m_OffsetScreePos.y = 0;
                DisposeMobileKeyboard();
            }
            if (!IsNeedGetHight)
            {
                SetIsNeedGetHight(true);
                Debug.Log("=========IsNeedGetHight===true======");
            }
            
            return;
        }

        bool visible = GetMobileKeyboardVisible();

        if (visible)
        {
            if (m_LastVisible != visible)
            {
                // 左下角
                Rect rect = anchorTransform.rect;
                m_AnchorPos = anchorTransform.TransformPoint(rect.min);
                m_AnchorPos = m_OffsetParentTransform.InverseTransformPoint(m_AnchorPos);
                m_OffsetInitPos = offsetTransform.localPosition;
            }

            float height = GetMobileKeyboardHeight();
          
            if (!Mathf.Approximately(height, m_OffsetScreePos.y))
            {
                m_OffsetScreePos.y = height;
                Vector2 pos;
                Camera camera = (curCanvas.renderMode == RenderMode.ScreenSpaceOverlay ? null : curCanvas.worldCamera);
                if (RectTransformUtility.ScreenPointToLocalPointInRectangle(m_OffsetParentTransform, m_OffsetScreePos, camera, out pos))
                {
                    if (m_AnchorPos.y < pos.y)
                    {
                        offsetTransform.localPosition = new Vector2(m_OffsetInitPos.x, m_OffsetInitPos.y + pos.y - m_AnchorPos.y);
                    }
                    else
                    {
                        offsetTransform.localPosition = m_OffsetInitPos;
                    }
                }
            }
        }
        else
        {
          
            if (!Mathf.Approximately(m_OffsetScreePos.y, 0))
            {
                offsetTransform.localPosition = m_OffsetInitPos;
                m_OffsetScreePos.y = 0;
                DisposeMobileKeyboard();
            }
        }

        m_LastVisible = visible;
    }

    private bool GetMobileKeyboardVisible()
    {
#if UNITY_EDITOR
        return true;
#elif UNITY_ANDROID || UNITY_IOS
		return TouchScreenKeyboard.visible;
#else
		return true;
#endif
    }

    private float GetMobileKeyboardHeight()
    {
        
#if UNITY_EDITOR
        return 0;
#elif UNITY_ANDROID
        return AndroidGetKeyboardHeight_E();//GetMobileKeyboardHeight_Android();
#elif UNITY_IOS
        return TouchScreenKeyboard.area.height;
#else
        return 0;
#endif
    }

    private void DisposeMobileKeyboard()
    {

#if UNITY_ANDROID
        if (m_InputDialogAJO != null)
        {
            m_InputDialogAJO.Dispose();
            m_InputDialogAJO = null;
        }
        if (m_ViewAJO != null)
        {
            Debug.Log("释放  m_View AJO");
            m_ViewAJO.Dispose();
            m_ViewAJO = null;
        }
        if (m_RectAJO != null)
        {
            Debug.Log("释放  m_Rect AJO");
            m_RectAJO.Dispose();
            m_RectAJO = null;
        }
        if (m_PointAJO != null)
        {
            m_PointAJO.Dispose();
            m_PointAJO = null;
        }
        if (m_DefaultDisplayAJO != null)
        {
            m_DefaultDisplayAJO.Dispose();
            m_DefaultDisplayAJO = null;
        }
#endif
    }


#if UNITY_ANDROID
    private static float m_KeyboardHeight = 0;
    
    private static int m_CalcFrameCount = 0;
    private static AndroidJavaObject m_InputDialogAJO = null;
    private static AndroidJavaObject m_ViewAJO = null;
    private static AndroidJavaObject m_RectAJO = null;
    private static AndroidJavaObject m_PointAJO = null;
    private static AndroidJavaObject m_DefaultDisplayAJO = null;
    private static float GetMobileKeyboardHeight_Android()
    {

        // 同一帧内不重复计算
        if (Time.frameCount == m_CalcFrameCount) { return m_KeyboardHeight; }
        m_CalcFrameCount = Time.frameCount;
        if (m_InputDialogAJO == null || m_ViewAJO == null || m_DefaultDisplayAJO == null)
        {
            using (AndroidJavaClass unityPlayerAJC = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
            {
                using (AndroidJavaObject currentActivityAJO = unityPlayerAJC.GetStatic<AndroidJavaObject>("currentActivity"))
                {
                    if (m_InputDialogAJO == null || m_ViewAJO == null)
                    {
                        using (AndroidJavaObject unityPlayerAJO = currentActivityAJO.Get<AndroidJavaObject>("mUnityPlayer"))
                        {
                            if (m_InputDialogAJO == null)
                            {
                                AndroidJavaClass dialogAJC = new AndroidJavaClass("android.app.Dialog");
                                AndroidJavaObject[] fieldsAJO = unityPlayerAJO.Call<AndroidJavaObject>("getClass").Call<AndroidJavaObject[]>("getDeclaredFields");
                                for (int i = 0, iMax = fieldsAJO.Length; i < iMax; i++)
                                {
                                    AndroidJavaObject dialogAJO = fieldsAJO[i].Call<AndroidJavaObject>("get", unityPlayerAJO);
                                    if (dialogAJO == null)
                                    {
                                        continue;
                                    }
                                    if (AndroidJNI.IsInstanceOf(dialogAJO.GetRawObject(), dialogAJC.GetRawClass()))
                                    {
                                        m_InputDialogAJO = dialogAJO.Call<AndroidJavaObject>("getWindow")
                                                            .Call<AndroidJavaObject>("getDecorView");
                                        break;
                                    }
                                }
                            }

                            if (m_ViewAJO == null)
                            {
                                m_ViewAJO = unityPlayerAJO.Call<AndroidJavaObject>("getView");
                            }
                        }
                    }
                    if (m_DefaultDisplayAJO == null)
                    {
                        m_DefaultDisplayAJO = currentActivityAJO.Call<AndroidJavaObject>("getWindowManager").Call<AndroidJavaObject>("getDefaultDisplay");
                    }
                }
            }
        }

        if (m_RectAJO == null)
        {
            m_RectAJO = new AndroidJavaObject("android.graphics.Rect");
        }

        if (m_PointAJO == null)
        {
            m_PointAJO = new AndroidJavaObject("android.graphics.Point");
        }

        float screenH = Screen.height;
        float realScreenH = 0;
        if (m_DefaultDisplayAJO != null)
        {
            m_DefaultDisplayAJO.Call("getRealSize", m_PointAJO);
            realScreenH = m_PointAJO.Get<int>("y");
        }
        else
        {
            realScreenH = screenH;
        }

        float height = 0f;
        if (m_InputDialogAJO != null)
        {
            bool result = m_InputDialogAJO.Call<bool>("getGlobalVisibleRect", m_RectAJO);
            if (result)
            {
                float inputDialogHeight = m_RectAJO.Call<int>("height");
                height += inputDialogHeight;
            }
        }

        if (m_ViewAJO != null)
        {
            m_ViewAJO.Call("getWindowVisibleDisplayFrame", m_RectAJO);
            float viewBottom = m_RectAJO.Get<int>("bottom");
            height += realScreenH - viewBottom;
        }
        m_KeyboardHeight = height * screenH / realScreenH;
        return m_KeyboardHeight;
    }



    public int AndroidGetKeyboardHeight()
    {
        using (AndroidJavaClass Unityclass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
        {
            AndroidJavaObject View = Unityclass.GetStatic<AndroidJavaObject>("currentActivity").
                Get<AndroidJavaObject>("mUnityPlayer").
                Call<AndroidJavaObject>("getView");

            using (AndroidJavaObject Rct = new AndroidJavaObject("android.graphics.Rect"))
            {
                View.Call("getWindowVisibleDisplayFrame", Rct);
                //Debug.Log(Screen.height - Rct.Call<int>("height")); 
                return Screen.height - Rct.Call<int>("height");
            }
        }
    }

    public int AndroidGetKeyboardHeight_E()
    {
        if (Time.frameCount == m_CalcFrameCount || !IsNeedGetHight) { return m_KeyboardHeight_int; }
        m_CalcFrameCount = Time.frameCount;
        GetJavaClass();
        m_ViewAJO.Call("getWindowVisibleDisplayFrame", m_RectAJO);
        //Debug.Log(Screen.height - Rct.Call<int>("height")); 
        int h = Screen.height - m_RectAJO.Call<int>("height");
        if (h == m_KeyboardHeight_int)
        {
            SetIsNeedGetHight(false);
        }
        m_KeyboardHeight_int = h;
        return m_KeyboardHeight_int;
    }


    private void GetJavaClass()
    {
        if (m_ViewAJO == null)
        {
            using (AndroidJavaClass Unityclass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
            {
                m_ViewAJO = Unityclass.GetStatic<AndroidJavaObject>("currentActivity").
                    Get<AndroidJavaObject>("mUnityPlayer").
                    Call<AndroidJavaObject>("getView");
            }

            Debug.Log("获取  m_View AJO");
        }

        if (m_RectAJO == null)
        {
            Debug.Log("获取  m_Rect AJO");
            m_RectAJO = new AndroidJavaObject("android.graphics.Rect");
        }

    }



#endif

    private void SetIsNeedGetHight(bool value)
    {
        IsNeedGetHight = value;
        if (IsNeedGetHight)
        {
            m_KeyboardHeight_int = 0;
        }

    }
}