using System.Collections;
using UnityEngine;
using UnityEngine.UI;

public class InputFieldLayoutX : MonoBehaviour
{
    public InputField inputField;//输入框组件
    public RectTransform moveRect;//输入框组件ui框，同时也用于移动
    public MaskableGraphic noTransparentOnFocused; //聚焦时，图像不透明
    private static Material _NoTransparentMaterial;
    public static Material NoTransparentMaterial {
        get {
            if (!_NoTransparentMaterial) _NoTransparentMaterial = new Material(Shader.Find("JC/UI/InputFieldLayoutX_NoTransparent"));
            return _NoTransparentMaterial;
        }
    }

    bool isFocused = false;
    Vector2 moveRectOriginAnchoredPos;
    Vector2 moveRectOriginPos;
    float keyboardHeight_last = 0;

    void Start()
    {
        if (inputField == null) {
            inputField = GetComponentInChildren<InputField>();
        }
        if (moveRect == null) {
            moveRect = GetComponent<RectTransform>();
        }
        // Debug.Log($"Screen.height:{Screen.height}");
        // Debug.Log($"systemHeight:{Display.main.systemHeight}");
        // Debug.Log($"renderingHeight:{Display.main.renderingHeight}");
        // Debug.Log($"TouchScreenKeyboard.isSupported:{TouchScreenKeyboard.isSupported}");
        // Debug.Log($"moveRect.anchoredPosition:{moveRect.anchoredPosition}"); //本地坐标
        // Debug.Log($"moveRect.position:{moveRect.position}"); //屏幕坐标-跟canvas-scale无关
    }
    private void Update()
    {
        if (isFocused != inputField.isFocused)
        {
            isFocused = inputField.isFocused;
            if (isFocused) onGetFocused();
            else onLostFocused();
        }
    }

    void onGetFocused()
    {
        moveRectOriginAnchoredPos = moveRect.anchoredPosition;
        moveRectOriginPos = moveRect.position;
        StartCoroutine(DelayGetKeyboardHeight());
        if (noTransparentOnFocused) noTransparentOnFocused.material = NoTransparentMaterial;
    }

    void onLostFocused()
    {
        keyboardHeight_last = 0;
        moveRect.anchoredPosition = moveRectOriginAnchoredPos;
        if (noTransparentOnFocused) noTransparentOnFocused.material = null;
    }

    IEnumerator DelayGetKeyboardHeight()
    {
        yield return null;
        while (inputField.isFocused)
        {
            float kb_height = GetKeyboardHeight();
            if(kb_height > 0 && kb_height != keyboardHeight_last)
            {
                keyboardHeight_last = kb_height;
                SetInputUIHeight(kb_height);
            }
            yield return new WaitForSecondsRealtime(0.333f);
        }
    }

    void SetInputUIHeight(float keyboardHeight)
    {
        float canvasHeight = gameObject.GetComponentInParent<CanvasScaler>().GetComponent<RectTransform>().sizeDelta.y;
        keyboardHeight = canvasHeight * keyboardHeight / Screen.height;
        Vector3 posInCanvas = moveRectOriginPos * canvasHeight / Screen.height;
        float moveRectHeight = posInCanvas.y - moveRect.rect.height * moveRect.pivot.y;
        if (keyboardHeight > moveRectHeight)
        {
            moveRect.anchoredPosition = moveRectOriginAnchoredPos + Vector2.up * (keyboardHeight - moveRectHeight);
        }
    }
       
    float GetKeyboardHeight()
    {
#if !UNITY_EDITOR && UNITY_ANDROID
        int decorHeight = 0; //输入框高度
        int freeHeight = 0; //除去键盘后的高度 
        using (var unityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
        {   
            using (var currentActivity = unityClass.GetStatic<AndroidJavaObject>("currentActivity")) 
            {
                using (var unityPlayer = currentActivity.Get<AndroidJavaObject>("mUnityPlayer"))
                {
                    
                    using (var view = unityPlayer.Call<AndroidJavaObject>("getView"))
                    {
                        using (var rect = new AndroidJavaObject("android.graphics.Rect"))
                        {
                            view.Call("getWindowVisibleDisplayFrame", rect);
                            freeHeight = rect.Call<int>("height");
                        }
                    }
                    using (var dialog = unityPlayer.Get<AndroidJavaObject>("mSoftInputDialog"))
                    {
                        using (var window = dialog.Call<AndroidJavaObject>("getWindow"))
                        {
                            using (var decorView = window.Call<AndroidJavaObject>("getDecorView"))
                            {
                                decorHeight = decorView.Call<int>("getHeight");
                            }
                        }
                    }
                }
            }
        }
        return Screen.height - freeHeight + decorHeight;
#elif !UNITY_EDITOR && UNITY_IOS
        return TouchScreenKeyboard.area.height;
#elif UNITY_EDITOR
        return Screen.height * 0.7625f; 
#else
        return 0;
#endif
    }
}