using UnityEngine;
using UnityEngine.UI;

public class ScreenAdjustMode
{
    public static int M_16_9 = 0;
    public static int M_18_9 = 1;
    public static int M_16_12 = 2;
}

public class ScreenAutoAdjust : MonoBehaviour
{
    public static ScreenAutoAdjust Instance;

    public int mode;
    public Vector2 screenPointMax;

    //public Camera m_uiCamera;
    //public Canvas m_Canvas;
    public CanvasScaler m_CanvasScaler;

    public UIMgr m_uiMgr;

    public static readonly int DevWidth = 2568;     // max 2972
    public static readonly int DevHeight = 1284;    // max 1712

    private void Awake()
    {
        Instance = this;

        //m_Canvas = transform.GetComponent<Canvas>();
        m_CanvasScaler = transform.GetComponent<CanvasScaler>();
        if (transform.parent)
        {
            m_uiMgr = transform.parent.GetComponent<UIMgr>();
        }

    }

    private void Start()
    {
        ScreenAutoAdapt();
    }

    // 屏幕自适应
    public void ScreenAutoAdapt()
    {
        float screenRate = Screen.width / (float)Screen.height;
        if (screenRate < 1.77f)
        {
            ScreenAutoAdapt1();
        }
        else
        {
            ScreenAutoAdapt2();
        }
    }


    // 多出来的填充黑边的适应方式 4:3屏幕使用, 只要小于16:9 基本都是用这个 *:填充黑边的方式需要有摄像机
    public void ScreenAutoAdapt1()
    {
        int devWidth = DevWidth;
        int devHeight = DevHeight;
        mode = ScreenAdjustMode.M_16_12;

        //屏幕比 > 2:1的用 2:1, 小于2:1的用16: 9
        float screenRate = (float)Screen.width / (float)Screen.height;

        devWidth = Mathf.FloorToInt(DevHeight * 16 / 9f);
        RectTransform rect = m_uiMgr.m_NodeUI.GetComponent<RectTransform>();
        rect.sizeDelta = new Vector2(devWidth, devHeight);
        RectTransform rect2 = m_uiMgr.m_NodeScreen.GetComponent<RectTransform>();
        rect2.sizeDelta = new Vector2(devWidth, devHeight);
        RectTransform rect3 = m_uiMgr.m_NodeLoading.GetComponent<RectTransform>();
        rect3.sizeDelta = new Vector2(devWidth, devHeight);

        m_uiMgr.m_RtfShelter.gameObject.SetActive(true);
        m_uiMgr.m_RtfShelter.sizeDelta = new Vector2(0, devHeight);

        //项目要使用的屏幕比
        float devRate = (float)devWidth / (float)devHeight;
        int useHeight = Screen.height;
        int useWidth = Mathf.FloorToInt(devRate * useHeight);
        if (screenRate < devRate)
        {
            useWidth = Screen.width;
            useHeight = Mathf.FloorToInt((float)useWidth / devRate);
        }

        Debug.Log("Screen.width:" + Screen.width.ToString() + ", Screen.height:" + Screen.height.ToString());
        

        //m_Canvas.renderMode = RenderMode.ScreenSpaceCamera;
        UIMgr.Instance.IsScreenClip = true;

        m_CanvasScaler.referenceResolution = new Vector2Int(devWidth, devHeight);
        if (screenRate >= devRate)
            m_CanvasScaler.matchWidthOrHeight = 1;
        else
            m_CanvasScaler.matchWidthOrHeight = 0;

        float cameraRectWidthRate = 0f;
        float cameraRectHeightRate = 0f;

        Debug.Log("screenRate:" + screenRate.ToString() + ", devRate:" + devRate.ToString());
        if (useWidth < devWidth)
        {// 缩小

            if (screenRate >= devRate)
            {// 宽度缩小 高度不变
                m_CanvasScaler.matchWidthOrHeight = 1;
                cameraRectWidthRate = (float)devWidth / (float)Screen.width;
                Debug.Log("cameraRectHeightRate1 cameraRectWidthRate:" + cameraRectWidthRate.ToString());
            }
            else
            {// 高度缩小 宽不变
                m_CanvasScaler.matchWidthOrHeight = 0;
                cameraRectHeightRate = (float)useHeight / (float)Screen.height;
                Debug.Log("cameraRectHeightRate2 cameraRectHeightRate:" + cameraRectHeightRate.ToString());
            }
        }
        else
        {// 放大
            if (screenRate >= devRate)
            {// 宽度缩小 高度不变
                m_CanvasScaler.matchWidthOrHeight = 1;
                cameraRectWidthRate = (float)useWidth / (float)Screen.width;
                Debug.Log("cameraRectHeightRate3 cameraRectWidthRate:" + cameraRectWidthRate.ToString());
            }
            else
            {// 高度缩小 宽不变
                m_CanvasScaler.matchWidthOrHeight = 0;
                cameraRectHeightRate = (float)useHeight / (float)Screen.height;
                Debug.Log("cameraRectHeightRate4 cameraRectHeightRate:" + cameraRectHeightRate.ToString());
            }
        }

        Debug.Log("Screen.width:" + Screen.width + ", Screen.height:" + Screen.height);
        Debug.Log("useWidth:" + useWidth.ToString() + ", useHeight:" + useHeight.ToString());
    }


    // 改变NodeUI的大小适应方式 16:9 2:1的都用这个
    public void ScreenAutoAdapt2()
    {
        m_uiMgr.m_RtfShelter.gameObject.SetActive(false);

        int devWidth = DevWidth;
        int devHeight = DevHeight;
        mode = ScreenAdjustMode.M_18_9;

        // 屏幕比 > 2:1的用 2:1, 小于2:1的用16:9
        float screenRate = Screen.width / (float)Screen.height;
        if (screenRate < 1.98f)
        {
            devWidth = DevHeight * 16 / 9;// 2283;//1920
            mode = ScreenAdjustMode.M_16_9;
        }

        float devRate = devWidth / (float)devHeight;


        //// 项目要使用的屏幕比
        int useHeight = Screen.height;
        int useWidth = Mathf.FloorToInt(devRate * useHeight);
        if (screenRate < devRate)
        {
            useWidth = Screen.width;
            useHeight = Mathf.FloorToInt(useWidth / devRate);
        }

        screenPointMax.x = Screen.width;
        screenPointMax.y = Screen.height;

        m_CanvasScaler.referenceResolution = new Vector2Int(devWidth, devHeight); // Vector2
        if (screenRate >= devRate)
        {
            m_CanvasScaler.matchWidthOrHeight = 1;
        }
        else
        {
            m_CanvasScaler.matchWidthOrHeight = 0;
        }

        if (m_uiMgr)
        {
            RectTransform rect = m_uiMgr.m_NodeUI.GetComponent<RectTransform>();
            rect.sizeDelta = new Vector2(devWidth, devHeight);

            RectTransform rect2 = m_uiMgr.m_NodeScreen.GetComponent<RectTransform>();
            rect2.sizeDelta = new Vector2(devWidth, devHeight);

            RectTransform rect3 = m_uiMgr.m_NodeLoading.GetComponent<RectTransform>();
            rect3.sizeDelta = new Vector2(devWidth, devHeight);
        }
        Debug.Log("Screen.width:" + Screen.width + ", Screen.height:" + Screen.height);
        Debug.Log("useWidth:" + useWidth.ToString() + ", useHeight:" + useHeight.ToString());
    }
}