using System;
using System.Collections;
#if UNITY_STANDALONE_WIN
using System.Runtime.InteropServices;
#endif 
using UnityEngine;

namespace GeneralTools
{
    public class WindowMod : SingletonBaseAttribute<WindowMod>
    {
#if UNITY_STANDALONE_WIN
        [DllImport("user32.dll")]
        static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool SetWindowPos(IntPtr hWnd, IntPtr hPos, int x, int y, int cx, int cy, uint nflags);

        [DllImport("User32.dll", EntryPoint = "FindWindow", CharSet = CharSet.Auto)]
        private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

        [DllImport("User32.dll", EntryPoint = "SetWindowLong")]
        private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

        [DllImport("User32.dll", EntryPoint = "GetWindowLong")]
        private static extern int GetWindowLong(IntPtr hWnd, int dwNewLong);

        [DllImport("User32.dll", EntryPoint = "MoveWindow")]
        private static extern bool MoveWindow(IntPtr hWnd, int x, int y, int width, int height, bool repaint);

        [DllImport("user32.dll", EntryPoint = "ShowWindow", CharSet = CharSet.Auto)]
        public static extern int ShowWindow(IntPtr hwnd, int nCmdShow);

        [DllImport("user32.dll", EntryPoint = "SendMessage", CharSet = CharSet.Auto)]
        public static extern int SendMessage(IntPtr hwnd, int msg, IntPtr wP, IntPtr IP);

        [DllImport("user32.dll", EntryPoint = "SetParent", CharSet = CharSet.Auto)]
        public static extern IntPtr SetParent(IntPtr hChild, IntPtr hParent);

        [DllImport("user32.dll", EntryPoint = "GetParent", CharSet = CharSet.Auto)]
        public static extern IntPtr GetParent(IntPtr hChild);

        [DllImport("User32.dll", EntryPoint = "GetSystemMetrics")]
        public static extern IntPtr GetSystemMetrics(int nIndex);

        [DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        public enum appStyle
        {
            WindowedFullScreen = 0,
            Windowed = 1,
            WindowedWithoutBorder = 2,
        }
        protected appStyle AppWindowStyle = appStyle.WindowedFullScreen;
        protected int AppWindowStyleInt = 0;
        public enum zDepth
        {
            Bottom = -1,
            Normal = 0,
            Top = 1,
            TopMost = 2,
        }
        protected zDepth ScreenDepth = zDepth.Normal;
        protected int windowLeft = 0;
        protected int windowTop = 0;
        private int windowWidth = Screen.width;
        private int windowHeight = Screen.height;
        const uint SWP_SHOWWINDOW = 0x0040;
        const int GWL_STYLE = -16;
        const int WS_BORDER = 1;
        const int SW_SHOWRESTORE = 1;//还原
        const int SW_SHOWMINIMIZED = 2;//(最小化窗口)
        const int SW_SHOWMAXIMIZED = 3;//最大化
        private Rect screenPosition;
        private const int GWL_EXSTYLE = -20;
        private const int WS_CAPTION = 0xC00000;
        private const int WS_POPUP = 0x800000;
        IntPtr HWND_BOTTOM = new IntPtr(1);
        IntPtr HWND_NORMAL = new IntPtr(-2);
        IntPtr HWND_TOP = new IntPtr(0);
        IntPtr HWND_TOPMOST = new IntPtr(-1);
        private const int SM_CXSCREEN = 0x00000000;
        private const int SM_CYSCREEN = 0x00000001;
        int Xscreen;
        int Yscreen;
        IntPtr hWnd;
        public override void IAwake()
        {
            hWnd = FindWindow(null, Application.productName);
            windowWidth = ConfigHelper.screen_width;
            windowHeight = ConfigHelper.screen_height;
            windowLeft = ConfigHelper.window_Left;
            windowTop = ConfigHelper.window_Top;
            AppWindowStyle = (appStyle)ConfigHelper.fullscreen;
            ScreenDepth = (zDepth)ConfigHelper.screenDepth;
            InitScreen();
        }
        public override void IStart()
        {
            base.IStart();

            KeyDownManager.Instance.AddKeyDownAction(KeyCode.LeftArrow, () => { ChangeScreenPosition(new Vector2(-5, 0)); }, "窗口左移", true, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.RightArrow, () => { ChangeScreenPosition(new Vector2(5, 0)); }, "窗口右移", true, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.UpArrow, () => { ChangeScreenPosition(new Vector2(0, -5)); }, "窗口上移", true, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.DownArrow, () => { ChangeScreenPosition(new Vector2(0, 5)); }, "窗口下移", true, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.F9, () => { InitScreen(); }, "窗口初始化", false, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.F10, () => { SetMinWindow(); }, "最小化", false, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.F11, () => { SetMaxWindow(); }, "最大化", false, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.F12, () => { SetNormalWindow(); }, "还原", false, 0);
            KeyDownManager.Instance.AddKeyDownAction(KeyCode.LeftControl, () => { Cursor.visible = !Cursor.visible; }, "显示/隐藏鼠标", false, 0);
        }
        void InitScreen()
        {
            if (Application.isEditor)
            {
                return;
            }
            Xscreen = (int)GetSystemMetrics(SM_CXSCREEN);
            Yscreen = (int)GetSystemMetrics(SM_CYSCREEN);

            if (AppWindowStyle == 0)
            {
                Screen.SetResolution(Xscreen, Yscreen, true);
            }
            else if ((int)AppWindowStyle == 1)
            {
                Screen.SetResolution(windowWidth, windowHeight, false);
            }
            else if ((int)AppWindowStyle == 2)
            {
                Screen.SetResolution(windowWidth, windowHeight, false);
                screenPosition = new Rect(windowLeft, windowTop, windowWidth, windowHeight);
            }
            StartCoroutine(IE_SetWindows());
            Cursor.visible = ConfigHelper.showcursor;
            Application.targetFrameRate = ConfigHelper.targetFramerate;
        }
        IEnumerator IE_SetWindows()
        {
            yield return new WaitForEndOfFrame();
            yield return new WaitForFixedUpdate();
            SetWindows();
        }
        private void ChangeScreenPosition(Vector2 pos)
        {
            screenPosition.x += pos.x;
            screenPosition.y += pos.y;
            StartCoroutine(IE_SetWindows());
        }
        private void SetWindows()
        {
            if (hWnd == null)
            {
                Debug.LogError("未获取到窗口句柄");
                return;
            }
            if (AppWindowStyle == 0)
            {
                SetWindowLong(hWnd, -16, 369164288);
                if ((int)ScreenDepth == -1)
                    SetWindowPos(hWnd, HWND_BOTTOM, 0, 0, (int)GetSystemMetrics(SM_CXSCREEN), (int)GetSystemMetrics(SM_CYSCREEN), SWP_SHOWWINDOW);
                if (ScreenDepth == 0)
                    SetWindowPos(hWnd, HWND_NORMAL, 0, 0, (int)GetSystemMetrics(SM_CXSCREEN), (int)GetSystemMetrics(SM_CYSCREEN), SWP_SHOWWINDOW);
                if ((int)ScreenDepth == 1)
                    SetWindowPos(hWnd, HWND_TOP, 0, 0, (int)GetSystemMetrics(SM_CXSCREEN), (int)GetSystemMetrics(SM_CYSCREEN), SWP_SHOWWINDOW);
                if ((int)ScreenDepth == 2)
                    SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, (int)GetSystemMetrics(SM_CXSCREEN), (int)GetSystemMetrics(SM_CYSCREEN), SWP_SHOWWINDOW);
            }
            if ((int)AppWindowStyle == 1)
            {
                if ((int)ScreenDepth == -1)
                {
                    SetWindowPos(hWnd, HWND_BOTTOM, 0, 0, 0, 0, 0x0001 | 0x0002);
                    SetWindowPos(hWnd, HWND_BOTTOM, 0, 0, 0, 0, 0x0001 | 0x0002 | 0x0020);
                }
                if (ScreenDepth == 0)
                {
                    SetWindowPos(hWnd, HWND_NORMAL, 0, 0, 0, 0, 0x0001 | 0x0002);
                    SetWindowPos(hWnd, HWND_NORMAL, 0, 0, 0, 0, 0x0001 | 0x0002 | 0x0020);
                }
                if ((int)ScreenDepth == 1)
                {
                    SetWindowPos(hWnd, HWND_TOP, 0, 0, 0, 0, 0x0001 | 0x0002);
                    SetWindowPos(hWnd, HWND_TOP, 0, 0, 0, 0, 0x0001 | 0x0002 | 0x0020);
                }
                if ((int)ScreenDepth == 2)
                {
                    SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, 0x0001 | 0x0002);
                    SetWindowPos(hWnd, HWND_TOPMOST, 0, 0, 0, 0, 0x0001 | 0x0002 | 0x0020);
                }
            }
            if ((int)AppWindowStyle == 2)
            {
                SetWindowLong(hWnd, -16, 369164288);
                if ((int)ScreenDepth == -1)
                    SetWindowPos(hWnd, HWND_BOTTOM, (int)screenPosition.x, (int)screenPosition.y, (int)screenPosition.width, (int)screenPosition.height, SWP_SHOWWINDOW);
                if (ScreenDepth == 0)
                    SetWindowPos(hWnd, HWND_NORMAL, (int)screenPosition.x, (int)screenPosition.y, (int)screenPosition.width, (int)screenPosition.height, SWP_SHOWWINDOW);
                if ((int)ScreenDepth == 1)
                    SetWindowPos(hWnd, HWND_TOP, (int)screenPosition.x, (int)screenPosition.y, (int)screenPosition.width, (int)screenPosition.height, SWP_SHOWWINDOW);
                if ((int)ScreenDepth == 2)
                    SetWindowPos(hWnd, HWND_TOPMOST, (int)screenPosition.x, (int)screenPosition.y, (int)screenPosition.width, (int)screenPosition.height, SWP_SHOWWINDOW);
            }
        }

        //最小化窗口
        public void SetMinWindow()
        {
            if (hWnd == null)
            {
                Debug.LogError("未获取到窗口句柄");
            }
            if (!Application.isEditor)
            {
                ShowWindow(hWnd, SW_SHOWMINIMIZED);
            }
        }
        //恢复窗口
        public void SetNormalWindow()
        {
            if (hWnd == null)
            {
                Debug.LogError("未获取到窗口句柄");
            }
            if (!Application.isEditor)
            {
                ShowWindow(hWnd, SW_SHOWRESTORE);
            }
        }
        //最大化窗口
        public void SetMaxWindow()
        {
            if (hWnd == null)
            {
                Debug.LogError("未获取到窗口句柄");
            }
            if (!Application.isEditor)
            {
                ShowWindow(hWnd, SW_SHOWMAXIMIZED);
            }
        }
        //置底窗口
        public void SetWindowBottom()
        {
            ScreenDepth = zDepth.Bottom;
            InitScreen();
        }
        //置顶窗口
        public void SetWindowTop()
        {
            ScreenDepth = zDepth.Top;
            InitScreen();
        }
        //永久置顶窗口
        public void SetWindowTopMost()
        {
            ScreenDepth = zDepth.TopMost;
            InitScreen();
        }
#endif
    }
}