using System.Runtime.InteropServices;

namespace SinMaiLauncher.Interops
{
    public class WindowInterops
    {
        private static class NativeWindow
        {
            [DllImport("user32.dll", SetLastError = true)]
            public static extern nint SetParent(nint hWndChild, nint hWndNewParent);

            [DllImport("user32.dll", SetLastError = true)]
            public static extern bool SetWindowLong(nint hWnd, int nIndex, uint dwNewLong);

            // 获取窗口样式
            [DllImport("user32.dll")]
            public static extern uint GetWindowLong(IntPtr hWnd, int nIndex);

            [DllImport("user32.dll", SetLastError = true)]
            public static extern bool GetWindowRect(nint hWnd, out RECT lpRect);

            [DllImport("user32.dll")]
            [return: MarshalAs(UnmanagedType.Bool)]
            private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

            [DllImport("user32.dll", SetLastError = true)]
            public static extern bool MoveWindow(nint hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);

            public const int GWL_STYLE = -16;

            public struct RECT
            {
                public int Left, Top, Right, Bottom;
            }

            public static class WindowStyles
            {
                public const uint WS_OVERLAPPED = 0x00000000;
                public const uint WS_POPUP = 0x80000000;
                public const uint WS_CHILD = 0x40000000;
                public const uint WS_MINIMIZE = 0x20000000;
                public const uint WS_VISIBLE = 0x10000000;
                public const uint WS_DISABLED = 0x08000000;
                public const uint WS_CLIPSIBLINGS = 0x04000000;
                public const uint WS_CLIPCHILDREN = 0x02000000;
                public const uint WS_MAXIMIZE = 0x01000000;
                public const uint WS_CAPTION = 0x00C00000;
                public const uint WS_BORDER = 0x00800000;
                public const uint WS_DLGFRAME = 0x00400000;
                public const uint WS_VSCROLL = 0x00200000;
                public const uint WS_HSCROLL = 0x00100000;
                public const uint WS_SYSMENU = 0x00080000;
                public const uint WS_THICKFRAME = 0x00040000;
                public const uint WS_GROUP = 0x00020000;
                public const uint WS_TABSTOP = 0x00010000;
                public const uint WS_MINIMIZEBOX = 0x00020000;
                public const uint WS_MAXIMIZEBOX = 0x00010000;
            }
        }

        public static void RemoveBorderVisible(IntPtr hWnd)
        {
            var oldVal = NativeWindow.GetWindowLong(hWnd, NativeWindow.GWL_STYLE);
            if (oldVal != NativeWindow.WindowStyles.WS_VISIBLE)
                NativeWindow.SetWindowLong(hWnd, NativeWindow.GWL_STYLE, NativeWindow.WindowStyles.WS_VISIBLE);
        }

        public static void SetParent(IntPtr hWnd, IntPtr hWndContainer)
        {
            NativeWindow.SetParent(hWnd, hWndContainer);
        }

        public static void FillWindow(IntPtr hWnd, Control container)
        {
            var rect = container.ClientRectangle;

            // 调整控制台窗口大小，使其填满容器
            NativeWindow.MoveWindow(hWnd, rect.Left, rect.Top, rect.Width, rect.Height, true);
        }

        public static bool RemoveBorderPopup(IntPtr hWnd)
        {
            var oldVal = NativeWindow.GetWindowLong(hWnd, NativeWindow.GWL_STYLE);
            if (oldVal != NativeWindow.WindowStyles.WS_POPUP)
                return NativeWindow.SetWindowLong(hWnd, NativeWindow.GWL_STYLE, NativeWindow.WindowStyles.WS_POPUP);
            return true;
        }

        public enum MoveWindowResult
        {
            Success,
            NoChange,
            FailGet,
            FailSet,
        }

        public static MoveWindowResult MoveWindow(IntPtr hWnd, int x, int y, int w, int h)
        {
            if (NativeWindow.GetWindowRect(hWnd, out var rc))
            {
                if (x != rc.Left ||
                    y != rc.Top ||
                    w != (rc.Right - rc.Left) ||
                    h != (rc.Bottom - rc.Top))
                {
                    return NativeWindow.MoveWindow(hWnd, x, y, w, h, false)
                        ? MoveWindowResult.Success
                        : MoveWindowResult.FailSet
                        ;
                }

                return MoveWindowResult.NoChange;
            }

            return MoveWindowResult.FailGet;
        }
    }
}