using System;
using System.Windows;
using System.Windows.Interop;
using System.Runtime.InteropServices;

namespace Conjure.Arcade.Overlay
{
    public class OverlayWindow : Window
    {
        [DllImport("user32.dll")]
        private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
        
        [DllImport("user32.dll")]
        private static extern int GetWindowLong(IntPtr hWnd, int nIndex);

        private const int GWL_EXSTYLE = -20;
        private const int WS_EX_TRANSPARENT = 0x20;
        private const int WS_EX_LAYERED = 0x80000;
        private bool _isClickThrough = true;

        public OverlayWindow()
        {
            // Make window transparent and click-through
            WindowStyle = WindowStyle.None;
            AllowsTransparency = true;
            Background = null;
            Topmost = true;
            ShowInTaskbar = false;

            // Handle window creation
            SourceInitialized += OnSourceInitialized;
        }

        private void OnSourceInitialized(object? sender, EventArgs e)
        {
            var hwnd = new WindowInteropHelper(this).Handle;
            var extendedStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
            SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TRANSPARENT | WS_EX_LAYERED);
        }

        public void SetClickThrough(bool enabled)
        {
            var hwnd = new WindowInteropHelper(this).Handle;
            var extendedStyle = GetWindowLong(hwnd, GWL_EXSTYLE);

            if (enabled)
                extendedStyle |= WS_EX_TRANSPARENT;
            else
                extendedStyle &= ~WS_EX_TRANSPARENT;

            SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle);
            _isClickThrough = enabled;
        }
    }
}