using DeviceEditModule.ViewModels;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Interop;

namespace DeviceEditModule.Views
{
    /// <summary>
    /// DialogMangerView 代码后置。
    /// 负责处理与 Window 相关的操作（最小化），ViewModel 通过事件通知，
    /// 此处执行 P/Invoke，绕过 WPF 在 AllowsTransparency=True 时禁止
    /// 直接设置 WindowState.Minimized 的限制。
    /// </summary>
    public partial class DialogMangerView : UserControl
    {
        #region P/Invoke

        [DllImport("user32.dll")]
        private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        /// <summary>SW_MINIMIZE：最小化到任务栏。</summary>
        private const int SW_MINIMIZE = 6;
        /// <summary>SW_RESTORE：激活并显示窗口。如果窗口最小化或最大化，系统会将其还原到原始大小和位置。</summary>
        private const int SW_RESTORE = 9;
        #endregion

        public DialogMangerView()
        {
            InitializeComponent();

            // 在 Loaded 后订阅 ViewModel 的最小化请求事件
            Loaded += (_, _) =>
            {
                if (DataContext is DialogMangerViewModel vm)
                {
                    vm.MinimizeRequested += OnMinimizeRequested;
                    vm.RestoreRequested += OnRestoreRequested;
                }
                    
            };

            // 在 Unloaded 时取消订阅，防止内存泄漏
            Unloaded += (_, _) =>
            {
                if (DataContext is DialogMangerViewModel vm)
                {
                    vm.MinimizeRequested -= OnMinimizeRequested;
                    vm.RestoreRequested -= OnRestoreRequested;
                }
                    
            };
        }
        private void OnRestoreRequested(object? sender, EventArgs e)
        {
            var window = Window.GetWindow(this);
            if (window == null) return;

            var hwnd = new WindowInteropHelper(window).EnsureHandle();

            // 使用 Win32 API 强行恢复窗口，绕过 WPF 的 AllowsTransparency 限制
            ShowWindow(hwnd, SW_RESTORE);
        }
        private void OnMinimizeRequested(object? sender, System.EventArgs e)
        {
            var window = Window.GetWindow(this);
            if (window == null) return;

            var hwnd = new WindowInteropHelper(window).EnsureHandle();
            ShowWindow(hwnd, SW_MINIMIZE);
        }

        /// <summary>标题栏拖拽移动窗口。</summary>
        private void MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
                Window.GetWindow(this)?.DragMove();
        }
    }
}