using System.Windows;
using System.Windows.Controls;
using Microsoft.Extensions.DependencyInjection;
using OrpaonVision.ConfigApp.Infrastructure.Services;

namespace OrpaonVision.ConfigApp.Infrastructure.Controls;

/// <summary>
/// 权限控制附加属性，用于控制UI元素的可见性和启用状态。
/// </summary>
public static class PermissionControl
{
    /// <summary>
    /// 权限编码附加属性。
    /// </summary>
    public static readonly DependencyProperty PermissionCodeProperty =
        DependencyProperty.RegisterAttached(
            "PermissionCode",
            typeof(string),
            typeof(PermissionControl),
            new PropertyMetadata(null, OnPermissionCodeChanged));

    /// <summary>
    /// 控制类型附加属性（Visible/Enabled）。
    /// </summary>
    public static readonly DependencyProperty ControlTypeProperty =
        DependencyProperty.RegisterAttached(
            "ControlType",
            typeof(PermissionControlType),
            typeof(PermissionControl),
            new PropertyMetadata(PermissionControlType.Visible, OnControlTypeChanged));

    /// <summary>
    /// 当前用户ID附加属性。
    /// </summary>
    public static readonly DependencyProperty CurrentUserIdProperty =
        DependencyProperty.RegisterAttached(
            "CurrentUserId",
            typeof(Guid),
            typeof(PermissionControl),
            new PropertyMetadata(Guid.Empty, OnCurrentUserIdChanged));

    /// <summary>
    /// 获取权限编码。
    /// </summary>
    public static string GetPermissionCode(DependencyObject obj)
    {
        return (string)obj.GetValue(PermissionCodeProperty);
    }

    /// <summary>
    /// 设置权限编码。
    /// </summary>
    public static void SetPermissionCode(DependencyObject obj, string value)
    {
        obj.SetValue(PermissionCodeProperty, value);
    }

    /// <summary>
    /// 获取控制类型。
    /// </summary>
    public static PermissionControlType GetControlType(DependencyObject obj)
    {
        return (PermissionControlType)obj.GetValue(ControlTypeProperty);
    }

    /// <summary>
    /// 设置控制类型。
    /// </summary>
    public static void SetControlType(DependencyObject obj, PermissionControlType value)
    {
        obj.SetValue(ControlTypeProperty, value);
    }

    /// <summary>
    /// 获取当前用户ID。
    /// </summary>
    public static Guid GetCurrentUserId(DependencyObject obj)
    {
        return (Guid)obj.GetValue(CurrentUserIdProperty);
    }

    /// <summary>
    /// 设置当前用户ID。
    /// </summary>
    public static void SetCurrentUserId(DependencyObject obj, Guid value)
    {
        obj.SetValue(CurrentUserIdProperty, value);
    }

    private static void OnPermissionCodeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        UpdateControlState(d);
    }

    private static void OnControlTypeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        UpdateControlState(d);
    }

    private static void OnCurrentUserIdChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        UpdateControlState(d);
    }

    private static void UpdateControlState(DependencyObject d)
    {
        if (d is not FrameworkElement element)
            return;

        var permissionCode = GetPermissionCode(element);
        var controlType = GetControlType(element);
        var currentUserId = GetCurrentUserId(element);

        // 如果没有设置权限编码或用户ID，默认拒绝访问（安全优先原则）
        if (string.IsNullOrEmpty(permissionCode) || currentUserId == Guid.Empty)
        {
            SetElementState(element, controlType, false);
            return;
        }

        // 检查权限
        var hasPermission = CheckUserPermission(currentUserId, permissionCode);
        SetElementState(element, controlType, hasPermission);
    }

    private static void SetElementState(FrameworkElement element, PermissionControlType controlType, bool isAllowed)
    {
        switch (controlType)
        {
            case PermissionControlType.Visible:
                element.Visibility = isAllowed ? Visibility.Visible : Visibility.Collapsed;
                break;
            case PermissionControlType.Enabled:
                if (element is Control control)
                {
                    control.IsEnabled = isAllowed;
                }
                break;
        }
    }

    private static bool CheckUserPermission(Guid userId, string permissionCode)
    {
        try
        {
            // 从应用程序服务容器获取权限服务
            var serviceProvider = ((App)Application.Current).ServiceProvider;
            var authorizationService = serviceProvider.GetService<IAuthorizationService>();
            
            if (authorizationService == null)
            {
                // 如果权限服务不可用，默认拒绝访问（安全优先原则）
                return false;
            }

            var result = authorizationService.CheckUserHasPermission(userId, permissionCode);
            return result.Succeeded && result.Data;
        }
        catch
        {
            // 异常情况下默认拒绝访问（安全优先原则）
            return false;
        }
    }
}

/// <summary>
/// 权限控制类型。
/// </summary>
public enum PermissionControlType
{
    /// <summary>
    /// 控制可见性。
    /// </summary>
    Visible,

    /// <summary>
    /// 控制启用状态。
    /// </summary>
    Enabled
}