using Avalonia.Media;

namespace YZWater.Avalonia.Controls;

/// <summary>
/// PLC 连接状态辅助类 - 供自定义控件订阅连接状态变化，实现断线降级显示。
/// 遵循 ISA-101 标准：断线时控件停止动画、变灰、叠加"通信中断"标记。
/// </summary>
internal static class ConnectionStateHelper
{
    /// <summary>连接状态变化事件</summary>
    public static event Action<bool>? StateChanged;

    /// <summary>当前是否已连接</summary>
    public static bool IsConnected { get; private set; } = true;

    /// <summary>断线态灰色画刷（统一降级视觉）</summary>
    public static IBrush DisconnectedGray { get; } = new SolidColorBrush(Color.Parse("#6B7280"));

    /// <summary>断线态文字画刷</summary>
    public static IBrush DisconnectedText { get; } = new SolidColorBrush(Color.Parse("#9CA3AF"));

    /// <summary>断线警告色（橙黄）</summary>
    public static IBrush DisconnectedWarning { get; } = new SolidColorBrush(Color.Parse("#F5A524"));

    /// <summary>半透明遮罩（用于叠加在控件上表示数据失效）</summary>
    public static IBrush OverlayBrush { get; } = new SolidColorBrush(Color.Parse("#000000"), 0.25);

    /// <summary>
    /// 设置连接状态（由 App 层在连接状态变化时调用）
    /// </summary>
    public static void SetConnected(bool connected)
    {
        if (IsConnected == connected) return;
        IsConnected = connected;
        StateChanged?.Invoke(connected);
    }
}