using Serilog;

namespace MasstransferCommon.Events;

/// <summary>
///     事件总线
/// </summary>
/// <typeparam name="T"></typeparam>
public abstract class EventBus<T>
{
    private static readonly Dictionary<EventType, List<Delegate>> Subscribers = new();

    /// <summary>
    ///     添加订阅
    /// </summary>
    /// <param name="type"></param>
    /// <param name="action"></param>
    public static void AddEventHandler(EventType type, Delegate action)
    {
        if (Subscribers.TryGetValue(type, out var subscribers))
        {
            var any = subscribers.Any(item => item.Equals(action));
            if (!any) subscribers.Add(action);
        }
        else
        {
            Subscribers.Add(type, [action]);
        }
    }

    /// <summary>
    ///     移除订阅逻辑
    /// </summary>
    /// <param name="type">事件类型</param>
    /// <param name="action">回调方法</param>
    public static void RemoveEventHandler(EventType type, Delegate action)
    {
        if (!Subscribers.TryGetValue(type, out var handlers)) return;

        handlers.Remove(action);
    }

    /// <summary>
    ///     发布事件
    /// </summary>
    /// <param name="type"></param>
    /// <param name="data"></param>
    public static void Publish(EventType type, T data)
    {
        if (!Subscribers.TryGetValue(type, out var subscribers)) return;

        // 创建一个副本，避免在回调中修改订阅列表导致迭代异常
        var actions = subscribers.ToList();

        foreach (var action in actions)
            try
            {
                action.DynamicInvoke(type, data);
            }
            catch (Exception e)
            {
                Log.Error(e, e.Message);
            }
    }
}