using Microsoft.Extensions.Logging;

namespace CoreAgent.WebSocketTransport.Middleware;

/// <summary>
/// 日志中间件
/// 记录发送/接收消息，跳过心跳消息如 PING/PONG
/// </summary>
public class LoggingMiddleware : IMessageMiddleware
{
    private readonly ILogger<LoggingMiddleware> _logger;
    private static readonly string[] _heartbeatMessages = { "PING", "PONG" };

    public LoggingMiddleware(ILogger<LoggingMiddleware> logger)
    {
        _logger = logger;
    }

    /// <summary>
    /// 处理发送消息，记录日志（跳过心跳消息）
    /// </summary>
    public Task<T?> ProcessSendAsync<T>(T message, CancellationToken cancellationToken = default)
    {
        if (message == null)
        {
            _logger.LogWarning("发送消息为空");
            return Task.FromResult<T?>(default);
        }

        var messageStr = message.ToString();
        
        // 跳过心跳消息的日志记录
        if (IsHeartbeatMessage(messageStr))
        {
            return Task.FromResult<T?>(message);
        }

        _logger.LogInformation("发送消息: {MessageType} - {MessageContent}", 
            typeof(T).Name, 
            messageStr);

        return Task.FromResult<T?>(message);
    }

    /// <summary>
    /// 处理接收消息，记录日志（跳过心跳消息）
    /// </summary>
    public Task<T?> ProcessReceiveAsync<T>(T message, CancellationToken cancellationToken = default)
    {
        if (message == null)
        {
            _logger.LogWarning("接收消息为空");
            return Task.FromResult<T?>(default);
        }

        var messageStr = message.ToString();
        
        // 跳过心跳消息的日志记录
        if (IsHeartbeatMessage(messageStr))
        {
            return Task.FromResult<T?>(message);
        }

        _logger.LogInformation("接收消息: {MessageType} - {MessageContent}", 
            typeof(T).Name, 
            messageStr);

        return Task.FromResult<T?>(message);
    }

    /// <summary>
    /// 判断是否为心跳消息
    /// </summary>
    private static bool IsHeartbeatMessage(string? message)
    {
        if (string.IsNullOrEmpty(message))
            return false;

        return _heartbeatMessages.Any(hb => message.Contains(hb, StringComparison.OrdinalIgnoreCase));
    }
}