using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using log4net;

namespace CncSimulator.Core
{
    public class LogEntry
    {
        public DateTime Timestamp { get; set; }
        public int DeviceCount { get; set; }
        public string KeyData { get; set; }
        public string FullJson { get; set; }
        public long DurationMs { get; set; }
    }

    /// <summary>日志记录器：内存环形缓冲 + 文件日志输出</summary>
    public class LogRecorder
    {
        private readonly int _capacity;
        private readonly List<LogEntry> _buffer = new List<LogEntry>();
        private readonly object _lock = new object();
        private static readonly ILog _logger = LogManager.GetLogger(typeof(LogRecorder));

        public LogRecorder(int capacity = 200)
        {
            _capacity = capacity;
        }

        public void Record(int deviceCount, string keyData, string fullJson, long durationMs)
        {
            var entry = new LogEntry
            {
                Timestamp = DateTime.Now,
                DeviceCount = deviceCount,
                KeyData = keyData,
                FullJson = fullJson,
                DurationMs = durationMs
            };
            lock (_lock)
            {
                _buffer.Add(entry);
                if (_buffer.Count > _capacity) _buffer.RemoveAt(0);
            }
            // 触发日志到文件输出
            _logger.Info($"[{entry.Timestamp:yyyy-MM-dd HH:mm:ss}] D={deviceCount} Key={keyData} Dur={durationMs}ms");
        }

        public List<LogEntry> GetRecentLogs(int count)
        {
            lock (_lock)
            {
                return _buffer.Skip(Math.Max(0, _buffer.Count - count)).Take(count).ToList();
            }
        }

        public LogEntry GetLatest()
        {
            lock (_lock)
            {
                return _buffer.Count == 0 ? null : _buffer[_buffer.Count - 1];
            }
        }
    }
}