using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;

namespace StandardScene.Charge
{
    /// <summary>
    /// 通讯监控窗体
    /// </summary>
    public partial class CommunicationMonitorForm : Form
    {
        private readonly CommunicationMessageService messageService;
        private bool isFormLoaded = false;
        private bool isFormMessageStop = false;
        private const int MaxDisplayRows = 100;
        private const int UiBatchSize = 20;
        private const int StatsRefreshMs = 500;
        private readonly Queue<CommunicationMessage> pendingMessages = new Queue<CommunicationMessage>();
        private readonly object pendingMessagesLock = new object();
        private readonly Timer uiFlushTimer;
        private readonly Timer statsRefreshTimer;
        private bool pendingStatsRefresh = false;
        private int lastDisplayCountForStats = 0;
        public CommunicationMonitorForm()
        {
            InitializeComponent();
            messageService = CommunicationMessageService.Instance;
            uiFlushTimer = new Timer { Interval = 500 };
            uiFlushTimer.Tick += UiFlushTimer_Tick;
            statsRefreshTimer = new Timer { Interval = StatsRefreshMs };
            statsRefreshTimer.Tick += StatsRefreshTimer_Tick;

            // 订阅窗体关闭事件
            this.FormClosing += CommunicationMonitorForm_FormClosing;
        }

        private void CommunicationMonitorForm_Load(object sender, EventArgs e)
        {
            try
            {
                InitializeForm();
                LoadMessages();

                // 标记窗体已加载完成
                isFormLoaded = true;
                uiFlushTimer.Start();
                statsRefreshTimer.Start();

                // 在窗体加载完成后再订阅报文添加事件（避免在初始化期间触发）
                messageService.MessageAdded += OnMessageAdded;
            }
            catch (Exception ex)
            {
                MessageBox.Show($"窗体加载失败: {ex.Message}\r\n{ex.StackTrace}", "错误",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void InitializeForm()
        {
            this.Text = "通讯监控";
            this.Size = new Size(1400, 800);
            this.StartPosition = FormStartPosition.CenterScreen;
            this.MinimumSize = new Size(1200, 600);

            // 初始化IP筛选下拉框
            RefreshIpFilter();
        }

        /// <summary>
        /// 刷新IP筛选下拉框
        /// </summary>
        private void RefreshIpFilter()
        {
            try
            {
                if (cmbIpFilter == null || messageService == null)
                    return;

                var selectedIp = cmbIpFilter.SelectedItem?.ToString();

                cmbIpFilter.Items.Clear();
                cmbIpFilter.Items.Add("全部");

                var ipAddresses = messageService.GetUniqueIpAddresses();
                if (ipAddresses != null)
                {
                    foreach (var ip in ipAddresses)
                    {
                        if (!string.IsNullOrEmpty(ip))
                        {
                            cmbIpFilter.Items.Add(ip);
                        }
                    }
                }

                // 恢复选中项
                if (!string.IsNullOrEmpty(selectedIp) && cmbIpFilter.Items.Contains(selectedIp))
                {
                    cmbIpFilter.SelectedItem = selectedIp;
                }
                else if (cmbIpFilter.Items.Count > 0)
                {
                    cmbIpFilter.SelectedIndex = 0;
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"刷新IP筛选失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 加载报文列表
        /// </summary>
        private void LoadMessages()
        {
            var layoutSuspended = false;
            try
            {
                if (dgvMessages == null|| isFormMessageStop)
                    return;

                var selectedIp = cmbIpFilter?.SelectedItem?.ToString();
                var messages = string.IsNullOrEmpty(selectedIp) || selectedIp == "全部"
                    ? messageService.GetAllMessages()
                    : messageService.GetMessagesByIp(selectedIp);

                dgvMessages.SuspendLayout();
                layoutSuspended = true;
                dgvMessages.Rows.Clear();

                foreach (var msg in messages)
                {
                    AddMessageRow(msg, false);
                }

                UpdateStatistics(messages.Count);
                pendingStatsRefresh = false;
            }
            catch (Exception ex)
            {
                MessageBox.Show($"加载报文失败: {ex.Message}", "错误",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                if (layoutSuspended && dgvMessages != null)
                {
                    dgvMessages.ResumeLayout();
                }
            }
        }

        /// <summary>
        /// 定时批量刷新UI，避免每条报文都抢占UI线程
        /// </summary>
        private void UiFlushTimer_Tick(object sender, EventArgs e)
        {
            if (!isFormLoaded || isFormMessageStop)
                return;

            List<CommunicationMessage> batch = null;
            lock (pendingMessagesLock)
            {
                if (pendingMessages.Count == 0)
                    return;

                int count = Math.Min(UiBatchSize, pendingMessages.Count);
                batch = new List<CommunicationMessage>(count);
                for (int i = 0; i < count; i++)
                {
                    batch.Add(pendingMessages.Dequeue());
                }
            }

            if (batch == null || batch.Count == 0)
                return;

            dgvMessages.SuspendLayout();
            try
            {
                var selectedIp = cmbIpFilter?.SelectedItem?.ToString();
                bool displayChanged = false;

                foreach (var message in batch)
                {
                    EnsureIpInFilter(message.IpAddress);
                    if (string.IsNullOrEmpty(selectedIp) || selectedIp == "全部" || selectedIp == message.IpAddress)
                    {
                        AddMessageRow(message, true);
                        displayChanged = true;
                    }
                }

                if (displayChanged)
                {
                    RequestStatisticsRefresh(dgvMessages.Rows.Count);
                }
            }
            finally
            {
                dgvMessages.ResumeLayout();
            }
        }

        /// <summary>
        /// 统计信息低频刷新（500ms）
        /// </summary>
        private void StatsRefreshTimer_Tick(object sender, EventArgs e)
        {
            if (!isFormLoaded || isFormMessageStop || !pendingStatsRefresh)
                return;

            pendingStatsRefresh = false;
            UpdateStatistics(lastDisplayCountForStats);
        }

        private void RequestStatisticsRefresh(int displayCount)
        {
            lastDisplayCountForStats = displayCount;
            pendingStatsRefresh = true;
        }

        private void EnsureIpInFilter(string ipAddress)
        {
            if (cmbIpFilter == null || string.IsNullOrWhiteSpace(ipAddress))
                return;

            if (!cmbIpFilter.Items.Contains(ipAddress))
            {
                cmbIpFilter.Items.Add(ipAddress);
            }
        }

        /// <summary>
        /// 向表格新增一条报文行（支持头部插入）
        /// </summary>
        private void AddMessageRow(CommunicationMessage msg, bool insertAtTop = true)
        {
            if (msg == null || dgvMessages == null)
                return;

            DataGridViewRow row;
            if (insertAtTop)
            {
                dgvMessages.Rows.Insert(0,
                    msg.Timestamp.ToString("HH:mm:ss.fff"),
                    msg.Direction == MessageDirection.Send ? "发送" : "接收",
                    msg.IpAddress,
                    msg.Port,
                    msg.Length,
                    msg.RawData,
                    msg.StationId ?? "-",
                    msg.Type);
                row = dgvMessages.Rows[0];
            }
            else
            {
                var index = dgvMessages.Rows.Add(
                    msg.Timestamp.ToString("HH:mm:ss.fff"),
                    msg.Direction == MessageDirection.Send ? "发送" : "接收",
                    msg.IpAddress,
                    msg.Port,
                    msg.Length,
                    msg.RawData,
                    msg.StationId ?? "-",
                    msg.Type);
                row = dgvMessages.Rows[index];
            }

            if (msg.Direction == MessageDirection.Send)
            {
                row.DefaultCellStyle.BackColor = Color.FromArgb(232, 245, 233);
                row.DefaultCellStyle.ForeColor = Color.FromArgb(46, 125, 50);
            }
            else
            {
                row.DefaultCellStyle.BackColor = Color.FromArgb(227, 242, 253);
                row.DefaultCellStyle.ForeColor = Color.FromArgb(13, 71, 161);
            }

            while (dgvMessages.Rows.Count > MaxDisplayRows)
            {
                dgvMessages.Rows.RemoveAt(dgvMessages.Rows.Count - 1);
            }
        }

        /// <summary>
        /// 更新统计信息
        /// </summary>
        private void UpdateStatistics(int displayCount)
        {
            try
            {
                if (lblStatistics == null || messageService == null)
                    return;

                var allMessages = messageService.GetAllMessages();
                if (allMessages == null)
                    return;

                var sendCount = allMessages.Count(m => m.Direction == MessageDirection.Send);
                var receiveCount = allMessages.Count(m => m.Direction == MessageDirection.Receive);

                lblStatistics.Text = $"显示: {displayCount} | 总数: {allMessages.Count} | 发送: {sendCount} | 接收: {receiveCount}";
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"更新统计信息失败: {ex.Message}");
                if (lblStatistics != null)
                {
                    lblStatistics.Text = "统计信息加载失败";
                }
            }
        }

        /// <summary>
        /// 新报文添加事件处理（线程安全）
        /// </summary>
        private void OnMessageAdded(object sender, CommunicationMessage message)
        {
            // 如果窗体还未加载完成，忽略此事件
            if (!isFormLoaded || isFormMessageStop)
                return;

            try
            {
                if (message == null)
                {
                    return;
                }
                lock (pendingMessagesLock)
                {
                    pendingMessages.Enqueue(message);
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"处理新报文失败: {ex.Message}");
            }
        }

        /// <summary>
        /// 解析报文数据
        /// </summary>
        private void ParseMessage(CommunicationMessage message)
        {
            if (message == null || txtParsedData == null)
                return;

            try
            {
                var parsed = new System.Text.StringBuilder();
                parsed.AppendLine("=== 报文解析 ===");
                parsed.AppendLine($"时间: {message.Timestamp:yyyy-MM-dd HH:mm:ss.fff}");
                parsed.AppendLine($"方向: {(message.Direction == MessageDirection.Send ? "发送" : "接收")}");
                parsed.AppendLine($"地址: {message.IpAddress}:{message.Port}");
                parsed.AppendLine($"站点: {message.StationId ?? "未关联"}");
                parsed.AppendLine($"长度: {message.Length} 字节");
                parsed.AppendLine();
                parsed.AppendLine("=== 原始数据 (HEX) ===");
                parsed.AppendLine(message.RawData);
               // parsed.AppendLine(FormatHexString(message.RawData));
                parsed.AppendLine();
                parsed.AppendLine("=== 数据解析 ===");

                // TODO: 根据实际协议进行解析
                parsed.AppendLine();
                if (message.Direction== MessageDirection.Send)
                {
                    var sendDate = messageService.ParseSendRawData(message.RawData, message.Type);
                    parsed.AppendLine("示例解析：");
                    parsed.AppendLine($"充电指令：{sendDate.ChargeCommand}");
                    parsed.AppendLine($"发送电压：{sendDate.SetVoltage}");
                    parsed.AppendLine($"发送电流：{sendDate.SetCurrent}");
                    parsed.AppendLine($"车辆ID：{sendDate.CurrentVehicleId}");
                    parsed.AppendLine($"车辆电量：{sendDate.BatteryLevel}");
                    parsed.AppendLine($"车辆电压：{sendDate.CarVoltage}");
                    parsed.AppendLine($"车辆电流：{sendDate.CarCurrent}");

                }
                else
                {
                   
                    var recDate = messageService.ParseReceiveRawData(message.RawData, message.Type);
                    string mechanismStatus = (int)recDate.MechanismStatus == 1 ? "伸出" : (int)recDate.MechanismStatus == 2 ? "缩回" : (int)recDate.MechanismStatus == 3 ? "运动中" : recDate.MechanismStatus.ToString();
                    parsed.AppendLine("示例解析：");
                    parsed.AppendLine($"机构状态：{mechanismStatus}");
                    parsed.AppendLine($"实时电压：{recDate.RealTimeVoltage}");
                    parsed.AppendLine($"实时电流：{recDate.RealTimeCurrent}");
                    parsed.AppendLine($"充电量： {recDate.BatteryAH}");
                    parsed.AppendLine($"是否报警：{recDate.HasAlarm}");
                    parsed.AppendLine($"充电状态：{recDate.Status.ToString()}");

                }
                   
               

                txtParsedData.Text = parsed.ToString();
            }
            catch (Exception ex)
            {
                txtParsedData.Text = $"解析失败: {ex.Message}";
            }
        }

        /// <summary>
        /// 格式化十六进制字符串
        /// </summary>
        private string FormatHexString(string hexData)
        {
            if (string.IsNullOrEmpty(hexData))
                return string.Empty;

            var formatted = new System.Text.StringBuilder();
            for (int i = 0; i < hexData.Length; i += 2)
            {
                if (i > 0 && i % 32 == 0)
                    formatted.AppendLine();
                else if (i > 0)
                    formatted.Append(" ");

                if (i + 1 < hexData.Length)
                    formatted.Append(hexData.Substring(i, 2));
                else
                    formatted.Append(hexData[i]);
            }
            return formatted.ToString();
        }

        // ==================== 事件处理 ====================

        private void cmbIpFilter_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                LoadMessages();
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"筛选改变失败: {ex.Message}");
            }
        }

        private void dgvMessages_SelectionChanged(object sender, EventArgs e)
        {
            try
            {
                if (dgvMessages.SelectedRows.Count > 0)
                {
                    var row = dgvMessages.SelectedRows[0];
                    var rawData = row.Cells[5].Value?.ToString();
                    var ipAddress = row.Cells[2].Value?.ToString();
                    var port = int.Parse(row.Cells[3].Value?.ToString() ?? "0");
                    var timeStr = row.Cells[0].Value?.ToString();
                    var directionStr = row.Cells[1].Value?.ToString();
                    var stationId = row.Cells[6].Value?.ToString();
                    var type = row.Cells[7].Value?.ToString();

                    // 构造消息对象用于解析
                    var message = new CommunicationMessage
                    {
                        RawData = rawData,
                        IpAddress = ipAddress,
                        Port = port,
                        Direction = directionStr == "发送" ? MessageDirection.Send : MessageDirection.Receive,
                        StationId = stationId == "-" ? null : stationId,
                        Length = rawData.Split(' ')?.Length  ?? 0,
                        Type=type,
                       
                    };

                    if (DateTime.TryParse(timeStr, out DateTime timestamp))
                    {
                        message.Timestamp = timestamp;
                    }

                    ParseMessage(message);
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"选择报文失败: {ex.Message}");
            }
        }

        private void btnRefresh_Click(object sender, EventArgs e)
        {
            try
            {
                RefreshIpFilter();
                LoadMessages();
                RequestStatisticsRefresh(dgvMessages?.Rows.Count ?? 0);
            }
            catch (Exception ex)
            {
                MessageBox.Show($"刷新失败: {ex.Message}", "错误",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            try
            {
                var result = MessageBox.Show(
                    "确定要清空所有报文记录吗？",
                    "确认清空",
                    MessageBoxButtons.YesNo,
                    MessageBoxIcon.Question);

                if (result == DialogResult.Yes)
                {
                    messageService.Clear();
                    RefreshIpFilter();
                    LoadMessages();
                    if (txtParsedData != null)
                    {
                        txtParsedData.Clear();
                    }
                    dgvMessages.Rows.Clear();
                    RequestStatisticsRefresh(0);
                }
             
            }
            catch (Exception ex)
            {
                MessageBox.Show($"清空报文失败: {ex.Message}", "错误",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void CommunicationMonitorForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            // 取消订阅事件
            messageService.MessageAdded -= OnMessageAdded;
            uiFlushTimer.Stop();
            uiFlushTimer.Dispose();
            statsRefreshTimer.Stop();
            statsRefreshTimer.Dispose();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            isFormMessageStop = !isFormMessageStop;
            if (sender is Button pauseButton)
            {
                pauseButton.Text = isFormMessageStop ? "继续" : "暂停";
            }
        }
    }
}