using System;
using System.IO.Ports;
using System.Linq;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Windows.Forms;
using APS7100TestTool.Models;
using APS7100TestTool.Services;

namespace APS7100TestTool.Forms
{
    public partial class SettingsForm : Form
    {
        private ConfigService _configService;
        private AppSettings _settings;

        public SettingsForm()
        {
            InitializeComponent();
            _configService = new ConfigService();
            LoadSettings();
        }

        private void LoadSettings()
        {
            _settings = _configService.LoadAppSettings();
            
            // 刷新串口列表
            RefreshComPorts();

            // 刷新本地IP列表
            RefreshLocalIpAddresses();

            // APS7100 设置
            chkAutoConnectAPS7100.Checked = _settings.AutoConnectAPS7100;
            rbAPS7100Serial.Checked = _settings.APS7100ConnectionType == "Serial";
            rbAPS7100Ethernet.Checked = _settings.APS7100ConnectionType == "Ethernet";
            SelectComPort(cmbAPS7100ComPort, _settings.APS7100ComPort);
            cmbAPS7100BaudRate.Text = _settings.APS7100BaudRate.ToString();
            txtAPS7100IpAddress.Text = _settings.APS7100IpAddress;
            numAPS7100Port.Value = _settings.APS7100Port;

            // PSW250 设置
            chkAutoConnectPSW250.Checked = _settings.AutoConnectPSW250;
            rbPSW250Serial.Checked = _settings.PSW250ConnectionType == "Serial";
            rbPSW250Ethernet.Checked = _settings.PSW250ConnectionType == "Ethernet";
            SelectComPort(cmbPSW250ComPort, _settings.PSW250ComPort);
            cmbPSW250BaudRate.Text = _settings.PSW250BaudRate.ToString();
            txtPSW250IpAddress.Text = _settings.PSW250IpAddress;
            numPSW250Port.Value = _settings.PSW250Port;

            // Modbus 设置
            chkAutoStartModbus.Checked = _settings.AutoStartModbus;
            numModbusPort.Value = _settings.ModbusPort;
            SelectBindIpAddress(_settings.ModbusBindIpAddress);

            // 启动行为设置
            chkStartMinimized.Checked = _settings.StartMinimized;

            UpdateUI();
        }

        private void RefreshLocalIpAddresses()
        {
            cmbModbusBindIp.Items.Clear();
            cmbModbusBindIp.Items.Add("0.0.0.0 (所有接口)");
            
            try
            {
                // 获取所有网络接口
                foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
                {
                    // 只获取已连接的接口
                    if (ni.OperationalStatus != OperationalStatus.Up)
                        continue;

                    // 获取 IPv4 地址
                    foreach (UnicastIPAddressInformation ip in ni.GetIPProperties().UnicastAddresses)
                    {
                        if (ip.Address.AddressFamily == AddressFamily.InterNetwork)
                        {
                            string displayText = $"{ip.Address} ({ni.Name})";
                            cmbModbusBindIp.Items.Add(displayText);
                        }
                    }
                }
            }
            catch (Exception)
            {
                // 忽略获取网络接口失败
            }

            if (cmbModbusBindIp.Items.Count > 0)
                cmbModbusBindIp.SelectedIndex = 0;
        }

        private void SelectBindIpAddress(string ipAddress)
        {
            if (string.IsNullOrEmpty(ipAddress) || ipAddress == "0.0.0.0")
            {
                cmbModbusBindIp.SelectedIndex = 0;
                return;
            }

            // 查找匹配的 IP
            for (int i = 0; i < cmbModbusBindIp.Items.Count; i++)
            {
                string item = cmbModbusBindIp.Items[i].ToString();
                if (item.StartsWith(ipAddress + " ") || item == ipAddress)
                {
                    cmbModbusBindIp.SelectedIndex = i;
                    return;
                }
            }

            // 如果没找到，选择第一项
            cmbModbusBindIp.SelectedIndex = 0;
        }

        private string GetSelectedBindIpAddress()
        {
            if (cmbModbusBindIp.SelectedItem == null)
                return "0.0.0.0";

            string selected = cmbModbusBindIp.SelectedItem.ToString();
            
            // 提取 IP 地址部分（在括号之前）
            int spaceIndex = selected.IndexOf(' ');
            if (spaceIndex > 0)
                return selected.Substring(0, spaceIndex);
            
            return selected;
        }

        private void RefreshComPorts()
        {
            string[] ports = SerialPort.GetPortNames();
            
            cmbAPS7100ComPort.Items.Clear();
            cmbPSW250ComPort.Items.Clear();
            
            cmbAPS7100ComPort.Items.AddRange(ports);
            cmbPSW250ComPort.Items.AddRange(ports);
        }

        private void SelectComPort(ComboBox cmb, string portName)
        {
            if (!string.IsNullOrEmpty(portName))
            {
                int index = cmb.Items.IndexOf(portName);
                if (index >= 0) cmb.SelectedIndex = index;
            }
        }

        private void UpdateUI()
        {
            // APS7100 连接类型 UI
            bool isAPS7100Serial = rbAPS7100Serial.Checked;
            cmbAPS7100ComPort.Visible = isAPS7100Serial;
            lblAPS7100ComPort.Visible = isAPS7100Serial;
            cmbAPS7100BaudRate.Visible = isAPS7100Serial;
            lblAPS7100BaudRate.Visible = isAPS7100Serial;
            txtAPS7100IpAddress.Visible = !isAPS7100Serial;
            lblAPS7100IpAddress.Visible = !isAPS7100Serial;
            numAPS7100Port.Visible = !isAPS7100Serial;
            lblAPS7100Port.Visible = !isAPS7100Serial;

            // PSW250 连接类型 UI
            bool isPSW250Serial = rbPSW250Serial.Checked;
            cmbPSW250ComPort.Visible = isPSW250Serial;
            lblPSW250ComPort.Visible = isPSW250Serial;
            cmbPSW250BaudRate.Visible = isPSW250Serial;
            lblPSW250BaudRate.Visible = isPSW250Serial;
            txtPSW250IpAddress.Visible = !isPSW250Serial;
            lblPSW250IpAddress.Visible = !isPSW250Serial;
            numPSW250Port.Visible = !isPSW250Serial;
            lblPSW250Port.Visible = !isPSW250Serial;
        }

        private void rbAPS7100_CheckedChanged(object sender, EventArgs e) => UpdateUI();
        private void rbPSW250_CheckedChanged(object sender, EventArgs e) => UpdateUI();

        private void btnRefreshPorts_Click(object sender, EventArgs e)
        {
            RefreshComPorts();
            MessageBox.Show("串口列表已刷新", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            try
            {
                // APS7100 设置
                _settings.AutoConnectAPS7100 = chkAutoConnectAPS7100.Checked;
                _settings.APS7100ConnectionType = rbAPS7100Serial.Checked ? "Serial" : "Ethernet";
                _settings.APS7100ComPort = cmbAPS7100ComPort.SelectedItem?.ToString() ?? "";
                _settings.APS7100BaudRate = int.TryParse(cmbAPS7100BaudRate.Text, out int br1) ? br1 : 9600;
                _settings.APS7100IpAddress = txtAPS7100IpAddress.Text.Trim();
                _settings.APS7100Port = (int)numAPS7100Port.Value;

                // PSW250 设置
                _settings.AutoConnectPSW250 = chkAutoConnectPSW250.Checked;
                _settings.PSW250ConnectionType = rbPSW250Serial.Checked ? "Serial" : "Ethernet";
                _settings.PSW250ComPort = cmbPSW250ComPort.SelectedItem?.ToString() ?? "";
                _settings.PSW250BaudRate = int.TryParse(cmbPSW250BaudRate.Text, out int br2) ? br2 : 9600;
                _settings.PSW250IpAddress = txtPSW250IpAddress.Text.Trim();
                _settings.PSW250Port = (int)numPSW250Port.Value;

                // Modbus 设置
                _settings.AutoStartModbus = chkAutoStartModbus.Checked;
                _settings.ModbusPort = (int)numModbusPort.Value;
                _settings.ModbusBindIpAddress = GetSelectedBindIpAddress();

                // 启动行为设置
                _settings.StartMinimized = chkStartMinimized.Checked;

                _configService.SaveAppSettings(_settings);

                MessageBox.Show("设置已保存！\n\n自动连接设置将在下次启动程序时生效。", 
                    "保存成功", MessageBoxButtons.OK, MessageBoxIcon.Information);
                
                this.DialogResult = DialogResult.OK;
                this.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show($"保存失败: {ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            this.DialogResult = DialogResult.Cancel;
            this.Close();
        }
    }
}