using System.Net;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Cors;
using Microsoft.AspNetCore.Mvc;
using Peripherals.NetConfigClient;

namespace server.Controllers;

/// <summary>
/// 网络配置控制器（仅管理员权限）
/// </summary>
[ApiController]
[Route("api/[controller]")]
[Authorize("Admin")]
public class NetConfigController : ControllerBase
{
    private static readonly NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();

    // 固定的实验板IP和端口
    private const string BOARD_IP = "169.254.109.0";
    private const int BOARD_PORT = 1234;

    /// <summary>
    /// 获取主机IP地址
    /// </summary>
    /// <returns>主机IP地址</returns>
    [HttpGet("GetHostIP")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(string), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> GetHostIP()
    {
        try
        {
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.GetHostIP();

            if (!result.IsSuccessful)
            {
                logger.Error($"获取主机IP失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"获取失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "获取主机IP时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "获取失败，请稍后重试");
        }
    }

    /// <summary>
    /// 获取板卡IP地址
    /// </summary>
    /// <returns>板卡IP地址</returns>
    [HttpGet("GetBoardIP")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(string), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> GetBoardIP()
    {
        try
        {
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.GetBoardIP();

            if (!result.IsSuccessful)
            {
                logger.Error($"获取板卡IP失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"获取失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "获取板卡IP时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "获取失败，请稍后重试");
        }
    }

    /// <summary>
    /// 获取主机MAC地址
    /// </summary>
    /// <returns>主机MAC地址</returns>
    [HttpGet("GetHostMAC")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(string), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> GetHostMAC()
    {
        try
        {
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.GetHostMAC();

            if (!result.IsSuccessful)
            {
                logger.Error($"获取主机MAC地址失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"获取失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "获取主机MAC地址时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "获取失败，请稍后重试");
        }
    }

    /// <summary>
    /// 获取板卡MAC地址
    /// </summary>
    /// <returns>板卡MAC地址</returns>
    [HttpGet("GetBoardMAC")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(string), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> GetBoardMAC()
    {
        try
        {
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.GetBoardMAC();

            if (!result.IsSuccessful)
            {
                logger.Error($"获取板卡MAC地址失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"获取失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "获取板卡MAC地址时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "获取失败，请稍后重试");
        }
    }

    /// <summary>
    /// 获取所有网络配置信息
    /// </summary>
    /// <returns>网络配置信息</returns>
    [HttpGet("GetNetworkConfig")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(NetworkConfigDto), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> GetNetworkConfig()
    {
        try
        {
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            
            var hostIPResult = await netConfig.GetHostIP();
            var boardIPResult = await netConfig.GetBoardIP();
            var hostMACResult = await netConfig.GetHostMAC();
            var boardMACResult = await netConfig.GetBoardMAC();

            var config = new NetworkConfigDto
            {
                HostIP = hostIPResult.IsSuccessful ? hostIPResult.Value : "获取失败",
                BoardIP = boardIPResult.IsSuccessful ? boardIPResult.Value : "获取失败",
                HostMAC = hostMACResult.IsSuccessful ? hostMACResult.Value : "获取失败",
                BoardMAC = boardMACResult.IsSuccessful ? boardMACResult.Value : "获取失败"
            };

            return Ok(config);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "获取网络配置信息时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "获取失败，请稍后重试");
        }
    }

    /// <summary>
    /// 获取本机所有网络接口信息
    /// </summary>
    /// <returns>网络接口信息列表</returns>
    [HttpGet("GetLocalNetworkInterfaces")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(List<NetworkInterfaceDto>), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public IActionResult GetLocalNetworkInterfaces()
    {
        try
        {
            var interfaces = System.Net.NetworkInformation.NetworkInterface
                .GetAllNetworkInterfaces()
                .Where(nic => nic.OperationalStatus == System.Net.NetworkInformation.OperationalStatus.Up
                              && nic.NetworkInterfaceType != System.Net.NetworkInformation.NetworkInterfaceType.Loopback)
                .Select(nic => new NetworkInterfaceDto
                {
                    Name = nic.Name,
                    Description = nic.Description,
                    Type = nic.NetworkInterfaceType.ToString(),
                    Status = nic.OperationalStatus.ToString(),
                    IPAddresses = nic.GetIPProperties().UnicastAddresses
                        .Where(addr => addr.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                        .Select(addr => addr.Address.ToString())
                        .ToList(),
                    MACAddress = nic.GetPhysicalAddress().ToString()
                })
                .ToList();

            return Ok(interfaces);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "获取本机网络接口信息时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "获取失败，请稍后重试");
        }
    }

    /// <summary>
    /// 设置主机IP地址
    /// </summary>
    /// <param name="hostIp">主机IP地址</param>
    /// <returns>操作结果</returns>
    [HttpPost("SetHostIP")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(bool), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> SetHostIP(string hostIp)
    {
        if (string.IsNullOrWhiteSpace(hostIp))
            return BadRequest("主机IP地址不能为空");

        if (!IPAddress.TryParse(hostIp, out var hostIpAddress))
            return BadRequest("主机IP地址格式不正确");

        try
        {
            // 创建网络配置客户端
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.SetHostIP(hostIpAddress);

            if (!result.IsSuccessful)
            {
                logger.Error($"设置主机IP失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"设置失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "设置主机IP时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "设置失败，请稍后重试");
        }
    }

    /// <summary>
    /// 设置板卡IP地址
    /// </summary>
    /// <param name="newBoardIp">新的板卡IP地址</param>
    /// <returns>操作结果</returns>
    [HttpPost("SetBoardIP")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(bool), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> SetBoardIP(string newBoardIp)
    {
        if (string.IsNullOrWhiteSpace(newBoardIp))
            return BadRequest("新的板卡IP地址不能为空");

        if (!IPAddress.TryParse(newBoardIp, out var newIpAddress))
            return BadRequest("新的板卡IP地址格式不正确");

        try
        {
            // 创建网络配置客户端
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.SetBoardIP(newIpAddress);

            if (!result.IsSuccessful)
            {
                logger.Error($"设置板卡IP失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"设置失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "设置板卡IP时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "设置失败，请稍后重试");
        }
    }

    /// <summary>
    /// 设置主机MAC地址
    /// </summary>
    /// <param name="hostMac">主机MAC地址（格式：AA:BB:CC:DD:EE:FF）</param>
    /// <returns>操作结果</returns>
    [HttpPost("SetHostMAC")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(bool), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> SetHostMAC(string hostMac)
    {
        if (string.IsNullOrWhiteSpace(hostMac))
            return BadRequest("主机MAC地址不能为空");

        // 解析MAC地址
        if (!TryParseMacAddress(hostMac, out var macBytes))
            return BadRequest("MAC地址格式不正确，请使用格式：AA:BB:CC:DD:EE:FF");

        try
        {
            // 创建网络配置客户端
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.SetHostMAC(macBytes);

            if (!result.IsSuccessful)
            {
                logger.Error($"设置主机MAC地址失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"设置失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "设置主机MAC地址时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "设置失败，请稍后重试");
        }
    }

    /// <summary>
    /// 自动获取本机IP地址并设置为实验板主机IP
    /// </summary>
    /// <returns>操作结果</returns>
    [HttpPost("UpdateHostIP")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(bool), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> UpdateHostIP()
    {
        try
        {
            // 获取本机第一个有效的IPv4地址
            var ip = System.Net.NetworkInformation.NetworkInterface
                .GetAllNetworkInterfaces()
                .Where(nic => nic.OperationalStatus == System.Net.NetworkInformation.OperationalStatus.Up
                              && nic.NetworkInterfaceType != System.Net.NetworkInformation.NetworkInterfaceType.Loopback)
                .SelectMany(nic => nic.GetIPProperties().UnicastAddresses)
                .Where(addr => addr.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                .Select(addr => addr.Address)
                .FirstOrDefault();

            if (ip == null)
                return StatusCode(StatusCodes.Status500InternalServerError, "无法获取本机IP地址");

            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.SetHostIP(ip);

            if (!result.IsSuccessful)
            {
                logger.Error($"自动设置主机IP失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"设置失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "自动设置主机IP时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "设置失败，请稍后重试");
        }
    }

    /// <summary>
    /// 更新主机MAC地址
    /// </summary>
    /// <returns>操作结果</returns>
    [HttpPost("UpdateHostMAC")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(bool), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> UpdateHostMAC()
    {
        byte[]? macBytes = null;
        try
        {
            // 获取本机第一个可用的MAC地址
            macBytes = System.Net.NetworkInformation.NetworkInterface
                .GetAllNetworkInterfaces()
                .Where(nic => nic.OperationalStatus == System.Net.NetworkInformation.OperationalStatus.Up
                              && nic.NetworkInterfaceType != System.Net.NetworkInformation.NetworkInterfaceType.Loopback)
                .Select(nic => nic.GetPhysicalAddress()?.GetAddressBytes())
                .FirstOrDefault(bytes => bytes != null && bytes.Length == 6);

            if (macBytes == null)
                return StatusCode(StatusCodes.Status500InternalServerError, "无法获取本机MAC地址");

            // 创建网络配置客户端
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.SetHostMAC(macBytes);

            if (!result.IsSuccessful)
            {
                logger.Error($"设置主机MAC地址失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"设置失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "设置主机MAC地址时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "设置失败，请稍后重试");
        }
    }

    /// <summary>
    /// 设置板卡MAC地址
    /// </summary>
    /// <param name="boardMac">板卡MAC地址（格式：AA:BB:CC:DD:EE:FF）</param>
    /// <returns>操作结果</returns>
    [HttpPost("SetBoardMAC")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(bool), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> SetBoardMAC(string boardMac)
    {
        if (string.IsNullOrWhiteSpace(boardMac))
            return BadRequest("板卡MAC地址不能为空");

        // 解析MAC地址
        if (!TryParseMacAddress(boardMac, out var macBytes))
            return BadRequest("MAC地址格式不正确，请使用格式：AA:BB:CC:DD:EE:FF");

        try
        {
            // 创建网络配置客户端
            var netConfig = new NetConfig(BOARD_IP, BOARD_PORT, 0);
            var result = await netConfig.SetBoardMAC(macBytes);

            if (!result.IsSuccessful)
            {
                logger.Error($"设置板卡MAC地址失败: {result.Error}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"设置失败: {result.Error}");
            }

            return Ok(result.Value);
        }
        catch (Exception ex)
        {
            logger.Error(ex, "设置板卡MAC地址时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError, "设置失败，请稍后重试");
        }
    }

    /// <summary>
    /// 解析MAC地址字符串为字节数组
    /// </summary>
    /// <param name="macAddress">MAC地址字符串</param>
    /// <param name="macBytes">解析后的字节数组</param>
    /// <returns>是否解析成功</returns>
    private static bool TryParseMacAddress(string macAddress, out byte[] macBytes)
    {
        macBytes = Array.Empty<byte>();

        if (string.IsNullOrWhiteSpace(macAddress))
            return false;

        // 移除可能的分隔符并统一为冒号
        var cleanMac = macAddress.Replace("-", ":").Replace(" ", "").ToUpper();

        // 验证格式
        if (cleanMac.Length != 17 || cleanMac.Count(c => c == ':') != 5)
            return false;

        var parts = cleanMac.Split(':');
        if (parts.Length != 6)
            return false;

        try
        {
            macBytes = new byte[6];
            for (int i = 0; i < 6; i++)
            {
                macBytes[i] = Convert.ToByte(parts[i], 16);
            }
            return true;
        }
        catch
        {
            macBytes = Array.Empty<byte>();
            return false;
        }
    }
}

/// <summary>
/// 网络配置数据传输对象
/// </summary>
public class NetworkConfigDto
{
    /// <summary>
    /// 主机IP地址
    /// </summary>
    public string? HostIP { get; set; }

    /// <summary>
    /// 板卡IP地址
    /// </summary>
    public string? BoardIP { get; set; }

    /// <summary>
    /// 主机MAC地址
    /// </summary>
    public string? HostMAC { get; set; }

    /// <summary>
    /// 板卡MAC地址
    /// </summary>
    public string? BoardMAC { get; set; }
}

/// <summary>
/// 网络配置操作结果
/// </summary>
public class NetworkConfigResult
{
    /// <summary>
    /// 主机IP设置结果
    /// </summary>
    public bool? HostIPResult { get; set; }

    /// <summary>
    /// 主机IP设置错误信息
    /// </summary>
    public string? HostIPError { get; set; }

    /// <summary>
    /// 板卡IP设置结果
    /// </summary>
    public bool? BoardIPResult { get; set; }

    /// <summary>
    /// 板卡IP设置错误信息
    /// </summary>
    public string? BoardIPError { get; set; }

    /// <summary>
    /// 主机MAC设置结果
    /// </summary>
    public bool? HostMACResult { get; set; }

    /// <summary>
    /// 主机MAC设置错误信息
    /// </summary>
    public string? HostMACError { get; set; }

    /// <summary>
    /// 板卡MAC设置结果
    /// </summary>
    public bool? BoardMACResult { get; set; }

    /// <summary>
    /// 板卡MAC设置错误信息
    /// </summary>
    public string? BoardMACError { get; set; }
}

/// <summary>
/// 网络接口信息数据传输对象
/// </summary>
public class NetworkInterfaceDto
{
    /// <summary>
    /// 网络接口名称
    /// </summary>
    public string Name { get; set; } = string.Empty;

    /// <summary>
    /// 网络接口描述
    /// </summary>
    public string Description { get; set; } = string.Empty;

    /// <summary>
    /// 网络接口类型
    /// </summary>
    public string Type { get; set; } = string.Empty;

    /// <summary>
    /// 网络接口状态
    /// </summary>
    public string Status { get; set; } = string.Empty;

    /// <summary>
    /// IP地址列表
    /// </summary>
    public List<string> IPAddresses { get; set; } = new();

    /// <summary>
    /// MAC地址
    /// </summary>
    public string MACAddress { get; set; } = string.Empty;
}