using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.Json.Serialization;
using System.Threading.Tasks;
using System.Web;
using Furion;
using Furion.RemoteRequest.Extensions;
using UAParser;

namespace GDZZ.Core;

/// <summary>
/// HTTP网络工具
/// </summary>
public static class HttpNewUtil
{
    /// <summary>
    /// 客户端IP地址
    /// </summary>
    public static string Ip
    {
        get
        {
            var result = string.Empty;
            if (App.HttpContext != null)
            {
                result = GetWebClientIp();
            }

            if (string.IsNullOrEmpty(result))
            {
                result = GetLanIp();
            }

            return result;
        }
    }

    /// <summary>
    /// 得到客户端IP地址
    /// </summary>
    /// <returns></returns>
    private static string GetWebClientIp()
    {
        var ip = GetWebRemoteIp();
        foreach (var hostAddress in Dns.GetHostAddresses(ip))
        {
            if (hostAddress.AddressFamily == AddressFamily.InterNetwork)
            {
                return hostAddress.ToString();
            }
        }

        return string.Empty;
    }

    /// <summary>
    /// 得到局域网IP地址
    /// </summary>
    /// <returns></returns>
    public static string GetLanIp()
    {
        foreach (var hostAddress in Dns.GetHostAddresses(Dns.GetHostName()))
        {
            if (hostAddress.AddressFamily == AddressFamily.InterNetwork)
            {
                return hostAddress.ToString();
            }
        }

        return string.Empty;
    }

    /// <summary>
    /// 得到远程Ip地址
    /// </summary>
    /// <returns></returns>
    private static string GetWebRemoteIp()
    {
        if (App.HttpContext?.Connection?.RemoteIpAddress == null)
            return string.Empty;
        var ip = App.HttpContext?.Connection?.RemoteIpAddress.ToString();
        if (App.HttpContext == null)
            return ip;
        if (App.HttpContext.Request.Headers.ContainsKey("X-Real-IP"))
        {
            ip = App.HttpContext.Request.Headers["X-Real-IP"].ToString();
        }

        if (App.HttpContext.Request.Headers.ContainsKey("X-Forwarded-For"))
        {
            ip = App.HttpContext.Request.Headers["X-Forwarded-For"].ToString();
        }

        return ip;
    }

    /// <summary>
    /// 请求UserAgent信息
    /// </summary>
    public static string UserAgent
    {
        get
        {
            string userAgent = App.HttpContext?.Request?.Headers["User-Agent"];

            return userAgent;
        }
    }

    /// <summary>
    /// 请求Url
    /// </summary>
    public static string Url
    {
        get
        {
            var url = new StringBuilder().Append(App.HttpContext?.Request?.Scheme).Append("://")
                .Append(App.HttpContext?.Request?.Host).Append(App.HttpContext?.Request?.PathBase)
                .Append(App.HttpContext?.Request?.Path).Append(App.HttpContext?.Request?.QueryString).ToString();
            return url;
        }
    }

    /// <summary>
    /// 得到操作系统版本
    /// </summary>
    /// <returns></returns>
    public static string GetOSVersion()
    {
        var osVersion = string.Empty;
        var userAgent = UserAgent;
        if (userAgent.Contains("NT 10"))
        {
            osVersion = "Windows 10";
        }
        else if (userAgent.Contains("NT 6.3"))
        {
            osVersion = "Windows 8";
        }
        else if (userAgent.Contains("NT 6.1"))
        {
            osVersion = "Windows 7";
        }
        else if (userAgent.Contains("NT 6.0"))
        {
            osVersion = "Windows Vista/Server 2008";
        }
        else if (userAgent.Contains("NT 5.2"))
        {
            osVersion = "Windows Server 2003";
        }
        else if (userAgent.Contains("NT 5.1"))
        {
            osVersion = "Windows XP";
        }
        else if (userAgent.Contains("NT 5"))
        {
            osVersion = "Windows 2000";
        }
        else if (userAgent.Contains("NT 4"))
        {
            osVersion = "Windows NT4";
        }
        else if (userAgent.Contains("Android"))
        {
            osVersion = "Android";
        }
        else if (userAgent.Contains("Me"))
        {
            osVersion = "Windows Me";
        }
        else if (userAgent.Contains("98"))
        {
            osVersion = "Windows 98";
        }
        else if (userAgent.Contains("95"))
        {
            osVersion = "Windows 95";
        }
        else if (userAgent.Contains("Mac"))
        {
            osVersion = "Mac";
        }
        else if (userAgent.Contains("Unix"))
        {
            osVersion = "UNIX";
        }
        else if (userAgent.Contains("Linux"))
        {
            osVersion = "Linux";
        }
        else if (userAgent.Contains("SunOS"))
        {
            osVersion = "SunOS";
        }

        return osVersion;
    }

    /// <summary>
    /// 公网信息
    /// 慎用，如果不是直接请求接口，而是通过代理转发，拿到的是服务器的公网信息
    /// </summary>
    /// <returns></returns>
    public static async Task<WhoisIPInfoModel> WanInfo()
    {
        const string url = "http://whois.pconline.com.cn/ipJson.jsp";
        var resultStr = await url.GetAsStringAsync();
        resultStr = resultStr[(resultStr.IndexOf("IPCallBack(", StringComparison.Ordinal) + "IPCallBack(".Length)..]
            .TrimEnd();
        resultStr = resultStr[..^3];
        var result = resultStr.ToObject<WhoisIPInfoModel>();
        return result;
    }

    /// <summary>
    /// 根据IP地址获取公网信息
    /// </summary>
    /// <returns></returns>
    public static async Task<WhoisIPInfoModel> WanInfo(string ip)
    {
        var url = $"http://whois.pconline.com.cn/ipJson.jsp?ip={ip}";
        var resultStr = await url.GetAsStringAsync();
        resultStr = resultStr[(resultStr.IndexOf("IPCallBack(", StringComparison.Ordinal) + "IPCallBack(".Length)..]
            .TrimEnd();
        resultStr = resultStr[..^3];
        var result = resultStr.ToObject<WhoisIPInfoModel>();
        return result;
    }

    /// <summary>
    /// UserAgent信息
    /// </summary>
    /// <returns></returns>
    public static UserAgentInfoModel UserAgentInfo()
    {
        var parser = Parser.GetDefault();
        var clientInfo = parser.Parse(UserAgent);
        var result = new UserAgentInfoModel
        {
            PhoneModel = clientInfo.Device.ToString(), OS = clientInfo.OS.ToString(), Browser = clientInfo.UA.ToString()
        };
        return result;
    }

    private static readonly char[] reserveChar = { '/', '?', '*', ':', '|', '\\', '<', '>', '\"' };

    /// <summary>
    /// 远程路径Encode处理,会保证开头是/，结尾也是/
    /// </summary>
    /// <param name="remotePath"></param>
    /// <returns></returns>
    public static string EncodeRemotePath(string remotePath)
    {
        if (remotePath == "/")
        {
            return remotePath;
        }

        var endWith = remotePath.EndsWith("/");
        var part = remotePath.Split('/');
        remotePath = "";
        foreach (var s in part)
        {
            if (s == "")
                continue;
            if (remotePath != "")
            {
                remotePath += "/";
            }

            remotePath += HttpUtility.UrlEncode(s).Replace("+", "%20");
        }

        remotePath = (remotePath.StartsWith("/") ? "" : "/") + remotePath + (endWith ? "/" : "");
        return remotePath;
    }

    /// <summary>
    /// 标准化远程目录路径,会保证开头是/，结尾也是/ ,如果命名不规范，存在保留字符，会返回空字符
    /// </summary>
    /// <param name="remotePath">要标准化的远程路径</param>
    /// <returns></returns>
    public static string StandardizationRemotePath(string remotePath)
    {
        if (string.IsNullOrEmpty(remotePath))
        {
            return "";
        }

        if (!remotePath.StartsWith("/"))
        {
            remotePath = "/" + remotePath;
        }

        if (!remotePath.EndsWith("/"))
        {
            remotePath = remotePath + "/";
        }

        var index1 = 1;
        while (index1 < remotePath.Length)
        {
            var index2 = remotePath.IndexOf('/', index1);
            if (index2 == index1)
            {
                return "";
            }

            var folderName = remotePath.Substring(index1, index2 - index1);
            if (folderName.IndexOfAny(reserveChar) != -1)
            {
                return "";
            }

            index1 = index2 + 1;
        }

        return remotePath;
    }
}

/// <summary>
/// 万网Ip信息Model类
/// </summary>
public class WhoisIPInfoModel
{
    /// <summary>
    /// Ip地址
    /// </summary>
    public string Ip { get; set; }

    /// <summary>
    /// 省份
    /// </summary>
    public string Pro { get; set; }

    /// <summary>
    /// 省份邮政编码
    /// </summary>
    public string ProCode { get; set; }

    /// <summary>
    /// 城市
    /// </summary>
    public string City { get; set; }

    /// <summary>
    /// 城市邮政编码
    /// </summary>
    public string CityCode { get; set; }

    /// <summary>
    /// 地理信息
    /// </summary>
    [JsonPropertyName("addr")]
    public string Address { get; set; }

    /// <summary>
    /// 运营商
    /// </summary>
    public string Operator => Address[(Pro.Length + City.Length)..].Trim();
}

/// <summary>
/// UserAgent 信息Model类
/// </summary>
public class UserAgentInfoModel
{
    /// <summary>
    /// 手机型号
    /// </summary>
    public string PhoneModel { get; set; }

    /// <summary>
    /// 操作系统（版本）
    /// </summary>
    public string OS { get; set; }

    /// <summary>
    /// 浏览器（版本）
    /// </summary>
    public string Browser { get; set; }
}