using AutoUpdaterDotNET;
using Microsoft.Extensions.Configuration;
using System.IO;
using System.Net.Http;
using System.Reflection;
using System.Xml;

namespace YY.Admin.Services.Service.AutoUpdate
{
    public class AutoUpdateService : IAutoUpdateService
    {
        private readonly IConfiguration _configuration;

        private readonly HttpClient _httpClient;
        public AutoUpdateService(IConfiguration configuration, HttpClient httpClient)
        {
            _configuration = configuration;
            _httpClient = httpClient;
        }
        /// <summary>
        /// 获取当前程序版本
        /// </summary>
        /// <returns></returns>
        public string GetCurrentVersion()
        {
            try
            {
                var assembly = Assembly.GetEntryAssembly() ?? Assembly.GetExecutingAssembly();
                var version = assembly.GetName().Version;
                return version?.ToString() ?? "1.0.0.0";
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"获取当前版本失败: {ex.Message}");
                return "1.0.0.0";
            }
        }
        /// <summary>
        /// 获取程序版本信息（包含版本号、产品名称等）
        /// </summary>
        /// <returns></returns>
        public VersionInfo GetApplicationInfo()
        {
            try
            {
                var assembly = Assembly.GetEntryAssembly() ?? Assembly.GetExecutingAssembly();
                var version = assembly.GetName().Version;
                var title = assembly.GetCustomAttribute<AssemblyTitleAttribute>()?.Title;
                var product = assembly.GetCustomAttribute<AssemblyProductAttribute>()?.Product;
                var company = assembly.GetCustomAttribute<AssemblyCompanyAttribute>()?.Company;

                return new VersionInfo
                {
                    CurrentVersion = version?.ToString() ?? "1.0.0.0",
                    ApplicationName = title ?? product ?? "应用程序",
                    CompanyName = company ?? "",
                    PublishDate = File.GetLastWriteTime(assembly.Location).ToString("yyyy-MM-dd")
                };
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"获取应用程序信息失败: {ex.Message}");
                return new VersionInfo
                {
                    CurrentVersion = "1.0.0.0",
                    ApplicationName = "应用程序",
                    CompanyName = "",
                    PublishDate = DateTime.Now.ToString("yyyy-MM-dd")
                };
            }
        }
        public async Task<bool> CheckForUpdatesAsync()
        {
            try
            {
                VersionInfo? versionInfo = await ReadRemoteVersionInfoAsync();

                if (versionInfo == null) return false;

                var currentVersion = new Version(GetCurrentVersion());
                var latestVersion = new Version(versionInfo.LatestVersion);

                return latestVersion > currentVersion;
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"自动更新检查失败: {ex.Message}");
                return false;
            }
        }


        public async Task<VersionInfo?> GetVersionInfo()
        {
            try
            {
                VersionInfo? versionInfo = await ReadRemoteVersionInfoAsync();
                if (versionInfo == null) return null;

                versionInfo.CurrentVersion = versionInfo.CurrentVersion;
                 versionInfo.ApplicationName = versionInfo.ApplicationName;

                return versionInfo;
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"获取版本信息失败: {ex.Message}");
                return null;
            }
        }

        private async Task<VersionInfo?> ReadRemoteVersionInfoAsync()
        {
            try
            {
                // 从配置文件读取远程更新地址
                string remoteConfigUrl = _configuration.GetSection("AutoUpdate:RemoteConfigUrl").Value!;

                var xmlContent = await _httpClient.GetStringAsync(remoteConfigUrl);
                return ParseVersionXml(xmlContent);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"读取远程版本信息失败: {ex.Message}");
                return null;
            }
        }

        private VersionInfo? ParseVersionXml(string xmlContent)
        {
            try
            {
                var xmlDoc = new XmlDocument();
                xmlDoc.LoadXml(xmlContent);

                var item = xmlDoc.SelectSingleNode("item");
                if (item != null)
                {
                    return new VersionInfo
                    {
                        LatestVersion = item.SelectSingleNode("version")?.InnerText ?? "1.0.0",
                        DownloadUrl = item.SelectSingleNode("url")?.InnerText ?? "",
                        Changelog = item.SelectSingleNode("changelog")?.InnerText ?? "暂无更新内容",
                        PublishDate = item.SelectSingleNode("publishDate")?.InnerText ?? DateTime.Now.ToString("yyyy-MM-dd"),
                        Mandatory = bool.TryParse(item.SelectSingleNode("mandatory")?.InnerText, out var mandatory) && mandatory
                    };
                }
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"解析版本XML失败: {ex.Message}");
            }

            return null;
        }


        public void StartUpdate(string downloadUrl)
        {
            try
            {
                // 设置更新完成后的回调
                AutoUpdater.ApplicationExitEvent += () =>
                {
                    // 更新完成后可以执行一些清理操作
                    System.Diagnostics.Debug.WriteLine("应用程序准备退出以完成更新");
                };

                AutoUpdater.Start(downloadUrl);
            }
            catch (Exception ex)
            {
                throw new Exception($"更新启动失败: {ex.Message}");
            }
        }

        // 检查是否需要强制更新
        public bool IsMandatoryUpdate(VersionInfo versionInfo)
        {
            if (versionInfo == null) return false;

            var currentVersion = new Version(GetCurrentVersion());
            var latestVersion = new Version(versionInfo.LatestVersion);

            return versionInfo.Mandatory && latestVersion > currentVersion;
        }

    }
   
}