using Store.Management.Framework.Configs;
using System.Diagnostics;
using System.Reflection;
using System.Security;
using System.Security.Principal;

namespace Store.Management.Framework;

/// <summary>当前进程的应用信息；目录与持久化设置分别由 FolderConfig 和设置服务管理。</summary>
public static class Config
{
    public static Guid SessionID { get; } = Guid.NewGuid();

    /// <summary>进程启动时间（本地时间），不受首次访问 Config 的时机影响。</summary>
    public static DateTime AppStartTime { get; } = GetAppStartTime();

    public static string AppName => FolderConfig.AppName;
    public static string AppFullName => AppName;
    public static Version WindowsVersion => Environment.OSVersion.Version;

    /// <summary>优先使用入口程序集文件版本；单文件发布等场景回退到程序集版本。</summary>
    public static Version Version { get; } = GetVersion();

    /// <summary>入口程序集的编译配置，不使用是否附加调试器作为判断依据。</summary>
    public static bool IsRelease { get; } = !string.Equals(
        EntryAssembly.GetCustomAttribute<AssemblyConfigurationAttribute>()?.Configuration,
        "Debug", StringComparison.OrdinalIgnoreCase);

    public static bool IsAdministrator
    {
        get
        {
            if (!OperatingSystem.IsWindows()) return false;
            try
            {
                using WindowsIdentity identity = WindowsIdentity.GetCurrent();
                return new WindowsPrincipal(identity).IsInRole(WindowsBuiltInRole.Administrator);
            }
            catch (SecurityException) { return false; }
            catch (UnauthorizedAccessException) { return false; }
        }
    }

    private static Assembly EntryAssembly => Assembly.GetEntryAssembly() ?? typeof(Config).Assembly;

    public static string GetFullVersionString() =>
        $"{Version} - {(IsRelease ? "Release" : "Debug")}{(IsAdministrator ? " - 管理员" : string.Empty)}";

    private static Version GetVersion()
    {
        string? fileVersion = EntryAssembly.GetCustomAttribute<AssemblyFileVersionAttribute>()?.Version;
        return System.Version.TryParse(fileVersion, out Version? version)
            ? version : EntryAssembly.GetName().Version ?? new Version(0, 0, 0, 0);
    }

    private static DateTime GetAppStartTime()
    {
        using Process process = Process.GetCurrentProcess();
        return process.StartTime;
    }
}