using System.IO.Compression;
using System.IO;

namespace LumaTunnel.Client.Installer;

internal static class InstallerActions
{
    private static readonly string InstallDirectory = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "Programs", "LumaTunnel");
    private static string Executable => Path.Combine(InstallDirectory, "LumaTunnel.exe");

    public static async Task<string> InstallAsync(bool desktopShortcut)
    {
        var payload = Path.Combine(AppContext.BaseDirectory, "LumaTunnel.Client.zip");
        if (!File.Exists(payload))
            throw new FileNotFoundException("安装负载 LumaTunnel.Client.zip 不存在。", payload);
        Directory.CreateDirectory(InstallDirectory);
        await Task.Run(() => ZipFile.ExtractToDirectory(payload, InstallDirectory, true)).ConfigureAwait(false);
        if (!File.Exists(Executable))
            throw new InvalidDataException("安装负载中缺少 LumaTunnel.exe。");

        var programs = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.StartMenu), "Programs", "LumaTunnel.lnk");
        CreateShortcut(programs, Executable);
        if (desktopShortcut)
            CreateShortcut(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), "LumaTunnel.lnk"), Executable);
        return Executable;
    }

    public static async Task<bool> UninstallAsync()
    {
        try
        {
            DeleteShortcut(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.StartMenu), "Programs", "LumaTunnel.lnk"));
            DeleteShortcut(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), "LumaTunnel.lnk"));
            if (Directory.Exists(InstallDirectory))
                await Task.Run(() => Directory.Delete(InstallDirectory, true)).ConfigureAwait(false);
            return true;
        }
        catch
        {
            return false;
        }
    }

    private static void CreateShortcut(string shortcutPath, string targetPath)
    {
        var type = Type.GetTypeFromProgID("WScript.Shell") ?? throw new PlatformNotSupportedException("Windows Script Host is unavailable.");
        dynamic shell = Activator.CreateInstance(type)!;
        dynamic shortcut = shell.CreateShortcut(shortcutPath);
        shortcut.TargetPath = targetPath;
        shortcut.WorkingDirectory = InstallDirectory;
        shortcut.IconLocation = targetPath + ",0";
        shortcut.Description = "LumaTunnel 光隧";
        shortcut.Save();
        System.Runtime.InteropServices.Marshal.FinalReleaseComObject(shortcut);
        System.Runtime.InteropServices.Marshal.FinalReleaseComObject(shell);
    }

    private static void DeleteShortcut(string path)
    {
        if (File.Exists(path)) File.Delete(path);
    }
}