using Duempelkas.App.Services.Models;
using System.Diagnostics;
using System.Runtime.InteropServices;
using Duempelkas.App.Services;

namespace Duempelkas.Infrastructure.Services;

public class FileSaveService(IFileDialogService dialogs) : IFileSaveService
{
    public async Task<FileOperationResult> SaveFileAsync(byte[] content, string suggestedFileName)
    {
        string? staged = null;
        try
        {
            var path = await dialogs.SaveAsync(suggestedFileName);
            if (string.IsNullOrWhiteSpace(path)) return FileOperationResult.Cancelled();
            staged = path + $".{Guid.NewGuid():N}.tmp";
            await File.WriteAllBytesAsync(staged, content);
            File.Move(staged, path, overwrite: true);
            return new(FileOperationStatus.Success, "Datei gespeichert.", path);
        }
        catch (Exception ex) { return FileOperationResult.Error(ex); }
        finally { try { if (staged != null && File.Exists(staged)) File.Delete(staged); } catch { } }
    }

    public Task<FileOperationResult> OpenFileAsync(string filePath) => OpenAsync(filePath, false);
    public Task<FileOperationResult> OpenFolderAsync(string filePath) => OpenAsync(filePath, true);

    private static Task<FileOperationResult> OpenAsync(string filePath, bool folder) => Task.Run(() =>
    {
        try
        {
            var path = folder ? Path.GetDirectoryName(Path.GetFullPath(filePath))! : filePath;
            if (folder ? !Directory.Exists(path) : !File.Exists(path))
                throw new FileNotFoundException("Der gespeicherte Pfad ist nicht mehr vorhanden.");
            var start = new ProcessStartInfo { UseShellExecute = true };
            if (OperatingSystem.IsWindows()) start.FileName = path;
            else { start.FileName = OperatingSystem.IsMacOS() ? "open" : "xdg-open"; start.ArgumentList.Add(path); }
            using var process = Process.Start(start) ?? throw new IOException("Kein Programm zum Öffnen gefunden.");
            return new FileOperationResult(FileOperationStatus.Success, folder ? "Ordner geöffnet." : "Datei geöffnet.");
        }
        catch (Exception ex)
        {
            return new FileOperationResult(FileOperationStatus.Error,
                "Der Pfad konnte nicht geöffnet werden. Die gespeicherte Datei bleibt erhalten; bitte den Speicherort im Datei-Explorer öffnen.", filePath, ex.Message);
        }
    });

}