using Microsoft.AspNetCore.Hosting;
using NexusReader.Application.Abstractions.Services;

namespace NexusReader.Infrastructure.Services;

/// <summary>
/// Infrastructure implementation of general storage utilizing local filesystem.
/// Files are saved in wwwroot/uploads/media.
/// </summary>
public class LocalStorageService : IStorageService
{
    private readonly IWebHostEnvironment _environment;

    public LocalStorageService(IWebHostEnvironment environment)
    {
        _environment = environment;
    }

    public async Task<string> UploadFileAsync(byte[] fileBytes, string fileName, string contentType)
    {
        using var stream = new MemoryStream(fileBytes);
        return await UploadFileAsync(stream, fileName, contentType);
    }

    public async Task<string> UploadFileAsync(Stream fileStream, string fileName, string contentType)
    {
        var mediaFolder = Path.Combine(_environment.WebRootPath, "uploads", "media");
        
        if (!Directory.Exists(mediaFolder))
        {
            Directory.CreateDirectory(mediaFolder);
        }

        // Clean file name to prevent path traversal issues
        var safeFileName = Path.GetFileName(fileName);
        var uniqueFileName = $"{Guid.NewGuid()}_{safeFileName}";
        var filePath = Path.Combine(mediaFolder, uniqueFileName);

        using (var outputStream = new FileStream(filePath, FileMode.Create))
        {
            await fileStream.CopyToAsync(outputStream);
        }

        // Return the public web-relative URL
        return $"/uploads/media/{uniqueFileName}";
    }
}