using DataProviders;
using DataProviders.Buckets;
using DomainResults.Common;
using Microsoft.AspNetCore.Mvc;

namespace WeatherForecast.Services {

  /// <summary>
  /// 
  /// </summary>
  public interface IFilesService {

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="userId"></param>
    /// <param name="files"></param>
    /// <returns></returns>
    (List<Guid>?, IDomainResult) Post(Guid siteId, Guid userId, List<IFormFile> files);

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="userId"></param>
    /// <returns></returns>
    IDomainResult Delete(Guid siteId, Guid userId);
  }

  /// <summary>
  /// 
  /// </summary>
  public class FilesService : IFilesService {

    private readonly ILogger<FilesService> _logger;
    private readonly IImagesBucketDataProvider _imageBucketDataProvider;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="logger"></param>
    /// <param name="imageBucketDataProvider"></param>
    public FilesService(
      ILogger<FilesService> logger,
      IImagesBucketDataProvider imageBucketDataProvider
    ) {
      _logger = logger;
      _imageBucketDataProvider = imageBucketDataProvider;
    }

    /// <summary>
    /// Process uploaded files
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="userId"></param>
    /// <param name="files"></param>
    /// <returns></returns>
    public (List<Guid>?, IDomainResult) Post(Guid siteId, Guid userId, List<IFormFile> files) {
      try {
        // Don't rely on or trust the FileName property without validation.

        var newFiles = new List<BucketFile>();
        foreach (var formFile in files) {
          if (formFile.Length > 0) {
            using var ms = new MemoryStream();
            formFile.CopyTo(ms);

            newFiles.Add(new BucketFile(formFile.FileName, ms.ToArray(), formFile.ContentType));
          }
        }

        var (list, result) = _imageBucketDataProvider.UploadMany(siteId, userId, newFiles);

        if (!result.IsSuccess || list == null)
          return IDomainResult.Failed<List<Guid>?>();

        return IDomainResult.Success(list);
      }
      catch (Exception ex) {
        return IDomainResult.Failed<List<Guid>?> (ex.Message);
      }
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="userId"></param>
    /// <returns></returns>
    public IDomainResult Delete(Guid siteId, Guid userId) {
      try {
        return _imageBucketDataProvider.DeletMany(siteId, userId);
      }
      catch (Exception ex) {
        return IDomainResult.Failed(ex.Message);
      }
    }
  }
}