DD.WellWorkover.Cloud/AsbCloudInfrastructure/Services/FileService.cs

using System;
using System.Linq;
using System.Collections.Generic;
using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudDb.Model;

namespace AsbCloudInfrastructure.Services
{
    public class FileService : IFileService
    {
        public string RootPath { get; private set; }
        private readonly IAsbCloudDbContext db;

        public FileService(IAsbCloudDbContext db)
        {
            RootPath = "files";
            this.db = db;
        }

        public IDictionary<string, int> SaveFilesPropertiesToDb(int wellId, int idCategory, 
            IEnumerable<(string fileName, int idCategory, DateTime date, int idUser)> filesInfo)
        {
            var fileIdsToNames = new Dictionary<string, int>();

           foreach(var fileInfo in filesInfo)
           {
                var file = new File()
                {
                    Name = fileInfo.fileName,
                    IdCategory = fileInfo.idCategory,
                    Date = fileInfo.date,
                    IdUser = fileInfo.idUser
                };

                db.Files.Add(file);
                db.SaveChanges();
                fileIdsToNames.Add(file.Name, file.Id);
            }

            return fileIdsToNames;
        }

        public IEnumerable<FilePropertiesDto> GetFilesInfo(int wellId, int idCategory)
        {
            var fileInfoFromDb = db.Files.Where(f => f.IdWell == wellId && 
                f.IdCategory == idCategory).Select(file => new FilePropertiesDto
                {
                    Id = file.Id,
                    Name = file.Name,
                    IdCategory = file.IdCategory,
                    UploadDate = file.Date,
                    UserName = file.IdUser.ToString()
                }).ToList();        

            return fileInfoFromDb;
        }

        public (int Id, string Name, int IdCategory)? GetFileInfo(int fileId)
        {
            var fileInfo = db.Files.FirstOrDefault(f => f.Id == fileId);

            if (fileInfo is null)
                return null;

            return (fileInfo.Id, fileInfo.Name, fileInfo.IdCategory);
        }
    }
}