using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using Kreta.Resources;
using Kreta.Web.Configuration;
using Kreta.Web.Helpers.Error;

namespace Kreta.Web.Classes
{
    public class UploadFileValidator : IUploadFileValidator
    {
        public IUploadFileValidationConfiguration Configuration { get; }

        public UploadFileValidator(IUploadFileValidationConfiguration configuration)
        {
            Configuration = configuration;
        }

        public void ValidateImportFile(HttpPostedFileBase importFile)
        {
            ValidateFile(importFile, Configuration.ImportMaxAllowedFileSizeInBytes, Configuration.ImportAllowedFileExtensions);
        }

        public void ValidateAscImportFile(HttpPostedFileBase importFile)
        {
            ValidateFile(importFile, Configuration.ImportMaxAllowedFileSizeInBytes, Configuration.AscImportAllowedFileExtensions);
        }

        public void ValidateFile(HttpPostedFileBase file, int maxAllowedFileSizeInBytes, IEnumerable<string> allowedFileExtensions)
        {
            if (file.ContentLength > maxAllowedFileSizeInBytes)
            {
                throw new StatusError(HttpStatusCode.BadRequest, string.Format(CommonResource.TulNagyFajl, Math.Round((decimal)maxAllowedFileSizeInBytes / 1024 / 1024)));
            }

            if (!allowedFileExtensions.Contains(Path.GetExtension(file.FileName).ToLower()))
            {
                throw new StatusError(HttpStatusCode.BadRequest, string.Format(CommonResource.NemMegfeleloFajlKiterjesztes, string.Join(", ", allowedFileExtensions)));
            }
        }
    }
}