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using Core.Contexts;
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using Core.Entities;
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using Models.Documents;
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using Serilog;
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using System;
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using System.Collections.Generic;
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using System.IO.Compression;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Web;
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using AutoMapper;
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using Models.Users;
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using Ganss.XSS;
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using Microsoft.EntityFrameworkCore;
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namespace Core.Services.DocumentService
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{
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public class DocumentServiceEF : IDocumentService
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{
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private readonly DatabaseContext databaseContext;
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private readonly ILogger logger;
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private readonly IMapper mapper;
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public DocumentServiceEF(DatabaseContext databaseContext, ILogger logger, IMapper mapper)
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{
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this.databaseContext = databaseContext;
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this.logger = logger;
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this.mapper = mapper;
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}
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/// <summary>
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/// Adds the documents in request to the database
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/// </summary>
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/// <param name="request">request</param>
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/// <param name="userId">GUID of the user</param>
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/// <exception cref="InvalidOperationException">No User with passed GUID</exception>
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/// <exception cref="FormatException">Error decoding BASE64 content</exception>
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/// <exception cref="InvalidDataException">Zip file has wrong format</exception>
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/// <exception cref="IOException">Error reading entries from the zip file</exception>
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public void AddDocuments(DocumentAddRequest request, Guid userId)
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{
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User user = databaseContext.Users.Single(u => u.Id == userId);
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var users = databaseContext.Users.Select(u => u).ToList();
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foreach (var documentInfo in request.Documents)
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{
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if (documentInfo.Format == Models.Enums.EAddDocumentFormat.TEXTFILE)
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{
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// TODO hardcoded UTF-8 - maybe do something smarter
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var documentContent = Encoding.UTF8.GetString(Convert.FromBase64String(documentInfo.Content));
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SaveDocument(documentContent, user, documentInfo.Name, users);
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}
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else if (documentInfo.Format == Models.Enums.EAddDocumentFormat.ZIP)
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{
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var (names, contents) = UnzipDocuments(documentInfo.Content);
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for (int i = 0; i < names.Count; i++)
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{
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SaveDocument(contents[i], user, names[i], users);
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}
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}
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}
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="base64encoded"></param>
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/// <returns></returns>
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private (List<string> Names, List<string> Contents) UnzipDocuments(string base64encoded)
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{
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List<string> names = new();
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List<string> contents = new();
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byte[] decoded = Convert.FromBase64String(base64encoded);
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using (var zipStream = new MemoryStream(decoded))
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using (var zipArchive = new ZipArchive(zipStream))
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{
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foreach (var entry in zipArchive.Entries)
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{
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names.Add(entry.Name);
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using (var streamReader = new StreamReader(entry.Open()))
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{
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string text = streamReader.ReadToEnd();
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contents.Add(text);
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}
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}
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}
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return (names, contents);
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}
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private void SaveDocument(string content, User userAdded, string documentName, List<User> users)
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{
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DocumentContent documentContent = new DocumentContent()
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{
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Content = content
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};
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Document document = new Document()
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{
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DateAdded = DateTime.Now,
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Content = documentContent,
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UserAdded = userAdded,
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Name = documentName,
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Length = documentContent.Content.Length,
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RequiredAnnotations = 3 // TODO this is only for testing purposes
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};
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/*foreach (var user in users)
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{
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Annotation annotation = new Annotation()
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{
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User = user,
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UserAssigned = userAdded,
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State = Models.Enums.EState.NEW,
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DateAssigned = DateTime.Now,
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DateLastChanged = DateTime.Now,
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Document = document,
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Note = ""
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};
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databaseContext.Annotations.Add(annotation);
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}*/
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databaseContext.DocumentContents.Add(documentContent);
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databaseContext.Documents.Add(document);
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databaseContext.SaveChanges(); // Maybe do this after all the documents are added
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}
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public DocumentListResponse GetDocuments(int pageIndex, int pageSize)
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{
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var firstIndex = pageIndex * pageSize;
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var documents = databaseContext.Documents.Select(d => d).ToList();
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var totalCount = documents.Count;
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var pageCount = totalCount / pageSize;
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if (pageCount == 0 && totalCount > 0)
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{
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pageCount = 1;
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}
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if (firstIndex > documents.Count - 1)
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{
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throw new Exception("Page index or page size too large");
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}
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if (firstIndex + pageSize > documents.Count - 1)
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{
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pageSize = documents.Count - firstIndex;
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}
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List<DocumentListInfo> documentInfos = new List<DocumentListInfo>();
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foreach (var document in documents.GetRange(firstIndex, pageSize))
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{
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var annotatingUsers = databaseContext.Annotations.Where(a => a.Document == document).Select(a => a.User).ToList();
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List<UserInfo> annotatingUsersDto = annotatingUsers.Select(a => mapper.Map<UserInfo>(a)).ToList();
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DocumentListInfo dai = mapper.Map<DocumentListInfo>(document);
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dai.AnnotatingUsers = annotatingUsersDto;
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documentInfos.Add(dai);
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}
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return new DocumentListResponse()
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{
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PageCount = pageCount,
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PageIndex = pageIndex,
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TotalCount = totalCount,
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Documents = documentInfos
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};
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}
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public DocumentPreviewResponse GetDocumentPreview(Guid documentId)
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{
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try
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{
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var document = databaseContext.Documents.Include(d => d.Content).Single(d => d.Id == documentId);
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HtmlSanitizer sanitizer = new HtmlSanitizer();
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sanitizer.AllowedAttributes.Clear();
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if (sanitizer.AllowedTags.Contains("img"))
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{
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sanitizer.AllowedTags.Remove("img");
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}
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return new DocumentPreviewResponse()
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{
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Content = sanitizer.Sanitize(document.Content.Content)
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};
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}
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catch (InvalidOperationException e)
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{
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throw new InvalidOperationException("Document not found");
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}
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}
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}
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}
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