MetadataFetching:

- Jikan (MAL) linking, fetching/updating

API/Schema/MetadataFetchers/MyAnimeList.cs

@@ -0,0 +1,70 @@
+using System.Text.RegularExpressions;
+using API.Schema.Contexts;
+using JikanDotNet;
+using Microsoft.EntityFrameworkCore;
+
+namespace API.Schema.MetadataFetchers;
+
+public class MyAnimeList : MetadataFetcher
+{
+    private static readonly Jikan Jikan = new ();
+    private static readonly Regex GetIdFromUrl = new(@"https?:\/\/myanimelist\.net\/manga\/([0-9]+)\/?.*");
+    
+    public override MetadataEntry? FindLinkedMetadataEntry(Manga manga)
+    {
+        if (manga.Links.Any(link => link.LinkProvider.Equals("MyAnimeList", StringComparison.InvariantCultureIgnoreCase)))
+        {
+            string url = manga.Links.First(link => link.LinkProvider.Equals("MyAnimeList", StringComparison.InvariantCultureIgnoreCase)).LinkUrl;
+            Match m = GetIdFromUrl.Match(url);
+            if (m.Success && m.Groups[1].Success)
+            {
+                long id = long.Parse(m.Groups[1].Value);
+                return new MetadataEntry(this, manga, id.ToString()!);
+            }
+        }
+
+        ICollection<JikanDotNet.Manga> resultData = Jikan.SearchMangaAsync(manga.Name).Result.Data;
+        if (resultData.Count < 1)
+            return null;
+        return new MetadataEntry(this, manga, resultData.First().MalId.ToString());
+    }
+
+    /// <summary>
+    /// Updates the Manga linked in the MetadataEntry
+    /// </summary>
+    /// <param name="metadataEntry"></param>
+    /// <param name="dbContext"></param>
+    /// <exception cref="FormatException"></exception>
+    /// <exception cref="DbUpdateException"></exception>
+    public override void UpdateMetadata(MetadataEntry metadataEntry, PgsqlContext dbContext)
+    {
+        Manga dbManga = dbContext.Mangas.Find(metadataEntry.MangaId)!;
+        MangaFull resultData;
+        try
+        {
+            long id = long.Parse(metadataEntry.Identifier);
+            resultData = Jikan.GetMangaFullDataAsync(id).Result.Data;
+        }
+        catch (Exception)
+        {
+            throw new FormatException("ID was not in correct format");
+        }
+
+        try
+        {
+            dbManga.Name = resultData.Titles.First().Title;
+            dbManga.Description = resultData.Synopsis;
+            dbManga.AltTitles.Clear();
+            dbManga.AltTitles = resultData.Titles.Select(t => new MangaAltTitle(t.Type, t.Title)).ToList();
+            dbManga.Authors.Clear();
+            dbManga.Authors = resultData.Authors.Select(a => new Author(a.Name)).ToList();
+
+            dbContext.SaveChanges();
+        }
+        catch (DbUpdateException e)
+        {
+            throw;
+        }
+    }
+    
+}