First go

will add comments in draft pull request

API/Data/Repositories/EpubFontRepository.cs

@@ -0,0 +1,77 @@
+#nullable enable
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using API.DTOs.Font;
+using API.Entities;
+using AutoMapper;
+using AutoMapper.QueryableExtensions;
+using Microsoft.EntityFrameworkCore;
+
+namespace API.Data.Repositories;
+
+public interface IEpubFontRepository
+{
+    void Add(EpubFont font);
+    void Remove(EpubFont font);
+    void Update(EpubFont font);
+    Task<IEnumerable<EpubFontDto>> GetFontDtos();
+    Task<EpubFontDto?> GetFontDto(int fontId);
+    Task<IEnumerable<EpubFont>> GetFonts();
+    Task<EpubFont?> GetFont(int fontId);
+}
+
+public class EpubFontRepository: IEpubFontRepository
+{
+    private readonly DataContext _context;
+    private readonly IMapper _mapper;
+
+    public EpubFontRepository(DataContext context, IMapper mapper)
+    {
+        _context = context;
+        _mapper = mapper;
+    }
+
+    public void Add(EpubFont font)
+    {
+        _context.Add(font);
+    }
+
+    public void Remove(EpubFont font)
+    {
+        _context.Remove(font);
+    }
+
+    public void Update(EpubFont font)
+    {
+        _context.Entry(font).State = EntityState.Modified;
+    }
+
+    public async Task<IEnumerable<EpubFontDto>> GetFontDtos()
+    {
+        return await _context.EpubFont
+            .ProjectTo<EpubFontDto>(_mapper.ConfigurationProvider)
+            .ToListAsync();
+    }
+
+    public async Task<EpubFontDto?> GetFontDto(int fontId)
+    {
+        return await _context.EpubFont
+            .Where(f => f.Id == fontId)
+            .ProjectTo<EpubFontDto>(_mapper.ConfigurationProvider)
+            .FirstOrDefaultAsync();
+    }
+
+    public async Task<IEnumerable<EpubFont>> GetFonts()
+    {
+        return await _context.EpubFont
+            .ToListAsync();
+    }
+
+    public async Task<EpubFont?> GetFont(int fontId)
+    {
+        return await _context.EpubFont
+            .Where(f => f.Id == fontId)
+            .FirstOrDefaultAsync();
+    }
+}