.

VizhTalk.Learning.Domain/Entities/Course.cs

@@ -1,12 +1,30 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using VizhTalk.BuildingBlocks.Domain;
+using VizhTalk.Learning.Domain.TypeIds;
+using VizhTalk.Learning.Domain.ValueObjects;
 
-namespace VizhTalk.Learning.Domain.Entities
+namespace VizhTalk.Learning.Domain.Entities;
+
+public class Course : Entity<CourseId>
 {
-    internal class Course
+    private Course()
     {
+
     }
+    private Course(CourseTitle title, int order)
+    {
+        Title = title;
+        Order = order;
+    }
+    public CourseTitle Title { get; private set; }
+    public Media Image { get; private set; }
+    public int Order { get; private set; }
+
+    internal static Course CreateNew(CourseTitle title, int order)
+        => new(title, order);
+    public void SetTitle(CourseTitle title)
+        => Title = title;
+    public void SetOrder(int order)
+        => Order = order;
+    public void SetImage(Media media)
+        => Image = media;
 }

VizhTalk.Learning.Domain/Entities/Language.cs

@@ -1,4 +1,5 @@
 using VizhTalk.BuildingBlocks.Domain;
+using VizhTalk.Learning.Domain.Exceptions;
 using VizhTalk.Learning.Domain.TypeIds;
 using VizhTalk.Learning.Domain.ValueObjects;
 
@@ -6,24 +7,40 @@ namespace VizhTalk.Learning.Domain.Entities;
 
 public class Language : Entity<LanguageId>, IAggregateRoot
 {
-    public Language()
+    private List<Course> _courses = new();
+    private Language()
     {
         // only EF
     }
-    private Language(LanguageTitle title, Media icon)
+    private Language(LanguageTitle title)
     {
         Title = title;
-        Icon = icon;
-
     }
     public LanguageTitle Title { get; private set; }
     public Media Icon { get; private set; }
+    public IReadOnlyList<Course> Courses => _courses;
+    public static Language CreateNew(LanguageTitle title)
+        => new(title);
 
-    public static Language CreateNew(LanguageTitle title,Media icon)
-        => new(title, icon);
-    
     public void SetTitle(LanguageTitle title)
         => Title = title;
     public void SetIcon(Media icon)
-        => Icon = icon;
+    {
+        if (Icon != null)
+            Icon.SetDeleted(true);
+
+        Icon = icon;
+    }
+    public Course AddCourse(CourseTitle courseTitle)
+    {
+        var order = Courses.Count;
+        var course = Course.CreateNew(courseTitle, order);
+        _courses.Add(course);
+        return course;
+    }
+    public Course UpdateCourse(Course course)
+    {
+        var _course = _courses.FirstOrDefault(x => x.Id == course.Id) ?? throw new CourseNotFoundException(Title);
+        throw new Exception();
+    }
 }

VizhTalk.Learning.Domain/Entities/Media.cs

@@ -6,9 +6,28 @@ namespace VizhTalk.Learning.Domain.Entities;
 
 public class Media : Entity<MediaId>
 {
+    private Media()
+    {
+        
+    }
+    private Media(string name,
+        string contentType,
+        int size,
+        EntityType type)
+    {
+        Name = name;
+        ContentType = contentType;
+        Size = size;
+        EntityType = type;
+    }
     public string Name { get; private set; }
     public string ContentType { get;  private set; }
     public int Size { get; private set; }
     public EntityType EntityType { get; private set; }
 
+    public static Media CreateNew(string name,
+        string contentType,
+        int size,
+        EntityType type)
+        => new(name, contentType, size, type);
 }

VizhTalk.Learning.Domain/Exceptions/CourseNotFoundException.cs

@@ -0,0 +1,8 @@
+using VizhTalk.BuildingBlocks.Domain.Contract;
+
+namespace VizhTalk.Learning.Domain.Exceptions;
+
+public class CourseNotFoundException(string languageTitle) 
+    : Exception($"course not found in {languageTitle} language"),IGuardException
+{
+}

VizhTalk.Learning.Domain/Repositories/IFileGroupRepository.cs

@@ -0,0 +1,11 @@
+using VizhTalk.BuildingBlocks.Domain;
+using VizhTalk.Learning.Domain.Entities;
+using VizhTalk.Learning.Domain.TypeIds;
+using VizhTalk.Learning.Domain.ValueObjects;
+
+namespace VizhTalk.Learning.Domain.Repositories;
+
+public interface IFileGroupRepository : IRepositoryBase<FileGroup,FileGroupId>
+{
+    Task<FileGroup> GetByFileGroupKey(FileGroupKey key, CancellationToken cancellationToken = default);
+}

VizhTalk.Learning.Domain/Repositories/ILanguageRepository.cs

@@ -2,10 +2,9 @@
 using VizhTalk.Learning.Domain.Entities;
 using VizhTalk.Learning.Domain.TypeIds;
 
-namespace VizhTalk.Learning.Domain.Repositories
-{
-    public interface ILanguageRepository : IRepositoryBase<Language,LanguageId>
-    {
+namespace VizhTalk.Learning.Domain.Repositories;
+
+public interface ILanguageRepository : IRepositoryBase<Language,LanguageId>
+{
 
-    }
 }

VizhTalk.Learning.Domain/Repositories/IMediaRepository.cs

@@ -0,0 +1,9 @@
+using VizhTalk.BuildingBlocks.Domain;
+using VizhTalk.Learning.Domain.Entities;
+using VizhTalk.Learning.Domain.TypeIds;
+
+namespace VizhTalk.Learning.Domain.Repositories;
+
+public interface IMediaRepository : IRepositoryBase<Media,MediaId>
+{
+}

VizhTalk.Learning.Domain/TypeIds/CourseId.cs

@@ -0,0 +1,10 @@
+using VizhTalk.BuildingBlocks.Domain;
+
+namespace VizhTalk.Learning.Domain.TypeIds;
+
+public class CourseId : TypeIdValueBase<long>
+{
+    public CourseId(long value) : base(value)
+    {
+    }
+}

VizhTalk.Learning.Domain/ValueObjects/CourseTitle.cs

@@ -0,0 +1,18 @@
+using VizhTalk.BuildingBlocks.Domain.Guards;
+
+namespace VizhTalk.Learning.Domain.ValueObjects;
+
+public  class CourseTitle
+{
+    public CourseTitle(string title)
+    {
+        title = title.Trim();
+        Guard.NullOrEmpty(title, nameof(LanguageTitle));
+        Guard.MaxLength(title, nameof(LanguageTitle), 60);
+        Value = title;
+    }
+    public string Value { get; private set; }
+
+    public static implicit operator string(CourseTitle title) => title.Value;
+
+}

VizhTalk.Learning.Domain/ValueObjects/FileGroupKey.cs

@@ -10,7 +10,7 @@ namespace VizhTalk.Learning.Domain.ValueObjects
 {
     public class FileGroupKey : ValueObject
     {
-        public static FileGroupKey LanguageIcon = new("Language");
+        public static FileGroupKey IconLanguage = new("IconLanguage");
         public FileGroupKey(string entityName, string? entityId = null)
         {
             Guard.NullOrEmpty(entityName, entityName);

VizhTalk.Learning.Domain/VizhTalk.Learning.Domain.csproj

@@ -8,7 +8,6 @@
 
   <ItemGroup>
     <Folder Include="Events\" />
-    <Folder Include="Exceptions\" />
     <Folder Include="Rules\" />
   </ItemGroup>