Update

MBS_COMMAND.Application/UserCases/Commands/AddProjectToGroupCommandHandler.cs

@@ -0,0 +1,41 @@
+using MBS_COMMAND.Contract.Abstractions.Messages;
+using MBS_COMMAND.Contract.Abstractions.Shared;
+using MBS_COMMAND.Contract.Services.Projects;
+using MBS_COMMAND.Domain.Abstractions;
+using MBS_COMMAND.Domain.Abstractions.Repositories;
+using MBS_COMMAND.Domain.Entities;
+
+namespace MBS_COMMAND.Application.UserCases.Commands;
+
+public class AddProjectToGroupCommandHandler(
+    IRepositoryBase<Group, Guid> groupRepository,
+    IUnitOfWork unitOfWork,
+    ICurrentUserService currentUserService)
+    : ICommandHandler<Command.AddProject>
+{
+    public async Task<Result> Handle(Command.AddProject request, CancellationToken cancellationToken)
+    {
+        var group = await groupRepository.FindByIdAsync(request.GroupId, cancellationToken);
+        if (group == null)
+        {
+            return Result.Failure(new Error("404", "Group not found"));
+        }
+        if (group.LeaderId.ToString() != currentUserService.UserId)
+        {
+            return Result.Failure(new Error("403", "Only group leader can add project to group"));
+        }
+        if(group.ProjectId!=null)
+        {
+            return Result.Failure(new Error("400", "Group already has a project"));
+        }
+
+        group.Project=new Project
+        {
+            Name=request.Name,
+            Description=request.Description,
+        };
+        groupRepository.Update(group);
+        await unitOfWork.SaveChangesAsync(cancellationToken);
+        return Result.Success();
+    }
+}

MBS_COMMAND.Contract/Services/Projects/Command.cs

@@ -0,0 +1,8 @@
+using MBS_COMMAND.Contract.Abstractions.Messages;
+
+namespace MBS_COMMAND.Contract.Services.Projects;
+
+public static class Command
+{
+    public record AddProject(string Name, string Description, Guid GroupId) : ICommand;
+}

MBS_COMMAND.Presentation/APIs/Groups/GroupApi.cs

@@ -17,7 +17,6 @@ public void AddRoutes(IEndpointRouteBuilder app)
         gr1.MapGet("accept-invitation/{groupId}/{memberId}", AcceptGroupInvitation);
         gr1.MapPost("mentor", AddMentorToGroup);
     }
-
     private static async Task<IResult> AddMentorToGroup(ISender sender, [FromBody] Command.AddMentorToGroup request)
     {
         var result = await sender.Send(request);

MBS_COMMAND.Presentation/APIs/Projects/ProjectApi.cs

@@ -0,0 +1,19 @@
+using MBS_COMMAND.Contract.Services.Projects;
+using MBS_COMMAND.Presentation.Abstractions;
+
+namespace MBS_COMMAND.Presentation.APIs.Projects;
+
+public class ProjectApi : ApiEndpoint,ICarterModule
+{
+    private const string BaseUrl = "/api/v{version:apiVersion}/projects";
+    public void AddRoutes(IEndpointRouteBuilder app)
+    {
+        var gr1= app.NewVersionedApi("Projects").MapGroup(BaseUrl).HasApiVersion(1);
+        gr1.MapPost(string.Empty, AddProject).RequireAuthorization();
+    }
+    private static async Task<IResult> AddProject(ISender sender, [FromBody] Command.AddProject request)
+    {
+        var result = await sender.Send(request);
+        return result.IsFailure ? HandlerFailure(result) : Results.Ok(result);
+    }
+}