From 6ed5a1aab497bc986e1a0d16eed4c5f1ee0b3862 Mon Sep 17 00:00:00 2001
From: Eric <36512385+PhucNghi176@users.noreply.github.com>
Date: Thu, 17 Oct 2024 17:51:22 +0700
Subject: [PATCH] Add feature to add subjects to the system

Introduced a new feature for adding subjects to the system:
- Added `AddSubjectCommandHandler` class to handle the command for adding subjects.
- Implemented `Handle` method to check for existing subjects and add new ones.
- Added `Command.AddSubject` record to encapsulate data for adding subjects.
- Created `SubjectApi` class to define API routes and handle HTTP POST requests for adding subjects.
---
 .../Sbujects/AddSubjectCommandHandler.cs      | 36 +++++++++++++++++++
 .../Services/Subjects/Command.cs              |  8 +++++
 .../APIs/Subjects/SubjectApi.cs               | 20 +++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 MBS_COMMAND.Application/UserCases/Commands/Sbujects/AddSubjectCommandHandler.cs
 create mode 100644 MBS_COMMAND.Contract/Services/Subjects/Command.cs
 create mode 100644 MBS_COMMAND.Presentation/APIs/Subjects/SubjectApi.cs

diff --git a/MBS_COMMAND.Application/UserCases/Commands/Sbujects/AddSubjectCommandHandler.cs b/MBS_COMMAND.Application/UserCases/Commands/Sbujects/AddSubjectCommandHandler.cs
new file mode 100644
index 0000000..beab04e
--- /dev/null
+++ b/MBS_COMMAND.Application/UserCases/Commands/Sbujects/AddSubjectCommandHandler.cs
@@ -0,0 +1,36 @@
+using MBS_COMMAND.Contract.Abstractions.Messages;
+using MBS_COMMAND.Contract.Abstractions.Shared;
+using MBS_COMMAND.Contract.Services.Subjects;
+using MBS_COMMAND.Domain.Abstractions;
+using MBS_COMMAND.Domain.Abstractions.Repositories;
+using MBS_COMMAND.Domain.Entities;
+
+namespace MBS_COMMAND.Application.UserCases.Commands.Sbujects;
+
+public class AddSubjectCommandHandler(
+    IRepositoryBase<Subject, Guid> subjectRepository,
+    IRepositoryBase<Semester, Guid> semesterRepository,
+    IUnitOfWork unitOfWork)
+    : ICommandHandler<Command.AddSubject>
+{
+
+    public async Task<Result> Handle(Command.AddSubject request, CancellationToken cancellationToken)
+    {
+        var currentSemester = await semesterRepository.FindSingleAsync(x => x.IsActive, cancellationToken);
+        if (currentSemester == null)
+            return Result.Failure(new Error("404", "Semester Not Found"));
+        var isCurrentSubjectExist = subjectRepository.FindAll(x => x.Name == request.Name && x.SemesterId == currentSemester.Id);
+        if (isCurrentSubjectExist.Any())
+            return Result.Failure(new Error("404", "Subject Already Exist In This Semester"));
+        var subject = new Subject
+        {
+            Id = Guid.NewGuid(),
+            Name = request.Name,
+            Status = 1,
+            SemesterId = currentSemester.Id
+        };
+        subjectRepository.Add(subject);
+        await unitOfWork.SaveChangesAsync(cancellationToken);
+        return Result.Success();
+    }
+}
\ No newline at end of file
diff --git a/MBS_COMMAND.Contract/Services/Subjects/Command.cs b/MBS_COMMAND.Contract/Services/Subjects/Command.cs
new file mode 100644
index 0000000..5c97068
--- /dev/null
+++ b/MBS_COMMAND.Contract/Services/Subjects/Command.cs
@@ -0,0 +1,8 @@
+using MBS_COMMAND.Contract.Abstractions.Messages;
+
+namespace MBS_COMMAND.Contract.Services.Subjects;
+
+public static class Command
+{
+    public record AddSubject(string Name) : ICommand;
+}
\ No newline at end of file
diff --git a/MBS_COMMAND.Presentation/APIs/Subjects/SubjectApi.cs b/MBS_COMMAND.Presentation/APIs/Subjects/SubjectApi.cs
new file mode 100644
index 0000000..d56b3b0
--- /dev/null
+++ b/MBS_COMMAND.Presentation/APIs/Subjects/SubjectApi.cs
@@ -0,0 +1,20 @@
+using MBS_COMMAND.Contract.Services.Subjects;
+using MBS_COMMAND.Presentation.Abstractions;
+
+namespace MBS_COMMAND.Presentation.APIs.Subjects;
+
+public class SubjectApi : ApiEndpoint,ICarterModule
+{
+    private const string BaseUrl = "/api/v{version:apiVersion}/subjects";
+    public void AddRoutes(IEndpointRouteBuilder app)
+    {
+        var gr1 = app.NewVersionedApi("Subjects").MapGroup(BaseUrl).HasApiVersion(1);
+        gr1.MapPost(string.Empty, CreateSubject);
+    }
+    
+    private static async Task<IResult> CreateSubject(ISender sender,[FromBody] Command.AddSubject command)
+    {
+        var result = await sender.Send(command);
+        return result.IsFailure ? HandlerFailure(result) : Results.Ok(result);
+    }
+}
\ No newline at end of file