presence/Presence.API/Controllers/GroupController.cs

using domain.Request;
using domain.UseCase;
using Microsoft.AspNetCore.Mvc;
using Presence.API.Response;

namespace Presence.API.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    public class GroupController : ControllerBase
    {
        private readonly IGroupUseCase _groupService;

        public GroupController(IGroupUseCase groupService)
        {
            _groupService = groupService;
        }

        [HttpGet("/group")]
        public ActionResult<GroupResponse> GetAllGroups()
        {
            var result = _groupService
                .GetGroupsWithStudents()
                .Select(group => new GroupResponse
                {
                    Id = group.Id,
                    Name = group.Name,
                    Users = group.Users?.Select(
                        user => new UserResponse
                        {
                            Id = user.Id,
                            LastName = user.LastName,
                            FirstName = user.FirstName,
                            Patronymic = user.Patronymic
                        }).ToList()
                }).ToList();
            return Ok(result);
        }

        [HttpDelete("/group/{id}")]
        public IActionResult DeleteGroup(int id)
        {
            RemoveGroupRequest removeGroupRequest = new() { GroupId = id };
            bool isDeleted = _groupService.RemoveGroup(removeGroupRequest);
            if (!isDeleted) return NotFound();
            else return NoContent();
        }

        [HttpPost("/group")]
        public ActionResult<GroupResponse> PostGroup(AddGroupRequest addGroupRequest)
        {
            if (addGroupRequest is null)
                return BadRequest(new ArgumentNullException());

            var groupWithStudentsRequest = new AddGroupWithStudentRequest
            {
                AddGroupRequest = new AddGroupRequest { Name = addGroupRequest.Name },
                AddStudentRequests = addGroupRequest.Students
            };

            _groupService.AddGroupWithStudents(groupWithStudentsRequest);
            
            var createdGroup = _groupService.GetGroupsWithStudents()
                .FirstOrDefault(g => g.Name == addGroupRequest.Name);
                
            return CreatedAtAction(nameof(GetGroupById), new { id = createdGroup.Id }, createdGroup);
        }

        [HttpGet("/group/{id:int}")]
        public ActionResult<GroupResponse> GetGroupById(int id)
        {
            var group = _groupService.GetGroupsWithStudents().FirstOrDefault(g => g.Id == id);
            if (group == null)
                return NotFound();

            var response = new GroupResponse
            {
                Id = group.Id,
                Name = group.Name,
                Users = group.Users?.Select(
                    user => new UserResponse
                    {
                        Id = user.Id,
                        LastName = user.LastName,
                        FirstName = user.FirstName,
                        Patronymic = user.Patronymic
                    }).ToList()
            };
            return Ok(response);
        }

        [HttpGet("/group/{id}/subjects")]
        public ActionResult<GroupSubjectResponse> GetGroupSubject(int id)
        {
            return Ok(_groupService.GetGroupSubject(id));
        }
    }
}