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());

            bool isCreated = _groupService.AddGroup(addGroupRequest);
            if (isCreated) return CreatedAtAction(nameof(GetGroupByName), new { name = addGroupRequest.Name }, addGroupRequest );
            else return BadRequest();
        }

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

        [HttpGet("/group/{name}")]
        public ActionResult<GroupResponse> GetGroupByName(string name)
        {
            var result = _groupService
               .GetGroupsWithStudents()
               .Where(g => g.Name == name)
               .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 result.Count > 0 ? Ok(result) : NotFound();
        }
    }
}