using GerbilManagerWebAPI.Models;
using GerbilManagerWebAPI.DAL;
using GerbilManagerWebAPI.Dtos;

using Microsoft.AspNetCore.Mvc;
using GerbilManagerWebAPI.Converter;

namespace GerbilManagerWebAPI.Controllers
{
    [ApiController]
    [Route("gerbils")]
    public class GerbilsController : ControllerBase
    {
        private readonly UnitOfWork unitOfWork;

        public GerbilsController(UnitOfWork unitOfWork)
        {
            this.unitOfWork = unitOfWork;
        }

        //GET /gerbils
        [HttpGet]
        public IEnumerable<GerbilDto> GetGerbils([FromQuery]string? name)
        {
            if(name != null)
            {
                return unitOfWork.GerbilRepository.Get(filter: x => x.Name == name).Select( gerbil => gerbil.AsDto());
            }

            var items = unitOfWork.GerbilRepository.Get().Select( gerbil => gerbil.AsDto());
            return items;
        }

        //GET /gerbils
        [HttpGet("{id}")]
        public ActionResult<GerbilDto> GetGerbil(Guid id)
        {
            var item = unitOfWork.GerbilRepository.GetByID(id).AsDto();

            if(item is null)
            {
                return NotFound();
            }
            return item;
        }

        [HttpPost()]
        public ActionResult<GerbilDto> CreateGerbil(CreateGerbilDto dto)
        {
            Gerbil gerbil = new Gerbil{
                Id = Guid.NewGuid(),
                Name = dto.Name,
                Gender = (Gender) (int) dto.Gender
            };

            if(dto.Litter != Guid.Empty)
            {
                gerbil.Litter = unitOfWork.LitterRepository.GetByID(dto.Litter);
            }

            if(dto.Breeder != Guid.Empty)
            {
                gerbil.Breeder = unitOfWork.BreederRepository.GetByID(dto.Breeder);
            }
            
            this.unitOfWork.GerbilRepository.Insert(gerbil);

            return CreatedAtAction(nameof(GetGerbil), new { id = gerbil.Id}, gerbil.AsDto());
        }

        [HttpPut("{id}")]
        public ActionResult UpdateGerbil(Guid id, UpdateGerbilDto gerbilDto)
        {
            var existingItem = unitOfWork.GerbilRepository.GetByID(id);
            if(existingItem is null)
            {
                return NotFound();
            }

            Gerbil updatedGerbil = existingItem with{
                Breeder = unitOfWork.BreederRepository.GetByID(gerbilDto.Breeder.Id),
                Litter = unitOfWork.LitterRepository.GetByID(gerbilDto.Litter.Id),
                Gender = (Gender) (int) gerbilDto.Gender,
                Name = gerbilDto.Name
            };

            unitOfWork.GerbilRepository.Update(updatedGerbil);
            return NoContent();
        }

        [HttpDelete("{id}")]
        public ActionResult DeleteGerbil(Guid id)
        {
            var existingGerbil = unitOfWork.GerbilRepository.GetByID(id);

            if(existingGerbil is null)
            {
                return NotFound();
            }

            unitOfWork.GerbilRepository.Delete(existingGerbil);

            return NoContent();
        }
    }
}