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

using GerbilManagerWebAPI.Converter;

using Microsoft.AspNetCore.Mvc;
using System.Xml;

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

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

        //GET /gerbils
        [HttpGet]
        public IEnumerable<LitterDto> GetLitters()
        {
            var items = unitOfWork.LitterRepository.Get().Select( litter => litter.AsDto());
            return items;
        }

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

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

        [HttpPost()]
        public ActionResult<LitterDto> CreateLitter(CreateLitterDto dto)
        {
            //Sanity check if father is male and mother is female
            var father = this.unitOfWork.GerbilRepository.GetByID(dto.Father ?? Guid.Empty);
            var mother = this.unitOfWork.GerbilRepository.GetByID(dto.Mother ?? Guid.Empty);
            if(father?.Gender == Gender.female || mother?.Gender == Gender.male)
            {
                return BadRequest($"The mothers gender is {mother?.Gender.ToString() ?? "unknown"} and the fathers {father?.Gender.ToString() ?? "unknown"}.");
            }

            Litter litter = new Litter{
                Id = Guid.NewGuid(),
                Date = dto.Date,
                Father = this.unitOfWork.GerbilRepository.GetByID(dto.Father ?? Guid.Empty),
                Mother = this.unitOfWork.GerbilRepository.GetByID(dto.Mother ?? Guid.Empty),
                Name = dto.Name,
                Strength = dto.Strength
            };

            this.unitOfWork.LitterRepository.Insert(litter);
            this.unitOfWork.Save();

            return CreatedAtAction(nameof(GetLitter), new { id = litter.Id}, litter.AsDto());
        }

        [HttpPut("{id}")]
        public ActionResult UpdateLitter(Guid id, UpdateLitterDto litterDto)
        {
            var existingItem = unitOfWork.LitterRepository.GetByID(id);
            if(existingItem is null)
            {
                return NotFound();
            }

            Litter updatedLitter = existingItem with{
                Date = litterDto.Date ?? DateTime.Now,
                Strength = litterDto.Strength,
                Father = this.unitOfWork.GerbilRepository.GetByID(litterDto.Father ?? Guid.Empty),
                Mother = this.unitOfWork.GerbilRepository.GetByID(litterDto.Mother ?? Guid.Empty),
                Name = litterDto.Name
            };

            unitOfWork.LitterRepository.Update(updatedLitter);
            this.unitOfWork.Save();
            
            return NoContent();
        }

        [HttpDelete("{id}")]
        public ActionResult DeleteLitter(Guid id)
        {
            var existingLitter = unitOfWork.LitterRepository.GetByID(id);

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

            unitOfWork.LitterRepository.Delete(existingLitter);
            this.unitOfWork.Save();

            return NoContent();
        }
    }
}