using System;
using System.Threading.Tasks;
using AutoMapper;
using DevHive.Data.Interfaces;
using DevHive.Data.Models;
using DevHive.Services.Interfaces;
using DevHive.Services.Models.Technology;

namespace DevHive.Services.Services
{
	public class TechnologyService : ITechnologyService
	{
		private readonly ITechnologyRepository _technologyRepository;
		private readonly IMapper _technologyMapper;

		public TechnologyService(ITechnologyRepository technologyRepository, IMapper technologyMapper)
		{
			this._technologyRepository = technologyRepository;
			this._technologyMapper = technologyMapper;
		}

		#region Create

		public async Task<bool> Create(CreateTechnologyServiceModel technologyServiceModel)
		{
			if (await this._technologyRepository.DoesTechnologyNameExistAsync(technologyServiceModel.Name))
				throw new ArgumentException("Technology already exists!");

			Technology technology = this._technologyMapper.Map<Technology>(technologyServiceModel);
			bool result = await this._technologyRepository.AddAsync(technology);

			return result;
		}
		#endregion

		#region Read

		public async Task<TechnologyServiceModel> GetTechnologyById(Guid technologyId)
		{
			Technology technology = await this._technologyRepository.GetByIdAsync(technologyId);

			if (technology == null)
				throw new ArgumentException("The technology does not exist");

			return this._technologyMapper.Map<TechnologyServiceModel>(technology);
		}
		#endregion

		#region Update

		public async Task<bool> UpdateTechnology(Guid technologyId, UpdateTechnologyServiceModel updateTechnologyServiceModel)
		{
			if (!await this._technologyRepository.DoesTechnologyExistAsync(technologyId))
				throw new ArgumentException("Technology does not exist!");

			if (await this._technologyRepository.DoesTechnologyNameExistAsync(updateTechnologyServiceModel.Name))
				throw new ArgumentException("Technology name already exists!");

			updateTechnologyServiceModel.Id = technologyId;
			Technology technology = this._technologyMapper.Map<Technology>(updateTechnologyServiceModel);
			bool result = await this._technologyRepository.EditAsync(technology);

			return result;
		}
		#endregion

		#region Delete

		public async Task<bool> DeleteTechnology(Guid technologyId)
		{
			if (!await this._technologyRepository.DoesTechnologyExistAsync(technologyId))
				throw new ArgumentException("Technology does not exist!");

			Technology technology = await this._technologyRepository.GetByIdAsync(technologyId);
			bool result = await this._technologyRepository.DeleteAsync(technology);

			return result;
		}
		#endregion
	}
}