using SurveyBackend.Services.Exceptions;
using SurveyLib.Core.Models;
using SurveyLib.Core.Repositories;
using SurveyLib.Core.Services;

namespace SurveyBackend.Services.Services;

public class AnswerVariantsService : IAnswerVariantsService
{
    private readonly IAnswerVariantsRepository _answerVariantsRepository;
    private readonly IQuestionRepository _questionRepository;

    public AnswerVariantsService(IAnswerVariantsRepository answerVariantsRepository,
        IQuestionRepository questionRepository)
    {
        _answerVariantsRepository = answerVariantsRepository;
        _questionRepository = questionRepository;
    }

    // TODO: любой кто будет читать этот код, я понимаю проблему дублирования, не злитесь пожалуйста, я потом пишу на адекватные валидаторы и не будет дублирования
    public async Task AddAnswerVariantAsync(AnswerVariant answerVariant)
    {
        var question = await _questionRepository.GetByIdAsync(answerVariant.QuestionId);
        if (question is null)
        {
            throw new NotFoundException("Question not found");
        }

        await _answerVariantsRepository.AddAsync(answerVariant);
    }

    public async Task UpdateAnswerVariantAsync(AnswerVariant answerVariant)
    {
        var question = await _questionRepository.GetByIdAsync(answerVariant.QuestionId);
        if (question is null)
        {
            throw new NotFoundException("Question not found");
        }

        var answerVariantBase = await _answerVariantsRepository.GetByIdAsNoTrackingAsync(answerVariant.Id);
        if (answerVariantBase is null)
        {
            throw new NotFoundException("Answer Variant not found");
        }

        answerVariant.QuestionId = answerVariantBase.QuestionId;

        await _answerVariantsRepository.UpdateAsync(answerVariant);
    }

    public async Task DeleteAnswerVariantAsync(int id)
    {
        var answerVariantBase = await _answerVariantsRepository.GetByIdAsNoTrackingAsync(id);
        if (answerVariantBase is null)
        {
            throw new NotFoundException("Answer Variant not found");
        }

        await _answerVariantsRepository.DeleteAsync(id);
    }

    public async Task<AnswerVariant> GetAnswerVariantByIdAsync(int id)
    {
        var answerVariant = await _answerVariantsRepository.GetByIdAsync(id);
        if (answerVariant is null)
        {
            throw new NotFoundException("Answer Variant not found");
        }

        return answerVariant;
    }

    public async Task<IEnumerable<AnswerVariant>> GetAnswerVariantsByQuestionIdAsync(int questionId)
    {
        var question = await _questionRepository.GetByIdAsync(questionId);
        if (question is null)
        {
            throw new NotFoundException("Question not found");
        }

        return await _answerVariantsRepository.GetAnswerVariantsByQuestionIdAsync(questionId);
    }
}