package services

import (
	"learnsteam/cslms-api/internal/models"
	"learnsteam/cslms-api/internal/repositories"

	"github.com/google/uuid"
)

type userQuizPaperService struct {
	repository repositories.UserQuizPaperRepository
}

type UserQuizPaperService interface {
	List(string, int, int) (*[]models.UserQuizPaper, error)
	Total(string) (int64, error)

	Find(int64) (*models.UserQuizPaper, error)
	Create(*models.UserQuizPaper) (*models.UserQuizPaper, error)
	Insert([]models.UserQuizPaper) ([]models.UserQuizPaper, error)
	Update(*models.UserQuizPaper) (*models.UserQuizPaper, error)
	Delete(string) error
	Generate([]int64, *models.QuizPaper) []models.UserQuizPaper
}

func NewUserQuizPaperService(repository repositories.UserQuizPaperRepository) UserQuizPaperService {
	return &userQuizPaperService{
		repository: repository,
	}
}

func (s *userQuizPaperService) List(q string, page int, limit int) (*[]models.UserQuizPaper, error) {
	return s.repository.List(q, page, limit)
}

func (s *userQuizPaperService) Total(q string) (int64, error) {
	return s.repository.Total(q)
}

func (s *userQuizPaperService) Find(id int64) (*models.UserQuizPaper, error) {
	return s.repository.Find(id)
}

func (s *userQuizPaperService) Create(userQuizPaper *models.UserQuizPaper) (*models.UserQuizPaper, error) {
	result, err := s.repository.Create(userQuizPaper)

	return result, err
}

func (s *userQuizPaperService) Insert(items []models.UserQuizPaper) ([]models.UserQuizPaper, error) {
	result, err := s.repository.Insert(items)

	return result, err
}

func (s *userQuizPaperService) Update(userQuizPaper *models.UserQuizPaper) (*models.UserQuizPaper, error) {
	result, err := s.repository.Update(userQuizPaper)

	return result, err
}

func (s *userQuizPaperService) Delete(id string) error {
	err := s.repository.Delete(id)

	return err
}

func (s *userQuizPaperService) Generate(users []int64, quizPaper *models.QuizPaper) []models.UserQuizPaper {
	var userQuizPapers []models.UserQuizPaper

	for _, user_id := range users {
		userQuizPaper := models.UserQuizPaper{
			GUID:        uuid.NewString(),
			CenterID:    quizPaper.CenterID,
			UserID:      user_id,
			QuizPaperID: quizPaper.ID,
		}

		userQuizPapers = append(userQuizPapers, userQuizPaper)
	}

	return userQuizPapers
}