package users_service

import (
	"context"
	"errors"
	"evening_detective_server/internal/modules/email_sender"
	"evening_detective_server/internal/modules/password_generator"
	"evening_detective_server/internal/repos/users_repo"
	"fmt"

	"golang.org/x/crypto/bcrypt"
)

type UsersService struct {
	usersRepo         *users_repo.UsersRepo
	passwordGenerator password_generator.IPasswordGenerator
	emailSender       email_sender.IEmailSender
}

func NewUsersService(
	usersRepo *users_repo.UsersRepo,
	passwordGenerator password_generator.IPasswordGenerator,
	emailSender email_sender.IEmailSender,
) *UsersService {
	return &UsersService{
		usersRepo:         usersRepo,
		passwordGenerator: passwordGenerator,
		emailSender:       emailSender,
	}
}

func (s *UsersService) AddUser(
	ctx context.Context,
	username string,
	email string,
) error {
	password, err := s.passwordGenerator.Generate()
	if err != nil {
		return err
	}
	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
	if err != nil {
		return err
	}
	err = s.usersRepo.AddUser(
		ctx,
		username,
		email,
		string(hashedPassword),
		"user",
	)
	if err != nil {
		return err
	}

	err = s.emailSender.Send(ctx, email_sender.Message{
		To:      email,
		Subject: "Приветствую тебя, детектив!",
		Body:    fmt.Sprintf("Вот твой пароль для входа в систему: %s", password),
	})

	return err
}

func (s *UsersService) RefreshPassword(
	ctx context.Context,
	email string,
) error {
	password, err := s.passwordGenerator.Generate()
	if err != nil {
		return err
	}
	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
	if err != nil {
		return err
	}

	err = s.usersRepo.UpdateUserPassword(
		ctx,
		email,
		string(hashedPassword),
	)
	if err != nil {
		return err
	}

	err = s.emailSender.Send(ctx, email_sender.Message{
		To:      email,
		Subject: "Приветствую тебя, детектив!",
		Body:    fmt.Sprintf("Вот твой новый пароль для входа в систему, не теряй: %s", password),
	})

	return err
}

func (s *UsersService) Login(
	ctx context.Context,
	email string,
	password string,
) error {
	user, err := s.usersRepo.GetUserByEmail(
		ctx,
		email,
	)
	if err != nil {
		return err
	}

	if err = bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password)); err != nil {
		return errors.New("Не верен email или пароль")
	}

	fmt.Println(user, err)

	// gen tokens (module)

	// save refresh token?

	return nil // claims?
}