package routes

import (
	"errors"
	"net/http"

	"git.artlef.fr/PersonalLibraryManager/internal/appcontext"
	"git.artlef.fr/PersonalLibraryManager/internal/dto"
	"git.artlef.fr/PersonalLibraryManager/internal/model"
	"git.artlef.fr/PersonalLibraryManager/internal/myvalidator"
	"golang.org/x/crypto/bcrypt"
	"gorm.io/gorm"
)

func PostSignupHandler(ac appcontext.AppContext) {
	if ac.Config.DisableRegistration {
		myvalidator.ReturnErrorsAsJsonResponse(&ac,
			myvalidator.HttpError{
				StatusCode: http.StatusForbidden,
				Err:        errors.New("Registration has been disabled on this instance."),
			})
		return
	}
	var user dto.UserSignup
	err := ac.C.ShouldBindJSON(&user)
	if err != nil {
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}
	userDb, err := userWsToDb(user)
	if err != nil {
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}

	var existingUser model.User
	err = ac.Db.Where("name = ?", user.Username).First(&existingUser).Error
	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}
	if err == nil {
		myvalidator.ReturnErrorsAsJsonResponse(&ac,
			myvalidator.HttpError{
				StatusCode: http.StatusInternalServerError,
				Err:        errors.New("An user with this name already exists."),
			})
		return
	}
	err = ac.Db.Model(&model.User{}).Save(&userDb).Error
	if err != nil {
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}
	ac.C.String(200, "Success")
}

func userWsToDb(u dto.UserSignup) (model.User, error) {
	user := model.User{
		Name:     u.Username,
		Password: "",
	}
	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(u.Password), bcrypt.DefaultCost)
	if err != nil {
		return user, err
	}
	user.Password = string(hashedPassword)
	return user, nil
}