package models

import (
	"errors"
	"fmt"
	"golang.org/x/crypto/bcrypt"
	"log"
	"rate-it-api/database"
	"regexp"
	"strings"
)

// User define a user
type User struct {
	UUID      string
	Pseudo    string
	Firstname string `default:""`
	Lastname  string `default:"bite"`
	Password  string
	Email     string
	Hash      string
	Verify    int
}

type regexCheck struct {
	Regexp  string
	Message string
}

func validatePassword(password string) error {

	if password == "" {

		return errors.New("Password must be provided")
	}

	regexPassword := [5]regexCheck{
		{".{6,}", "must be at least 6 character long"},
		{"[0-9]+", "must contains one digit from 0-9"},
		{"[a-z]+", "must contains one lowercase characters"},
		{"[A-Z]+", "must contains one uppercase characters"},
		{"[\\^#\\.\\@\\$\\%\\[\\]\\;\\:\\,]+", "must contains one of this special parameters : ^, #, ., @, $, %, [, ], ;, or comma:"},
	}

	/**
	* Passwword must fit some requirements:
	*	- length at least 6 characters
	*	- must contains one digit from 0-9
	*	- must contains one lowercase characters
	*	- must contains one uppercase characters
	*	- must contains one special symbols in the list \"@#$%\"
	*	- match anything with previous condition checking
	 */
	for _, regex := range regexPassword {

		r, _ := regexp.Compile(regex.Regexp)

		match := r.MatchString(password)

		if !match {

			return errors.New(strings.Join([]string{"Password incorrect", regex.Message}, ": "))
		}
	}

	return nil
}

func validateEmail(email string) error {

	if email == "" {

		return errors.New("Email must be provided")
	}

	r, _ := regexp.Compile(".+@.+")

	match := r.MatchString(email)

	if !match {

		return errors.New(strings.Join([]string{"Email incorrect"}, ": "))
	}

	return nil
}

func (u *User) validate() error {

	err := validatePassword(u.Password)

	if err != nil {

		return err
	}

	err = validateEmail(u.Email)

	if err != nil {

		return err
	}

	return nil
}

// UserGetByEmail retrieve a user following its email
func UserGetByEmail(userEmail string) (User, error) {

	var user User

	err := validateEmail(userEmail)
	if err != nil {
		return user, err
	}

	query := fmt.Sprintf("SELECT uuid, email, password, verify FROM users WHERE email=\"%s\"", userEmail)

	return userGet(query)

}

// UserGetByUUID retrieve a user following its hash
func UserGetByUUID(UUID string) (User, error) {

	query := fmt.Sprintf("SELECT uuid, email, password, verify FROM users WHERE uuid=\"%s\"", UUID)

	return userGet(query)

}

// UserValidate validate a user mail
func UserValidate(uuid string) error {

	query := fmt.Sprintf(`UPDATE users SET verify=1 WHERE uuid='%s'`, uuid)
	fmt.Println(query)

	_, err := database.MysqlExecInsert(query)

	if err != nil {
		fmt.Println(err.Error())
		return err
	}

	return nil
}

// UserUpdatePassword validate a user mail
func UserUpdatePassword(email string, password string) error {

	query := fmt.Sprintf(`UPDATE users SET password="%s" WHERE email='%s'`, password, email)
	fmt.Println(query)

	_, err := database.MysqlExecInsert(query)

	if err != nil {
		fmt.Println(err.Error())
		return err
	}

	return nil
}

// userGet retrieve a user
func userGet(query string) (User, error) {

	var user User

	results, errSelect := database.MysqlExecSelect(query)

	if errSelect != nil {

		return user, errSelect
	}

	var (
		uuid     string
		email    string
		password string
		verify   int
	)

	if !results.Next() {
		return user, errors.New("User not found")
	}

	err := results.Scan(&uuid, &email, &password, &verify)

	if err != nil {
		log.Fatal(err)
	}

	user = User{
		UUID:     uuid,
		Email:    email,
		Password: password,
		Verify:   verify,
	}

	return user, nil
}

// Create create a new user from json data
func (u *User) Create() error {

	err := u.validate()

	if err != nil {
		return err
	}

	// password hashing
	password, err := bcrypt.GenerateFromPassword([]byte(u.Password), 2)

	if err != nil {
		return err
	}

	//Set up hashing data
	u.Verify = 0

	query := fmt.Sprintf(`INSERT INTO users (uuid, email, password, lastname, firstname, verify)
        VALUES ("%s", "%s", "%s", "%s", "%s", "%d")`, u.UUID, u.Email, password, u.Lastname, u.Firstname, u.Verify)

	_, err = database.MysqlExecInsert(query)

	if err != nil {
		return err
	}

	return nil
}