#pragma once

#include <QString>

// TODO: tests
// - empty fields
// - too long fields (use arrays instead of QByteArray?)
// - try to break salt/hash fields

// TODO: make all public fields private
class User
{
public:
    /*!
     * \brief User - create user with given `login` and `password`. `salt` and
     * `passwordHash` will be generated and stored instead of real `password`.
     * Will *not* be committed to db automatically. Should be used to create a
     * new user
     * \code
     * User user{"admin", "123"};
     * auto id = user.createInDb();
     * if (id == rsshit::db::IdNotFound) // error
     * ...
     * \param login - max len is 32
     * \param password - max len is 32
     */
    explicit User(const QString &login, const QString &password);

    /*!
     * \brief User - create user with given `login` and try to fetch data from db
     * automatically. Should be used for existing users
     * \code
     * User user{"admin"};
     * if (user.getDbId() == rsshit::db::IdNotFound) // user not found
     * ...
     * if (!user.verifyPassword("123)) // wrong password
     * ...
     */
    explicit User(const QString &login);

public:
    /*!
     * \brief getDbId - check if user with corresponding `link` exists in db
     * and return db id if any (fills `id` var as well)
     * \return id on success, 0 otherwise
     */
    int getDbId();

    /*!
     * \brief fetchFromDb - fetch db user record with corresponding `login`
     * \return existing `id` on success, 0 otherwise
     */
    int fetchFromDb();

    /*!
     * \brief existsInDb - helper function, checks if `this` has valid `id`, or
     *  db record with corresponding `login` exists (calls `getDbId` under the hood)
     * \return true if exists, false otherwise
     */
    bool existsInDb();

    /*!
     * \brief createInDb - create user in db, fill `id`
     * \return new user id on success, 0 otherwise
     */
    int createInDb();

    /*!
     * \brief getOrInsertDbId - get existing user id or try to create a new
     * user and get its id
     * \return existing or new user id on success, 0 otherwise
     */
    int getOrInsertDbId();

    bool verifyPassword(const QString &password);

private:
    int m_id{0};
    QString m_login;
    QByteArray m_salt;
    QByteArray m_passwordHash;

private:
    QByteArray hashPassword(const QString &password);
};