#include <QMessageBox>
#include <QApplication>
#include "databaseinstructors.h"

DataBaseInstructors::DataBaseInstructors(DataBaseLMS* dbLMS):
    adminMode(false)
{
    this->dbLMS = dbLMS;
}

DataBaseInstructors::~DataBaseInstructors()
{

}

bool DataBaseInstructors::AuthorizationInstructor(QString login, QString password)
{
    if(! dbLMS->transactionBegin())
        return false;

    if(int id = dbLMS->selectInstructorID(login, password))
    {
        if(dbLMS->updateInstructorLoggedIn(id, true))
            return dbLMS->transactionEnd();
    }

    dbLMS->transactionEnd();
    return false;
}

bool DataBaseInstructors::deAuthorizationInstructor(QString login)
{
    if(! dbLMS->transactionBegin())
        return false;

    if(int id = dbLMS->selectInstructorID(login))
    {
        if(dbLMS->updateInstructorLoggedIn(id, false))
            return dbLMS->transactionEnd();
    }

    dbLMS->transactionEnd();
    return false;
}

QList<Instructor> DataBaseInstructors::getListInstructors()
{
    return dbLMS->selectAllInstructors();
}

Instructor DataBaseInstructors::getInstructor(int id)
{
    return dbLMS->selectInstructor(id);
}

int DataBaseInstructors::newInstructor()
{
    return dbLMS->insertInstructor();
}

int DataBaseInstructors::deleteInstructor(int id)
{
    return dbLMS->deleteInstructor(id);
}

int DataBaseInstructors::editInstructor(Instructor instructor)
{
    //Проверка дублирования логина и имени
    QList<Instructor> listInstructors = dbLMS->selectAllInstructors();
    for(Instructor exist_instructor : listInstructors)
    {
        if(instructor.getLogin() == exist_instructor.getLogin() && instructor.getID() != exist_instructor.getID())
        {//Логин уже существует!
            QMessageBox::critical(nullptr, tr("Editing error!"),
                                  tr("An existing instructor login has been entered.\nThe changes will not be accepted."));
            return 0;
        }

        if(instructor.getName() == exist_instructor.getName() && instructor.getID() != exist_instructor.getID())
        {//Имя уже существует
            QMessageBox::warning(nullptr, tr("Editing warning!"),
                                  tr("An existing instructor name has been entered."));
            //return 0;
        }
    }

    return dbLMS->updateInstructor(instructor);
}

bool DataBaseInstructors::isAdmin(int id)
{
    return dbLMS->selectInstructorIsAdmin(id);
}

bool DataBaseInstructors::isArchived(int id)
{
    return dbLMS->selectInstructorArchived(id);
}

bool DataBaseInstructors::existLogin(QString login)
{

}