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#include "WordDrillModel.h"
#include "../dictionary/Card.h"
#include "../dictionary/CardPack.h"
#include "StudySettings.h"
#include <stdlib.h>
#include <time.h>
WordDrillModel::WordDrillModel( CardPack* aCardPack ):
IStudyModel( aCardPack ), m_historyCurPackStart(0)
{
curCardNum = NoCardIndex;
srand( time(NULL) );
connect( aCardPack, SIGNAL(cardsGenerated()), SLOT(updateStudyState()) );
generateFreshPack();
pickNextCard();
}
/** Get current card.
* If the current card doesn't exist any more, find the next valid card.
*/
Card* WordDrillModel::getCurCard() const
{
if( m_cardHistory.isEmpty() || curCardNum < 0 ) // No cards in the pack
return NULL;
if( curCardNum >= m_cardHistory.size() )
return NULL;
QString cardName = m_cardHistory.at(curCardNum);
return cardPack->getCard( cardName );
}
void WordDrillModel::updateStudyState()
{
generateFreshPack();
cleanHistoryFromRemovedCards();
if( getCurCard() )
emit curCardUpdated();
else
pickNextCard();
}
void WordDrillModel::generateFreshPack()
{
m_freshPack = cardPack->getCardQuestions();
// Remove already reviewed cards
if( m_historyCurPackStart >= m_cardHistory.size() )
return;
foreach( QString reviewedCard, m_cardHistory.mid( m_historyCurPackStart ) )
m_freshPack.removeAll( reviewedCard );
}
void WordDrillModel::cleanHistoryFromRemovedCards()
{
if( m_cardHistory.isEmpty() )
return;
bool cardsRemoved = false;
QMutableStringListIterator it( m_cardHistory );
int i = 0;
while( it.hasNext() )
{
QString cardName = it.next();
if( !cardPack->containsQuestion( cardName ) )
{
it.remove();
cardsRemoved = true;
if( i < curCardNum )
curCardNum--;
}
i++;
}
if( cardsRemoved )
{
if( curCardNum >= m_cardHistory.size() )
curCardNum = m_cardHistory.size() - 1;
emit nextCardSelected();
}
}
/** Picks a random card. Removes the selected card from the fresh pack and adds it to the history.
* Thus, the new card is the last entry in the history.
* This function guarantees that the new card's question will be different from the previous one, unless there is no choice.
*
* Updates #m_curCardNum.
*/
void WordDrillModel::pickNextCard()
{
QString selectedCardName;
const Card* selectedCard = NULL;
do
{
if( m_freshPack.isEmpty() ) // No fresh cards
{
m_historyCurPackStart = m_cardHistory.size(); // Refers beyond the history pack
generateFreshPack();
if( m_freshPack.isEmpty() ) // Still no any cards available - no useful cards in the dictionary or it's empty
{
curCardNum = NoCardIndex;
emit nextCardSelected();
return;
}
}
if( m_freshPack.size() == 1 ) // Only 1 fresh card, no choice
selectedCardName = m_freshPack.takeFirst();
else
{
int selectedCardNum;
if( StudySettings::inst()->showRandomly )
selectedCardNum = rand() % m_freshPack.size();
else
selectedCardNum = 0;
if( !m_cardHistory.isEmpty() )
while( m_freshPack[ selectedCardNum ] == m_cardHistory.last() ) // The new question must be different from the current one
{
selectedCardNum++;
selectedCardNum %= m_freshPack.size();
}
selectedCardName = m_freshPack.takeAt( selectedCardNum );
}
selectedCard = cardPack->getCard( selectedCardName );
}
while( !selectedCard );
m_cardHistory << selectedCardName;
curCardNum = m_cardHistory.size() - 1;
emit nextCardSelected();
}
/** Go back along the history line.
* @return true, if the transition was successful
*/
bool WordDrillModel::goBack()
{
if( !canGoBack() )
return false;
curCardNum--;
emit nextCardSelected();
return true;
}
/** Go forward along the history line.
* @return true, if the transition was successful
*/
bool WordDrillModel::goForward()
{
if( !canGoForward() )
return false;
curCardNum++;
emit nextCardSelected();
return true;
}
bool WordDrillModel::canGoBack()
{
return curCardNum > 0;
}
bool WordDrillModel::canGoForward()
{
return curCardNum < m_cardHistory.size() - 1;
}
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