#ifndef CARDPACK_H
#define CARDPACK_H

#include <QtCore>
#include <QtDebug>

#include "ICardPack.h"
#include "../study/StudyRecord.h"
#include "IDictionary.h"
#include "Field.h"
#include "TreeItem.h"

class DicRecord;
class Card;

/**
  @brief Pack of cards

  A card pack consists of cards of certain card pattern.
  A card pattern is a combination of fields: question field and answer fields.
*/

class CardPack: public TreeItem, public ICardPack
{
    Q_OBJECT

public:
    static const QString SynonymDelimiter;
    static const QString HomonymDelimiter;

public:
    CardPack(IDictionary* dict);
    CardPack(IDictionary* dict, const CardPack* otherPack);
    ~CardPack();
    
    // Getters

    QString id() const;
    QString name() const { return m_name; } // See also id()
    QString curCardName() const { return m_curCardName; }
    IDictionary* dictionary() const { return m_dictionary; }
    QList<DicRecord*> getRecords() const;
    
    // Tree view
    const TreeItem* parent() const;
    const TreeItem* child( int /*aRow*/ ) const { return NULL; }
    int childCount() const { return 0; }
    int columnCount() const { return 3; }
    QVariant data( int aColumn ) const;
    int row() const;
    int topParentRow() const;
    
    // Fields
    QList<const Field*> getFields() const { return fields; }
    const Field* getQuestionField() const;
    QList<const Field*> getAnswerFields() const;
    bool getUsesExactAnswer() const { return usesExactAnswer; }
    
    // Cards
    QStringList getCardQuestions() const { return cardQuestions; }
    bool containsQuestion(const QString& question) const
        { return cardQuestions.contains(question); }
    int cardsNum() const { return cardQuestions.size(); }
    Card* getCard(const QString& cardName);
    
    // Study records
    QList<StudyRecord> getStudyRecords() const { return studyRecords.values(); }
    QList<QDateTime> getScheduledDates() const;
    QList<StudyRecord> getStudyRecords(QString cardId) const
        { return studyRecords.values(cardId); }
    int studyRecordsNum() const { return studyRecords.uniqueKeys().size(); }
    bool containsReviewedCards() const;
    StudyRecord getStudyRecord(QString cardId) const;
    QString findLastReviewedCard() const;
    
    // Study statistics
    QStringList getNewCards() const;
    QStringList getActiveCards() const;
    int getActiveRepeatingCardsNum() const;
    int countScheduledForTodayCards() const;
    QStringList getPriorityActiveCards() const;
    QStringList getLearningCards() const;
    int getLearningReviewsNum() const;
    int getTimeToNextLearning() const;
    int getInactiveLearningReviewsNum() const;
    QStringList getSmallestIntervalCards(const QStringList& priorityCards);
    int getTodayReviewedCardsNum() const;
    int getTodayNewCardsNum() const;
    
public:
    // Setters
    void setName( QString aName ) { m_name = aName; }
    void setCurCard( const QString aCardId );
    
    // Fields
    void setFields( QList<const Field*> aFields ) { fields = aFields; }
    void setField( int aPos, const Field* aField );
    void addField( const Field* aField ) { fields << aField; }
    void removeField( int aPos ) { fields.removeAt(aPos); }
    void removeField( const Field* aField ) { fields.removeAll( aField ); }
    void insertField( int aPos, const Field* aField ) { fields.insert( aPos, aField ); }
    void setQstField( const Field* aField );
    void setAnsFields( QList<const Field*> aFields );
    void setUsesExactAnswer(bool uses) { usesExactAnswer = uses; }

    void setReadingStudyFile(bool reading) { isReadingStudyFile = reading; }
    void addStudyRecord( const QString aCardId, const StudyRecord& aStudyRecord );

public:
    void generateQuestions();
    void disableDictRecordUpdates();
    void enableDictRecordUpdates();

private:
    void destroyCards();
    void addQuestionElementsForRecord(const DicRecord* record);
    void removeAbsentCards(QStringList& cardQuestions);
    void removeDelayedCard(const QString& cardName);

signals:
    void studyRecordAdded();
    void cardsGenerated();

private slots:
    void processEntryChangedEvent( int aEntryIx, int aFieldIx = IDictionary::AllFields );

private:
    static const int MinRequiredFieldsNum = 2;

private:
    QString m_name; // Not used
    IDictionary* m_dictionary;

        // The first field is the question, others are answers.
    QList<const Field*> fields;

    QStringList cardQuestions;   ///< Original order of questions
    QHash<QString, Card*> cards;   ///< Card name -> card (own)
    QString m_curCardName;
    QMultiHash<QString, StudyRecord> studyRecords;  // Card ID -> Study record
    bool isReadingStudyFile;
    bool usesExactAnswer;
};
#endif