/***************************************************************************
 *   Copyright (C) 2007 by Tobias Koenig <tokoe@kde.org>                   *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 ***************************************************************************/

#ifndef _OKULAR_TEXTDOCUMENTGENERATOR_H_
#define _OKULAR_TEXTDOCUMENTGENERATOR_H_

#include "okularcore_export.h"

#include "../interfaces/configinterface.h"
#include "document.h"
#include "generator.h"
#include "textdocumentsettings.h"

class QTextBlock;
class QTextDocument;

namespace Okular
{
class TextDocumentConverterPrivate;
class TextDocumentGenerator;
class TextDocumentGeneratorPrivate;

class OKULARCORE_EXPORT TextDocumentConverter : public QObject
{
    Q_OBJECT

    friend class TextDocumentGenerator;
    friend class TextDocumentGeneratorPrivate;

public:
    /**
     * Creates a new generic converter.
     */
    TextDocumentConverter();

    /**
     * Destroys the generic converter.
     */
    ~TextDocumentConverter() override;

    /**
     * Returns the generated QTextDocument object. The caller takes ownership of the QTextDocument
     *
     * @note there is no need to implement this one if you implement convertWithPassword
     */
    virtual QTextDocument *convert(const QString &fileName);

    /**
     * Returns the generated QTextDocument object.
     */
    virtual Document::OpenResult convertWithPassword(const QString &fileName, const QString &password);

    /**
     * Returns the generated QTextDocument object. Will be null if convert didn't succeed
     */
    QTextDocument *document();

Q_SIGNALS:
    /**
     * Adds a new link object which is located between cursorBegin and
     * cursorEnd to the generator.
     */
    void addAction(Okular::Action *link, int cursorBegin, int cursorEnd);

    /**
     * Adds a new annotation object which is located between cursorBegin and
     * cursorEnd to the generator.
     */
    void addAnnotation(Okular::Annotation *annotation, int cursorBegin, int cursorEnd);

    /**
     * Adds a new title at the given level which is located as position to the generator.
     */
    void addTitle(int level, const QString &title, const QTextBlock &position);

    /**
     * Adds a set of meta data to the generator.
     */
    void addMetaData(const QString &key, const QString &value, const QString &title); // clazy:exclude=overloaded-signal

    // TODO When we can do a BIC change rename one of the two addMetaData functions (or see if we can kill one)
    /**
     * Adds a set of meta data to the generator.
     *
     * @since 0.7 (KDE 4.1)
     */
    void addMetaData(DocumentInfo::Key key, const QString &value); // clazy:exclude=overloaded-signal

    /**
     * This signal should be emitted whenever an error occurred in the converter.
     *
     * @param message The message which should be shown to the user.
     * @param duration The time that the message should be shown to the user.
     */
    void error(const QString &message, int duration);

    /**
     * This signal should be emitted whenever the user should be warned.
     *
     * @param message The message which should be shown to the user.
     * @param duration The time that the message should be shown to the user.
     */
    void warning(const QString &message, int duration);

    /**
     * This signal should be emitted whenever the user should be noticed.
     *
     * @param message The message which should be shown to the user.
     * @param duration The time that the message should be shown to the user.
     */
    void notice(const QString &message, int duration);

protected:
    /**
     * Sets the converted QTextDocument object.
     */
    void setDocument(QTextDocument *document);

    /**
     * This method can be used to calculate the viewport for a given text block.
     *
     * @note This method should be called at the end of the conversion, because it
     *       triggers QTextDocument to do the layout calculation.
     */
    DocumentViewport calculateViewport(QTextDocument *document, const QTextBlock &block);

    /**
     * Returns the generator that owns this converter.
     *
     * @note May be null if the converter was not created for a generator.
     *
     * @since 0.7 (KDE 4.1)
     */
    TextDocumentGenerator *generator() const;

private:
    TextDocumentConverterPrivate *d_ptr;
    Q_DECLARE_PRIVATE(TextDocumentConverter)
    Q_DISABLE_COPY(TextDocumentConverter)
};

/**
 * @brief QTextDocument-based Generator
 *
 * This generator provides a document in the form of a QTextDocument object,
 * parsed using a specialized TextDocumentConverter.
 */
class OKULARCORE_EXPORT TextDocumentGenerator : public Generator, public Okular::ConfigInterface
{
    /// @cond PRIVATE
    friend class TextDocumentConverter;
    /// @endcond

    Q_OBJECT
    Q_INTERFACES(Okular::ConfigInterface)

public:
    /**
     * Creates a new generator that uses the specified @p converter.
     *
     * @param converter The text document converter.
     * @param configName - see Okular::TextDocumentSettings
     * @param parent The parent object.
     * @param args The arguments.
     *
     * @note the generator will take ownership of the converter, so you
     *       don't have to delete it yourself
     * @since 0.17 (KDE 4.11)
     */
    TextDocumentGenerator(TextDocumentConverter *converter, const QString &configName, QObject *parent, const QVariantList &args);

    ~TextDocumentGenerator() override;

    // [INHERITED] load a document and fill up the pagesVector
    Document::OpenResult loadDocumentWithPassword(const QString &fileName, QVector<Okular::Page *> &pagesVector, const QString &password) override;

    // [INHERITED] perform actions on document / pages
    bool canGeneratePixmap() const override;
    void generatePixmap(Okular::PixmapRequest *request) override;

    // [INHERITED] print document using already configured QPrinter
    bool print(QPrinter &printer) override;

    // [INHERITED] text exporting
    Okular::ExportFormat::List exportFormats() const override;
    bool exportTo(const QString &fileName, const Okular::ExportFormat &format) override;

    // [INHERITED] config interface
    /// By default checks if the default font has changed or not
    bool reparseConfig() override;
    /// Does nothing by default. You need to reimplement it in your generator
    void addPages(KConfigDialog *dlg) override;

    /**
     * Config skeleton for TextDocumentSettingsWidget
     *
     * You must use new construtor to initialize TextDocumentSettings,
     * that contain @p configName .
     *
     * @since 0.17 (KDE 4.11)
     */
    TextDocumentSettings *generalSettings();

    Okular::DocumentInfo generateDocumentInfo(const QSet<DocumentInfo::Key> &keys) const override;
    const Okular::DocumentSynopsis *generateDocumentSynopsis() override;

protected:
    bool doCloseDocument() override;
    Okular::TextPage *textPage(Okular::TextRequest *request) override;

    /* @since 1.8 */
    TextDocumentConverter *converter();

    /* @since 1.8 */
    void setTextDocument(QTextDocument *textDocument);

private:
    Q_DECLARE_PRIVATE(TextDocumentGenerator)
    Q_DISABLE_COPY(TextDocumentGenerator)
};

}

#endif