/******************************************************************************
 *
 *  Copyright 2008 Szymon Tomasz Stefanek <pragma@kvirc.net>
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *******************************************************************************/

#ifndef __MESSAGELIST_CORE_MESSAGEITEM_H__
#define __MESSAGELIST_CORE_MESSAGEITEM_H__

#include <core/item.h>
#include <core/modelinvariantindex.h>

#include <QPixmap>
#include <QString>
#include <QColor>

#include <messagelist_export.h>
#include "theme.h"

namespace Akonadi
{
class Item;
}

namespace MessageList
{

namespace Core
{

class MessageItemPrivate;

class MESSAGELIST_EXPORT MessageItem : public Item, public ModelInvariantIndex
{
public:
    class MESSAGELIST_EXPORT Tag
    {
    public:
        explicit Tag(const QPixmap &pix, const QString &tagName, const QString &tagId);
        ~Tag();
        const QPixmap &pixmap() const;
        const QString &name() const;
        const QString &id() const;
        const QColor &textColor() const;
        const QColor &backgroundColor() const;
        const QFont &font() const;
        int priority() const;

        void setTextColor(const QColor &textColor);
        void setBackgroundColor(const QColor &backgroundColor);
        void setFont(const QFont &font);
        void setPriority(int priority);

    private:
        class Private;
        Private *const d;
    };

    enum ThreadingStatus {
        PerfectParentFound,     ///< this message found a perfect parent to attach to
        ImperfectParentFound,   ///< this message found an imperfect parent to attach to (might be fixed later)
        ParentMissing,          ///< this message might belong to a thread but its parent is actually missing
        NonThreadable           ///< this message does not look as being threadable
    };

    enum EncryptionState {
        NotEncrypted,
        PartiallyEncrypted,
        FullyEncrypted,
        EncryptionStateUnknown
    };

    enum SignatureState {
        NotSigned,
        PartiallySigned,
        FullySigned,
        SignatureStateUnknown
    };

    explicit MessageItem();
    virtual ~MessageItem();

public:

    /// Returns the list of tags for this item.
    virtual QList< Tag * > tagList() const;

    /// Returns true if this message has an annotation.
    virtual bool hasAnnotation() const;

    /// Returns the annotation of the message, given that hasAnnotation() is true
    QString annotation() const;

    /// Shows a dialog to edit or delete the annotation
    void editAnnotation();

    /**
    * Returns Tag associated to this message that has the specified id or 0
    * if no such tag exists. mTagList will be 0 in 99% of the cases.
    */
    const Tag *findTag(const QString &szTagId) const;

    QString tagListDescription() const;

    /// Deletes all cached tags. The next time someone asks this item for the tags, they are
    /// fetched again
    void invalidateTagCache();

    /// Same as invalidateTagCache(), only for the annotation
    void invalidateAnnotationCache();

    const QColor &textColor() const;

    const QColor &backgroundColor() const;

    bool isBold() const
    {
        return font().bold();
    }

    bool isItalic() const
    {
        return font().italic();
    }

    SignatureState signatureState() const;

    void setSignatureState(SignatureState state);

    EncryptionState encryptionState() const;

    void setEncryptionState(EncryptionState state);

    QByteArray messageIdMD5() const;

    void setMessageIdMD5(const QByteArray &md5);

    QByteArray inReplyToIdMD5() const;

    void setInReplyToIdMD5(const QByteArray &md5);

    QByteArray referencesIdMD5() const;

    void setReferencesIdMD5(const QByteArray &md5);

    void setSubjectIsPrefixed(bool subjectIsPrefixed);

    bool subjectIsPrefixed() const;

    QByteArray strippedSubjectMD5() const;

    void setStrippedSubjectMD5(const QByteArray &md5);

    bool aboutToBeRemoved() const;

    void setAboutToBeRemoved(bool aboutToBeRemoved);

    ThreadingStatus threadingStatus() const;

    void setThreadingStatus(ThreadingStatus threadingStatus);

    unsigned long uniqueId() const;

    Akonadi::Item akonadiItem() const;
    void setAkonadiItem(const Akonadi::Item &item);

    MessageItem *topmostMessage();

    QString accessibleText(const MessageList::Core::Theme *theme, int columnIndex);

    /**
    * Appends the whole subtree originating at this item
    * to the specified list. This item is included!
    */
    void subTreeToList(QList< MessageItem * > &list);

    //
    // Colors and fonts shared by all message items.
    // textColor() and font() will take the message status into account and return
    // one of these.
    // Call these setters only once when reading the colors from the config file.
    //
    static void setUnreadMessageColor(const QColor &color);
    static void setImportantMessageColor(const QColor &color);
    static void setToDoMessageColor(const QColor &color);
    static void setGeneralFont(const QFont &font);
    static void setUnreadMessageFont(const QFont &font);
    static void setImportantMessageFont(const QFont &font);
    static void setToDoMessageFont(const QFont &font);

protected:
    explicit MessageItem(MessageItemPrivate *dd);
private:
    const QFont &font() const;

    QString accessibleTextForField(Theme::ContentItem::Type field);

    Q_DECLARE_PRIVATE(MessageItem)
};

class FakeItemPrivate;

/// A message item that can have a fake tag list and a fake annotation
class FakeItem : public MessageItem
{
public:

    explicit FakeItem();
    ~FakeItem();

    /// Reimplemented to return the fake tag list
    QList< Tag * > tagList() const Q_DECL_OVERRIDE;

    /// Sets a list of fake tags for this item
    void setFakeTags(const QList< Tag * > &tagList);

    /// Reimplemented to always return true
    bool hasAnnotation() const Q_DECL_OVERRIDE;

private:
    Q_DECLARE_PRIVATE(FakeItem)
};

} // namespace Core

} // namespace MessageList

#endif //!__MESSAGELIST_CORE_MESSAGEITEM_H__
