/****************************************************************************

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** contained in the Technology Preview License Agreement accompanying

** this package.

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****************************************************************************/

#include "attachmentlistwidget.h"

#include <QStringListModel>

#include <QListView>

#include <QVBoxLayout>

#include <QLabel>

#include <QDebug>

#include <QMessageBox>

#include <QDialogButtonBox>

#include <QTreeView>

#include <QFileInfo>

#include <QItemDelegate>

#include <QPainter>

#include <QPointer>

#include <QMouseEvent>

#include <QHeaderView>

//#include <support/qmailnamespace.h>

class AttachmentListWidget;

static QString sizeString(uint size)

{

    if(size < 1024)

        return QObject::tr("%n byte(s)", "", size);

    else if(size < (1024 * 1024))

        return QObject::tr("%1 KB").arg(((float)size)/1024.0, 0, 'f', 1);

    else if(size < (1024 * 1024 * 1024))

        return QObject::tr("%1 MB").arg(((float)size)/(1024.0 * 1024.0), 0, 'f', 1);

    else

        return QObject::tr("%1 GB").arg(((float)size)/(1024.0 * 1024.0 * 1024.0), 0, 'f', 1);

}

static QStringList headers(QStringList() << "Attachment" << "Size" << "Type" << "");

class AttachmentListHeader : public QHeaderView

{

    Q_OBJECT

public:

    AttachmentListHeader(AttachmentListWidget* parent);

signals:

    void clear();

protected:

    void paintSection(QPainter * painter, const QRect & rect, int logicalIndex) const;

#ifndef QT_NO_CURSOR    

    bool viewportEvent(QEvent* e);

    void mouseMoveEvent(QMouseEvent* e);

#endif    

    void mousePressEvent(QMouseEvent* e);

    bool overRemoveLink(QMouseEvent* e);

private:

    AttachmentListWidget* m_parent;

    mutable QRect m_removeButtonRect;

};

AttachmentListHeader::AttachmentListHeader(AttachmentListWidget* parent)

:

QHeaderView(Qt::Horizontal,parent),

m_parent(parent)

{

}

void AttachmentListHeader::paintSection(QPainter * painter, const QRect & rect, int logicalIndex) const

{

    if(logicalIndex == 3 && m_parent->attachments().count() > 1)

    {

        painter->save();

        QFont font = painter->font();

        font.setUnderline(true);

        painter->setFont(font);

        painter->drawText(rect,Qt::AlignHCenter | Qt::AlignVCenter,"Remove All",&m_removeButtonRect);

        painter->restore();

    }

    else

        QHeaderView::paintSection(painter,rect,logicalIndex);

}

#ifndef QT_NO_CURSOR    

bool AttachmentListHeader::viewportEvent(QEvent* e)

{

    if(e->type() == QEvent::Leave)

        setCursor(QCursor());

    return QAbstractItemView::viewportEvent(e);

}

void AttachmentListHeader::mouseMoveEvent(QMouseEvent* e)

{

    QHeaderView::mouseMoveEvent(e);

    if(overRemoveLink(e))

    {

        QCursor handCursor(Qt::PointingHandCursor);

        setCursor(handCursor);

    }

    else if(cursor().shape() == Qt::PointingHandCursor)

        setCursor(QCursor());

}

#endif

void AttachmentListHeader::mousePressEvent(QMouseEvent* e)

{

    if(overRemoveLink(e))

        emit clear();

    QHeaderView::mousePressEvent(e);

}

bool AttachmentListHeader::overRemoveLink(QMouseEvent* e)

{

    return m_removeButtonRect.contains(e->pos());

}

class AttachmentListDelegate : public QItemDelegate

{

    Q_OBJECT

public:

    AttachmentListDelegate(AttachmentListWidget* parent = 0);

    void paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const;

    bool isOverRemoveLink(const QRect& parentRect, const QPoint& pos) const;

protected slots:

    bool helpEvent(QHelpEvent * event, QAbstractItemView * view, const QStyleOptionViewItem & option, const QModelIndex & index);

private:

    QPointer<AttachmentListWidget> m_parent;

};

AttachmentListDelegate::AttachmentListDelegate(AttachmentListWidget* parent)

:

QItemDelegate(parent),

m_parent(parent)

{

}

void AttachmentListDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const

{

    if(index.isValid() && index.column() == 3)

    {

        painter->save();

        QFont font = painter->font();

        QColor c = option.palette.brush(QPalette::Link).color();

        font.setUnderline(true);

        painter->setPen(c);

        painter->setFont(font);

        painter->drawText(option.rect,Qt::AlignHCenter,"Remove");

        painter->restore();

    }

    else

        QItemDelegate::paint(painter,option,index);

}

bool AttachmentListDelegate::isOverRemoveLink(const QRect& parentRect, const QPoint& pos) const

{

    QFont font;

    font.setUnderline(true);

    QFontMetrics fm(font);

    QRect textRect = fm.boundingRect(parentRect,Qt::AlignHCenter,"Remove");

    return textRect.contains(pos);

}

bool AttachmentListDelegate::helpEvent(QHelpEvent *, QAbstractItemView *view, const QStyleOptionViewItem &, const QModelIndex &index)

{

    if (!index.isValid()) {

        view->setToolTip(QString());

        return false;

    }

    QString attachment = m_parent->attachmentAt(index.row());

    view->setToolTip(attachment);

    return false;

}

class AttachmentListView : public QTreeView

{

    Q_OBJECT

public:

    AttachmentListView(QWidget* parent = 0);

signals:

    void removeAttachmentAtIndex(int index);

protected:

#ifndef QT_NO_CURSOR    

    bool viewportEvent(QEvent* e);

    void mouseMoveEvent(QMouseEvent* e);

#endif    

    void mousePressEvent(QMouseEvent* e);

    bool overRemoveLink(QMouseEvent* e);

};

AttachmentListView::AttachmentListView(QWidget* parent)

:

QTreeView(parent)

{

    setMouseTracking(true);

    installEventFilter(this);

}

#ifndef QT_NO_CURSOR    

bool AttachmentListView::viewportEvent(QEvent* e)

{

    if(e->type() == QEvent::Leave)

        setCursor(QCursor());

    return QAbstractItemView::viewportEvent(e);

}

void AttachmentListView::mouseMoveEvent(QMouseEvent* e)

{

    if(overRemoveLink(e))

    {

        QCursor handCursor(Qt::PointingHandCursor);

        setCursor(handCursor);

    }

    else if(cursor().shape() == Qt::PointingHandCursor)

        setCursor(QCursor());

    QTreeView::mouseMoveEvent(e);

}

#endif

void AttachmentListView::mousePressEvent(QMouseEvent* e)

{

    if(overRemoveLink(e))

    {

        QModelIndex index = indexAt(e->pos());

        emit removeAttachmentAtIndex(index.row());

    }

    QTreeView::mousePressEvent(e);

}

bool AttachmentListView::overRemoveLink(QMouseEvent* e)

{

    QModelIndex index = indexAt(e->pos());

    if(index.isValid() && index.column() == 3)

    {

        AttachmentListDelegate* delegate = static_cast<AttachmentListDelegate*>(itemDelegate());

        return delegate->isOverRemoveLink(visualRect(index),e->pos());

    }

    return false;

}

class AttachmentListModel : public QAbstractListModel

{

public:

    AttachmentListModel(QWidget* parent );

    QVariant headerData(int section,Qt::Orientation orientation, int role = Qt::DisplayRole ) const;

    bool isEmpty() const;

    int columnCount(const QModelIndex & parent = QModelIndex()) const;

    int rowCount(const QModelIndex & parent = QModelIndex()) const;

    QVariant data ( const QModelIndex & index, int role = Qt::DisplayRole ) const;

    QStringList attachments() const;

    void setAttachments(const QStringList& attachments);

private:

    QStringList m_attachments;

};

AttachmentListModel::AttachmentListModel(QWidget* parent)

:

QAbstractListModel(parent)

{

}

QVariant AttachmentListModel::headerData(int section, Qt::Orientation o, int role) const

{

    if (role == Qt::DisplayRole)

    {

        if(section < headers.count())

            return headers.at(section);

    }

   return QAbstractListModel::headerData(section,o,role);

}

bool AttachmentListModel::isEmpty() const

{

    return m_attachments.isEmpty();

}

int AttachmentListModel::columnCount(const QModelIndex & parent ) const

{

    Q_UNUSED(parent);

    return headers.count();

}

int AttachmentListModel::rowCount(const QModelIndex& parent) const

{

    Q_UNUSED(parent);

    return m_attachments.count();

}

QVariant AttachmentListModel::data( const QModelIndex & index, int role) const

{

    if(index.isValid())

    {

        if(role == Qt::DisplayRole && index.isValid())

        {

            QString path = m_attachments.at(index.row());

            QFileInfo fi(path);

            switch(index.column())

            {

            case 0:

                return fi.fileName();

                break;

            case 1:

                return sizeString(fi.size());

                break;

            case 2:

                //QString mimeType = QMail::mimeTypeFromFileName(path);

                //if(mimeType.isEmpty()) mimeType = "Unknown";

                //return mimeType;

                return "Unknown";

                break;

            }

        }

        else if((role == Qt::DecorationRole  || role == Qt::CheckStateRole )&& index.column() > 0)

            return QVariant();

            else if(role == Qt::DecorationRole)

        {

            static QIcon attachIcon( ":icon/attach" );

            return attachIcon;

        }

    }

    return QVariant();

}

QStringList AttachmentListModel::attachments() const

{

    return m_attachments;

}

void AttachmentListModel::setAttachments(const QStringList& attachments)

{

    m_attachments.clear();

    foreach (const QString &att, attachments) {

        if (!att.startsWith("ref:") && !att.startsWith("partRef:")) {

            m_attachments.append(att);

        }

    }

    reset();

}

AttachmentListWidget::AttachmentListWidget(QWidget* parent)

:

QWidget(parent),

m_listView(new AttachmentListView(this)),

m_model(new AttachmentListModel(this)),

m_delegate(new AttachmentListDelegate(this)),

m_clearLink(new QLabel(this))

{

    m_clearLink->setTextInteractionFlags(Qt::LinksAccessibleByMouse);

    m_clearLink->setTextFormat(Qt::RichText);

    m_listView->setModel(m_model);

    m_listView->setSelectionMode(QAbstractItemView::NoSelection);

    AttachmentListHeader* header = new AttachmentListHeader(this);

    connect(header,SIGNAL(clear()),this,SLOT(clearClicked()));

    m_listView->setHeader(header);

    m_listView->header()->setStretchLastSection(true);

    m_listView->header()->setResizeMode(QHeaderView::ResizeToContents);

    m_listView->header()->setDefaultSectionSize(180);

    m_listView->setUniformRowHeights(true);

    m_listView->setRootIsDecorated(false);

    m_listView->setItemDelegate(m_delegate);

    QVBoxLayout* layout = new QVBoxLayout(this);

    layout->setSpacing(0);

    layout->setContentsMargins(0,0,0,0);

    layout->addWidget(m_listView);

    connect(m_clearLink,SIGNAL(linkActivated(QString)),this,SLOT(clearClicked()));

    connect(m_listView,SIGNAL(removeAttachmentAtIndex(int)),this,SLOT(removeAttachmentAtIndex(int)));

}

QStringList AttachmentListWidget::attachments() const

{

    return m_attachments;

}

QString AttachmentListWidget::attachmentAt(int index) const

{

    return m_attachments.at(index);

}

int AttachmentListWidget::count() const

{

    return m_attachments.count();

}

bool AttachmentListWidget::isEmpty() const

{

    return m_attachments.isEmpty();

}

void AttachmentListWidget::addAttachment(const QString& attachment)

{

    if(m_attachments.contains(attachment))

        return;

    m_attachments.append(attachment);

    m_model->setAttachments(m_attachments);

    setVisible(!m_model->isEmpty());

    emit attachmentsAdded(QStringList() << attachment);

}

void AttachmentListWidget::addAttachments(const QStringList& attachments)

{

    QSet<QString> newAttachments = attachments.toSet() - m_attachments.toSet();

    if (!newAttachments.isEmpty()) {

        m_attachments += newAttachments.toList();

        m_model->setAttachments(m_attachments);

        setVisible(!m_model->isEmpty());

        emit attachmentsAdded(newAttachments.toList());

    }

}

void AttachmentListWidget::removeAttachment(const QString& attachment)

{

    if (!m_attachments.contains(attachment))

        return;

    m_attachments.removeAll(attachment);

    m_model->setAttachments(m_attachments);

    setVisible(!m_model->isEmpty());

    emit attachmentsRemoved(attachment);

}

void AttachmentListWidget::clear()

{

    m_attachments.clear();

    m_model->setAttachments(m_attachments);

    setVisible(false);

}

void AttachmentListWidget::clearClicked()

{

    if(QMessageBox::question(this,

                             "Remove attachments",

                             QString("Remove %1 attachments?").arg(m_attachments.count()),

                             QMessageBox::Yes | QMessageBox::No) == QMessageBox::Yes)

        clear();

}

void AttachmentListWidget::removeAttachmentAtIndex(int index)

{

    if(index >= m_attachments.count())

        return;

    QString attachment = m_attachments.at(index);

    m_attachments.removeAt(index);

    m_model->setAttachments(m_attachments);

    setVisible(!m_model->isEmpty());

    emit attachmentsRemoved(attachment);

}

#include <attachmentlistwidget.moc>