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#include "qfxlineedit.h"
#include "qfxlineedit_p.h"
#include <QValidator>
#include <QApplication>
#include <QFontMetrics>
#include <QPainter>

QT_BEGIN_NAMESPACE
QML_DEFINE_TYPE(Qt,4,6,(QT_VERSION&0x00ff00)>>8,LineEdit,QFxLineEdit);
QML_DEFINE_TYPE(Qt,4,6,(QT_VERSION&0x00ff00)>>8,QIntValidator,QIntValidator);

/*!
    \qmlclass LineEdit
    \brief The LineEdit item allows you to add an editable line of text to a scene.
*/
QFxLineEdit::QFxLineEdit(QFxItem* parent)
    : QFxPaintedItem(*(new QFxLineEditPrivate), parent)
{
    Q_D(QFxLineEdit);
    d->init();
}

/*
   \internal
*/
QFxLineEdit::QFxLineEdit(QFxLineEditPrivate &dd, QFxItem* parent)
    : QFxPaintedItem(dd, parent)
{
    Q_D(QFxLineEdit);
    d->init();
}

QFxLineEdit::~QFxLineEdit()
{
}

/*!
    \qmlproperty string LineEdit::text

    The text in the LineEdit.
*/

QString QFxLineEdit::text() const
{
    Q_D(const QFxLineEdit);
    return d->control->text();
}

void QFxLineEdit::setText(const QString &s)
{
    Q_D(QFxLineEdit);
    if(s == text())
        return;
    d->control->setText(s);
    //emit textChanged();
}

/*!
    \qmlproperty font LineEdit::font

    Set the LineEdit's font attributes.  \c font.size sets the font's point size.
*/
QmlFont *QFxLineEdit::font()
{
    Q_D(QFxLineEdit);
    return d->font;
}

/*!
This signal is emitted when the font of the item changes.
*/
void QFxLineEdit::fontChanged()
{
    Q_D(QFxLineEdit);
    d->control->setFont(d->font->font());
    if(d->cursorItem){
        d->cursorItem->setHeight(QFontMetrics(d->font->font()).height());
        moveCursor();
    }
    //updateSize();
    updateAll();//TODO: Only necessary updates
    emit update();
}

/*!
    \qmlproperty color LineEdit::color

    The text color.
*/
QColor QFxLineEdit::color() const
{
    Q_D(const QFxLineEdit);
    return d->color;
}

void QFxLineEdit::setColor(const QColor &c)
{
    Q_D(QFxLineEdit);
    d->color = c;
}


/*!
    \qmlproperty color LineEdit::highlightColor

    The text highlight color, used behind selections.
*/

/*!
    \property QFxLineEdit::highlightColor
    \brief the line edit's default text highlight color
*/
QColor QFxLineEdit::highlightColor() const
{
    Q_D(const QFxLineEdit);
    return d->highlightColor;
}

void QFxLineEdit::setHighlightColor(const QColor &color)
{
    Q_D(QFxLineEdit);
    if (d->highlightColor == color)
        return;

    d->highlightColor = color;
    //TODO: implement
}

/*!
    \qmlproperty color LineEdit::highlightedTextColor

    The highlighted text color, used in selections.
*/

/*!
    \property QFxLineEdit::highlightedTextColor
    \brief the line edit's default highlighted text color
*/
QColor QFxLineEdit::highlightedTextColor() const
{
    Q_D(const QFxLineEdit);
    return d->highlightedTextColor;
}

void QFxLineEdit::setHighlightedTextColor(const QColor &color)
{
    Q_D(QFxLineEdit);
    if (d->highlightedTextColor == color)
        return;

    d->highlightedTextColor = color;
    //TODO: implement
}

QFxLineEdit::HAlignment QFxLineEdit::hAlign() const
{
    Q_D(const QFxLineEdit);
    return d->hAlign;
}

void QFxLineEdit::setHAlign(HAlignment align)
{
    Q_D(QFxLineEdit);
    d->hAlign = align;
}

bool QFxLineEdit::isReadOnly() const
{
    Q_D(const QFxLineEdit);
    return d->control->isReadOnly();
}

void QFxLineEdit::setReadOnly(bool ro)
{
    Q_D(QFxLineEdit);
    d->control->setReadOnly(ro);
}

int QFxLineEdit::maxLength() const
{
    Q_D(const QFxLineEdit);
    return d->control->maxLength();
}

void QFxLineEdit::setMaxLength(int ml)
{
    Q_D(QFxLineEdit);
    d->control->setMaxLength(ml);
}

/*!
    \qmlproperty LineEdit::cursorVisible
    \brief If true the text edit shows a cursor.

    This property is set and unset when the line edit gets focus, but it can also
    be set directly (useful, for example, if a KeyProxy might forward keys to it).
*/
bool QFxLineEdit::isCursorVisible() const
{
    Q_D(const QFxLineEdit);
    return d->cursorVisible;
}

void QFxLineEdit::setCursorVisible(bool on)
{
    Q_D(QFxLineEdit);
    if (d->cursorVisible == on)
        return;
    d->cursorVisible = on;
    d->control->setCursorBlinkPeriod(on?QApplication::cursorFlashTime():0);
    updateAll();//TODO: Only update cursor rect
}

/*!
    \qmlproperty LineEdit::cursorPosition
    \brief The position of the cursor in the LineEdit.
*/
int QFxLineEdit::cursorPosition() const
{
    Q_D(const QFxLineEdit);
    return d->control->cursor();
}
void QFxLineEdit::setCursorPosition(int cp)
{
    Q_D(QFxLineEdit);
    d->control->moveCursor(cp);
}

/*!
    \qmlproperty int LineEdit::selectionStart

    The cursor position before the first character in the current selection.
    Setting this and selectionEnd allows you to specify a selection in the
    text edit.

    Note that if selectionStart == selectionEnd then there is no current
    selection. If you attempt to set selectionStart to a value outside of
    the current text, selectionStart will not be changed.

    \sa selectionEnd, cursorPosition, selectedText
*/
int QFxLineEdit::selectionStart() const
{
    Q_D(const QFxLineEdit);
    return d->lastSelectionStart;
}

void QFxLineEdit::setSelectionStart(int s)
{
    Q_D(QFxLineEdit);
    if(d->lastSelectionStart == s || s < 0 || s > text().length())
        return;
    d->lastSelectionStart = s;
    d->control->setSelection(s, d->lastSelectionEnd - s);
}

/*!
    \qmlproperty int LineEdit::selectionEnd

    The cursor position after the last character in the current selection.
    Setting this and selectionStart allows you to specify a selection in the
    text edit.

    Note that if selectionStart == selectionEnd then there is no current
    selection. If you attempt to set selectionEnd to a value outside of
    the current text, selectionEnd will not be changed.

    \sa selectionStart, cursorPosition, selectedText
*/
int QFxLineEdit::selectionEnd() const
{
    Q_D(const QFxLineEdit);
    return d->lastSelectionEnd;
}

void QFxLineEdit::setSelectionEnd(int s)
{
    Q_D(QFxLineEdit);
    if(d->lastSelectionEnd == s || s < 0 || s > text().length())
        return;
    d->lastSelectionEnd = s;
    d->control->setSelection(d->lastSelectionStart, s - d->lastSelectionStart);
}

QString QFxLineEdit::selectedText() const
{
    Q_D(const QFxLineEdit);
    return d->control->selectedText();
}

QObject* QFxLineEdit::validator() const
{
    Q_D(const QFxLineEdit);
    //###const cast isn't good, but needed for property system?
    //###same should be said about using QObject* as the property type
    return const_cast<QValidator*>(d->control->validator());
}

void QFxLineEdit::setValidator(QObject* v)
{
    Q_D(QFxLineEdit);
    QValidator* valid = qobject_cast<QValidator*>(v);
    if(!valid)
        return;
    d->control->setValidator(valid);
    if(!d->control->hasAcceptableInput()){
        d->oldValidity = false;
        emit acceptableInputChanged();
    }
}

QString QFxLineEdit::inputMask() const
{
    Q_D(const QFxLineEdit);
    return d->control->inputMask();
}

void QFxLineEdit::setInputMask(const QString &im)
{
    Q_D(QFxLineEdit);
    d->control->setInputMask(im);
}

bool QFxLineEdit::hasAcceptableInput() const
{
    Q_D(const QFxLineEdit);
    return d->control->hasAcceptableInput();
}

uint QFxLineEdit::echoMode() const
{
    Q_D(const QFxLineEdit);
    return d->control->echoMode();
}

void QFxLineEdit::setEchoMode(uint echo)
{
    Q_D(QFxLineEdit);
    d->control->setEchoMode(echo);
}

/*!
    \qmlproperty LineEdit::cursorDelegate
    \brief The delegate for the cursor in the LineEdit.

    If you set a cursorDelegate for a LineEdit, this delegate will be used for
    drawing the cursor instead of the standard cursor. An instance of the
    delegate will be created and managed by the LineEdit when a cursor is
    needed, and the x property of delegate instance will be set so as
    to be one pixel before the top left of the current character.

    Note that the root item of the delegate component must be a QFxItem or
    QFxItem derived item.
*/
QmlComponent* QFxLineEdit::cursorDelegate() const
{
    Q_D(const QFxLineEdit);
    return d->cursorComponent;
}

void QFxLineEdit::setCursorDelegate(QmlComponent* c)
{
    Q_D(QFxLineEdit);
    if(d->cursorComponent)
        delete d->cursorComponent;
    d->cursorComponent = c;
    d->startCreatingCursor();
}

void QFxLineEditPrivate::startCreatingCursor()
{
    Q_Q(QFxLineEdit);
    if(!cursorComponent){
        q->disconnect(control, SIGNAL(cursorPositionChanged(int, int)),
                q, SLOT(moveCursor()));
        return;
    }
    q->connect(control, SIGNAL(cursorPositionChanged(int, int)),
            q, SLOT(moveCursor()));
    if(cursorComponent->isReady()){
        q->createCursor();
    }else if(cursorComponent->isLoading()){
        q->connect(cursorComponent, SIGNAL(statusChanged(int)),
                q, SLOT(createCursor()));
    }else{//isError
        qWarning() << "You could really use the error checking for QFxLineEdit. We'll implement it soon.";
    }
}

void QFxLineEdit::createCursor()
{
    Q_D(QFxLineEdit);
    //Handle isError too
    if(!d->cursorComponent->isReady())
        return;

    if(d->cursorItem)
        delete d->cursorItem;
    d->cursorItem = qobject_cast<QFxItem*>(d->cursorComponent->create());
    if(!d->cursorItem){
        qWarning() << "You could really use the error reporting for QFxLineEdit. We'll implement it soon.";
        return;
    }

    d->cursorItem->setParentItem(this);
    d->cursorItem->setX(d->control->cursorToX());
    d->cursorItem->setHeight(d->control->height());
}

void QFxLineEdit::moveCursor()
{
    Q_D(QFxLineEdit);
    if(!d->cursorItem)
        return;
    d->cursorItem->setX(d->control->cursorToX() - d->hscroll);
}

int QFxLineEdit::xToPos(int x)
{
    Q_D(const QFxLineEdit);
    return d->control->xToPos(x - d->hscroll);
}

void QFxLineEdit::focusChanged(bool hasFocus)
{
    Q_D(QFxLineEdit);
    d->focused = hasFocus;
    setCursorVisible(hasFocus);
}

void QFxLineEdit::keyPressEvent(QKeyEvent* ev)
{
    Q_D(QFxLineEdit);
    d->control->processKeyEvent(ev);
}

void QFxLineEdit::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    Q_D(QFxLineEdit);
    setFocus(true);//###Should we make 'focusOnPress' be optional like TextEdit?
    setCursorVisible(true);
    d->focused = true;
    d->control->processEvent(event);
    //event->accept();
}

bool QFxLineEdit::event(QEvent* ev)
{
    Q_D(QFxLineEdit);
    //Anything we don't deal with ourselves, pass to the control
    switch(ev->type()){
        case QEvent::GraphicsSceneMousePress:
            break;
        default:
            return d->control->processEvent(ev);
    }
    return false;
}

void QFxLineEdit::geometryChanged(const QRectF &newGeometry,
                                  const QRectF &oldGeometry)
{
    if (newGeometry.width() != oldGeometry.width())
        updateSize();
    QFxPaintedItem::geometryChanged(newGeometry, oldGeometry);
}

void QFxLineEdit::drawContents(QPainter *p, const QRect &r)
{
    Q_D(QFxLineEdit);
    p->setRenderHint(QPainter::TextAntialiasing, true);
    p->save();
    p->setPen(QPen(d->color));
    int flags = QLineControl::DrawText;
    if(!isReadOnly() && d->cursorVisible && !d->cursorItem)
        flags |= QLineControl::DrawCursor;
    if (d->control->hasSelectedText())
            flags |= QLineControl::DrawSelections;

    d->control->draw(p, QPoint(0,0), r, flags);

    p->restore();
}

/*!
    \qmlproperty bool LineEdit::smooth

    Set this property if you want the text to be smoothly scaled or
    transformed.  Smooth filtering gives better visual quality, but is slower.  If
    the item is displayed at its natural size, this property has no visual or
    performance effect.

    \note Generally scaling artifacts are only visible if the item is stationary on
    the screen.  A common pattern when animating an item is to disable smooth
    filtering at the beginning of the animation and reenable it at the conclusion.
*/

void QFxLineEditPrivate::init()
{
        Q_Q(QFxLineEdit);
        control->setCursorWidth(1);
        control->setPasswordCharacter(QLatin1Char('*'));
        control->setLayoutDirection(Qt::LeftToRight);
        q->setSmoothTransform(smooth);
        q->setAcceptedMouseButtons(Qt::LeftButton);
        q->setFlag(QGraphicsItem::ItemHasNoContents, false);
        q->setFlag(QGraphicsItem::ItemAcceptsInputMethod);
        q->connect(control, SIGNAL(cursorPositionChanged(int,int)),
                q, SLOT(cursorPosChanged()));
        q->connect(control, SIGNAL(selectionChanged()),
                q, SLOT(selectionChanged()));
        q->connect(control, SIGNAL(textChanged(const QString &)),
                q, SLOT(q_textChanged()));
        q->connect(control, SIGNAL(accepted()),
                q, SIGNAL(accepted()));
        q->connect(control, SIGNAL(updateNeeded(const QRect &)),
        //        q, SLOT(dirtyCache(const QRect &)));
                q, SLOT(updateAll()));
        q->connect(control, SIGNAL(cursorPositionChanged(int,int)),
                q, SLOT(updateAll()));
        q->connect(control, SIGNAL(selectionChanged()),
                q, SLOT(updateAll()));
        if(!font)
            font = new QmlFont();
        q->connect(font, SIGNAL(updated()), q, SLOT(fontChanged()));
        q->updateSize();
        oldValidity = control->hasAcceptableInput();
        lastSelectionStart = 0;
        lastSelectionEnd = 0;
}

void QFxLineEdit::cursorPosChanged()
{
    Q_D(QFxLineEdit);
    emit cursorPositionChanged();

    if(!d->control->hasSelectedText()){
        if(d->lastSelectionStart != d->control->cursor()){
            d->lastSelectionStart = d->control->cursor();
            emit selectionStartChanged();
        }
        if(d->lastSelectionEnd != d->control->cursor()){
            d->lastSelectionEnd = d->control->cursor();
            emit selectionEndChanged();
        }
    }
}

void QFxLineEdit::selectionChanged()
{
    Q_D(QFxLineEdit);
    emit selectedTextChanged();

    if(d->lastSelectionStart != d->control->selectionStart()){
        d->lastSelectionStart = d->control->selectionStart();
        if(d->lastSelectionStart == -1)
            d->lastSelectionStart = d->control->cursor();
        emit selectionStartChanged();
    }
    if(d->lastSelectionEnd != d->control->selectionEnd()){
        d->lastSelectionEnd = d->control->selectionEnd();
        if(d->lastSelectionEnd == -1)
            d->lastSelectionEnd = d->control->cursor();
        emit selectionEndChanged();
    }
}

void QFxLineEdit::q_textChanged()
{
    Q_D(QFxLineEdit);
    updateAll();
    emit textChanged();
    if(hasAcceptableInput() != d->oldValidity){
        d->oldValidity = hasAcceptableInput();
        emit acceptableInputChanged();
    }
}

//### Please replace this function with proper updating
void QFxLineEdit::updateAll()
{
    clearCache();
    updateSize();
    update();
}

void QFxLineEdit::updateSize()
{
    Q_D(QFxLineEdit);
    setImplicitHeight(d->control->height());
    //d->control->width() is max width, not current width
    QFontMetrics fm = QFontMetrics(d->font->font());
    setImplicitWidth(fm.boundingRect(d->control->text()).width()+1);
    setContentsSize(QSize(width(), height()));
}

QT_END_NAMESPACE