/*
 *   Bespin style for Qt4
 *   Copyright 2007-2012 by Thomas Lübking <thomas.luebking@gmail.com>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2
 *
 *   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.
 */

#ifdef WIN32
#define _USE_MATH_DEFINES
#include <math.h>
#else
#include <cmath>
#endif
#include "animator/hovercomplex.h"
#include "draw.h"

void
Style::drawSliderHandle(const QRect &handle, const QStyleOption *option, QPainter *painter, int step) const
{
    OPT_SUNKEN OPT_ENABLED OPT_FOCUS
    bool fullHover = config.scroll.fullHover && !config.btn.backLightHover;

    // shadow
    QPoint xy = handle.topLeft();
    if (step && config.btn.backLightHover)
        fillWithMask(painter, xy, Colors::mid(FCOLOR(Window), CCOLOR(scroll._, Fg), 6-step, step), lights.slider);
    if (sunken)
        xy += QPoint(F(1), 0);
    painter->drawPixmap(xy, shadows.slider[isEnabled][sunken]);

    // gradient
    xy += QPoint(sunken ? F(1) : F(2), F(1));

    QColor bc = hasFocus ? FCOLOR(Highlight) : CCOLOR(scroll._, Bg);
    if (fullHover)
        bc = Colors::mid(bc, CCOLOR(scroll._, Fg), 6-step, step);

    const QPixmap &fill = Gradients::pix(bc, masks.slider.height(), Qt::Vertical, isEnabled ? GRAD(scroll) : Gradients::None);
    fillWithMask(painter, xy, fill, masks.slider);
    if (!fullHover && isEnabled)
    {
        const QColor fc = Colors::mid(bc, hasFocus ? FCOLOR(HighlightedText) : CCOLOR(scroll._, Fg), 6-step, step+3);
        const QSize d = (masks.slider.size() - masks.notch.size())/2;
        xy += QPoint(d.width(), d.height());
        fillWithMask(painter, xy, fc, masks.notch);
    }
}

void
Style::drawSlider(const QStyleOptionComplex *option, QPainter *painter, const QWidget *widget) const
{
    ASSURE_OPTION(slider, Slider);

    OPT_SUNKEN OPT_ENABLED OPT_HOVER

    if (isEnabled && slider->subControls & SC_SliderTickmarks)
    {
        int ticks = slider->tickPosition;
        if (ticks != QSlider::NoTicks)
        {
            int available = pixelMetric(PM_SliderSpaceAvailable, slider, widget);
            int interval = slider->tickInterval;
            if (interval < 1) interval = slider->pageStep;
            if (interval)
            {
//             const int thickness = pixelMetric(PM_SliderControlThickness, slider, widget);
                const int len =
                pixelMetric(PM_SliderLength, slider, widget);
                const int fudge = len / 2;
                int pos, v = slider->minimum, nextInterval;
                // Since there is no subrect for tickmarks do a translation here.
                painter->save();
                painter->translate(RECT.x(), RECT.y());

#define DRAW_TICKS(_X1_, _Y1_, _X2_, _Y2_) \
while (v <= slider->maximum) { \
    pos = sliderPositionFromValue(slider->minimum, slider->maximum, v, available) + fudge;\
    painter->drawLine(_X1_, _Y1_, _X2_, _Y2_);\
    nextInterval = v + interval;\
    if (nextInterval < v) break;\
    v = nextInterval; \
} // skip semicolon

                painter->setPen(Colors::mid(BGCOLOR, FGCOLOR, 3,1));
                if (slider->orientation == Qt::Horizontal)
                {
                    const int y = RECT.height()/2;
                    if (ticks == QSlider::TicksAbove)
                        { DRAW_TICKS(pos, 0, pos, y); }
                    else if (ticks == QSlider::TicksBelow)
                        { DRAW_TICKS(pos, y, pos, RECT.height()); }
                    else
                        { DRAW_TICKS(pos, RECT.y(), pos, RECT.height()); }
                }
                else
                {
                    const int x = RECT.width()/2;
                    if (ticks == QSlider::TicksAbove)
                        { DRAW_TICKS(0, pos, x, pos); }
                    else if (ticks == QSlider::TicksBelow)
                        { DRAW_TICKS(x, pos, RECT.width(), pos); }
                    else
                        { DRAW_TICKS(0, pos, RECT.width(), pos); }
                }
                painter->restore();
            }
        }
    }

    QRect groove = subControlRect(CC_Slider, slider, SC_SliderGroove, widget);
    QRect handle = subControlRect(CC_Slider, slider, SC_SliderHandle, widget);

    isEnabled = isEnabled && (slider->maximum > slider->minimum);
    hover = isEnabled && (appType == GTK || (hover && (slider->activeSubControls & SC_SliderHandle)));
    sunken = sunken && (slider->activeSubControls & SC_SliderHandle);
//    const int ground = 0;

    // groove
    if ((slider->subControls & SC_SliderGroove) && groove.isValid())
    {
        QStyleOption grooveOpt = *option;
        grooveOpt.rect = groove;

        const Groove::Mode gType = config.scroll.groove;
        if (gType)
            config.scroll.groove = Groove::Groove;
        drawScrollBarGroove(&grooveOpt, painter, widget);
        config.scroll.groove = gType;

#if 1
        // thermometer, #2
        if (slider->minimum > -1 && (slider->maximum - slider->minimum) > 20 &&
            slider->sliderPosition != slider->minimum)
        {
            SAVE_PEN;
            bool hadAntiAlias = painter->testRenderHint(QPainter::Antialiasing);
            painter->setRenderHint( QPainter::Antialiasing, gType );
            painter->setPen(QPen(CCOLOR(scroll._, Fg), gType ? F(3) : F(1), Qt::SolidLine, Qt::RoundCap));
            if ( slider->orientation == Qt::Horizontal )
            {
                const int y = groove.center().y() + (gType ? 1 : 0);
                bool ltr = slider->direction == Qt::LeftToRight;
                if (slider->upsideDown) ltr = !ltr;
                const int x2 = ltr ? groove.left() + F(5) : groove.right() - F(5);
                painter->drawLine(handle.center().x(), y, x2, y);
            }
            else
            {
                const int x = groove.center().x();
                const int y2 = slider->upsideDown ? groove.bottom() - F(5) : groove.top() + F(5);
                painter->drawLine(x, handle.center().y(), x, y2);
            }
            painter->setRenderHint( QPainter::Antialiasing, hadAntiAlias );
            RESTORE_PEN;
        }
#endif
    }

//    int direction = 0;
//    if (slider->orientation == Qt::Vertical)
//       ++direction;

    // handle ======================================
    if (slider->subControls & SC_SliderHandle)
    {
        int step = 0;
        if (sunken)
            step = 6;
        else if (isEnabled)
        {
            const Animator::ComplexInfo *info = Animator::HoverComplex::info(widget, slider->activeSubControls & SC_SliderHandle);
            if (info && ( info->fades[Animator::In] & SC_SliderHandle || info->fades[Animator::Out] & SC_SliderHandle ))
                step = info->step(SC_SliderHandle);
            if (hover && !step)
                step = 6;
        }

        drawSliderHandle(handle, option, painter, step);
    }
}

void
Style::drawDial(const QStyleOptionComplex *option, QPainter *painter, const QWidget *) const
{
    ASSURE_OPTION(dial, Slider);

    OPT_ENABLED OPT_HOVER OPT_FOCUS

    painter->save();
    QRect rect = RECT;
    if (rect.width() > rect.height())
    {
        rect.setLeft(rect.x()+(rect.width()-rect.height())/2);
        rect.setWidth(rect.height());
    }
    else
    {
        rect.setTop(rect.y()+(rect.height()-rect.width())/2);
        rect.setHeight(rect.width());
    }

    int d = qMin(2*rect.width()/5, Dpi::target.SliderThickness);
    int r;
    // angle calculation from qcommonstyle.cpp (c) Trolltech 1992-2007, ASA.
    float a;
    if (dial->maximum == dial->minimum)
        a = M_PI / 2;
    else if (dial->dialWrapping)
        a = M_PI * 3 / 2 - (dial->sliderValue - dial->minimum) * 2 * M_PI /
                                                                (dial->maximum - dial->minimum);
    else
        a = (M_PI * 8 - (dial->sliderValue - dial->minimum) * 10 * M_PI /
                                                                (dial->maximum - dial->minimum)) / 6;

    QPoint cp = rect.center();

    // fallback for small dials ============================
    bool small(rect.width() < 8*Dpi::target.SliderThickness/3);
    if ( small )
    {
        painter->setRenderHint( QPainter::Antialiasing );
        painter->setPen(Qt::NoPen);
        painter->setBrush(QColor(0,0,0,50));
        painter->drawEllipse(rect);
        rect.adjust(F(2), F(1), -F(2), -F(2));
        painter->setBrushOrigin(rect.topLeft());
        const QPixmap &fill = Gradients::pix(FCOLOR(Window), rect.height(), Qt::Vertical, GRAD(scroll));
        painter->setBrush(fill);
        painter->drawEllipse(rect);
        QColor c = hasFocus ? FCOLOR(Highlight) : FCOLOR(WindowText);
        if (!hover)
            c = Colors::mid(FCOLOR(Window), c, 1, 1+isEnabled);
        d = qMax(F(3), d/4);
        r = (rect.width()-d)/2;
        cp += QPoint((int)(r * cos(a)), -(int)(r * sin(a)));
        painter->setPen(QPen(c, d, Qt::SolidLine, Qt::RoundCap));
        painter->drawPoint(cp);
    }

    // the value ==============================================
    QFont fnt = painter->font();
    int h = rect.height()/2;
    h -= 2 * (h - qMin(h, painter->fontMetrics().xHeight())) / 3;
    fnt.setPixelSize( h );
    painter->setFont(fnt);
    painter->setBrush(Qt::NoBrush);
    painter->setPen(Colors::mid(PAL.background().color(), PAL.foreground().color(),!hasFocus,2));
    drawItemText(painter, rect,  Qt::AlignCenter, PAL, isEnabled, QString::number(dial->sliderValue));

    if (small)
        { painter->restore(); return; }

    r = (rect.width()-d)/2;
    cp += QPoint((int)(r * cos(a)), -(int)(r * sin(a)));

    // the huge ring =======================================
    r = d/2; rect.adjust(r,r,-r,-r);
    painter->setPen(FCOLOR(Window).dark(115));
    painter->setRenderHint( QPainter::Antialiasing );
    painter->drawEllipse(rect);
    rect.translate(0, 1);
    painter->setPen(FCOLOR(Window).light(108));
    painter->drawEllipse(rect);

    // the drop ===========================
    rect = QRect(0,0,d,d);
    rect.moveCenter(cp);
    drawSliderHandle(rect, option, painter, hover * 6);

    painter->restore();
}