/* ============================================================
 *
 * This file is a part of kipi-plugins project
 * http://www.digikam.org
 *
 * Date        : 2011-09-01
 * Description : a plugin to create photo layouts by fusion of several images.
 * Acknowledge : based on the expoblending plugin
 *
 * Copyright (C) 2011 by Łukasz Spas <lukasz dot spas at gmail dot com>
 * Copyright (C) 2009-2011 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * 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, 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.
 *
 * ============================================================ */

#include "ToolsDockWidget.moc"
#include "CanvasEditTool.h"
#include "EffectsEditorTool.h"
#include "TextEditorTool.h"
#include "BorderEditTool.h"
#include "ZoomTool.h"

#include <QDebug>
#include <QButtonGroup>
#include <QGridLayout>
#include <QPropertyAnimation>
#include <QScrollArea>

#include <QIcon>
#include <kguiitem.h>
#include <klocalizedstring.h>

using namespace KIPIPhotoLayoutsEditor;

class ToolsDockWidget::ToolsDockWidgetPrivate
{
    ToolsDockWidgetPrivate() :
        zoom_tool(0),
        canvas_tool(0),
        effects_tool(0),
        text_tool(0),
        border_tool(0),
        formLayout(0),
        toolArea(0)
    {
    }

    ZoomTool*          zoom_tool;
    CanvasEditTool*    canvas_tool;
    EffectsEditorTool* effects_tool;
    TextEditorTool*    text_tool;
    BorderEditTool*    border_tool;
    QGridLayout*       formLayout;
    QScrollArea*       toolArea;

    friend class ToolsDockWidget;
};

ToolsDockWidget * ToolsDockWidget::m_instance = 0;

class MyStackedLayout : public QStackedLayout
{
    public:

        MyStackedLayout(QWidget * parent = 0) : QStackedLayout(parent) {}

        virtual QSize sizeHint() const
        {
            QSize s = QStackedLayout::sizeHint();
            s.setHeight(this->currentWidget()->sizeHint().height());
            return s;
        }

        virtual QSize minimumSize() const
        {
            return sizeHint();
        }
};

ToolsDockWidget * ToolsDockWidget::instance(QWidget * parent)
{
    if (!m_instance)
        m_instance = new ToolsDockWidget(parent);
    return m_instance;
}

ToolsDockWidget::ToolsDockWidget(QWidget * parent) :
    QDockWidget(i18n("Tools"),parent),
//    m_has_selection(false),
    m_current_item(0),
    m_scene(0),
    d(new ToolsDockWidgetPrivate)
{
    this->setFeatures(QDockWidget::DockWidgetMovable);
    this->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);

    QWidget * widget = new QWidget(this);
    QVBoxLayout * layout = new QVBoxLayout(widget);
    //layout->setSizeConstraint(QLayout::SetMinimumSize);

    // tools buttons layout
    d->formLayout = new QGridLayout();
    //formLayout->setSizeConstraint(QLayout::SetMinimumSize);
    layout->addLayout(d->formLayout);

    // stacked widget (with tools widgets)
    d->toolArea = new QScrollArea(widget);
    //sa->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
    d->toolArea->setFrameShape(QFrame::NoFrame);
    d->toolArea->setWidgetResizable(true);
    d->toolArea->setWidget(0);
    layout->addWidget(d->toolArea,1);

    QButtonGroup * group = new QButtonGroup(widget);

    // Selection tool

    m_tool_pointer = new KPushButton(KGuiItem("",":/pointer.png",
                                              i18n("Allows to select and move images on canvas"),
                                              i18n("Tool which allows one to select and move images on canvas. Any other operations are disabled.")), widget);
    m_tool_pointer->setIconSize(QSize(24,24));
    m_tool_pointer->setFixedSize(32,32);
    m_tool_pointer->setCheckable(true);
    m_tool_pointer->setFlat(true);
    group->addButton(m_tool_pointer);
    connect(m_tool_pointer,SIGNAL(toggled(bool)),this,SLOT(setPointerToolVisible(bool)));

    // View tool
    m_tool_hand = new KPushButton(KGuiItem("",":/hand.png",
                                           i18n("Viewing tool"),
                                           i18n("This tool allows one to view whole canvas in read-only mode. Only scrolling and zooming are available.")), widget);
    m_tool_hand->setIconSize(QSize(24,24));
    m_tool_hand->setFixedSize(32,32);
    m_tool_hand->setCheckable(true);
    m_tool_hand->setFlat(true);
    group->addButton(m_tool_hand);
    connect(m_tool_hand,SIGNAL(toggled(bool)),this,SLOT(setHandToolVisible(bool)));

    // Zoom tool
    m_tool_zoom = new KPushButton(KGuiItem("",":/zoom.png",
                                           i18n("Zooming tool"),
                                           i18n("This tool allows one to zoom canvas to fit it to the application window or users preferences.")), widget);
    m_tool_zoom->setIconSize(QSize(24,24));
    m_tool_zoom->setFixedSize(32,32);
    m_tool_zoom->setCheckable(true);
    m_tool_zoom->setFlat(true);
    group->addButton(m_tool_zoom);
    connect(m_tool_zoom,SIGNAL(toggled(bool)),this,SLOT(setZoomWidgetVisible(bool)));

    // Canvas edit tool
    m_canvas_button = new KPushButton(KGuiItem("", ":/tool_canvas.png",
                                               i18n("Canvas editor"),
                                               i18n("This tool allows you to edit canvas properties like size and background.")), widget);
    m_canvas_button->setIconSize(QSize(24,24));
    m_canvas_button->setFixedSize(32,32);
    m_canvas_button->setCheckable(true);
    m_canvas_button->setFlat(true);
    group->addButton(m_canvas_button);
    connect(m_canvas_button,SIGNAL(toggled(bool)),this,SLOT(setCanvasWidgetVisible(bool)));

    // Text tool
    m_text_button = new KPushButton(KGuiItem("", ":/tool_text.png",
                                              i18n("Text editor"),
                                              i18n("This tool allows you to write text on the canvas. It's simple - just click on the canvas where you want to add some text and write it!")), widget);

    m_text_button->setIconSize(QSize(24,24));
    m_text_button->setFixedSize(32,32);
    m_text_button->setCheckable(true);
    m_text_button->setFlat(true);
    group->addButton(m_text_button);
    connect(m_text_button,SIGNAL(toggled(bool)),this,SLOT(setTextWidgetVisible(bool)));

    // Rotate tool
    m_rotate_button = new KPushButton(KGuiItem("", ":/tool_rotate.png",
                                              i18n("Rotation tool"),
                                              i18n("This tool allows you to rotate items on your canvas.")), widget);
    m_rotate_button->setIconSize(QSize(24,24));
    m_rotate_button->setFixedSize(32,32);
    m_rotate_button->setCheckable(true);
    m_rotate_button->setFlat(true);
    group->addButton(m_rotate_button);
    connect(m_rotate_button,SIGNAL(toggled(bool)),this,SLOT(setRotateWidgetVisible(bool)));

    // Scale tool
    m_scale_button = new KPushButton(KGuiItem("", ":/tool_scale4.png",
                                              i18n("Scaling tool"),
                                              i18n("This tool allows you to scale items on your canvas.")), widget);
    m_scale_button->setIconSize(QSize(24,24));
    m_scale_button->setFixedSize(32,32);
    m_scale_button->setCheckable(true);
    m_scale_button->setFlat(true);
    group->addButton(m_scale_button);
    connect(m_scale_button,SIGNAL(toggled(bool)),this,SLOT(setScaleWidgetVisible(bool)));

    // Crop tool
    m_crop_button = new KPushButton(KGuiItem("", ":/tool_cropt.png",
                                              i18n("Crop tool"),
                                              i18n("This tool allows you to crop items.")), widget);
    m_crop_button->setIconSize(QSize(24,24));
    m_crop_button->setFixedSize(32,32);
    m_crop_button->setCheckable(true);
    m_crop_button->setFlat(true);
    group->addButton(m_crop_button);
    connect(m_crop_button,SIGNAL(toggled(bool)),this,SLOT(setCropWidgetVisible(bool)));

    // Photo effects tool
    m_effects_button = new KPushButton(KGuiItem("", ":/tool_effects.png",
                                              i18n("Image effects editor"),
                                              i18n("This tool allows you to edit existing effects of your photo layers and add some new one.")), widget);
    m_effects_button->setIconSize(QSize(24,24));
    m_effects_button->setFixedSize(32,32);
    m_effects_button->setCheckable(true);
    m_effects_button->setFlat(true);
    group->addButton(m_effects_button);
    connect(m_effects_button,SIGNAL(toggled(bool)),this,SLOT(setEffectsWidgetVisible(bool)));

    // Border edit tool
    m_tool_border = new KPushButton(QIcon::fromTheme(":/tool_border.png"), "", widget);
    m_tool_border->setIconSize(QSize(24,24));
    m_tool_border->setFixedSize(32,32);
    m_tool_border->setCheckable(true);
    m_tool_border->setFlat(true);
    group->addButton(m_tool_border);
    connect(m_tool_border,SIGNAL(toggled(bool)),this,SLOT(setBordersWidgetVisible(bool)));

    // Spacer
    d->formLayout->setSpacing(0);
    d->formLayout->setMargin(0);

    layout->setSpacing(0);
    layout->setMargin(0);
    widget->setLayout(layout);
    //widget->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);
    this->setWidget(widget);
    this->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Maximum);
    this->setMinimumWidth(235);

    setDefaultTool();
}

ToolsDockWidget::~ToolsDockWidget()
{
    m_instance = 0;
    delete d;
}

void ToolsDockWidget::setDefaultTool()
{
    m_tool_hand->setChecked(true);
    this->setHandToolVisible(true);
}

void ToolsDockWidget::setScene(Scene * scene)
{
    if (scene)
        this->connect(scene, SIGNAL(destroyed()), this, SLOT(setScene()));
    if (sender() && !scene && this->m_scene)
        return;
    m_scene = scene;
    QWidget * w = d->toolArea->widget();
    AbstractTool * tool = dynamic_cast<AbstractTool*>(w);
    if (tool)
        tool->setScene(m_scene);
}

void ToolsDockWidget::itemSelected(AbstractPhoto * photo)
{
    qCDebug(KIPIPLUGINS_LOG) << "itemSelected" << (QGraphicsItem*)photo;
    m_current_item = photo;
    QWidget * w = d->toolArea->widget();
    if (!w)
        return;
    AbstractItemsTool * tool =qobject_cast<AbstractItemsTool*>(w);
    if (tool)
        tool->setCurrentItem(photo);
    qCDebug(KIPIPLUGINS_LOG) << tool;
}

void ToolsDockWidget::mousePositionChoosen(const QPointF & position)
{
    QWidget * w = d->toolArea->widget();
    if (!w)
        return;
    AbstractItemsTool * tool =qobject_cast<AbstractItemsTool*>(w);
    if (tool)
        tool->setMousePosition(position);
}

void ToolsDockWidget::emitNewItemCreated(AbstractPhoto * item)
{
    if (!item)
        return;
    emit newItemCreated(item);
}

void ToolsDockWidget::setPointerToolVisible(bool isSelected)
{
    m_tool_pointer->setChecked(isSelected);
    if (isSelected)
    {
        d->toolArea->setWidget(0);
        this->unsetCursor();
        emit requireMultiSelection();
        emit pointerToolSelected();
    }
}

void ToolsDockWidget::setHandToolVisible(bool isSelected)
{
    m_tool_hand->setChecked(isSelected);
    if (isSelected)
    {
        d->toolArea->setWidget(0);
        this->unsetCursor();
        emit requireMultiSelection();
        emit handToolSelected();
    }
}

void ToolsDockWidget::setZoomWidgetVisible(bool isVisible)
{
    if (d->zoom_tool)
    {
        d->zoom_tool->deleteLater();
        d->zoom_tool = 0;
    }
    m_tool_zoom->setChecked(isVisible);
    emit zoomToolSelectionChanged(isVisible);
    if (isVisible)
    {
        d->zoom_tool = new ZoomTool(0, d->toolArea);
        d->zoom_tool->setScene(m_scene);
        d->toolArea->setWidget(d->zoom_tool);
        emit requireSingleSelection();
        emit zoomToolSelected();
    }
}

void ToolsDockWidget::setCanvasWidgetVisible(bool isVisible)
{
    if (d->canvas_tool)
    {
        d->canvas_tool->deleteLater();
        d->canvas_tool = 0;
    }
    m_canvas_button->setChecked(isVisible);
    emit canvasToolSelectionChanged(isVisible);
    if (isVisible)
    {
        d->canvas_tool = new CanvasEditTool(0, d->toolArea);
        d->canvas_tool->setScene(m_scene);
        d->toolArea->setWidget(d->canvas_tool);
        emit requireMultiSelection();
        emit canvasToolSelected();
    }
}

void ToolsDockWidget::setEffectsWidgetVisible(bool isVisible)
{
    if (d->effects_tool)
    {
        d->effects_tool->deleteLater();
        d->effects_tool = 0;
    }
    m_effects_button->setChecked(isVisible);
    emit effectsToolSelectionChanged(isVisible);
    if (isVisible)
    {
        d->effects_tool = new EffectsEditorTool(0, d->toolArea);
        d->effects_tool->setScene(m_scene);
        d->effects_tool->setCurrentItem(m_current_item);
        d->toolArea->setWidget(d->effects_tool);
        emit requireSingleSelection();
        emit effectsToolSelected();
    }
}

void ToolsDockWidget::setTextWidgetVisible(bool isVisible)
{
    if (d->text_tool)
    {
        d->text_tool->deleteLater();
        d->text_tool = 0;
    }
    m_text_button->setChecked(isVisible);
    emit textToolSelectionChanged(isVisible);
    if (isVisible)
    {
        d->text_tool = new TextEditorTool(0, d->toolArea);
        connect(d->text_tool, SIGNAL(itemCreated(AbstractPhoto*)), this, SLOT(emitNewItemCreated(AbstractPhoto*)));
        d->text_tool->setScene(m_scene);
        d->text_tool->setCurrentItem(m_current_item);
        d->toolArea->setWidget(d->text_tool);
        emit requireSingleSelection();
        emit textToolSelected();
    }
}

void ToolsDockWidget::setRotateWidgetVisible(bool isVisible)
{
    emit rotateToolSelectionChanged(isVisible);
    m_rotate_button->setChecked(isVisible);
    if (isVisible)
    {
        d->toolArea->setWidget(0);
        emit requireSingleSelection();
        emit rotateToolSelected();
    }
}

void ToolsDockWidget::setScaleWidgetVisible(bool isVisible)
{
    emit scaleToolSelectionChanged(isVisible);
    m_scale_button->setChecked(isVisible);
    if (isVisible)
    {
        d->toolArea->setWidget(0);
        emit requireSingleSelection();
        emit scaleToolSelected();
    }
}

void ToolsDockWidget::setCropWidgetVisible(bool isVisible)
{
    emit cropToolSelectionChanged(isVisible);
    m_crop_button->setChecked(isVisible);
    if (isVisible)
    {
        d->toolArea->setWidget(0);
        emit requireSingleSelection();
        emit cropToolSelected();
    }
}

void ToolsDockWidget::setBordersWidgetVisible(bool isVisible)
{
    if (d->border_tool)
    {
        d->border_tool->deleteLater();
        d->border_tool = 0;
    }
    m_tool_border->setChecked(isVisible);
    emit borderToolSelectionChanged(isVisible);
    if (isVisible)
    {
        d->border_tool = new BorderEditTool(0, d->toolArea);
        d->border_tool->setScene(m_scene);
        d->border_tool->setCurrentItem(m_current_item);
        d->toolArea->setWidget(d->border_tool);
        emit requireSingleSelection();
        emit borderToolSelected();
    }
}

void ToolsDockWidget::resizeEvent(QResizeEvent * event)
{
    QList<QWidget*> l;
    l << m_tool_pointer
      << m_tool_hand
      << m_tool_zoom
      << m_canvas_button
      << m_text_button
      << m_rotate_button
      << m_scale_button
      << m_crop_button
      << m_effects_button
      << m_tool_border;

    foreach(QWidget* w, l)
        d->formLayout->removeWidget(w);

    int width = 0;
    int col = 0, row = 0;
    foreach(QWidget* w, l)
    {
        width += w->size().width();
        if (row < (int)(width / event->size().width()) )
        {
            d->formLayout->setColumnStretch(col, 1);
            row += 1;
            col = 0;
            width = row * event->size().width() + w->size().width();
        }
        d->formLayout->setColumnStretch(col, 0);
        d->formLayout->addWidget(w, row, col++, Qt::AlignCenter);
        d->formLayout->setRowStretch(row, 0);
    }
    if (!row)
        d->formLayout->setColumnStretch(col, 1);
}
