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#include "widget.h"

#include "ui_widget.h"

#include <QGraphicsOpacityEffect>

#include <QPropertyAnimation>

Widget::Widget(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Widget),

    previousSelectionCount(0)

{

    ui->setupUi(this);

    effect = new QGraphicsOpacityEffect;

    effect->setOpacity(0.3);

    ui->groupBox->setGraphicsEffect(effect);

    fadeIn = new QPropertyAnimation(effect, "opacity");

    fadeIn->setDuration(200);

    fadeIn->setStartValue(0.3);

    fadeIn->setEndValue(1.);

    fadeOut = new QPropertyAnimation(effect, "opacity");

    fadeOut->setDuration(200);

    fadeOut->setStartValue(1.);

    fadeOut->setEndValue(0.3);

    scene = new CustomScene;

    scene->setSceneRect(-250,-250,500,500);

    ui->view->setScene(scene);

    scene->setBackgroundBrush(Qt::white);

    ui->view->setInteractive(true);

    ui->view->setDragMode(QGraphicsView::RubberBandDrag);

    ui->view->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);

    ui->view->setRenderHints( QPainter::SmoothPixmapTransform |

                              QPainter::TextAntialiasing |

                              QPainter::Antialiasing );

    rectBlue = new CustomItem(-100, -100, 50, 50, QColor(80, 80, 200));

    scene->addItem(rectBlue);

    rectGreen = new CustomItem(100, -100, 50, 50, QColor(80, 200, 80));

    scene->addItem(rectGreen);

    rectRed = new CustomItem(-100, 100, 50, 50, QColor(200, 80, 80));

    scene->addItem(rectRed);

    rectYellow = new CustomItem(100, 100, 50, 50, QColor(200, 200, 20));

    scene->addItem(rectYellow);

    connect(scene, SIGNAL(selectionChanged()), this, SLOT(onSceneSelectionChanged()));

}

Widget::~Widget()

{

    delete ui;

    delete fadeIn;

    delete fadeOut;

}

void Widget::on_rotate_valueChanged(int value)

{

    if (scene->selectedItems().count() != 1)

        return;

    QGraphicsItem *item = scene->selectedItems().at(0);

    item->setRotation(value);

    ui->rotateItem->setValue(checkedItem()->rotation());

}

void Widget::on_scale_valueChanged(int value)

{

    if (scene->selectedItems().count() != 1)

        return;

    QGraphicsItem *item = scene->selectedItems().at(0);

    item->setScale(value / 10.);

    ui->scaleItem->setValue(checkedItem()->scale() * 10);

}

void Widget::on_rotateItem_valueChanged(int value)

{

    if (!scene->selectedItems().empty() && scene->selectedItems().at(0) == checkedItem())

        ui->rotate->setValue(value);

    else

        checkedItem()->setRotation(value);

}

void Widget::on_scaleItem_valueChanged(int value)

{

    if (!scene->selectedItems().empty() && scene->selectedItems().at(0) == checkedItem())

        ui->scale->setValue(value);

    else

        checkedItem()->setScale(value / 10.);

}

void Widget::on_group_clicked()

{

    QList<QGraphicsItem*> all = scene->selectedItems();

    if (all.size() < 2)

        return;

    QList<CustomItem*> items = scene->selectedCustomItems();

    QList<CustomGroup*> groups = scene->selectedCustomGroups();

    if (groups.size() == 1) {

        foreach (CustomItem *item, items) {

            item->setSelected(false);

            groups[0]->addToGroup(item);

        }

        return;

    }

    CustomGroup* group = new CustomGroup;

    scene->addItem(group);

    foreach (QGraphicsItem *item, all) {

        item->setSelected(false);

        group->addToGroup(item);

    }

    group->setSelected(true);

    updateUngroupButton();

}

void Widget::on_dismantle_clicked()

{

    QList<CustomGroup*> groups = scene->selectedCustomGroups();

    foreach (CustomGroup *group, groups) {

        foreach (QGraphicsItem *item, group->childItems())

            group->removeFromGroup(item);

        delete group;

    }

    updateUngroupButton();

}

void Widget::on_merge_clicked()

{

    QList<CustomGroup*> groups = scene->selectedCustomGroups();

    if (groups.size() < 2)

        return;

    CustomGroup *newBigGroup = groups.takeFirst();

    foreach (CustomGroup *group, groups) {

        foreach (QGraphicsItem *item, group->childItems())

            item->setGroup(newBigGroup);

        delete group;

    }

}

void Widget::onSceneSelectionChanged()

{

    QList<QGraphicsItem*> all = scene->selectedItems();

    QList<CustomGroup*> groups = scene->selectedCustomGroups();

    if (all.empty() && all.count() != previousSelectionCount) {

        fadeOut->start();

    } else if (previousSelectionCount == 0) {

        fadeIn->start();

    }

    if (all.count() == 1) {

        QGraphicsItem *item = all.at(0);

        ui->rotate->setValue(item->rotation());

        ui->scale->setValue(item->scale() * 10);

    } else {

        ui->rotate->setValue(ui->rotate->minimum());

        ui->scale->setValue(ui->scale->minimum());

    }

    ui->rotate->setEnabled(all.size() == 1);

    ui->scale->setEnabled(all.size() == 1);

    ui->group->setEnabled(all.size() > 1);

    ui->dismantle->setEnabled(!groups.empty());

    ui->merge->setEnabled(groups.size() > 1);

    previousSelectionCount = all.size();

    updateUngroupButton();

}

void Widget::on_ungroup_clicked()

{

    QGraphicsItemGroup *oldGroup = checkedItem()->group();

    checkedItem()->setGroup(0);

    if (oldGroup && oldGroup->childItems().empty())

        delete oldGroup;

    updateUngroupButton();

}

void Widget::updateUngroupButton()

{

    ui->ungroup->setEnabled(checkedItem()->group() != 0);

}

CustomItem * Widget::checkedItem() const

{

    CustomItem *item;

    if (ui->blue->isChecked())

        item = rectBlue;

    else if (ui->red->isChecked())

        item = rectRed;

    else if (ui->green->isChecked())

        item = rectGreen;

    else if (ui->yellow->isChecked())

        item = rectYellow;

    return item;

}

void Widget::on_buttonGroup_buttonClicked()

{

    ui->rotateItem->setValue(checkedItem()->rotation());

    ui->scaleItem->setValue(checkedItem()->scale() * 10);

    updateUngroupButton();

}