#include "ULineEditMenu.h"

#include <QPainter>
#include <QResizeEvent>
#include <QApplication>

#include "ULineEdit.h"

namespace
{
    const QStringList MENU_LIST = QStringList() << "Clear" << "Copy" << "Paste";
    const QSize Menu_SIZE = QSize(126, 40);
    const int TRIANGLE_WIDTH = 5;
    const int TRIANGLE_HEIGHT = 5;
}

ULineEditMenu* ULineEditMenu::getInstance()
{
    static ULineEditMenu instance;
    return &instance;
}

ULineEditMenu::ULineEditMenu(QWidget* aParent)
    : QWidget(aParent)
    , mMenuList(new QListWidget(this))
    , mCurrentEdit(nullptr)
{
    setObjectName("EditMenu");
    setGeometry(0, 0, Menu_SIZE.width(), Menu_SIZE.height());
    setAttribute(Qt::WA_TranslucentBackground, true);
    setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::Tool | Qt::WindowDoesNotAcceptFocus);
    initializeMenuList();
    connect(mMenuList, &QListWidget::itemClicked, this, &ULineEditMenu::handleMenuItemClicked);
    connect(qApp, &QApplication::aboutToQuit, [this]()
        {
            hide();
        });
}

ULineEditMenu::~ULineEditMenu()
{
}

void ULineEditMenu::initializeMenuList()
{
    mMenuList->addItems(MENU_LIST);
    mMenuList->setViewMode(QListView::ListMode);
    mMenuList->setFlow(QListView::LeftToRight);
    mMenuList->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    mMenuList->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    mMenuList->setHorizontalScrollMode(QListWidget::ScrollPerPixel);
  //  QString qss = "QListWidget::Item:hover { background: #006dc7; color: white; }"
 //       "QListWidget {background:qlineargradient(spread:pad, x1:0.50, y1:0, x2:0.5, y2:1, stop:0 #505050, stop:1 #606060);font: 10pt; outline: none; border:1px solid #00000000; color: white; }";
  //  mMenuList->setStyleSheet(qss);
}

void ULineEditMenu::resizeEvent(QResizeEvent* aEvent)
{
    if (nullptr == aEvent)
    {
        return;
    }
    QSize size = aEvent->size();
    mMenuList->setGeometry(5, 5, size.width() - 10, size.height() - 15);
}

void ULineEditMenu::paintEvent(QPaintEvent* aEvent)
{
    QPainter painter(this);
    QLinearGradient linearGradient(0.5, 0, 0.5, 1);
    linearGradient.setColorAt(0, "#505050");
    linearGradient.setColorAt(1, "#606060");

    QBrush brush(linearGradient);
    painter.setBrush(brush);
    painter.setPen(Qt::NoPen);

    QRect rect = geometry();
    int w = rect.width();
    int h = rect.height();

    QPolygon triangle;
    triangle.setPoints(3, w / 2, h - 1, w / 2 - TRIANGLE_WIDTH, h - TRIANGLE_HEIGHT, w / 2 + TRIANGLE_WIDTH, h - TRIANGLE_HEIGHT);
    painter.drawRoundedRect(0, 0, w - 1, h - TRIANGLE_HEIGHT, 5, 5);
    painter.drawPolygon(triangle);

    QWidget::paintEvent(aEvent);
}

void ULineEditMenu::handleMenuItemClicked(QListWidgetItem* aItem)
{
    QLineEdit* edit = qobject_cast<QLineEdit*>(mCurrentEdit);
    if (nullptr == aItem || nullptr == edit)
    {
        return;
    }
    aItem->setSelected(false);
    if (MENU_LIST.at(0) == aItem->text())
    {
        edit->clear();
    }
    else if (MENU_LIST.at(1) == aItem->text())
    {
        edit->copy();
    }
    else if (MENU_LIST.at(2) == aItem->text())
    {
        edit->paste();
    }
    hide();
}

void ULineEditMenu::setCurrentEdit(QWidget* aEdit)
{
    mCurrentEdit = aEdit;
}