#include "InputModeMenu.h"
#include "ui_InputModeMenu.h"

#include <QListWidget>
#include <QResizeEvent>
#include <QPainter>

namespace
{
    const QStringList INPUT_MODE_LIST = QStringList() << "En" << "PinYin" << "HandWrite";
    const QSize MENU_SIZE = QSize(143,148);
    const int TRIANGLE_WIDTH = 10;
    const int TRIANGLE_HEIGHT = 10;
    const int TRIANGLE_WIDTHOFFSEt = -50;
}

InputModeMenu::InputModeMenu(QWidget *aParent)
    : QWidget(aParent)
    , mMenuList(new QListWidget(this))
{
    setAttribute(Qt::WA_TranslucentBackground, true);
    setGeometry(0,0,MENU_SIZE.width(),MENU_SIZE.height());
    connect(mMenuList,&QListWidget::itemClicked,this,&InputModeMenu::switchInputMode);
    initializeInputModeList();
    setWindowFlags( Qt::FramelessWindowHint |Qt::WindowStaysOnTopHint | Qt::Tool | Qt::WindowDoesNotAcceptFocus | Qt::BypassWindowManagerHint);
}

InputModeMenu::~InputModeMenu()
{
    delete mMenuList;
}

void InputModeMenu::initializeInputModeList()
{
    mMenuList->addItems(INPUT_MODE_LIST);
}

void InputModeMenu::resizeEvent(QResizeEvent *aEvent)
{
    if (nullptr == aEvent)
    {
        return;
    }
    QSize size = aEvent->size();
    mMenuList->setGeometry(5,5,size.width()-10,size.height()-20);

    for(int i=0;i<mMenuList->count();++i)
    {
        mMenuList->item(i)->setSizeHint(QSize(mMenuList->size().width()-2,mMenuList->size().height()/INPUT_MODE_LIST.count() -2));
    }
}

void InputModeMenu::paintEvent(QPaintEvent *aEvent)
{
    QPainter painter(this);
    QLinearGradient linearGradient(0.5, 0, 0.5, 1);
    linearGradient.setColorAt(0, "#f7f7f7");
    linearGradient.setColorAt(1, "#ffffff");

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

    QWidget::paintEvent(aEvent);
}

void InputModeMenu::setCurrentInputMode(InputMode aInputMode)
{
    switch (aInputMode)
    {
    case InputMode::LowMode:
        mMenuList->setCurrentRow(0);
        break;
    case InputMode::ChineseMode:
        mMenuList->setCurrentRow(1);
        break;
    case InputMode::HandWriteMode:
        mMenuList->setCurrentRow(2);
        break;
    default:
        mMenuList->setCurrentRow(0);
        break;
    }
}

void InputModeMenu::switchInputMode(QListWidgetItem* aItem)
{
    if (nullptr == aItem)
    {
        return ;
    }

    if ( INPUT_MODE_LIST.at(0) == aItem->text())
    {
        emit inputModeSelected(InputMode::LowMode);
    }
    else if(INPUT_MODE_LIST.at(1) == aItem->text())
    {
        emit inputModeSelected(InputMode::ChineseMode);
    }
    else if(INPUT_MODE_LIST.at(2) == aItem->text())
    {
        emit inputModeSelected(InputMode::HandWriteMode);
    }
}