#include "BaseWgt.h"
#include <QHoverEvent>
#include <QApplication>
#include <QDesktopWidget>
#include <QDebug>
#include <QDir>

enum MouseStyle{ NORMAL, RIGHT, BOTTOMRIGHT, BOTTOM } mouseStyle;

BaseWgt::BaseWgt(QWidget *parent)
    : QWidget(parent)
    , m_bResizable(true)
    , m_iMarginWidth(6)
    , m_bPressed(false)
    , m_ptPressPos(0, 0)
    , m_bIsMaxState(false)
{
    //this->setAttribute(Qt::WA_TranslucentBackground);
    this->setWindowFlags(Qt::FramelessWindowHint | Qt::Window);

    this->initUiControl();
    this->initSignalSlotConn();

    this->setAttribute(Qt::WA_Hover);
    this->installEventFilter(this);
}

BaseWgt::~BaseWgt()
{

}

bool BaseWgt::eventFilter(QObject *obj, QEvent *event)
{
    if (obj != this && obj != m_pTopWgt)
    {
        return false;
    }
    switch(event->type())
    {
    case QEvent::MouseMove:
        {
            QMouseEvent *mouseEvent = dynamic_cast<QMouseEvent *>(event);
            if (m_bPressed && mouseStyle == NORMAL && NULL != mouseEvent)
            {
                //如果是最大化，则先恢复正常状态
                if (m_bIsMaxState)
                {
                    QPoint pt = this->mapFromGlobal(QCursor::pos());
                    int iMaxWidth = this->width();

                    m_bIsMaxState = !m_bIsMaxState;
                    this->resize(m_normalRect.size());
                    m_pMaxBtn->setProperty("maxState", false);
                    m_pMaxBtn->setToolTip("最大化");

                    QStyle *pStyle = this->style();
                    pStyle->unpolish(m_pMaxBtn);
                    pStyle->polish(m_pMaxBtn);

                    m_ptPressPos.setY(pt.y());
                    m_ptPressPos.setX(pt.x() * (this->width() - 100) / (iMaxWidth - 100));
                }
                this->move(this->mapToGlobal(mouseEvent->pos()) - m_ptPressPos);
                return true;
            }
            break;
        }
    //[1]鼠标在界面上移动
    case QEvent::HoverMove:
    {
        QHoverEvent *hoverEvent = dynamic_cast<QHoverEvent *>(event);
        if (m_bPressed)
        {
            //只能在界面右边或者右下角缩放界面
            QPoint ptGlobalPos = this->mapToGlobal(hoverEvent->pos());
            QPoint ptTopLeft = this->frameGeometry().topLeft();
            QPoint ptBottomRight = this->frameGeometry().bottomRight();
            switch(mouseStyle)
            {
            case BOTTOM:
            if (ptGlobalPos.y() - ptTopLeft.y() > this->minimumHeight())
            {
                ptBottomRight.setY(ptGlobalPos.y());
            }
            else
            {
                ptBottomRight.setY(ptTopLeft.y() + this->minimumHeight());
            }
            break;

            case RIGHT:
                if (ptGlobalPos.x() - ptTopLeft.x() > this->minimumWidth())
                {
                    ptBottomRight.setX(ptGlobalPos.x());
                }
                else
                {
                    ptBottomRight.setX(ptTopLeft.x() + this->minimumWidth());
                }
                break;


            case BOTTOMRIGHT:
                if (ptGlobalPos.y() - ptTopLeft.y() > this->minimumHeight())
                {
                    ptBottomRight.setY(ptGlobalPos.y());
                }
                else
                {
                    ptBottomRight.setY(ptTopLeft.y() + this->minimumHeight());
                }
                if (ptGlobalPos.x() - ptTopLeft.x() > this->minimumWidth())
                {
                    ptBottomRight.setX(ptGlobalPos.x());
                }
                else
                {
                    ptBottomRight.setX(ptTopLeft.x() + this->minimumWidth());
                }
                break;
            }
            this->setGeometry(QRect(ptTopLeft, ptBottomRight));
            return true;
        }
        else
        {
            changeMouseStyle(hoverEvent->pos());
        }
    }
    break;
    //[1]end 鼠标在界面上移动

    //[2]鼠标按下
    case QEvent::MouseButtonPress:
    {
        //在顶部/右方边缘/右下角时，鼠标按下时做标记
        QMouseEvent *mouseEvent = dynamic_cast<QMouseEvent *>(event);
        if (mouseEvent->button() == Qt::LeftButton)
        {
            if (mouseEvent->pos().y() <= TOP_HEIGHT | mouseStyle != NORMAL)
            {
                qDebug()<<"pressed in";
                m_bPressed = true;
                m_ptPressPos = mouseEvent->globalPos() - this->frameGeometry().topLeft();
            }
        }
    }
    break;
    //[2]end 鼠标按下

    //[3]鼠标左键松开
    case QEvent::MouseButtonRelease:
    {
        QMouseEvent *mouseEvent = dynamic_cast<QMouseEvent *>(event);
        if (mouseEvent->button() == Qt::LeftButton)
        {
            qDebug()<<"release in";
            m_bPressed = false;
            changeMouseStyle(mouseEvent->pos());
        }
    }
    break;
    //[3]end 鼠标左键松开

    //[4]鼠标双击
    case QEvent::MouseButtonDblClick:
    {
        QMouseEvent *mouseEvent = dynamic_cast<QMouseEvent *>(event);
        if (mouseEvent->button() == Qt::LeftButton && mouseEvent->pos().y() <= TOP_HEIGHT)
        {
            qDebug()<<"dbc in";
            maximumBtnClickedSlot();
            return true;
        }
    }
    break;
    //[4]鼠标双击

    case QEvent::Show:
    {
        repaint();
    }

    default:
        break;
    }
    return false;
}

void BaseWgt::changeMouseStyle(const QPoint &ptMousePos)
{
    if (!m_bResizable)
    {
        setCursor(Qt::ArrowCursor);//正常样式
        mouseStyle = NORMAL;
        return;
    }
    if (m_bIsMaxState)
    {
        setCursor(Qt::ArrowCursor);//正常样式
        mouseStyle = NORMAL;
        return;
    }
    int iPosX = ptMousePos.x();
    int iPosY = ptMousePos.y();
    int iWidth = this->width();
    int iHeight = this->height();

    if (iPosX >= iWidth - m_iMarginWidth && iPosX <= iWidth)
    {
        if (iPosY >= iHeight - m_iMarginWidth && iPosY <= iHeight)
        {
            setCursor(Qt::SizeFDiagCursor);//右下
            mouseStyle = BOTTOMRIGHT;
            return;
        }
        setCursor(Qt::SizeHorCursor);
        mouseStyle = RIGHT;//右
        return;
    }
    if (iPosY >= iHeight - m_iMarginWidth && iPosY <= iHeight)
    {
        setCursor(Qt::SizeVerCursor);//下
        mouseStyle = BOTTOM;
        return;
    }
    setCursor(Qt::ArrowCursor);
    mouseStyle = NORMAL;
    return;
}

//[4]设置是否可以伸缩
void BaseWgt::setResizable(bool bResizable)
{
    m_bResizable = bResizable;
}
//[4]end 设置是否可以伸缩

//[5]设置鼠标样式在界面边缘改变的范围
void BaseWgt::setMargin(const int &iMargin)
{
    m_iMarginWidth = iMargin;
}

//[5]end 设置鼠标样式在界面边缘改变的范围

void BaseWgt::initUiControl()
{
    //设置使程序支持中文字符
    QTextCodec *codec = QTextCodec::codecForName("System");	// 获取系统编码
    QTextCodec::setCodecForLocale(codec);
//	QTextCodec::setCodecForCStrings(codec);
//	QTextCodec::setCodecForTr(codec);

    QDesktopWidget*pDeskTop = QApplication::desktop();
    if(pDeskTop->screenCount() >= 2)
    {
        m_screenRect = pDeskTop->screenGeometry(pDeskTop->primaryScreen() == 0?1:0);
    }
    else
    {
        m_screenRect = pDeskTop->availableGeometry();//保存屏幕大小
    }



    m_pBottomWgt = new QWidget(this);
    m_pBottomWgt->setObjectName("m_pBottomWgt");

    QVBoxLayout *pVBoxLayoutBottom = new QVBoxLayout(this);
    pVBoxLayoutBottom->setMargin(0);
    pVBoxLayoutBottom->setSpacing(0);
    pVBoxLayoutBottom->addWidget(m_pBottomWgt);



    m_pTopWgt = new QWidget(this);
    m_pTopWgt->installEventFilter(this);
    m_pTopWgt->setObjectName("m_pTopWgt");
    m_pTopWgt->setMinimumHeight(TOP_HEIGHT);
    m_pTopWgt->setMaximumHeight(TOP_HEIGHT);
    //m_pTopWgt->setAttribute(Qt::WA_Hover);

    m_pMainWgt = new QWidget(this);
    m_pMainWgt->setObjectName("m_pMainWgt");

    QVBoxLayout *pVBoxLayout = new QVBoxLayout(m_pBottomWgt);
    pVBoxLayout->setMargin(0);
    pVBoxLayout->setSpacing(0);
    pVBoxLayout->addWidget(m_pTopWgt);
    pVBoxLayout->addWidget(m_pMainWgt);

    m_pIconLabel = new QLabel(this);
    m_pTitleLbl = new QLabel(this);
    m_pMinBtn = new QPushButton(this);
    m_pMaxBtn = new QPushButton(this);
    m_pCloseBtn = new QPushButton(this);
    m_pIconLabel->setMinimumSize(20, 20);
    m_pIconLabel->setMaximumSize(20, 20);
    m_pMinBtn->setMinimumSize(27, 22);
    m_pMinBtn->setMaximumSize(27, 22);
    m_pMaxBtn->setMinimumSize(27, 22);
    m_pMaxBtn->setMaximumSize(27, 22);
    m_pCloseBtn->setMinimumSize(42, 22);
    m_pCloseBtn->setMaximumSize(42, 22);
    m_pMinBtn->setToolTip("最小化");
    m_pMaxBtn->setToolTip("最大化");
    m_pCloseBtn->setToolTip("关闭");
    m_pIconLabel->setObjectName("m_pIconLabel");
    m_pTitleLbl->setObjectName("m_pTitleLbl");
    m_pMinBtn->setObjectName("m_pMinBtn");
    m_pMaxBtn->setObjectName("m_pMaxBtn");
    m_pCloseBtn->setObjectName("m_pCloseBtn");

    QHBoxLayout *pHBoxLayout = new QHBoxLayout;
    pHBoxLayout->setContentsMargins(8, 2, 2, 2);
    pHBoxLayout->setSpacing(1);
    pHBoxLayout->addWidget(m_pIconLabel);
    pHBoxLayout->addSpacing(5);
    pHBoxLayout->addWidget(m_pTitleLbl);
    pHBoxLayout->addStretch();
    pHBoxLayout->addWidget(m_pMinBtn);
    pHBoxLayout->addWidget(m_pMaxBtn);
    pHBoxLayout->addWidget(m_pCloseBtn);
    m_pTopWgt->setLayout(pHBoxLayout);

    //载入样式表
    QFile file(WGT_STYLE_PATH);
    if (file.open(QIODevice::ReadOnly))
    {
        QString strSheet = file.readAll();
        setStyleSheet(strSheet);
    }
}

//初始化信号槽连接
void BaseWgt::initSignalSlotConn()
{
    connect(m_pMinBtn, SIGNAL(clicked()), this, SLOT(minimumBtnClickedSlot()));
    connect(m_pMaxBtn, SIGNAL(clicked()), this, SLOT(maximumBtnClickedSlot()));
    connect(m_pCloseBtn, SIGNAL(clicked()), this, SLOT(close()));
}


//最小化按钮单击槽函数
void BaseWgt::minimumBtnClickedSlot()
{
    showMinimized();
}

//最大化按钮单击槽函数
void BaseWgt::maximumBtnClickedSlot()
{
    m_bIsMaxState = !m_bIsMaxState;
    if (m_bIsMaxState)
    {
        //记录下正常窗口的状态
        m_normalRect.setTopLeft(this->frameGeometry().topLeft());
        m_normalRect.setSize(this->size());

        this->setGeometry(m_screenRect);
        m_pMaxBtn->setProperty("maxState", true);
        m_pMaxBtn->setToolTip("restore");
    }
    else
    {
        this->setGeometry(m_normalRect);
        m_pMaxBtn->setProperty("maxState", false);
        m_pMaxBtn->setToolTip("最大化");
    }
    QStyle *pStyle = this->style();
    pStyle->unpolish(m_pMaxBtn);
    pStyle->polish(m_pMaxBtn);
}

void BaseWgt::setSysIcon(const QString &url)
{
    qDebug()<<QDir::currentPath();
    QPixmap *pixmap = new QPixmap(url);
    m_pTitleLbl->setPixmap(*pixmap);
}

//设置窗口标题
void BaseWgt::setWindowTitle(const QString &strTitle)
{
    m_pTitleLbl->setText(strTitle);
    m_pTitleLbl->setFixedSize(m_pTitleLbl->sizeHint());
    m_pTitleLbl->setFixedHeight(22);
}

void BaseWgt::hideTopWgt()
{
    m_pTopWgt->hide();
}

void BaseWgt::setTopWgtHiddent(bool bHide)
{
    if(bHide)
    {
        m_pTopWgt->hide();
    }
    else
    {
        m_pTopWgt->show();
    }
}

void BaseWgt::setCloseBtnVisible(bool bVisible)
{
    if(!m_pCloseBtn) return;
    m_pCloseBtn->setVisible(bVisible);
}