#include "idropshadowable.h"
#include "dropshadowmgr.h"
#include "../ImageBlur/imageblur.h"
#include "PaintHelper/painthelper.h"
#include <QDebug>

/**
 * @brief IDropShadowable::IDropShadowable
 * @param selfWidget 阴影显示在这一层上
 */
IDropShadowable::IDropShadowable(QWidget *selfWidget)
    : m_pSelfWidget(selfWidget)
{
    selfWidget->installEventFilter(DropShadowMgr::Instance());
}
/**
 * @brief IDropShadowable::SetDropShadow
 * @param boxShadow
 * @param size 这个是阴影上面内容的大小
 */
void IDropShadowable::SetDropShadow(const BoxShadow &boxShadow, const QSize &size)
{
    /* 直接清除list，这单例阴影只能用在一个地方？ */
    ClearDropShadow();
    DropShadowMgr::sm_cacheShadows.clear();
    m_listShadows.append(boxShadow);
    if(!DropShadowMgr::sm_cacheShadows.contains(boxShadow))
    {
        /* 一边阴影的宽度 */
        int radius = boxShadow.radius;
        /* 图片（阴影？）宽和高 */
        int imageWidth = size.width()+radius*2;
        int imageHeight = size.height()+radius*2;
        QImage image(imageWidth, imageHeight, QImage::Format_ARGB32);
        image.fill(boxShadow.color);
        //边框设为透明
        for(int x=0;x<image.width();x++)
        {
            for(int y=0;y<image.height();y++)
            {
                /* 设置阴影圈部分透明 */
                if(x>=radius && x<(image.width()-radius) && y>=radius && y<(image.height()-radius)) continue;
                image.setPixelColor(QPoint(x,y), Qt::transparent);
            }
        }
        /* 通过高斯模糊来设置阴影 */
        GaussBlur::Blur(image, boxShadow.radius);
        /* 又创建一个？ */
        BoxShadow shadow_image(boxShadow);
        shadow_image.image = image;
        DropShadowMgr::sm_cacheShadows.append(shadow_image);
    }
    m_pSelfWidget->update();
}

void IDropShadowable::SetDropShadows(const QList<BoxShadow> &shadows, const QSize &size)
{
    Q_UNUSED(shadows)
    Q_UNUSED(size)
    //找到最大的radius, x偏移, y偏移
    return;
}

void IDropShadowable::ClearDropShadow()
{
    m_listShadows.clear();
    m_pSelfWidget->update();
}
/**
 * @brief 绘制阴影
 */
void IDropShadowable::PaintShadows()
{
    PainterEx painter(m_pSelfWidget);
    painter.setRenderHint(QPainter::Antialiasing);
    for(const BoxShadow &boxShadow: m_listShadows)
    {
        int index = DropShadowMgr::sm_cacheShadows.indexOf(boxShadow);
        if(index == -1) continue;
        QImage image = DropShadowMgr::sm_cacheShadows.at(index).image;
        painter.drawImage(image.rect(), image, image.rect());
    }
}