#include "Text_Shower.h"
#include <QPainter>
#include <QFontMetrics>
#include <algorithm>

namespace Psc {

Text_Shower::Text_Shower(QWidget* parent)
    : QWidget(parent)
{
    setAttribute(Qt::WA_TranslucentBackground);

    // 宽度交给布局，高度最小
    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);
}

void Text_Shower::set_text(const QString& text)
{
    m_text = text;
    updateGeometry();  // 通知布局重新计算
    update();
}

void Text_Shower::set_title(const QString& title)
{
    m_title = title;
    updateGeometry();
    update();
}

void Text_Shower::set_max_width(int w)
{
    m_max_width = w;
    updateGeometry();
}

bool Text_Shower::hasHeightForWidth() const
{
    return true;
}

int Text_Shower::heightForWidth(int width) const
{
    width = std::min(width, m_max_width);
    return calculate_height(width);
}

QSize Text_Shower::sizeHint() const
{
    int w = std::min(400, m_max_width);
    return QSize(w, calculate_height(w));
}

QSize Text_Shower::minimumSizeHint() const
{
    return QSize(120, 40);
}

int Text_Shower::calculate_height(int width) const
{
    QFontMetrics fm(font());

    int content_width = width - m_padding * 2;
    if (content_width <= 0)
        return 40;

    QRect textRect = fm.boundingRect(
        QRect(0, 0, content_width, 10000),
        Qt::TextWordWrap,
        m_text
    );

    int height = textRect.height();

    if (!m_title.isEmpty())
    {
        QFont titleFont = font();
        titleFont.setBold(true);
        QFontMetrics titleFm(titleFont);

        height += titleFm.height() + 6;
    }

    height += m_padding * 2;

    return height;
}

void Text_Shower::paintEvent(QPaintEvent*)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing);

    QRect r = rect();

    painter.setBrush(QColor(255,255,255));
    painter.setPen(QPen(QColor(0,0,0), 1));
    painter.drawRoundedRect(r.adjusted(0,0,-1,-1), m_radius, m_radius);

    int y = m_padding;

    if (!m_title.isEmpty())
    {
        QFont titleFont = font();
        titleFont.setBold(true);
        painter.setFont(titleFont);

        QFontMetrics titleFm(titleFont);
        painter.drawText(m_padding,
                         y + titleFm.ascent(),
                         m_title);

        y += titleFm.height() + 6;
        painter.setFont(font());
    }

    QRect textRect(m_padding, y,
                   width() - m_padding * 2,
                   height() - y - m_padding);

    painter.drawText(textRect,
                     Qt::AlignLeft | Qt::TextWordWrap,
                     m_text);
}

}