#include "TrackDelegate.h"
#include <QPainter>

TrackDelegate::TrackDelegate(QObject *parent)
    : QStyledItemDelegate(parent) {}

QSize TrackDelegate::sizeHint(const QStyleOptionViewItem &, const QModelIndex &) const {
    return {0, 42};   // fixed row height
}

void TrackDelegate::paint(QPainter *p, const QStyleOptionViewItem &opt,
                          const QModelIndex &idx) const
{
    p->save();

    bool selected = opt.state & QStyle::State_Selected;
    bool current  = idx.data(Qt::UserRole + 1).toBool();  // is-playing flag
    QColor bg = selected
                    ? opt.palette.highlight().color()
                    : (idx.row() % 2 == 0
                           ? opt.palette.base().color()
                           : opt.palette.alternateBase().color());
    p->fillRect(opt.rect, bg);

    if (current) {
        QColor accent = opt.palette.highlight().color();
        p->fillRect(opt.rect.left(), opt.rect.top(), 3, opt.rect.height(), accent);
    }

    QColor fg  = selected ? opt.palette.highlightedText().color()
                          : opt.palette.text().color();
    QColor dim = selected ? fg : fg.lighter(160);

    int pad = current ? 10 : 7;
    QRect r  = opt.rect.adjusted(pad, 2, -6, -2);
    int   mid = r.top() + r.height() / 2;

    QFont fTop = opt.font;
    fTop.setBold(true);
    fTop.setPointSizeF(10);
    p->setFont(fTop);
    p->setPen(fg);
    QString title = idx.data(Qt::DisplayRole).toString();
    p->drawText(r.left(), r.top(), r.width(), mid - r.top(),
                Qt::AlignLeft | Qt::AlignVCenter | Qt::TextSingleLine, title);

    QFont fBot = opt.font;
    fBot.setPointSizeF(8.5);
    p->setFont(fBot);
    p->setPen(dim);
    QString sub = idx.data(Qt::UserRole).toString();
    p->drawText(r.left(), mid, r.width(), r.bottom() - mid,
                Qt::AlignLeft | Qt::AlignVCenter | Qt::TextSingleLine, sub);

    p->restore();
}