#include "card_list_widget.h"
#include <QPainter>
#include <QApplication>
#include <QVBoxLayout>

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

void CardItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option,
                           const QModelIndex& index) const
{
    painter->save();

    // 获取数据
    CardData data = index.data(Qt::UserRole).value<CardData>();
    
    // 绘制卡片背景
    QRect rect = option.rect;
    rect.adjust(5, 5, -5, -5); // 留出边距
    
    // 如果被选中，绘制不同的背景色
    if (option.state & QStyle::State_Selected) {
        painter->fillRect(rect, QColor(230, 230, 255));
    } else {
        painter->fillRect(rect, Qt::white);
    }
    
    // 绘制卡片边框
    painter->setPen(QPen(Qt::lightGray));
    painter->drawRect(rect);

    // 设置字体
    QFont nameFont = painter->font();
    nameFont.setBold(true);
    nameFont.setPointSize(10);
    
    QFont normalFont = painter->font();
    normalFont.setPointSize(9);
    
    // 计算文本区域
    int padding = 10;
    QRect nameRect = rect.adjusted(padding, padding, -padding, 0);
    nameRect.setHeight(25);
    
    QRect dateRect = nameRect;
    dateRect.translate(0, nameRect.height());
    
    QRect descRect = dateRect;
    descRect.translate(0, dateRect.height());
    descRect.setHeight(40);

    // 绘制文本
    painter->setFont(nameFont);
    painter->setPen(Qt::black);
    painter->drawText(nameRect, Qt::AlignLeft | Qt::AlignVCenter, data.name);
    
    painter->setFont(normalFont);
    painter->setPen(Qt::darkGray);
    painter->drawText(dateRect, Qt::AlignLeft | Qt::AlignVCenter, data.date);
    
    // 绘制描述文本，支持自动换行
    painter->drawText(descRect, Qt::AlignLeft | Qt::AlignTop | Qt::TextWordWrap, 
                     data.description);

    painter->restore();
}

QSize CardItemDelegate::sizeHint(const QStyleOptionViewItem& option,
                                const QModelIndex& index) const
{
    Q_UNUSED(option);
    Q_UNUSED(index);
    return QSize(300, 100); // 卡片固定大小
}

MainWindow::MainWindow(QWidget* parent)
    : QWidget(parent)
{
    setWindowTitle(tr("卡片列表示例"));
    resize(400, 600);

    // 创建布局
    auto layout = new QVBoxLayout(this);
    
    // 创建列表控件
    listWidget = new QListWidget(this);
    listWidget->setSpacing(5); // 设置卡片间距
    listWidget->setViewMode(QListView::ListMode);
    listWidget->setItemDelegate(new CardItemDelegate(listWidget));
    
    // 设置样式
    listWidget->setStyleSheet(
        "QListWidget {"
        "    background-color: #f0f0f0;"
        "    border: none;"
        "}"
        "QListWidget::item {"
        "    background-color: transparent;"
        "}"
        "QListWidget::item:selected {"
        "    background-color: transparent;"
        "}"
    );

    layout->addWidget(listWidget);

    // 添加示例数据
    for (int i = 1; i <= 10; ++i) {
        CardData data{
            QString(tr("项目 %1")).arg(i),
            QDate::currentDate().toString("yyyy-MM-dd"),
            QString(tr("这是项目 %1 的详细描述信息，可以包含多行文本内容。")).arg(i)
        };
        addCardItem(data);
    }
}

void MainWindow::addCardItem(const CardData& data)
{
    QListWidgetItem* item = new QListWidgetItem(listWidget);
    item->setData(Qt::UserRole, QVariant::fromValue(data));
    listWidget->addItem(item);
}

// 注册自定义数据类型
Q_DECLARE_METATYPE(CardData)

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    
    // 设置编码和字体
    QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
    QFont font("Microsoft YaHei");
    app.setFont(font);
    
    MainWindow window;
    window.show();
    
    return app.exec();
}