#include "sessionfriendarea.h"


#include "debug.h"
#include "model/data.h"

SessionFriendArea::SessionFriendArea(QWidget *parent)
    : QScrollArea {parent}
{
    //设置必要属性
    //设置这个才能有滚动效果
    this->setWidgetResizable(true);
    //设置滚动条相关样式
    // this->verticalScrollBar()->setStyleSheet("QScrollBar:vertical { width: 2px; background-color: rgb(46, 46, 46); }");
    //去除或隐藏水平滚动条
    // this->horizontalScrollBar()->setStyleSheet("QScrollBar:horizontal { height: 0px; }");
    this->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    this->verticalScrollBar()->setStyleSheet(R"(
    QScrollBar:vertical {
        background-color: rgb(231, 231, 231);      /* 滚动条背景透明 */
        width: 6px;                  /* 默认宽度 */
        margin: 0px 0px 0px 0px;     /* 边距清零 */
    }
    QScrollBar::handle:vertical {
        background: #CCCCCC;         /* 滑块颜色（浅灰色） */
        min-height: 30px;            /* 滑块最小高度 */
        border-radius: 3px;          /* 圆角 */
    }
    QScrollBar::handle:vertical:hover {
        background: #999999;         /* 悬停时滑块颜色加深 */
        width: 10px;                 /* 悬停时宽度增大 */
    }
    QScrollBar::handle:vertical:pressed {
        background: #666666;         /* 按下时颜色更深 */
    }
    QScrollBar::add-line:vertical,
    QScrollBar::sub-line:vertical {
        height: 0px;                 /* 隐藏上下箭头按钮 */
        background: none;
    }
    QScrollBar::add-page:vertical,
    QScrollBar::sub-page:vertical {
        background: none;            /* 滚动条背景区域透明 */
    }
)");

    //去除默认的黑边
    this->setStyleSheet("border: 0px solid transparent;");

    // 把widget创建出来
    container = new QWidget();
    container->setFixedWidth(310);
    this->setWidget(container);

    //给这个widget添加布局管理器方便后续添加元素进去
    QVBoxLayout* layout = new QVBoxLayout();
    layout->setContentsMargins(0, 0, 0, 0);
    layout->setSpacing(0);
    layout->setAlignment(Qt::AlignTop);
    container->setLayout(layout);

    // //简单测试一下滚动的效果(just for testing...)
    // for(int i = 0; i < 50; i++) {
    //     QPushButton* btn = new QPushButton();
    //     QString Sbtn = "button: " + QString::number(i);
    //     btn->setText(Sbtn);
    //     layout->addWidget(btn);
    // }

    //构造一些临时数据作为界面调试的依据
#if TEST_UI
        QIcon icon(":/resource/image/defaultAv.png");
        for(int i = 0; i < 30; i++) {
            this->addItem(icon, "张三" + QString::number(i), "test: last message..." + QString::number(i));
        }
    // LOG() << "hello world!";
#endif
}

SessionFriendItem::SessionFriendItem(QWidget* owner, const QIcon& avatar, const QString& name, const QString& text)
    :owner(owner)
{
    this->setFixedHeight(70);
    this->setStyleSheet("QWidget { background-color: rgb(231, 231, 231); }");

    //创建网格布局管理器
    QGridLayout* layout = new QGridLayout();
    layout->setContentsMargins(20, 0, 0, 0);
    // layout->setSpacing(0);

    layout->setHorizontalSpacing(10);
    layout->setVerticalSpacing(0);

    this->setLayout(layout);

    //创建头像
    QPushButton* avatarBtn = new QPushButton();
    avatarBtn->setFixedSize(50, 50);
    avatarBtn->setIconSize(QSize(50, 50));
    avatarBtn->setIcon(avatar);
    avatarBtn->setStyleSheet("QPushButton {border: none;} ");
    avatarBtn->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

    //创建名字
    QLabel* nameLabel = new QLabel();
    nameLabel->setText(name);
    nameLabel->setStyleSheet("QLabel { font-size: 18px; fontweight: 600; }");
    nameLabel->setFixedHeight(35);
    nameLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);

    //创建消息预览的label
    QLabel* messageLabel = new QLabel();
    messageLabel->setText(text);
    messageLabel->setStyleSheet("QLabel { font-size: 18px; fontweight: 600; }");
    messageLabel->setFixedHeight(35);
    messageLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);


    layout->addWidget(avatarBtn, 0, 0, 2, 2);
    layout->addWidget(nameLabel, 0, 2, 1, 1);
    layout->addWidget(messageLabel, 1, 2, 1, 1);
}

void SessionFriendItem::paintEvent(QPaintEvent *event)
{
    (void) event;
    QStyleOption opt;
    opt.initFrom(this);
    QPainter p(this);
    style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
}

void SessionFriendItem::mousePressEvent(QMouseEvent *event)
{
    (void) event;

    select();
}

void SessionFriendItem::enterEvent(QEvent *event)
{
    (void) event;

    if(this->selected) {
        return;
    }

    this->setStyleSheet("QWidget { background-color: rgb(220, 220, 220); }");
}

void SessionFriendItem::leaveEvent(QEvent *event)
{
    (void) event;

    if(this->selected) {
        return;
    }

    this->setStyleSheet("QWidget { background-color: rgb(231, 231, 231); }");
}

void SessionFriendItem::select()
{
    //遍历其他元素(还原背景色)
    const QObjectList children = this->parentWidget()->children();
    for(QObject* child : children) {
        if(!child->isWidgetType()) {
            continue;
        }
        //说明是widget  那就将child强转为SessionFriendItem
        SessionFriendItem* item = dynamic_cast<SessionFriendItem*>(child);
        if(item->selected) {
            item->selected = false;
            item->setStyleSheet("QWidget { background-color: rgb(231, 231, 231); }");
        }
    }
    //鼠标点击时会触发这个事件
    //点击时修改背景色
    this->setStyleSheet("QWidget { background-color: rgb(210, 210, 210); }");
    this->selected = true;
}

void SessionFriendArea::clear()
{
    QLayout* layout = container->layout();
    //遍历布局管理器中的所有元素,依次从布局管理器中删除
    for(int i = layout->count() - 1; i >= 0; i--) {
        //takeAt就能够移除对应下标的元素,但还需要释放对象
        QLayoutItem* item = layout->takeAt(i);
        //进行释放
        if(item->widget()) {
            //把这个移除内容的widget进行释放
            delete item->widget();
        }
    }
}

void SessionFriendArea::addItem(const QIcon &avatar, const QString &name, const QString &text)
{
    //构造一个Item
    SessionFriendItem* Item = new SessionFriendItem(this, avatar, name, text);
    //将Item添加到container中
    container->layout()->addWidget(Item);
}