#include "sessionfriendarea.h"


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

using namespace model;

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(228, 228, 228);      /* 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->setMinimumWidth(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(SessionItemType, QString::number(i), 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(228, 228, 228); }");


    //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; font-weight: 600; }");
    nameLabel->setFixedHeight(35);
    nameLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);

    //创建消息预览的label
    messageLabel = new QLabel();
    messageLabel->setText(text);
    messageLabel->setStyleSheet("QLabel { font-size: 12px; font-weight: 600; color: rgb(153, 153, 153); }");
    messageLabel->setFixedHeight(35);
    messageLabel->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);


    //添加到网格布局
    layout->addWidget(avatarBtn, 0, 0, 2, 2);
    layout->addWidget(nameLabel, 0, 2, 1, 20);
    layout->addWidget(messageLabel, 1, 2, 1, 25);
}

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(QEnterEvent *event)
{
    (void) event;

    if(this->selected) {
        return;
    }

    this->setStyleSheet("QWidget { background-color: rgb(215, 215, 215); }");
}

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

    if(this->selected) {
        return;
    }

    this->setStyleSheet("QWidget { background-color: rgb(228, 228, 228); }");
}

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(228, 228, 228); }");
        }
    }
    //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(196, 196, 196); }");
    this->selected = true;

    //调用Active
    this->active();
}

void SessionFriendItem::active()
{
    //父类不写
    //并不需要实现任何逻辑
}

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();
        }
    }
}


//////////////////////////////////////////////////////////////////////////////////
//此时这个函数添加的就不是SessionFriendItem了，而是其子类
//SessionItem FriendItem ApplyItem
void SessionFriendArea::addItem(ItemType itemType, const QString& id, 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);

    SessionFriendItem* item = nullptr;
    switch (itemType) {
    case SessionItemType:
        item = new SessionItem(this, id, avatar, name, text);
        break;
    case FriendItemType:
        item = new FriendItem(this, id, avatar, name, text);
        break;
    case ApplyItemType:
        item = new ApplyItem(this, id, avatar, name);
        break;
    default:
        LOG() << "Error ItemType: " << itemType;
        return;
    }

    container->layout()->addWidget(item);
}

void SessionFriendArea::clickItem(int index)
{
    if(index < 0 || index > container->layout()->count()) {
        LOG() << "The subscript of the clicked element is out of range... index:" << index;
        return;
    }
    QLayoutItem* layoutItem = container->layout()->itemAt(index);
    if(layoutItem == nullptr || layoutItem->widget() == nullptr) {
        LOG() << "The specified element does not exist... index: " << index;
        return;
    }
    SessionFriendItem* item = dynamic_cast<SessionFriendItem*>(layoutItem->widget());
    item->select();
}

////////////////////////////////////////
/// 会话Item的实现
////////////////////////////////////////
SessionItem::SessionItem(QWidget *owner, const QString &chatSessionId, const QIcon &avatar,
                         const QString &name, const QString &lastmessage)
    :SessionFriendItem(owner, avatar, name, lastmessage), chatSessionId(chatSessionId), text(lastmessage)
{
    //处理更新最后一个消息的信号
    DataCenter* dataCenter = DataCenter::getInstance();
    connect(dataCenter, &DataCenter::updateLastMessage, this, &SessionItem::updateLastMessage);

    //需要显示出未读消息的数目，需持久化，否则重启即丢失
    int unread = dataCenter->getUnread(chatSessionId);
    if (unread > 0) {
        //说明存在未读消息
        //this->messageLabel->setText(QString("[未读%1条]").arg(unread) + lastmessage);
        QString coloredPart = QString("[未读%1条]").arg(unread).toHtmlEscaped();
        QString escapedText = lastmessage.toHtmlEscaped();
        messageLabel->setText(QString(
            "<span style=\"color: rgb(221, 43, 43);\">%1</span>"
            "<span style=\"color: rgb(153, 153, 153);\">%2</span>"
        ).arg(coloredPart, escapedText));
    }
}

void SessionItem::updateLastMessage(const QString& chatSessionId)
{
    DataCenter* dataCenter = DataCenter::getInstance();
    //先判定，信号中的会话id得和当前元素自身持有放到会话id一致，才真正处理
    if (this->chatSessionId != chatSessionId) {
        //当前SessionItem不是正在发消息的SessionItem
        return;
    }
    //chatSession匹配，真正更新最后一条消息

    //把最后一条消息获取到
    QList<Message>* messageList = dataCenter->getRecentMessageList(chatSessionId);
    if (messageList == nullptr || messageList->size() == 0) {
        //当前会话没有任何消息，无需更新
        return;
    }
    const Message& lastMessage = messageList->back();

    //明确显示的文本内容
    if (lastMessage.messageType == TEXT_TYPE) {
        text = lastMessage.content;
    }
    else if (lastMessage.messageType == IMAGE_TYPE) {
        text = "[图片]";
    }
    else if (lastMessage.messageType == FILE_TYPE) {
        text = "[文件]";
    }
    else if (lastMessage.messageType == SPEECH_TYPE) {
        text = "[语音]";
    }
    else {
        LOG() << "错误的消息类型";
        return;
    }

    //把这个内容显示到界面上
    //后续还要考虑到“未读消息”情况，
    if (chatSessionId == dataCenter->getCurrentSessionId()) {
        this->messageLabel->setText(text);
    }
    else {
        int unread = dataCenter->getUnread(chatSessionId);
        if (unread > 0) {
            //说明存在未读消息
            //this->messageLabel->setText(QString("[未读%1条]").arg(unread) + text);
            QString coloredPart = QString("[未读%1条]").arg(unread).toHtmlEscaped();
            QString escapedText = text.toHtmlEscaped();
            messageLabel->setText(QString(
                "<span style=\"color: rgb(221, 43, 43);\">%1</span>"
                "<span style=\"color: rgb(153, 153, 153);\">%2</span>"
            ).arg(coloredPart, escapedText));
        }
    }
}

void SessionItem::active()
{
    //点击之后，要加载会话历史消息的列表
    LOG() << "click SessionItem... chatSessionId: " << chatSessionId;

    //加载会话历史消息，会涉及到当前内存数据的操作，又会涉及到网络通信，以及UI界面的变更
    MainWidget* mainWidget = MainWidget::getInstance();
    mainWidget->loadRecentMessage(chatSessionId);

    //清空未读消息数据，并更新显示
    DataCenter* dataCenter = DataCenter::getInstance();
    dataCenter->clearUnread(chatSessionId);

    //更新界面的显示->把未读x条干掉
    this->messageLabel->setText(text);
}

////////////////////////////////////////
/// 好友Item的实现
////////////////////////////////////////
FriendItem::FriendItem(QWidget *owner, const QString &userId, const QIcon &avatar,
                       const QString &name, const QString &description)
    :SessionFriendItem(owner, avatar, name, description), userId(userId)
{

}

void FriendItem::active()
{
    //点击之后，要激活对应的会话列元素
    LOG() << "click FriendItem... userId: " << userId;

    MainWidget* mainWidget = MainWidget::getInstance();
    mainWidget->switchSession(userId);
}

////////////////////////////////////////
/// 好友申请Item的实现
////////////////////////////////////////
ApplyItem::ApplyItem(QWidget *owner, const QString &userId, const QIcon &avatar,
                     const QString &name)
    :SessionFriendItem(owner, avatar, name, ""), userId(userId)
{
    //移除父类的messageLabel
    QGridLayout* layout = dynamic_cast<QGridLayout*>(this->layout());
    layout->removeWidget(messageLabel);
    //要记得释放内存，否则会内存泄露
    delete messageLabel;

    //创建两个按钮
    QPushButton* acceptBtn = new QPushButton();
    acceptBtn->setStyleSheet("QPushButton {color: rgb(255, 255, 255); background-color: rgb(7, 193, 96); border: none; border-radius: 5px; } ");
    acceptBtn->setText("同意");
    acceptBtn->setFixedSize(40, 20);
    QPushButton* rejectBtn = new QPushButton();
    rejectBtn->setStyleSheet("QPushButton {color: rgb(250, 81, 81); background-color: rgb(190, 190, 190); border: none; border-radius: 5px; } ");
    rejectBtn->setText("拒绝");
    rejectBtn->setFixedSize(40, 20);

    //添加到布局管理器中
    layout->addWidget(acceptBtn, 1, 2, 1, 4);
    layout->addWidget(rejectBtn, 1, 6, 1, 4);

    //添加信号槽
    connect(acceptBtn, &QPushButton::clicked, this, &ApplyItem::acceptFriendApply);
    connect(rejectBtn, &QPushButton::clicked, this, &ApplyItem::rejectFriendApply);
}

void ApplyItem::acceptFriendApply()
{
    //发送网络请求，告知服务器，同意了好友的申请
    DataCenter* dataCenter = DataCenter::getInstance();
    //看同意了谁的好友申请
    dataCenter->acceptFriendApplyAsync(this->userId);
}

void ApplyItem::rejectFriendApply()
{
    DataCenter* dataCenter = DataCenter::getInstance();
    dataCenter->rejectFriendApplyAsync(this->userId);
}

void ApplyItem::active()
{
    //本就不需要实现任何内容
    LOG() << "click ApplyItem... userId: " << userId;
}