#include "titleBar.h"
#include <QStyle>
#include <QScreen>
#include <QGuiApplication>


TitleBar::TitleBar(QWidget *parent,bool bClose,bool bMaxMin)
    : QWidget(parent)
    , m_parentWindow(parent)
    ,_bShowClose(bClose)
    ,_bShowMaxMin(bMaxMin)
{
    setupUI();
    setFixedHeight(25);  // 稍微矮一点

    setAttribute(Qt::WA_StyledBackground, true);  // 启用样式背景
    setAttribute(Qt::WA_NoSystemBackground, false);

    // 确保有自己的调色板
    setAutoFillBackground(true);

    // 使用更具体的样式表
    QString style = R"(
        QWidget {
            background: #2c5282;
        }

        QLabel {
            color: white;
            font-size: 12px;
            background: transparent;
        }

        QPushButton {
            background: transparent;
            border: none;
            color: white;
            min-width: 20px;
            min-height: 20px;
        }
    )";

    setStyleSheet(style);

    if (m_parentWindow) {
        m_parentWindow->installEventFilter(this);
    }
}

void TitleBar::setupUI()
{
    QHBoxLayout *layout = new QHBoxLayout(this);
    layout->setContentsMargins(4, 0, 0, 0);
    layout->setSpacing(0);

    // 标题
    m_titleLabel = new QLabel("窗口标题");
    m_titleLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

    layout->addWidget(m_titleLabel);

    /* ===== 中间占位，用于居中 ===== */
    layout->addStretch();

    /* ===== 中间内容 Label ===== */
    m_centerLabel = new QLabel();
    m_centerLabel->setAlignment(Qt::AlignCenter);
    m_centerLabel->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

    layout->addWidget(m_centerLabel);

    /* ===== 右侧占位 ===== */
    layout->addStretch();

    if(_bShowMaxMin){
        // 最大化/还原按钮
        m_maximizeButton = new QPushButton(tr("🗖"));  // 最大化图标
        m_maximizeButton->setObjectName("maximizeButton");
        m_maximizeButton->setToolTip("最大化");

        layout->addWidget(m_maximizeButton);
        connect(m_maximizeButton, &QPushButton::clicked, this, &TitleBar::maximizeClicked);
    }

    if(_bShowClose){
        // 关闭按钮
        m_closeButton = new QPushButton("×");
        m_closeButton->setObjectName("closeButton");
        m_closeButton->setToolTip("关闭");

        layout->addWidget(m_closeButton);
        connect(m_closeButton, &QPushButton::clicked, this, &TitleBar::closeClicked);
    }
}

void TitleBar::setTitle(const QString &title)
{
    m_titleLabel->setText(title);
}

void TitleBar::setCenterText(const QString &text)
{
    if (m_centerLabel)
        m_centerLabel->setText(text);
}

void TitleBar::updateMaximizeButton()
{
    if(_bShowMaxMin){
        if (m_parentWindow) {
            m_isMaximized = m_parentWindow->isMaximized();
            if (m_isMaximized) {
                m_maximizeButton->setText(tr("🗗"));  // 还原图标
                m_maximizeButton->setToolTip("还原");
            } else {
                m_maximizeButton->setText(tr("🗖"));  // 最大化图标
                m_maximizeButton->setToolTip("最大化");
            }
        }
    }
}

void TitleBar::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        m_dragStartPosition = event->globalPosition().toPoint() - m_parentWindow->frameGeometry().topLeft();
        event->accept();
    }
}

void TitleBar::mouseMoveEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton) {
        m_parentWindow->move(event->globalPosition().toPoint() - m_dragStartPosition);
        event->accept();
    }
}

void TitleBar::mouseDoubleClickEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        emit maximizeClicked();
    }
}

bool TitleBar::eventFilter(QObject *watched, QEvent *event)
{
    if (watched == m_parentWindow && event->type() == QEvent::Show) {

        // 防止最大化/全屏时干扰
        if (m_parentWindow->isMaximized() ||
            m_parentWindow->isFullScreen()) {
            return false;
        }

        QScreen *screen = QGuiApplication::primaryScreen();
        if (!screen)
            return false;

        QRect screenRect = screen->availableGeometry();
        QRect windowRect = m_parentWindow->geometry(); // ✅ 正确

        int x = screenRect.x() + (screenRect.width()  - windowRect.width())  / 2;
        int y = screenRect.y() + (screenRect.height() - windowRect.height()) / 2;

        m_parentWindow->move(x, y);
    }

    return QWidget::eventFilter(watched, event);
}