#include "DigitalInput.h"
#include "ui_digitalinput.h"
#include "MyInputMethod.h"
#include <QObject>
#include <QSpinBox>
#include <QDoubleSpinBox>
#include <QSpinBox>
#include <QRegularExpression>
#include <QDebug>
#include <QKeyEvent>

DigitalInput::DigitalInput(MyInputMethod *myInputMethod,QWidget *parent) :
    QWidget(parent,(Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint | Qt::Tool | Qt::BypassWindowManagerHint)),
    ui(new Ui::DigitalInput)
{
    ui->setupUi(this);
    this->myInputMethod = myInputMethod;

    connect(ui->Key_0,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_1,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_2,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_3,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_4,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_5,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_6,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_7,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_8,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_9,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_pluse,SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_dot, SIGNAL(pressed()),this,SLOT(onCharPressed()));
    connect(ui->Key_backspace,SIGNAL(pressed()),this,SLOT(onKeyBackspacePressed()));
    // connect(ui->Key_selectAll,SIGNAL(pressed()),this,SLOT(onKeySelectAllPressed()));
    // connect(ui->Key_up,SIGNAL(pressed()),this,SLOT(onKeyUpPressed()));
    // connect(ui->Key_down,SIGNAL(pressed()),this,SLOT(onKeyDownPressed()));

    connect(ui->enterBtn, &QPushButton::clicked, this, &DigitalInput::onEnterPressed);
    connect(ui->clrBtn, &QPushButton::clicked, this, &DigitalInput::onClrPressed);

    // 所有键盘按钮不接收焦点，避免点击按钮时 traceEdit 丢失焦点
    QList<QPushButton*> btns = findChildren<QPushButton*>();
    for (QPushButton* btn : btns) {
        btn->setFocusPolicy(Qt::NoFocus);
    }

    ui->traceEdit->setFocusPolicy(Qt::StrongFocus);
}

DigitalInput::~DigitalInput()
{
    delete ui;
}


void DigitalInput::onCharPressed(){
    QPushButton * button = qobject_cast<QPushButton *>(sender());
    QString ch = button->text();
    if (!m_currSpinBox && !m_currDoubleSpinBox) {
        ui->traceEdit->insert(ch);
        return;
    }

    int cursorPos = ui->traceEdit->cursorPosition();
    QString currentText = ui->traceEdit->text();
    QString newText = currentText.left(cursorPos) + ch + currentText.mid(cursorPos);

    if (newText.isEmpty()) {
        ui->traceEdit->insert(ch);
        return;
    }

    if(m_currDoubleSpinBox) {
        // 用正则表达式判定 newText是否是一个浮点数或部分浮点输入。
        // 允许的示例: 0.2251, 15.335, 15, -924.02, 5. (末尾点为临时状态), .5
        // 也允许单独的正负号作为正在输入中的状态: "-" 或 "+"
        QString simulated = newText;

        // Allow single sign while typing
        if (simulated == "-" || simulated == "+") {
            ui->traceEdit->insert(ch);
            return;
        }

        // Regular expression: optional sign, then either digits with optional dot+digits, or dot+digits, or digits+dot (partial)
        // 不限制小数位数；最终的最小/最大以及精度由 hideEvent 写回时决定
        QRegularExpression re("^[+-]?((\\d+(\\.\\d*)?)|(\\.\\d*))$");
        QRegularExpressionMatch match = re.match(simulated);
        if (!match.hasMatch()) {
            // not a valid float format (even partial) -> reject
            return;
        }

        // acceptable -> insert
        ui->traceEdit->insert(ch);
        return;
    }

    if(ch == "." && m_currSpinBox) {
        // SpinBox不能输入 .
        return;
    }

    if(ch == "-" && m_currSpinBox->minimum() < 0 && currentText.isEmpty()) {
        ui->traceEdit->insert(ch);
        return;
    }

    bool ok = false;
    int value = newText.toInt(&ok);
    if (!ok) {
        return;
    }

    int max = m_currSpinBox->maximum();
    if (value <= max) {
        ui->traceEdit->insert(ch);
    }
}

void DigitalInput::onKeyBackspacePressed(){
    int cursorPos = ui->traceEdit->cursorPosition();
    if (cursorPos > 0) {
        QString text = ui->traceEdit->text();
        text.remove(cursorPos - 1, 1);
        ui->traceEdit->setText(text);
        ui->traceEdit->setCursorPosition(cursorPos - 1);
    }
}

void DigitalInput::onKeySelectAllPressed(){
#ifndef Q_OS_WIN32
    	//QWSServer::sendKeyEvent(0,Qt::Key_A,Qt::ControlModifier,true,false);		//锟斤拷系统锟斤拷锟酵硷拷锟斤拷锟铰硷拷
    	//if(!init)
    	//	QWSServer::sendKeyEvent(0,Qt::Key_A,Qt::ControlModifier,true,false);		//锟斤拷系统锟斤拷锟酵硷拷锟斤拷锟铰硷拷
    	//init = 1;

MyInputMethod::sendEvent(Qt::Key_A, Qt::ControlModifier);
#endif


}
void DigitalInput::onKeyUpPressed(){
#ifndef Q_OS_WIN32
//QWSServer::sendKeyEvent(0,Qt::Key_Up,Qt::NoModifier,true,false);		//锟斤拷系统锟斤拷锟酵硷拷锟斤拷锟铰硷拷
    MyInputMethod::sendEvent(Qt::Key_Up,Qt::NoModifier);
#endif
}
void DigitalInput::onKeyDownPressed(){
#ifndef Q_OS_WIN32
//QWSServer::sendKeyEvent(0,Qt::Key_Down,Qt::NoModifier,true,false);		//锟斤拷系统锟斤拷锟酵硷拷锟斤拷锟铰硷拷
    MyInputMethod::sendEvent(Qt::Key_Down,Qt::NoModifier);
#endif
}

void DigitalInput::onEnterPressed()
{
    hide();
}

void DigitalInput::onClrPressed()
{
    ui->traceEdit->clear();
    ui->traceEdit->setFocus();
}

void DigitalInput::showEvent(QShowEvent *event)
{
    QWidget::showEvent(event);
    raise();

    auto focusWidget = qApp->focusWidget();

    QDoubleSpinBox* dbox = dynamic_cast<QDoubleSpinBox*>(focusWidget);
    if (dbox) {
        m_currDoubleSpinBox = dbox;
        m_currSpinBox = nullptr;
        // Show value without padding trailing zeros (avoid decimals() padding)
        ui->traceEdit->setText(QString::number(dbox->value(), 'g', 15));
        ui->traceEdit->setFocus();
        qDebug() << "The traceEdit has connected to the QDoubleSpinBox: " << dbox->objectName();
        return;
    }

    QSpinBox* box = dynamic_cast<QSpinBox*>(focusWidget);
    if(!box) {
        qWarning() << "focusWidget is not QSpinBox or QDoubleSpinBox";
        m_currSpinBox = nullptr;
        m_currDoubleSpinBox = nullptr;
        return;
    }

    m_currSpinBox = box;
    m_currDoubleSpinBox = nullptr;
    ui->traceEdit->setText(box->text());
    // focusWidget->clearFocus();
    ui->traceEdit->setFocus();

    // connect(box, QOverload<const QString&>::of(&QSpinBox::valueChanged), ui->traceEdit, &QLineEdit::setText);
    qDebug() << "The traceEdit has connected to the QSpinBox: " << box->objectName();
}

void DigitalInput::hideEvent(QHideEvent * event)
{
    QWidget::hideEvent(event);

    if (m_currDoubleSpinBox) {
        bool ok = false;
        double value = ui->traceEdit->text().toDouble(&ok);
        if (!ok) value = m_currDoubleSpinBox->value();
        double min = m_currDoubleSpinBox->minimum();
        double max = m_currDoubleSpinBox->maximum();
        value = qBound(min, value, max);
        m_currDoubleSpinBox->setValue(value);
        m_currDoubleSpinBox->clearFocus();
        return;
    }

    if(m_currSpinBox) {
        int value = ui->traceEdit->text().toInt();
        int min = m_currSpinBox->minimum();
        int max = m_currSpinBox->maximum();
        value = qBound(min, value, max);
        m_currSpinBox->setValue(value);
        m_currSpinBox->clearFocus();
    }
}