#include "numkeydia.h"
#include "ui_numkeydia.h"

#include <QDebug>
#include <QFile>
#include <QMouseEvent>
#include <QPushButton>
#include <QShortcut>
#include <QTextStream>
#include <QtGlobal>

namespace
{
void loadKeyboardStyleSheet(QWidget *widget)
{
    if(!widget)
    {
        return;
    }

    QFile file(QStringLiteral(":/commonWidget.qss"));
    if(!file.open(QFile::ReadOnly | QFile::Text))
    {
        qDebug() << QStringLiteral("Unable to load keyboard stylesheet");
        return;
    }

    QTextStream stream(&file);
    widget->setStyleSheet(stream.readAll());
}
}

NumKeyDia *NumKeyDia::singleton = nullptr;

NumKeyDia::NumKeyDia(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::NumKeyDia)
{
    loadKeyboardStyleSheet(this);
    if(singleton != nullptr)
    {
        return;
    }
    singleton = this;
    ui->setupUi(this);
    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
    ui->lineEdit_input->setFocusPolicy(Qt::StrongFocus);
    auto _btnInputList = ui->widget_input->findChildren<QPushButton *>();
    foreach (auto &i, _btnInputList)
    {
        connect(i, &QPushButton::clicked, this, &NumKeyDia::btn_input_clicked);
        i->setFocusPolicy(Qt::NoFocus);
    }

    auto *returnShortcut = new QShortcut(QKeySequence(Qt::Key_Return), this);
    connect(returnShortcut, &QShortcut::activated, this, &NumKeyDia::on_btn_ok_clicked);

    auto *enterShortcut = new QShortcut(QKeySequence(Qt::Key_Enter), this);
    connect(enterShortcut, &QShortcut::activated, this, &NumKeyDia::on_btn_ok_clicked);

    ui->toolButton_ico->installEventFilter(this);
    ui->label_appInfo->installEventFilter(this);
    ui->btn_clear->setText(QStringLiteral("<"));
    setInputPage(InputPage::NumberPage);
}

NumKeyDia::~NumKeyDia()
{
    if(singleton == this)
    {
        singleton = nullptr;
    }
    delete ui;
}

bool NumKeyDia::eventFilter(QObject *, QEvent *event)
{
    if(event->type() == QEvent::MouseButtonPress)
    {
        auto *mouseEvent = static_cast<QMouseEvent *>(event);
        m_point = mouseEvent->globalPos() - frameGeometry().topLeft();
    }
    else if(event->type() == QEvent::MouseMove)
    {
        auto *mouseEvent = static_cast<QMouseEvent *>(event);
        move(mouseEvent->globalPos() - m_point);
    }
    return false;
}

void NumKeyDia::setValue(const QString &value)
{
    this->value = value;
    setInputPage(InputPage::NumberPage);
    ui->lineEdit_input->setFocus();
    ui->lineEdit_input->setText(value);
    ui->lineEdit_input->setCursorPosition(ui->lineEdit_input->text().size());

    m_firstInputFlag = true;
}

QString &NumKeyDia::getValue()
{
    return value;
}

void NumKeyDia::on_btn_ok_clicked()
{
    QString _res = ui->lineEdit_input->text();
    if(_res.isEmpty())
    {
        _res = QStringLiteral("0");
    }

    value = _res;

    closeKeyBoard();
}

void NumKeyDia::on_btn_cancel_clicked()
{
    closeKeyBoard();
}

void NumKeyDia::on_btn_clear_clicked()
{
    m_firstInputFlag = false;
    const int currentPosition = ui->lineEdit_input->cursorPosition();
    ui->lineEdit_input->setCursorPosition(qMax(0, currentPosition - 1));
    ui->lineEdit_input->setFocus();
}

void NumKeyDia::on_btn_back_clicked()
{
    m_firstInputFlag = false;

    int _index = ui->lineEdit_input->cursorPosition();
    QString _currentText = ui->lineEdit_input->text();

    if(_currentText.isEmpty())
    {
        ui->lineEdit_input->setFocus();
    }

    if(_index != 0)
    {
        _currentText.remove(_index - 1, 1);
        ui->lineEdit_input->setText(_currentText);
    }

    ui->lineEdit_input->setFocus();
    ui->lineEdit_input->setCursorPosition(qMax(0, _index - 1));
}

void NumKeyDia::btn_input_clicked()
{
    auto *_btnClicked = qobject_cast<QPushButton *>(sender());
    if(!_btnClicked)
    {
        return;
    }

    if(_btnClicked->property("isModeSwitch").toBool())
    {
        const auto nextPage = (m_inputPage == InputPage::NumberPage)
                              ? InputPage::SymbolPage
                              : InputPage::NumberPage;
        setInputPage(nextPage);
        ui->lineEdit_input->setFocus();
        return;
    }

    if(m_firstInputFlag)
    {
        ui->lineEdit_input->clear();
        m_firstInputFlag = false;
    }

    const QString _inputValue = _btnClicked->property("inputValue").toString();
    if(_inputValue.isEmpty())
    {
        ui->lineEdit_input->setFocus();
        return;
    }

    int _index = ui->lineEdit_input->cursorPosition();
    QString _currentText = ui->lineEdit_input->text();

    _currentText.insert(_index, _inputValue);
    ui->lineEdit_input->setText(_currentText);
    ui->lineEdit_input->setFocus();
    ui->lineEdit_input->setCursorPosition(_index + _inputValue.size());
}

void NumKeyDia::closeKeyBoard()
{
    this->close();
}

void NumKeyDia::setInputPage(InputPage page)
{
    m_inputPage = page;
    refreshInputButtons();
}

void NumKeyDia::refreshInputButtons()
{
    if(m_inputPage == InputPage::NumberPage)
    {
        configureInputButton(ui->btn_1, QStringLiteral("1"), QStringLiteral("1"), true);
        configureInputButton(ui->btn_2, QStringLiteral("2"), QStringLiteral("2"), true);
        configureInputButton(ui->btn_3, QStringLiteral("3"), QStringLiteral("3"), true);
        configureInputButton(ui->btn_4, QStringLiteral("4"), QStringLiteral("4"), true);
        configureInputButton(ui->btn_5, QStringLiteral("5"), QStringLiteral("5"), true);
        configureInputButton(ui->btn_6, QStringLiteral("6"), QStringLiteral("6"), true);
        configureInputButton(ui->btn_7, QStringLiteral("7"), QStringLiteral("7"), true);
        configureInputButton(ui->btn_8, QStringLiteral("8"), QStringLiteral("8"), true);
        configureInputButton(ui->btn_9, QStringLiteral("9"), QStringLiteral("9"), true);
        configureInputButton(ui->btn_sub, QStringLiteral("#+="), QString(), true, true);
        configureInputButton(ui->btn_0, QStringLiteral("0"), QStringLiteral("0"), true);
        configureInputButton(ui->pushButton_dot, QStringLiteral("."), QStringLiteral("."), true);
        return;
    }

    configureInputButton(ui->btn_1, QStringLiteral("/"), QStringLiteral("/"), true);
    configureInputButton(ui->btn_2, QStringLiteral("-"), QStringLiteral("-"), true);
    configureInputButton(ui->btn_3, QStringLiteral(":"), QStringLiteral(":"), true);
    const QString degreeSymbol(QChar(0x00B0));
    configureInputButton(ui->btn_4, degreeSymbol, degreeSymbol, true);
    configureInputButton(ui->btn_5, QStringLiteral("'"), QStringLiteral("'"), true);
    configureInputButton(ui->btn_6, QStringLiteral("\""), QStringLiteral("\""), true);
    configureInputButton(ui->btn_7, QStringLiteral("."), QStringLiteral("."), true);
    configureInputButton(ui->btn_8, QStringLiteral("_"), QStringLiteral("_"), true);
    configureInputButton(ui->btn_9, QStringLiteral("@"), QStringLiteral("@"), true);
    configureInputButton(ui->btn_sub, QStringLiteral("123"), QString(), true, true);
    configureInputButton(ui->btn_0, QStringLiteral("+"), QStringLiteral("+"), true);
    configureInputButton(ui->pushButton_dot, QStringLiteral(","), QStringLiteral(","), true);
}

void NumKeyDia::configureInputButton(QPushButton *button,
                                     const QString &label,
                                     const QString &value,
                                     bool enabled,
                                     bool isModeSwitch)
{
    if(!button)
    {
        return;
    }

    button->setText(label);
    button->setEnabled(enabled);
    button->setProperty("inputValue", value);
    button->setProperty("isModeSwitch", isModeSwitch);
}

namespace KeyBoard
{
NumKeyDia *app()
{
    return NumKeyDia::instance();
};
};