#include "numkeydia.h"
#include "ui_numkeydia.h"
#include <QDebug>
#include <QFile>
#include <QMouseEvent>
#include <QPushButton>
#include <QShortcut>
#include <QTextStream>

// --- 私有类定义 ---
class NumKeyDiaPrivate {
    Q_DECLARE_PUBLIC(NumKeyDia)

public:
    NumKeyDiaPrivate(NumKeyDia *q) : q_ptr(q) {}

    // 成员变量移入 D-pointer
    Ui::NumKeyDia *ui = nullptr;
    QString value;
    QPoint m_point;
    bool m_firstInputFlag = true;

    enum class InputPage { NumberPage, SymbolPage };
    InputPage m_inputPage = InputPage::NumberPage;

    // 辅助函数
    void setInputPage(InputPage page);
    void refreshInputButtons();
    void configureInputButton(QPushButton *button, const QString &label,
                              const QString &value, bool enabled, bool isModeSwitch = false);
    void loadStyleSheet();

private:
    NumKeyDia *q_ptr; // 反向指针
};

// --- 私有类逻辑实现 ---

void NumKeyDiaPrivate::loadStyleSheet() {
    QFile file(QStringLiteral(":/commonWidget.qss"));
    if (file.open(QFile::ReadOnly | QFile::Text)) {
        QTextStream stream(&file);
        q_ptr->setStyleSheet(stream.readAll());
    }
}

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

void NumKeyDiaPrivate::refreshInputButtons() {
    if (m_inputPage == InputPage::NumberPage) {
        configureInputButton(ui->btn_1, "1", "1", true);
        configureInputButton(ui->btn_2, "2", "2", true);
        configureInputButton(ui->btn_3, "3", "3", true);
        configureInputButton(ui->btn_4, "4", "4", true);
        configureInputButton(ui->btn_5, "5", "5", true);
        configureInputButton(ui->btn_6, "6", "6", true);
        configureInputButton(ui->btn_7, "7", "7", true);
        configureInputButton(ui->btn_8, "8", "8", true);
        configureInputButton(ui->btn_9, "9", "9", true);
        configureInputButton(ui->btn_sub, "#+=", "", true, true);
        configureInputButton(ui->btn_0, "0", "0", true);
        configureInputButton(ui->pushButton_dot, ".", ".", true);
    } else {
        configureInputButton(ui->btn_1, "/", "/", true);
        configureInputButton(ui->btn_2, "-", "-", true);
        configureInputButton(ui->btn_3, ":", ":", true);
        QString deg = QChar(0x00B0);
        configureInputButton(ui->btn_4, deg, deg, true);
        configureInputButton(ui->btn_5, "'", "'", true);
        configureInputButton(ui->btn_6, "\"", "\"", true);
        configureInputButton(ui->btn_7, ".", ".", true);
        configureInputButton(ui->btn_8, "_", "_", true);
        configureInputButton(ui->btn_9, "@", "@", true);
        configureInputButton(ui->btn_sub, "123", "", true, true);
        configureInputButton(ui->btn_0, "+", "+", true);
        configureInputButton(ui->pushButton_dot, ",", ",", true);
    }
}

void NumKeyDiaPrivate::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);
}

// --- 公共类实现 ---

NumKeyDia *NumKeyDia::singleton = nullptr;

NumKeyDia::NumKeyDia(QWidget *parent)
    : QDialog(parent)
    , d_ptr(new NumKeyDiaPrivate(this)) // 初始化 d_ptr
{
    Q_D(NumKeyDia);

    if (!singleton) singleton = this;

    Q_INIT_RESOURCE(NumKeyBoard);

    d->ui = new Ui::NumKeyDia;
    d->ui->setupUi(this);
    d->loadStyleSheet();

    setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
    d->ui->lineEdit_input->setFocusPolicy(Qt::StrongFocus);

    auto btnList = d->ui->widget_input->findChildren<QPushButton *>();
    for (auto *btn : btnList) {
        connect(btn, &QPushButton::clicked, this, &NumKeyDia::btn_input_clicked);
        btn->setFocusPolicy(Qt::NoFocus);
    }

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

    d->ui->toolButton_ico->installEventFilter(this);
    d->ui->label_appInfo->installEventFilter(this);
    d->ui->btn_clear->setText(QStringLiteral("<"));

    d->setInputPage(NumKeyDiaPrivate::InputPage::NumberPage);
}

NumKeyDia::~NumKeyDia() {
    if (singleton == this) singleton = nullptr;
    // QScopedPointer 会自动删除 d_ptr，但 Ui 需手动销毁（如果没设置 parent）
    Q_D(NumKeyDia);
    delete d->ui;
}

NumKeyDia* NumKeyDia::instance() {
    if(!singleton)
        singleton = new NumKeyDia;
    return singleton;
}

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

void NumKeyDia::setValue(const QString &value) {
    Q_D(NumKeyDia);
    d->value = value;
    d->setInputPage(NumKeyDiaPrivate::InputPage::NumberPage);
    d->ui->lineEdit_input->setFocus();
    d->ui->lineEdit_input->setText(value);
    d->ui->lineEdit_input->setCursorPosition(d->ui->lineEdit_input->text().size());
    d->m_firstInputFlag = true;
}

QString &NumKeyDia::getValue() {
    Q_D(NumKeyDia);
    return d->value;
}

void NumKeyDia::on_btn_ok_clicked() {
    Q_D(NumKeyDia);
    QString res = d->ui->lineEdit_input->text();
    d->value = res.isEmpty() ? "0" : res;
    closeKeyBoard();
}

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

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

void NumKeyDia::on_btn_back_clicked() {
    Q_D(NumKeyDia);
    d->m_firstInputFlag = false;
    int index = d->ui->lineEdit_input->cursorPosition();
    QString text = d->ui->lineEdit_input->text();

    if (index > 0) {
        text.remove(index - 1, 1);
        d->ui->lineEdit_input->setText(text);
        d->ui->lineEdit_input->setCursorPosition(index - 1);
    }
    d->ui->lineEdit_input->setFocus();
}

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

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

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

    QString input = btn->property("inputValue").toString();
    if (input.isEmpty()) return;

    int index = d->ui->lineEdit_input->cursorPosition();
    QString text = d->ui->lineEdit_input->text();
    text.insert(index, input);
    d->ui->lineEdit_input->setText(text);
    d->ui->lineEdit_input->setFocus();
    d->ui->lineEdit_input->setCursorPosition(index + input.size());
}

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

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