#pragma once

#include "InputCore.h"
#include <QDebug>
#include <QHBoxLayout>
#include <QKeyEvent>
#include <QListWidgetItem>
#include <QPushButton>
#include <QScroller>
#include <QShowEvent>
#include <QVBoxLayout>
#include <QWidget>

#include <QLineEdit>
#include <QListWidget>
#include <utility>

#include "Core/Base/global_include.h"

namespace YSG {
    class VirtualKeyBoard;
    class KeyButton : public QPushButton {
    Q_OBJECT
    public:
        explicit KeyButton();
        Qt::Key mKey;
        QString mText;
        Qt::KeyboardModifiers modifiers = Qt::NoModifier;
        bool isText = false;
        VirtualKeyBoard *mVirtualKeyBoard{};
    };

    class VirtualKeyBoard : public QWidget, public Psc::Singleton<VirtualKeyBoard> {
    Q_OBJECT
    public:
        explicit VirtualKeyBoard(QWidget *parent = nullptr);
        ~VirtualKeyBoard() override;
        bool eventFilter(QObject *watched, QEvent *event) override;
        void setEdit(QWidget *edit);
        void getCandidateList(QString spell);
        bool issingleChar(QString spell);
        void handleKeyPress(KeyButton *button);
        bool mMoving = false;
        QPoint mStartPos, mStartGlobalPos;
        void mousePressEvent(QMouseEvent *event) override;
        void mouseMoveEvent(QMouseEvent *event) override;
        void mouseReleaseEvent(QMouseEvent *event) override;
    public:
        enum State {
            English,
            Chinese,
        } mState = English;
        QWidget *mInputWidget{};
        InputCore *mCore;
        KeyButton *
        createTextKey(const QString &showText, const QString &text, Qt::Key key, Qt::KeyboardModifiers modifiers,
                      QHBoxLayout *layout) {
            auto t = createTextKeyButton(text, key, layout, true);
            t->setText(showText);
            t->modifiers = modifiers;
            return t;
        }
        QSizePolicy sizePolicy;
        KeyButton *createTextKeyButton(const QString &text, Qt::Key key, QHBoxLayout *layout, bool isText = true) {
            auto ret = new KeyButton;
            ret->setObjectName(text);
            ret->mKey = key;
            ret->mText = text;
            ret->isText = isText;
            layout->addWidget(ret);
            ret->setSizePolicy(sizePolicy);
            ret->mVirtualKeyBoard = this;
            return ret;
        }
        QWidget *mEnglish, *mChinese, *mSymbol, *mCurWidget{};
        QVBoxLayout *mMainLayout;
        QLineEdit *mEdit{};
        QListWidget *listWidget{};
        QWidget *createChinese() {
            auto ret = new QWidget;
            auto mainLayout = new QVBoxLayout(ret);
            QFont font;
            font.setFamily("黑体"); // 设置字体为黑体
            font.setPointSize(16); // 设置字体大小为 16pt
            QSizePolicy sizePolicy2(QSizePolicy::Preferred, QSizePolicy::Preferred);
            mEdit = new QLineEdit;
            mEdit->setSizePolicy(sizePolicy2);
            listWidget = new QListWidget;
            listWidget->setSizePolicy(sizePolicy2);
            mEdit->setFont(font);
            listWidget->setFont(font);
            int lineHeight = QFontMetrics(font).lineSpacing() + 8;
            mEdit->setFixedHeight(lineHeight);
            listWidget->setFixedHeight(lineHeight);
            auto line0 = new QHBoxLayout;
            line0->addWidget(mEdit, 3);
            line0->addWidget(listWidget, 5);
            mainLayout->addLayout(line0);
            auto line1 = new QHBoxLayout();
            mainLayout->addLayout(line1, 5);
            createTextKey("q", "q", Qt::Key_Q, Qt::NoModifier, line1);
            createTextKey("w", "w", Qt::Key_W, Qt::NoModifier, line1);
            createTextKey("e", "e", Qt::Key_E, Qt::NoModifier, line1);
            createTextKey("r", "r", Qt::Key_R, Qt::NoModifier, line1);
            createTextKey("t", "t", Qt::Key_T, Qt::NoModifier, line1);
            createTextKey("y", "y", Qt::Key_Y, Qt::NoModifier, line1);
            createTextKey("u", "u", Qt::Key_U, Qt::NoModifier, line1);
            createTextKey("i", "i", Qt::Key_I, Qt::NoModifier, line1);
            createTextKey("o", "o", Qt::Key_O, Qt::NoModifier, line1);
            createTextKey("p", "p", Qt::Key_P, Qt::NoModifier, line1);
            auto line2 = new QHBoxLayout();
            mainLayout->addLayout(line2, 5);
            createTextKey("a", "a", Qt::Key_A, Qt::NoModifier, line2);
            createTextKey("s", "s", Qt::Key_S, Qt::NoModifier, line2);
            createTextKey("d", "d", Qt::Key_D, Qt::NoModifier, line2);
            createTextKey("f", "f", Qt::Key_F, Qt::NoModifier, line2);
            createTextKey("g", "g", Qt::Key_G, Qt::NoModifier, line2);
            createTextKey("h", "h", Qt::Key_H, Qt::NoModifier, line2);
            createTextKey("j", "j", Qt::Key_J, Qt::NoModifier, line2);
            createTextKey("k", "k", Qt::Key_K, Qt::NoModifier, line2);
            createTextKey("l", "l", Qt::Key_L, Qt::NoModifier, line2);
            auto line3 = new QHBoxLayout();
            mainLayout->addLayout(line3, 5);
            createTextKey("z", "z", Qt::Key_Z, Qt::NoModifier, line3);
            createTextKey("x", "x", Qt::Key_X, Qt::NoModifier, line3);
            createTextKey("c", "c", Qt::Key_C, Qt::NoModifier, line3);
            createTextKey("v", "v", Qt::Key_V, Qt::NoModifier, line3);
            createTextKey("b", "b", Qt::Key_B, Qt::NoModifier, line3);
            createTextKey("n", "n", Qt::Key_N, Qt::NoModifier, line3);
            createTextKey("m", "m", Qt::Key_M, Qt::NoModifier, line3);
            createTextKey("Backspace", "\b", Qt::Key_Backspace, Qt::NoModifier, line3);
            auto line4 = new QHBoxLayout();
            mainLayout->addLayout(line4, 5);
            auto changeTo123 = new QPushButton;
            line4->addWidget(changeTo123, 1);
            changeTo123->setSizePolicy(sizePolicy);
            changeTo123->setText("?123");
            connect(changeTo123, &KeyButton::clicked, [this, changeTo123]() {
                mCurWidget->hide();
                mSymbol->show();
            });
            auto changeToEnglish = new QPushButton;
            changeToEnglish->setText("En");
            changeToEnglish->setSizePolicy(sizePolicy);
            line4->addWidget(changeToEnglish, 1);
            connect(changeToEnglish, &KeyButton::clicked, [&, changeToEnglish]() {
                mCurWidget->hide();
                mEnglish->show();
                mCurWidget = mEnglish;
                mState = English;
            });
            auto space = createTextKey(" ", " ", Qt::Key_Space, Qt::NoModifier, line4);
            QSizePolicy sizePolicy1(QSizePolicy::Preferred, QSizePolicy::Preferred);
            sizePolicy1.setHorizontalStretch(5);
            space->setSizePolicy(sizePolicy1);
            auto hide = new QPushButton;
            hide->setText("隐藏");
            hide->setSizePolicy(sizePolicy);
            line4->addWidget(hide, 1);
            connect(hide, &KeyButton::clicked, this, &QWidget::hide);
            return ret;
        }
        QWidget *createEnglish() {
            auto ret = new QWidget;
            auto mainLayout = new QVBoxLayout(ret);
            auto line1 = new QHBoxLayout();
            mainLayout->addLayout(line1);
            createTextKey("q", "q", Qt::Key_Q, Qt::NoModifier, line1);
            createTextKey("w", "w", Qt::Key_W, Qt::NoModifier, line1);
            createTextKey("e", "e", Qt::Key_E, Qt::NoModifier, line1);
            createTextKey("r", "r", Qt::Key_R, Qt::NoModifier, line1);
            createTextKey("t", "t", Qt::Key_T, Qt::NoModifier, line1);
            createTextKey("y", "y", Qt::Key_Y, Qt::NoModifier, line1);
            createTextKey("u", "u", Qt::Key_U, Qt::NoModifier, line1);
            createTextKey("i", "i", Qt::Key_I, Qt::NoModifier, line1);
            createTextKey("o", "o", Qt::Key_O, Qt::NoModifier, line1);
            createTextKey("p", "p", Qt::Key_P, Qt::NoModifier, line1);
            auto line2 = new QHBoxLayout();
            mainLayout->addLayout(line2);
            createTextKey("a", "a", Qt::Key_A, Qt::NoModifier, line2);
            createTextKey("s", "s", Qt::Key_S, Qt::NoModifier, line2);
            createTextKey("d", "d", Qt::Key_D, Qt::NoModifier, line2);
            createTextKey("f", "f", Qt::Key_F, Qt::NoModifier, line2);
            createTextKey("g", "g", Qt::Key_G, Qt::NoModifier, line2);
            createTextKey("h", "h", Qt::Key_H, Qt::NoModifier, line2);
            createTextKey("j", "j", Qt::Key_J, Qt::NoModifier, line2);
            createTextKey("k", "k", Qt::Key_K, Qt::NoModifier, line2);
            createTextKey("l", "l", Qt::Key_L, Qt::NoModifier, line2);
            auto line3 = new QHBoxLayout();
            mainLayout->addLayout(line3);
            auto capsLock = new QPushButton;
            line3->addWidget(capsLock, 1);
            capsLock->setSizePolicy(sizePolicy);
            capsLock->setText("大写");
            connect(capsLock, &QPushButton::clicked, [this, capsLock]() {
                if (capsLock->text() == "大写") {
                    for (auto child: mEnglish->findChildren<KeyButton *>()) {
                        if ((child->mText.size() == 1) && child->text().isLower()) {
                            QString &&text = child->text().toUpper();
                            child->setText(text);
                            child->mText = text;
                        }
                    }
                    capsLock->setText("小写");
                } else {
                    for (auto child: mEnglish->findChildren<KeyButton *>()) {
                        if ((child->mText.size() == 1) && child->text().isUpper()) {
                            QString &&text = child->text().toLower();
                            child->setText(text);
                            child->mText = text;
                        }
                    }
                    capsLock->setText("大写");
                }
            });
            createTextKey("z", "z", Qt::Key_Z, Qt::NoModifier, line3);
            createTextKey("x", "x", Qt::Key_X, Qt::NoModifier, line3);
            createTextKey("c", "c", Qt::Key_C, Qt::NoModifier, line3);
            createTextKey("v", "v", Qt::Key_V, Qt::NoModifier, line3);
            createTextKey("b", "b", Qt::Key_B, Qt::NoModifier, line3);
            createTextKey("n", "n", Qt::Key_N, Qt::NoModifier, line3);
            createTextKey("m", "m", Qt::Key_M, Qt::NoModifier, line3);
            createTextKey("Backspace", "\b", Qt::Key_Backspace, Qt::NoModifier, line3);
            auto line4 = new QHBoxLayout();
            mainLayout->addLayout(line4);
            auto changeTo123 = new QPushButton;
            line4->addWidget(changeTo123, 1);
            changeTo123->setSizePolicy(sizePolicy);
            changeTo123->setText("?123");
            connect(changeTo123, &KeyButton::clicked, [this, changeTo123]() {
                mCurWidget->hide();
                mSymbol->show();
            });
            auto changeToCh = new QPushButton;
            changeToCh->setText("中文");
            changeToCh->setSizePolicy(sizePolicy);
            line4->addWidget(changeToCh, 1);
            connect(changeToCh, &KeyButton::clicked, [&]() {
                mCurWidget->hide();
                mChinese->show();
                mCurWidget = mChinese;
                mState = Chinese;
            });
            auto space = createTextKey(" ", " ", Qt::Key_Space, Qt::NoModifier, line4);
            QSizePolicy sizePolicy1(QSizePolicy::Preferred, QSizePolicy::Preferred);
            sizePolicy1.setHorizontalStretch(5);
            space->setSizePolicy(sizePolicy1);
            auto hide = new QPushButton;
            hide->setText("隐藏");
            hide->setSizePolicy(sizePolicy);
            line4->addWidget(hide, 1);
            connect(hide, &KeyButton::clicked, this, &QWidget::hide);
            return ret;
        }
        QWidget *createSymbol() {
            auto ret = new QWidget;
            auto mainLayout = new QVBoxLayout(ret);
            auto line1 = new QHBoxLayout();
            mainLayout->addLayout(line1);
            createTextKey("1", "1", Qt::Key_1, Qt::NoModifier, line1);
            createTextKey("2", "2", Qt::Key_2, Qt::NoModifier, line1);
            createTextKey("3", "3", Qt::Key_3, Qt::NoModifier, line1);
            createTextKey("4", "4", Qt::Key_4, Qt::NoModifier, line1);
            createTextKey("5", "5", Qt::Key_5, Qt::NoModifier, line1);
            createTextKey("6", "6", Qt::Key_6, Qt::NoModifier, line1);
            createTextKey("7", "7", Qt::Key_7, Qt::NoModifier, line1);
            createTextKey("8", "8", Qt::Key_8, Qt::NoModifier, line1);
            createTextKey("9", "9", Qt::Key_9, Qt::NoModifier, line1);
            createTextKey("0", "0", Qt::Key_0, Qt::NoModifier, line1);
            auto line2 = new QHBoxLayout();
            mainLayout->addLayout(line2);
            createTextKey("!", "!", Qt::Key_1, Qt::ShiftModifier, line2);
            createTextKey("@", "@", Qt::Key_2, Qt::ShiftModifier, line2);
            createTextKey("#", "#", Qt::Key_3, Qt::ShiftModifier, line2);
            createTextKey("%", "%", Qt::Key_5, Qt::ShiftModifier, line2);
            createTextKey("&&", "&", Qt::Key_7, Qt::ShiftModifier, line2);
            createTextKey("*", "*", Qt::Key_8, Qt::ShiftModifier, line2);
            createTextKey("(", "(", Qt::Key_9, Qt::ShiftModifier, line2);
            createTextKey(")", ")", Qt::Key_0, Qt::ShiftModifier, line2);
            createTextKey("-", "-", Qt::Key_Minus, Qt::NoModifier, line2);
            auto line3 = new QHBoxLayout();
            mainLayout->addLayout(line3);
            createTextKey("_", "_", Qt::Key_Underscore, Qt::ShiftModifier, line3);
            createTextKey(":", ":", Qt::Key_Colon, Qt::ShiftModifier, line3);
            createTextKey(";", ";", Qt::Key_Semicolon, Qt::NoModifier, line3);
            createTextKey("/", "/", Qt::Key_Slash, Qt::NoModifier, line3);
            createTextKey(".", ".", Qt::Key_Period, Qt::NoModifier, line3);
            createTextKey(",", ",", Qt::Key_Comma, Qt::NoModifier, line3);
            createTextKey("?", "?", Qt::Key_Question, Qt::ShiftModifier, line3);
            createTextKey("Backspace", "\b", Qt::Key_Backspace, Qt::NoModifier, line3);
            auto line4 = new QHBoxLayout();
            mainLayout->addLayout(line4);
            auto back = new QPushButton;
            back->setText("返回");
            back->setSizePolicy(sizePolicy);
            line4->addWidget(back, 1);
            connect(back, &KeyButton::clicked, [&]() {
                mSymbol->hide();
                mCurWidget->show();
            });
            auto space = createTextKey(" ", " ", Qt::Key_Space, Qt::NoModifier, line4);
            QSizePolicy sizePolicy1(QSizePolicy::Preferred, QSizePolicy::Preferred);
            sizePolicy1.setHorizontalStretch(5);
            space->setSizePolicy(sizePolicy1);
            auto hide = new QPushButton;
            hide->setText("隐藏");
            hide->setSizePolicy(sizePolicy);
            line4->addWidget(hide, 1);
            connect(hide, &KeyButton::clicked, this, &QWidget::hide);
            return ret;
        }
    };
}