#include "VirtualKeyBoard.h"
#include <QApplication>
#include <QDesktopWidget>
#include <QScreen>
namespace YSG {
    KeyButton::KeyButton() {
        /*支持长按*/
//        this->setAutoRepeat(true);
//        this->setAutoRepeatDelay(500);
//        this->setAutoRepeatInterval(100);
        connect(this, &QPushButton::pressed, [&]() {
            mVirtualKeyBoard->handleKeyPress(this);
        });
    }
    VirtualKeyBoard::VirtualKeyBoard(QWidget *parent) : QWidget(parent) {
        this->setStyleSheet(
                "QPushButton{"
                "font: 16pt 黑体;"
                "font-size: 26px;"
                "color: white;"
                "margin: 2px;"
                "border-radius: 5px;"
                "background: #00C78C;}"
                "QPushButton:pressed{"
                "background: #F0FFFF ;}"
                "QListWidget::Item:hover { background: #00C78C; color: white; }"
                "QListWidget {outline: none; border:1px solid #00000000; color: black; }"
                "QLineEdit {outline: none; border:1px solid #00000000; color: black;}"
        );
        QSize screenSize = QGuiApplication::primaryScreen()->size();
        resize(screenSize / 2);
        mMainLayout = new QVBoxLayout(this);
        sizePolicy.setHorizontalPolicy(QSizePolicy::Preferred);
        sizePolicy.setVerticalPolicy(QSizePolicy::Preferred);
        sizePolicy.setHorizontalStretch(1);
        sizePolicy.setVerticalStretch(0);
        mEnglish = createEnglish();
        mChinese = createChinese();
        mSymbol = createSymbol();
        mMainLayout->addWidget(mEnglish);
        mMainLayout->addWidget(mChinese);
        mMainLayout->addWidget(mSymbol);
        mCurWidget = mEnglish;
        mChinese->hide();
        mSymbol->hide();
        setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::Tool | Qt::WindowDoesNotAcceptFocus);
        mCore = new InputCore(this);
        if (!mCore->init()) {
            qDebug() << "字典加载失败，请将dict文件移至工作目录";
        }



        /* 设置为列表显示模式 */
        listWidget->setViewMode(QListView::ListMode);
        /* 从左往右排列 */
        listWidget->setFlow(QListView::LeftToRight);
        /* 屏蔽水平滑动条 */
        listWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        /* 屏蔽垂直滑动条 */
        listWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        /* 设置为像素滚动 */
        listWidget->setHorizontalScrollMode(QListWidget::ScrollPerPixel);
        /* 设置鼠标左键拖动 */
        QScroller::grabGesture(listWidget, QScroller::LeftMouseButtonGesture);
        //设置不可选中
        connect(mEdit, &QLineEdit::selectionChanged, [=] { mEdit->deselect(); });

        //中文输入
        connect(mEdit, &QLineEdit::textChanged, [=](const QString &text) {
            /* 单个字符过长引发崩溃
             * 处理：单个字符限制长度为10
             */
            if (text.isEmpty()) {
                return;
            }
            if (text.length() >= 10) {
                if (issingleChar(text)) {
                    QString deal_text = text.mid(0, 10);
                    getCandidateList(deal_text);
                    return;
                }
                getCandidateList(text);
                return;
            } else {
                getCandidateList(text);
            }
        });
        connect(listWidget, &QListWidget::itemClicked, [=](QListWidgetItem *item) {
            QKeyEvent keyPress(QEvent::KeyPress, Qt::Key_unknown, Qt::NoModifier, item->text());
            QCoreApplication::sendEvent(mInputWidget, &keyPress);
            listWidget->clear();
            mEdit->clear();
        });
    }
    VirtualKeyBoard::~VirtualKeyBoard() {
    }
    bool VirtualKeyBoard::issingleChar(QString spell) {
        bool ret = true;
        for (auto s: spell) {
            if (s != spell[0]) {
                ret = false;
                break;
            }
        }
        return ret;
    }
    void VirtualKeyBoard::setEdit(QWidget *edit) {
        this->mInputWidget = edit;
        this->mInputWidget->installEventFilter(this);
    }
    void VirtualKeyBoard::getCandidateList(const QString spell) {
        unsigned int cand = mCore->search(spell);
        if (cand == 0) {
            return;
        }
        QStringList ret = mCore->get_candidate(cand);
        if (ret.isEmpty()) {
            return;
        }
        listWidget->clear();
        listWidget->addItems(ret);
    }
    void VirtualKeyBoard::handleKeyPress(KeyButton *button) {
        if (mState == Chinese) {
            if (button->mKey != Qt::Key_Backspace) {
                mEdit->insert(button->mText);
            } else {
                if (!mEdit->text().isEmpty()) {
                    mEdit->backspace();
                } else {
                    listWidget->clear();
                    QKeyEvent keyPress(QEvent::KeyPress, button->mKey, button->modifiers, button->mText);
                    QCoreApplication::sendEvent(mInputWidget, &keyPress);
                }
            }
        } else {
            if (button->isText) {
                QKeyEvent keyPress(QEvent::KeyPress, button->mKey, button->modifiers, button->mText);
                if(mInputWidget) {
                    QCoreApplication::sendEvent(mInputWidget, &keyPress);
                } else
                {
                    qWarning("VirtualKeyBoard mInputWidget == NULL!");
                }
            }
        }
    }
    bool VirtualKeyBoard::eventFilter(QObject *watched, QEvent *event) {
        bool ok = false;
        if (QApplication::focusWidget() == watched && event->type() == QEvent::MouseButtonRelease) {
            ok = true;
        }
        if (event->type() == QEvent::FocusIn) {
            ok = true;
        }
        if (ok) {
            QWidget *w = qobject_cast<QWidget *>(watched);
            setEdit(w);
            QPoint pos = w->mapToGlobal(QPoint(0, 0));
            QSize screenSize = QGuiApplication::primaryScreen()->size();
            int keyboardWidth = width();
            int keyboardHeight = height();
            int screenWidth = screenSize.width();
            int screenHeight = screenSize.height();
            int x = pos.x();
            int y = pos.y() + w->height();
            if (x + keyboardWidth > screenWidth) {
                setFixedWidth(screenWidth - pos.x() - w->width());
            }
            if (y + keyboardHeight > screenHeight) {
                setFixedHeight(screenHeight - pos.y() - w->height());
            }
            move(x, y);
            show();
        }
        if (event->type() == QEvent::FocusOut) {
            this->hide();
        }
        return QObject::eventFilter(watched, event);
    }
    void VirtualKeyBoard::mousePressEvent(QMouseEvent *event) {
        if (mMoving) return;
        if (event->button() == Qt::LeftButton) {
            mMoving = true;
            mStartPos = pos();
            mStartGlobalPos = event->globalPos();
            QApplication::setOverrideCursor(Qt::ClosedHandCursor);
        }
        event->accept();
    }
    void VirtualKeyBoard::mouseMoveEvent(QMouseEvent *event) {
        if (!mMoving) return;
        move(mStartPos + event->globalPos() - mStartGlobalPos);
        event->accept();
    }
    void VirtualKeyBoard::mouseReleaseEvent(QMouseEvent *event) {
        if (!mMoving) return;
        mMoving = false;
        event->accept();
        QApplication::restoreOverrideCursor();
    }
}