#pragma once

#include <QApplication>

#include "MutiSelectRect.h"
#include "Plot.h"
#include "../Axis/AbsAxis.h"

namespace YSG {
    struct MutiSelectRectRenderState : YSG::RenderState {
        QVector<QRectF> mRects;
        QFont mFont;
        QPen mBorderPen, mFontPen = QPen(Qt::white);
        QBrush mRectBrush = QColor(0, 0, 255, 50);
        AbsAxis *mHorizontalAxis{}, *mVerticalAxis{};

        MutiSelectRectRenderState() {
            // NoPen,
            // SolidLine,
            // DashLine,
            // DotLine,
            // DashDotLine,
            // DashDotDotLine,
            // CustomDashLine
            mBorderPen.setStyle(Qt::DashLine);
            mBorderPen.setColor(Qt::white);
        }
    };

    struct MutiSelectRectTempData : YSG::TempData {

    };

    struct MutiSelectRectPrivate : YSG::RenderData {
        D_Ptr(MutiSelectRect)

        bool mActive = false;
    protected:

        bool selectTest(const QPointF& pos) override {
            return true;
        }

        // event->button()：返回引发该事件的单个鼠标按钮。通常在 mousePressEvent 和 mouseReleaseEvent 中使用。
        // event->buttons()：返回一个标志，指示当前按下的所有鼠标按钮。可以在任何鼠标事件中使用，特别是 mouseMoveEvent 中。
        void mousePressEvent(QMouseEvent* event) override {
            if (event->button() != Qt::LeftButton) return;
            MutiSelectRectRenderState* sc = editState();
            SpinLockGuard _guard(&mBufferLock);
            RenderEditGuard _editGuard(this);
            QVector<QRectF> &rectList = sc->mRects;
            if (!(QApplication::keyboardModifiers() & Qt::ControlModifier)) {
                rectList.clear();
            } else {
                int n = rectList.size();
                for (int i = n - 1; i >= 0; i--) {
                    auto &rect = rectList[i];
                    if (qFuzzyCompare(rect.width(), 0.0) || qFuzzyCompare(rect.height(), 0.0)) {
                        rectList.removeAt(i);
                    }
                }
            }
            double x = sc->mHorizontalAxis->pixelToCoord(event->pos().x(), SRC::Render);
            double y = sc->mVerticalAxis->pixelToCoord(event->pos().y(), SRC::Render);
            rectList.append(QRectF(QPointF(x, y), QPointF(x, y)));
            mActive = true;
        }

        void mouseMoveEvent(QMouseEvent* event) override {
            if(!(event->buttons() & Qt::LeftButton)) return;
            MutiSelectRectRenderState* sc = editState();
            SpinLockGuard _guard(&mBufferLock);
            RenderEditGuard _editGuard(this);
            QVector<QRectF> &rectList = sc->mRects;
            if (rectList.empty()) return;
            rectList.last().setBottomRight(event->pos());
            QRectF &r = rectList.last();
            r.setRight(sc->mHorizontalAxis->pixelToCoord(r.right(), SRC::Render));
            r.setBottom(sc->mVerticalAxis->pixelToCoord(r.bottom(), SRC::Render));
        }

        void mouseReleaseEvent(QMouseEvent* event) override {}

        void keyPressEvent(QKeyEvent* event) override {
            if (event->key() != Qt::Key_Escape || !mActive) return;
            MutiSelectRectRenderState* sc = editState();
            SpinLockGuard _guard(&mBufferLock);
            RenderEditGuard _editGuard(this);
            mActive = false;
            QVector<QRectF> &rectList = sc->mRects;
            if (rectList.empty()) return;
            rectList.removeLast();
        }

        void keyReleaseEvent(QKeyEvent* event) override {
            MutiSelectRectRenderState* sc = editState();
            MutiSelectRectTempData* td = editTempData();
            SpinLockGuard _guard(&mBufferLock);
        }


        void draw(QPainter* painter) override {
            if(!mActive) return;
            MutiSelectRectRenderState* s = renderState();
            QList<QRectF> drawRectList;
            for (QRectF r: s->mRects) {
                if (qFuzzyCompare(r.width(), 0.0) || qFuzzyCompare(r.height(), 0.0)) continue;
                r.setX(s->mHorizontalAxis->coordToPixel(r.x(), SRC::Render));
                r.setY(s->mVerticalAxis->coordToPixel(r.y(), SRC::Render));
                r.setRight(s->mHorizontalAxis->coordToPixel(r.right(), SRC::Render));
                r.setBottom(s->mVerticalAxis->coordToPixel(r.bottom(), SRC::Render));
                drawRectList.append(r);
            }
            painter->save();
            QFontMetrics xfm(s->mHorizontalAxis->unitTextFont());
            QFontMetrics yfm(s->mVerticalAxis->unitTextFont());
            painter->setPen(s->mBorderPen);
            painter->setBrush(s->mRectBrush);
            for (auto &rect: drawRectList) {
                painter->drawRect(rect);
            }
            painter->setPen(s->mFontPen);
            painter->setFont(s->mFont);
            int n = drawRectList.size();
            for (int i = 0; i < n; ++i) {
                QRectF &rect = drawRectList[i];
                QRectF &coordRect = s->mRects[i];
                double OffsetX = coordRect.right() - coordRect.left();
                double OffsetY = coordRect.bottom() - coordRect.top();
                QString text1 = "OffsetX == " + QString::number(OffsetX) + s->mHorizontalAxis->unitText();
                QString text2 = "OffsetY == " + QString::number(OffsetY) + s->mVerticalAxis->unitText();
                double width1 = xfm.horizontalAdvance(text1) + 32;
                double width2 = yfm.horizontalAdvance(text2) + 32;
                double rect1X = rect.x() + rect.width() / 2 - width1 / 2;
                double rect2X = rect.x() + rect.width() / 2 - width2 / 2;
                QRectF rect1 = QRectF(rect1X, rect.y(), width1, xfm.lineSpacing());
                QRectF rect2 = QRectF(rect2X, rect1.bottom(), width2, yfm.lineSpacing());
                painter->drawText(rect1, Qt::AlignCenter, text1);
                painter->drawText(rect2, Qt::AlignCenter, text2);
            }
            painter->restore();
        }
    };

}