#include "document.h"
#include "graphicsitems.h"
#include <QGraphicsItem>
#include <QGraphicsSceneHoverEvent>
#include <QMouseEvent>
#include <QMenu>
#include <QAction>
#include <QDataStream>
#include <QColorDialog>
#include <QDialog>
#include <QFormLayout>
#include <QLineEdit>
#include <QPushButton>
#include <QDialogButtonBox>
#include <QMimeData>
#include <QDragEnterEvent>
#include <QDropEvent>
#include <QDebug>

HMIDocument::HMIDocument(QWidget *parent)
    : BaseDocument(HMI, parent),
      m_title("未命名HMI"),
      m_canDrawEllipse(false),
      m_canDrawRectangle(false),
      m_lastPastePos(0, 0)
{
    // 创建绘图场景
    m_scene = new QGraphicsScene(this);
    m_scene->setSceneRect(0, 0, 800, 600);
    m_scene->setBackgroundBrush(QBrush(Qt::lightGray));

    // 创建视图
    m_view = new QGraphicsView(m_scene, this);
    m_view->setRenderHint(QPainter::Antialiasing);
    m_view->setDragMode(QGraphicsView::RubberBandDrag);
    m_view->setAcceptDrops(true);
    m_view->viewport()->installEventFilter(this);

    // 布局（让视图占满文档区域）
    auto layout = new QVBoxLayout(this);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->addWidget(m_view);
    setLayout(layout);
}

HMIDocument::~HMIDocument()
{
}

// 事件过滤器（处理绘图、拖拽等事件）
bool HMIDocument::eventFilter(QObject *obj, QEvent *event)
{
    if (obj != m_view->viewport()) {
        return QWidget::eventFilter(obj, event);
    }

    // 鼠标按下事件（绘制图形）
    if (event->type() == QEvent::MouseButtonPress)
    {
        QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);

        if (mouseEvent->button() == Qt::RightButton)
        {
            // 右键菜单
            showContextMenu(mouseEvent->globalPos());
            return true;
        }
        if (mouseEvent->button() == Qt::LeftButton)
        {
            QPointF scenePos = m_view->mapToScene(mouseEvent->pos());
            QGraphicsItem *item = m_scene->itemAt(scenePos, m_view->transform());

            // 如果点击空白区域且有绘制标志，创建图形
            if (!item) {
                if (m_canDrawEllipse) {
                    createEllipse(scenePos);
                    resetDrawFlags();
                } else if (m_canDrawRectangle) {
                    createRectangle(scenePos);
                    resetDrawFlags();
                }
                m_scene->clearSelection(); // 清除选择
                return true;
            }
        }
    }

    // 拖拽事件（从工具栏拖拽绘制）
    if (event->type() == QEvent::DragEnter) {
        QDragEnterEvent *dragEvent = static_cast<QDragEnterEvent*>(event);
        dragEvent->acceptProposedAction();
        return true;
    }
    if (event->type() == QEvent::DragMove) {
        static_cast<QDragMoveEvent*>(event)->acceptProposedAction();
        return true;
    }
    if (event->type() == QEvent::Drop) {
        QDropEvent *dropEvent = static_cast<QDropEvent*>(event);
        const QMimeData *mimeData = dropEvent->mimeData(); // 显式获取mimeData
        QPointF scenePos = m_view->mapToScene(dropEvent->pos());

        // 使用QMimeData
        if (mimeData && mimeData->hasText()) {
            QString type = mimeData->text();
            if (type == "指示灯") {
                createEllipse(scenePos);
            } else if (type == "按钮") {
                createRectangle(scenePos);
            }
        }
        dropEvent->acceptProposedAction();
        return true;
    }

    return QWidget::eventFilter(obj, event);
}

// 创建椭圆（指示灯）
void HMIDocument::createEllipse(const QPointF &pos)
{
    ResizableEllipse *ellipse = new ResizableEllipse(pos.x(), pos.y(), 50, 50);
    ellipse->setBrush(QBrush(Qt::red));
    ellipse->setPen(QPen(Qt::black, 1));
    m_scene->addItem(ellipse);
    ellipse->setSelected(true);
}

// 创建矩形（按钮）
void HMIDocument::createRectangle(const QPointF &pos)
{
    ResizableRectangle *rect = new ResizableRectangle(pos.x(), pos.y(), 100, 50);
    rect->setBrush(QBrush(Qt::yellow));
    rect->setPen(QPen(Qt::black, 1));
    m_scene->addItem(rect);
    rect->setSelected(true);
}

// 重置绘制标志
void HMIDocument::resetDrawFlags()
{
    m_canDrawEllipse = false;
    m_canDrawRectangle = false;
}

// 右键菜单
void HMIDocument::showContextMenu(QPoint globalPos)
{
    QPoint viewportPos = m_view->mapFromGlobal(globalPos);
    QPointF scenePos = m_view->mapToScene(viewportPos);
    QGraphicsItem *clickedItem = m_scene->itemAt(scenePos, m_view->transform());

    QMenu menu(this);

    if (!clickedItem) {
        // 空白区域：仅显示粘贴
        QAction *pasteAction = menu.addAction("粘贴");
        pasteAction->setEnabled(!m_copiedItemsData.isEmpty());
        connect(pasteAction, &QAction::triggered, this, &HMIDocument::pasteItems);
    } else {
        // 选中图形：显示完整菜单
        QAction *propAction = menu.addAction("属性");
        QAction *copyAction = menu.addAction("复制");
        QAction *pasteAction = menu.addAction("粘贴");
        QAction *deleteAction = menu.addAction("删除");
        QAction *onAction = menu.addAction("置为ON");
        QAction *offAction = menu.addAction("置为OFF");

        pasteAction->setEnabled(!m_copiedItemsData.isEmpty());

        connect(propAction, &QAction::triggered, this, &HMIDocument::showItemProperties);
        connect(copyAction, &QAction::triggered, this, &HMIDocument::copySelectedItems);
        connect(pasteAction, &QAction::triggered, this, &HMIDocument::pasteItems);
        connect(deleteAction, &QAction::triggered, this, &HMIDocument::deleteSelectedItems);

        // ON/OFF动作（针对指示灯和按钮）
        connect(onAction, &QAction::triggered, [=]() {
            if (auto ellipse = dynamic_cast<ResizableEllipse*>(clickedItem)) {
                ellipse->setBrush(ellipse->onColor());
            } else if (auto rect = dynamic_cast<ResizableRectangle*>(clickedItem)) {
                rect->setBrush(rect->pressedColor());
            }
        });
        connect(offAction, &QAction::triggered, [=]() {
            if (auto ellipse = dynamic_cast<ResizableEllipse*>(clickedItem)) {
                ellipse->setBrush(ellipse->offColor());
            } else if (auto rect = dynamic_cast<ResizableRectangle*>(clickedItem)) {
                rect->setBrush(rect->releasedColor());
            }
        });
    }

    menu.exec(globalPos + QPoint(10, 10));
}

// 复制选中项
void HMIDocument::copySelectedItems()
{
    m_copiedItemsData.clear();
    QList<QGraphicsItem*> selectedItems = m_scene->selectedItems();
    if (selectedItems.isEmpty()) return;

    foreach (QGraphicsItem *item, selectedItems) {
        m_copiedItemsData.append(serializeItem(item));
    }
    m_lastPastePos = selectedItems.first()->pos();
}

// 粘贴项
void HMIDocument::pasteItems()
{
    if (m_copiedItemsData.isEmpty()) return;

    QPointF offset(20, 20);
    m_lastPastePos += offset;
    m_scene->clearSelection();

    foreach (const QByteArray &itemData, m_copiedItemsData) {
        QGraphicsItem *newItem = deserializeItem(itemData);
        if (newItem) {
            m_scene->addItem(newItem);
            newItem->setPos(m_lastPastePos);
            newItem->setSelected(true);
        }
    }
}

// 删除选中项
void HMIDocument::deleteSelectedItems()
{
    QList<QGraphicsItem*> selectedItems = m_scene->selectedItems();
    foreach (QGraphicsItem *item, selectedItems) {
        m_scene->removeItem(item);
        delete item;
    }
}

// 显示属性对话框
void HMIDocument::showItemProperties()
{
    QList<QGraphicsItem*> selectedItems = m_scene->selectedItems();
    if (selectedItems.isEmpty()) return;
    QGraphicsItem *item = selectedItems.first();

    // 将QGraphicsItem转换为NamedItem
    NamedItem *namedItem = dynamic_cast<NamedItem*>(item);
    if (!namedItem) return;

    QDialog dialog(this);
    dialog.setWindowTitle("属性设置");
    QFormLayout *form = new QFormLayout(&dialog);

    // 名称输入 - 使用NamedItem接口
    QLineEdit *nameEdit = new QLineEdit(namedItem->name());

    // 颜色选择（根据图形类型）
    QColor tempColor1, tempColor2;
    QPushButton *colorBtn1 = new QPushButton;
    QPushButton *colorBtn2 = new QPushButton;

    if (auto ellipse = dynamic_cast<ResizableEllipse*>(item)) {
        tempColor1 = ellipse->onColor();
        tempColor2 = ellipse->offColor();
        form->addRow("ON颜色:", colorBtn1);
        form->addRow("OFF颜色:", colorBtn2);
    } else if (auto rect = dynamic_cast<ResizableRectangle*>(item)) {
        tempColor1 = rect->pressedColor();
        tempColor2 = rect->releasedColor();
        form->addRow("按下颜色:", colorBtn1);
        form->addRow("释放颜色:", colorBtn2);
    }

    // 初始化颜色按钮
    colorBtn1->setStyleSheet("background-color:" + tempColor1.name());
    colorBtn2->setStyleSheet("background-color:" + tempColor2.name());

    // 颜色选择对话框
    connect(colorBtn1, &QPushButton::clicked, [&]() {
        QColor c = QColorDialog::getColor(tempColor1, &dialog);
        if (c.isValid()) {
            tempColor1 = c;
            colorBtn1->setStyleSheet("background-color:" + c.name());
        }
    });
    connect(colorBtn2, &QPushButton::clicked, [&]() {
        QColor c = QColorDialog::getColor(tempColor2, &dialog);
        if (c.isValid()) {
            tempColor2 = c;
            colorBtn2->setStyleSheet("background-color:" + c.name());
        }
    });

    // 布局组装
    form->addRow("名称:", nameEdit);
    QDialogButtonBox *btnBox = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
    form->addRow(btnBox);
    connect(btnBox, &QDialogButtonBox::accepted, &dialog, &QDialog::accept);
    connect(btnBox, &QDialogButtonBox::rejected, &dialog, &QDialog::reject);

    // 应用属性
    if (dialog.exec() == QDialog::Accepted) {
        // 使用NamedItem接口设置名称
        namedItem->setName(nameEdit->text());

        if (auto ellipse = dynamic_cast<ResizableEllipse*>(item)) {
            ellipse->setOnColor(tempColor1);
            ellipse->setOffColor(tempColor2);
        } else if (auto rect = dynamic_cast<ResizableRectangle*>(item)) {
            rect->setPressedColor(tempColor1);
            rect->setReleasedColor(tempColor2);
        }
        item->update();
    }
}

// 序列化图形项（用于复制粘贴）
QByteArray HMIDocument::serializeItem(QGraphicsItem *item)
{
    QByteArray data;
    QDataStream stream(&data, QIODevice::WriteOnly);

    // 基础信息
    stream << item->type();
    stream << item->pos();
    stream << item->flags();
    stream << item->transform();
    stream << item->isVisible();

    // 形状信息
    if (auto shape = dynamic_cast<QAbstractGraphicsShapeItem*>(item)) {
        stream << shape->pen();
        stream << shape->brush();
        stream << shape->boundingRect();
    }

    // 具体图形信息
    if (auto rect = dynamic_cast<ResizableRectangle*>(item)) {
        stream << rect->rect();
        stream << rect->pressedColor();
        stream << rect->releasedColor();
        stream << rect->name();
    } else if (auto ellipse = dynamic_cast<ResizableEllipse*>(item)) {
        stream << ellipse->rect();
        stream << ellipse->onColor();
        stream << ellipse->offColor();
        stream << ellipse->name();
    }

    return data;
}

// 反序列化图形项（用于粘贴）
QGraphicsItem *HMIDocument::deserializeItem(const QByteArray &data)
{
    QDataStream stream(data);
    int type;
    QPointF pos;
    QGraphicsItem::GraphicsItemFlags flags;
    QTransform transform;
    bool visible;

    stream >> type >> pos >> flags >> transform >> visible;

    QGraphicsItem *item = nullptr;
    if (type == QGraphicsRectItem::Type) {
        QPen pen;
        QBrush brush;
        QRectF boundRect;
        QRectF rect;
        QColor pressedColor, releasedColor;
        QString name;

        stream >> pen >> brush >> boundRect >> rect >> pressedColor >> releasedColor >> name;

        ResizableRectangle *rectItem = new ResizableRectangle(0, 0, rect.width(), rect.height());
        rectItem->setPen(pen);
        rectItem->setBrush(brush);
        rectItem->setPressedColor(pressedColor);
        rectItem->setReleasedColor(releasedColor);
        rectItem->setName(name);
        item = rectItem;
    } else if (type == QGraphicsEllipseItem::Type) {
        QPen pen;
        QBrush brush;
        QRectF boundRect;
        QRectF rect;
        QColor onColor, offColor;
        QString name;

        stream >> pen >> brush >> boundRect >> rect >> onColor >> offColor >> name;

        ResizableEllipse *ellipseItem = new ResizableEllipse(0, 0, rect.width(), rect.height());
        ellipseItem->setPen(pen);
        ellipseItem->setBrush(brush);
        ellipseItem->setOnColor(onColor);
        ellipseItem->setOffColor(offColor);
        ellipseItem->setName(name);
        item = ellipseItem;
    }

    if (item) {
        item->setFlags(flags);
        item->setTransform(transform);
        item->setVisible(visible);
    }

    return item;
}