#include "hmieditorwidget.h"
#include "hmiwidgetfactory.h"
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QDebug>
#include <QKeyEvent>
#include <QMouseEvent>
#include <QMenu>
#include <QTimer>
#include <QCoreApplication>
#include <QMetaObject>
#include "hmicontrolitem.h"

HmiEditorWidget::HmiEditorWidget(QWidget* parent)
    : QWidget(parent)
{
    QHBoxLayout* mainLayout = new QHBoxLayout(this);
    mainLayout->setContentsMargins(10, 10, 10, 10);
    mainLayout->setSpacing(10);

    QVBoxLayout* leftLayout = new QVBoxLayout();
    leftLayout->setSpacing(5);

    hmiToolbar = new QListWidget(this);
    hmiToolbar->setViewMode(QListWidget::IconMode);
    hmiToolbar->setIconSize(QSize(48, 48));
    hmiToolbar->setFixedWidth(100);
    hmiToolbar->setSpacing(10);
    hmiToolbar->setDragEnabled(false);

    QListWidgetItem* buttonItem = new QListWidgetItem();
    buttonItem->setIcon(QIcon(":resource/image/button.png"));
    buttonItem->setData(Qt::UserRole, QString("按钮"));
    buttonItem->setToolTip("按钮");
    hmiToolbar->addItem(buttonItem);

    QListWidgetItem* ledItem = new QListWidgetItem();
    ledItem->setIcon(QIcon(":resource/image/light.png"));
    ledItem->setData(Qt::UserRole, QString("指示灯"));
    ledItem->setToolTip("指示灯");
    hmiToolbar->addItem(ledItem);

    leftLayout->addWidget(hmiToolbar);

    m_newPageButton = new QPushButton("新建页面", this);
    m_deletePageButton = new QPushButton("删除页面", this);
    m_prevPageButton = new QPushButton("上一页", this);
    m_nextPageButton = new QPushButton("下一页", this);
    m_pageLabel = new QLabel("无页面", this);

    leftLayout->addWidget(m_newPageButton);
    leftLayout->addWidget(m_deletePageButton);
    leftLayout->addWidget(m_prevPageButton);
    leftLayout->addWidget(m_nextPageButton);
    leftLayout->addWidget(m_pageLabel);
    leftLayout->addStretch();

    mainLayout->addLayout(leftLayout);

    hmiEditArea = new QGraphicsView(this);
    hmiEditArea->setRenderHint(QPainter::Antialiasing);
    hmiEditArea->setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
    hmiEditArea->setOptimizationFlags(QGraphicsView::DontSavePainterState | QGraphicsView::DontAdjustForAntialiasing);
    hmiEditArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    hmiEditArea->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    mainLayout->addWidget(hmiEditArea, 1);

    hmiEditArea->installEventFilter(this);

    connect(hmiToolbar, &QListWidget::itemClicked, this, &HmiEditorWidget::onToolbarItemClicked);
    connect(m_newPageButton, &QPushButton::clicked, this, &HmiEditorWidget::onNewPageClicked);
    connect(m_deletePageButton, &QPushButton::clicked, this, &HmiEditorWidget::onDeletePageClicked);
    connect(m_prevPageButton, &QPushButton::clicked, this, &HmiEditorWidget::onPreviousPageClicked);
    connect(m_nextPageButton, &QPushButton::clicked, this, &HmiEditorWidget::onNextPageClicked);

    ensureViewReady();
}

HmiEditorWidget::~HmiEditorWidget()
{
    clearPages();
}

void HmiEditorWidget::ensureViewReady()
{
    QCoreApplication::processEvents();
    hmiEditArea->resetTransform();
    hmiEditArea->viewport()->update();

    if (hmiEditArea->viewport()->rect().isEmpty()) {
        hmiEditArea->setFixedSize(600, 400);
        QCoreApplication::processEvents();
    }
}

void HmiEditorWidget::showEvent(QShowEvent* event)
{
    QWidget::showEvent(event);
    if (m_firstShow && m_pages.isEmpty()) {
        m_firstShow = false;
        createNewPage();
    }
}

void HmiEditorWidget::createNewPage()
{
    QGraphicsScene* newScene = new QGraphicsScene(this);
    QRect viewRect = hmiEditArea->viewport()->rect();

    if (viewRect.isEmpty()) {
        viewRect = QRect(0, 0, 800, 600);
        hmiEditArea->setSceneRect(viewRect);
    }

    newScene->setSceneRect(viewRect);
    m_pages.append(newScene);
    m_currentPageIndex = m_pages.size() - 1;

    QMetaObject::invokeMethod(this, [this, newScene]() {
        hmiEditArea->setScene(newScene);
        initViewScale();
        updatePageLabel();
        hmiEditArea->viewport()->update();
    }, Qt::QueuedConnection);
}

void HmiEditorWidget::refreshView()
{
    if (m_currentPageIndex >= 0 && !m_pages.isEmpty()) {
        hmiEditArea->setScene(nullptr);
        hmiEditArea->setScene(m_pages[m_currentPageIndex]);
        initViewScale();
        hmiEditArea->viewport()->update();
    }
}

void HmiEditorWidget::initViewScale()
{
    if (!hmiEditArea || m_currentPageIndex < 0 || m_pages.isEmpty()) {
        return;
    }

    QRect viewRect = hmiEditArea->viewport()->rect();
    if (viewRect.isEmpty()) {
        viewRect = QRect(0, 0, 800, 600);
    }

    QGraphicsScene* currentScene = m_pages[m_currentPageIndex];
    currentScene->setSceneRect(viewRect);
    hmiEditArea->fitInView(viewRect, Qt::KeepAspectRatio);
    hmiEditArea->viewport()->update();
}

void HmiEditorWidget::updatePageLabel()
{
    if (m_pages.isEmpty()) {
        m_pageLabel->setText("无页面");
        m_deletePageButton->setEnabled(false);
        m_prevPageButton->setEnabled(false);
        m_nextPageButton->setEnabled(false);
    } else {
        m_pageLabel->setText(QString("第 %1/%2 页").arg(m_currentPageIndex + 1).arg(m_pages.size()));
        m_deletePageButton->setEnabled(m_pages.size() > 1);
        m_prevPageButton->setEnabled(m_currentPageIndex > 0);
        m_nextPageButton->setEnabled(m_currentPageIndex < m_pages.size() - 1);
    }
}

void HmiEditorWidget::switchToPage(int index)
{
    if (index >= 0 && index < m_pages.size()) {
        m_currentPageIndex = index;
        hmiEditArea->resetTransform();
        hmiEditArea->setScene(m_pages[index]);

        QRectF sceneRect = m_pages[index]->sceneRect();
        if (!sceneRect.isEmpty()) {
            hmiEditArea->fitInView(sceneRect, Qt::KeepAspectRatio);
        }

        updatePageLabel();
        QMetaObject::invokeMethod(this, [this]() {
            hmiEditArea->viewport()->update();
        }, Qt::QueuedConnection);
    }
}

bool HmiEditorWidget::eventFilter(QObject* obj, QEvent* event)
{
    if (obj == hmiEditArea && event->type() == QEvent::ContextMenu) {
        QContextMenuEvent* contextEvent = static_cast<QContextMenuEvent*>(event);
        if (m_currentPageIndex >= 0 && m_pages[m_currentPageIndex]) {
            QGraphicsItem* item = hmiEditArea->itemAt(contextEvent->pos());
            if (!item) {
                QMenu menu;
                QAction* pasteAction = new QAction("粘贴", &menu);
                pasteAction->setEnabled(HmiControlItem::hasClipboardData());
                QObject::connect(pasteAction, &QAction::triggered, [this, contextEvent]() {
                    if (m_currentPageIndex >= 0 && m_pages[m_currentPageIndex] && HmiControlItem::hasClipboardData()) {
                        QPointF scenePos = hmiEditArea->mapToScene(contextEvent->pos());
                        HmiControlItem* newItem = HmiControlItem::createFromClipboard(HmiControlItem::getClipboardData(), scenePos);
                        if (newItem) {
                            m_pages[m_currentPageIndex]->addItem(newItem);
                            m_pages[m_currentPageIndex]->clearSelection();
                            newItem->setSelected(true);
                            hmiEditArea->viewport()->update();
                        }
                    }
                });
                menu.addAction(pasteAction);
                menu.exec(contextEvent->globalPos());
            }
        }
        return true;
    }
    return QWidget::eventFilter(obj, event);
}

void HmiEditorWidget::resizeEvent(QResizeEvent* event)
{
    QWidget::resizeEvent(event);
    if (m_currentPageIndex >= 0 && !m_pages.isEmpty()) {
        initViewScale();
    }
}

void HmiEditorWidget::keyPressEvent(QKeyEvent* event)
{
    if (event->matches(QKeySequence::Copy)) {
        if (m_currentPageIndex >= 0 && m_pages[m_currentPageIndex]) {
            auto selectedItems = m_pages[m_currentPageIndex]->selectedItems();
            if (!selectedItems.isEmpty()) {
                HmiControlItem* item = dynamic_cast<HmiControlItem*>(selectedItems.first());
                if (item) {
                    HmiControlItem::copyToClipboard(item->saveToClipboard());
                }
            }
        }
    }
    else if (event->matches(QKeySequence::Paste)) {
        if (m_currentPageIndex >= 0 && m_pages[m_currentPageIndex] && HmiControlItem::hasClipboardData()) {
            QRectF sceneRect = m_pages[m_currentPageIndex]->sceneRect();
            QPointF centerPos(sceneRect.width() / 2, sceneRect.height() / 2);
            HmiControlItem* newItem = HmiControlItem::createFromClipboard(HmiControlItem::getClipboardData(), centerPos);
            if (newItem) {
                m_pages[m_currentPageIndex]->addItem(newItem);
                m_pages[m_currentPageIndex]->clearSelection();
                newItem->setSelected(true);
                hmiEditArea->viewport()->update();
            }
        }
    }
    else if (event->matches(QKeySequence::Delete)) {
        if (m_currentPageIndex >= 0 && m_pages[m_currentPageIndex]) {
            auto selectedItems = m_pages[m_currentPageIndex]->selectedItems();
            for (QGraphicsItem* item : selectedItems) {
                HmiControlItem* controlItem = dynamic_cast<HmiControlItem*>(item);
                if (controlItem) {
                    controlItem->deleteItem();
                }
            }
            hmiEditArea->viewport()->update();
        }
    }
    QWidget::keyPressEvent(event);
}

void HmiEditorWidget::onToolbarItemClicked(QListWidgetItem* item)
{
    if (!item || m_currentPageIndex < 0 || !m_pages[m_currentPageIndex]) return;

    QString type = item->data(Qt::UserRole).toString();
    HmiControlItem* newItem = nullptr;
    if (type == "按钮") {
        newItem = new HmiButton();
    } else if (type == "指示灯") {
        newItem = new HmiLed();
    }

    if (newItem) {
        QRectF sceneRect = m_pages[m_currentPageIndex]->sceneRect();
        newItem->setPos(sceneRect.width() / 2, sceneRect.height() / 2);
        m_pages[m_currentPageIndex]->addItem(newItem);
        m_pages[m_currentPageIndex]->clearSelection();
        newItem->setSelected(true);
        hmiEditArea->viewport()->update();
    }
}

void HmiEditorWidget::onNewPageClicked()
{
    createNewPage();
}

void HmiEditorWidget::onDeletePageClicked()
{
    if (m_currentPageIndex >= 0 && m_pages.size() > 1) {
        QGraphicsScene* scene = m_pages[m_currentPageIndex];
        m_pages.removeAt(m_currentPageIndex);
        delete scene;
        m_currentPageIndex = qMin(m_currentPageIndex, m_pages.size() - 1);
        hmiEditArea->setScene(m_pages[m_currentPageIndex]);
        initViewScale();
        updatePageLabel();
        hmiEditArea->viewport()->update();
    }
}

void HmiEditorWidget::onPreviousPageClicked()
{
    switchToPage(m_currentPageIndex - 1);
}

void HmiEditorWidget::onNextPageClicked()
{
    switchToPage(m_currentPageIndex + 1);
}

void HmiEditorWidget::clearPages()
{
    for (QGraphicsScene* scene : m_pages) {
        delete scene;
    }
    m_pages.clear();
    m_currentPageIndex = -1;
    hmiEditArea->setScene(nullptr);
    updatePageLabel();
}