#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "item.h"

#include <QListWidgetItem>
#include <QMimeData>
#include <QDrag>
#include <QPainter>
#include <QMouseEvent>
#include <QDropEvent>
#include <QGraphicsView>
#include <QMessageBox>
#include <QAction>
#include <QFileDialog>
#include "creatitem.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
    , registerManager(new RegisterManager(this))
    , modbusManager(new ModbusManager(registerManager, this))
{
    ui->setupUi(this);
//    registerManager = new RegisterManager(this);
//    modbusManager = new ModbusManager(registerManager, this);
    // 初始化PLC标签页
    ui->plc_tab_widget->setTabsClosable(true);
    ui->plc_tab_widget->setMovable(true);

    // 初始化HMI标签页
    ui->hmi_tab_widget->setTabsClosable(true);
    ui->hmi_tab_widget->setMovable(true);

    /* 2. 列表 */
    ui->listWidget->setViewMode(QListView::IconMode);
    ui->listWidget->setIconSize(QSize(60, 30));
    ui->listWidget->setDragEnabled(false);
    ui->listWidget->viewport()->installEventFilter(this);

    newPage(true);
    newPage(false);

    createComponents();

    connect(ui->plc_tab_widget, &QTabWidget::tabCloseRequested,this,&MainWindow::onTabCloseRequested);
    connect(ui->hmi_tab_widget, &QTabWidget::tabCloseRequested,this,&MainWindow::onTabCloseRequested);
    connect(ui->listWidget,&QListWidget::currentTextChanged,this,&MainWindow::onListwidgetCurrenttextchanged);

    connect(ui->action_plc,&QAction::triggered,this,&MainWindow::plcChange);
    connect(ui->action_hmi,&QAction::triggered,this,&MainWindow::hmiChange);

    connect(ui->action_new, &QAction::triggered, this, &MainWindow::newProject);
    connect(ui->action_save, &QAction::triggered, this, &MainWindow::saveProject);
    connect(ui->action_open, &QAction::triggered, this, &MainWindow::openProject);
    connect(ui->action_connect, &QAction::triggered, this, &MainWindow::connection);
    connect(ui->action_disconnect, &QAction::triggered, this, &MainWindow::disconnection);
    connect(ui->btn_insert, &QPushButton::clicked, this, &MainWindow::btnInsertClicked);

    connect(modbusManager, &ModbusManager::connectionStatusChanged,
            this, &MainWindow::updateConnectionStatus);
    //    connect(modbusManager, &ModbusManager::connectionStatusChanged,
    //            this, &PLC::updateConnectionStatus);
    //    connect(modbusManager, &ModbusManager::errorOccurred,
    //            this, &PLC::handleModbusError);

    ui->stackedWidget->setCurrentIndex(0);
    setWindowTitle("未命名项目 - PLC编辑器");
}

MainWindow::~MainWindow()
{
    qDeleteAll(plcScenes);
    qDeleteAll(plcViews);
    qDeleteAll(hmiScenes);
    qDeleteAll(hmiViews);
    delete ui;
}

void MainWindow::newPage(bool isPlc)
{
    // 创建新场景
    QGraphicsScene* newScene = new QGraphicsScene(this);

    // 创建新视图
    MyGraphicsView* newView = new MyGraphicsView(this);
    newView->setScene(newScene);
    newView->setSceneRect(0, 0, 800, 600);
    newView->setDragMode(QGraphicsView::RubberBandDrag);

    if (isPlc) {
        // 添加到PLC标签页
        int newIndex = ui->plc_tab_widget->addTab(newView, QString("页面 %1").arg(plcScenes.size() + 1));
        ui->plc_tab_widget->setCurrentIndex(newIndex);

        // 保存场景和视图
        plcScenes.append(newScene);
        plcViews.append(newView);
        connect(newView, &MyGraphicsView::itemBoundToRegister,
                registerManager, &RegisterManager::bindItem);
        connect(newView, &MyGraphicsView::itemResetRegister,
                registerManager, &RegisterManager::unbindItem);
    } else {
        // 添加到HMI标签页
        int newIndex = ui->hmi_tab_widget->addTab(newView, QString("页面 %1").arg(hmiScenes.size() + 1));
        ui->hmi_tab_widget->setCurrentIndex(newIndex);

        // 保存场景和视图
        hmiScenes.append(newScene);
        hmiViews.append(newView);
        connect(newView, &MyGraphicsView::itemBoundToRegister,
                registerManager, &RegisterManager::bindItem);
        connect(newView, &MyGraphicsView::itemResetRegister,
                registerManager, &RegisterManager::unbindItem);
        connect(newView, &MyGraphicsView::itemSetON,
                modbusManager, &ModbusManager::writeRegister);
    }
}

void MainWindow::createComponents()
{
    ui->listWidget->clear();
    if (currentIsPLC_)
    {
        struct Comp { QString name; QColor color; };
        const QVector<Comp> comps = {
            {"常开",     Qt::blue},
            {"常闭",     Qt::red},
            {"比较", Qt::green},
            {"线圈",     Qt::darkYellow}
        };

        for (const Comp &c : comps) {
            QListWidgetItem *it = new QListWidgetItem(c.name, ui->listWidget);

            QPixmap pix(60, 30);
            pix.fill(Qt::white);
            QPainter p(&pix);
            p.setRenderHint(QPainter::Antialiasing);
            p.setBrush(c.color.lighter(150));
            p.setPen(QPen(c.color, 2));
            p.drawRoundedRect(QRect(5, 5, 50, 20), 3, 3);
            p.setPen(Qt::black);
            p.drawText(QRect(5, 5, 50, 20), Qt::AlignCenter, c.name);

            it->setIcon(QIcon(pix));
            it->setData(Qt::UserRole, c.name);
        }
    }
    else
    {
        struct Comp { QString name; QColor color; };
        const QVector<Comp> comps = {
            {"按钮",     Qt::blue},
            {"指示灯",     Qt::red}
        };

        for (const Comp &c : comps) {
            QListWidgetItem *it = new QListWidgetItem(c.name, ui->listWidget);

            QPixmap pix(60, 30);
            pix.fill(Qt::white);
            QPainter p(&pix);
            p.setRenderHint(QPainter::Antialiasing);
            p.setBrush(c.color.lighter(150));
            p.setPen(QPen(c.color, 2));
            p.drawRoundedRect(QRect(5, 5, 50, 20), 3, 3);
            p.setPen(Qt::black);
            p.drawText(QRect(5, 5, 50, 20), Qt::AlignCenter, c.name);

            it->setIcon(QIcon(pix));
            it->setData(Qt::UserRole, c.name);
        }
    }
}

void MainWindow::clearScene()
{
    if(currentIsPLC_)
    {
        if (currentPageIndex() >= 0 && currentPageIndex() < plcScenes.size()) {
            plcScenes[currentPageIndex()]->clear();
        }
    }
    else
    {
        if (currentPageIndex() >= 0 && currentPageIndex() < hmiScenes.size()) {
            hmiScenes[currentPageIndex()]->clear();
        }
    }
}

void MainWindow::applyProjectToScene(const Project &proj, int pageIndex)
{
    if (currentIsPLC_)
    {
        if (pageIndex < 0 || pageIndex >= plcScenes.size())
            return;

        plcScenes[pageIndex]->clear();
        QVector<Item*> itemObjs;
        for (const auto& d : proj.items_) {
            Item* item = creatItem(d.type);
            if (!item) continue;
            item->setPos(d.x, d.y);
            item->setRegisterId(d.registerId);
            connect(item, &Item::requestCopy, plcViews[pageIndex], &MyGraphicsView::onItemRequestCopy);
            connect(item, &Item::requestDelete, plcViews[pageIndex], &MyGraphicsView::onItemRequestDelete);
            connect(item, &Item::requestBindRegister, plcViews[pageIndex], &MyGraphicsView::onItemRequestBindRegister);
            connect(item, &Item::requestCompare, plcViews[pageIndex], &MyGraphicsView::onItemRequestCompare);
            connect(item, &Item::requestReset, plcViews[pageIndex], &MyGraphicsView::onItemRequestReset);
            connect(item, &Item::requestSetON,plcViews[pageIndex], &MyGraphicsView::onItemRequestSetON);
            plcScenes[pageIndex]->addItem(item);
            registerManager->bindItem(item,d.registerId);
            itemObjs.append(item);
        }
        for (const auto& c : proj.connections_) {
            if (c.from >= 0 && c.from < itemObjs.size() && c.to >= 0 && c.to < itemObjs.size()) {
                Connection* conn = new Connection(
                            itemObjs[c.from], static_cast<Item::AnchorType>(c.fromType),
                        itemObjs[c.to], static_cast<Item::AnchorType>(c.toType));
                plcScenes[pageIndex]->addItem(conn);
            }
        }
    }
    else
    {
        if (pageIndex < 0 || pageIndex >= hmiScenes.size())
            return;

        hmiScenes[pageIndex]->clear();
        QVector<Item*> itemObjs;
        for (const auto& d : proj.items_) {
            Item* item = creatItem(d.type);
            if (!item) continue;
            item->setPos(d.x, d.y);
            item->setRegisterId(d.registerId);
            connect(item, &Item::requestCopy, hmiViews[pageIndex], &MyGraphicsView::onItemRequestCopy);
            connect(item, &Item::requestDelete, hmiViews[pageIndex], &MyGraphicsView::onItemRequestDelete);
            connect(item, &Item::requestBindRegister, hmiViews[pageIndex], &MyGraphicsView::onItemRequestBindRegister);
            connect(item, &Item::requestCompare, hmiViews[pageIndex], &MyGraphicsView::onItemRequestCompare);
            connect(item, &Item::requestReset, hmiViews[pageIndex], &MyGraphicsView::onItemRequestReset);
            connect(item, &Item::requestSetON,hmiViews[pageIndex], &MyGraphicsView::onItemRequestSetON);
            hmiScenes[pageIndex]->addItem(item);
            registerManager->bindItem(item,d.registerId);
            itemObjs.append(item);
        }
    }
}

void MainWindow::extractSceneToProject(Project &proj, int pageIndex)
{
    if (currentIsPLC_)
    {
        if (pageIndex < 0 || pageIndex >= plcScenes.size()) return;
        proj.clear();
        QList<Item*> items;
        for (QGraphicsItem* gi : plcScenes[pageIndex]->items()){
            if (Item* it = dynamic_cast<Item*>(gi)){
                items.append(it);
            }
        }
        for (Item* it : items) {
            Project::ItemData d;
            d.type = it->itemType();
            d.x = it->pos().x();
            d.y = it->pos().y();
            d.registerId = it->registerId();
            proj.items_.append(d);
        }
        for (QGraphicsItem* gi : plcScenes[pageIndex]->items()) {
            if (Connection* conn = dynamic_cast<Connection*>(gi)) {
                int fromIdx = items.indexOf(conn->from_);
                int toIdx = items.indexOf(conn->to_);
                if (fromIdx >= 0 && toIdx >= 0) {
                    Project::ConnectionData c;
                    c.from = fromIdx;
                    c.to = toIdx;
                    c.fromType = static_cast<int>(conn->fromType_);
                    c.toType = static_cast<int>(conn->toType_);
                    proj.connections_.append(c);
                }
            }
        }
    }
    else
    {
        if (pageIndex < 0 || pageIndex >= hmiScenes.size()) return;
        proj.clear();
        QList<Item*> items;
        for (QGraphicsItem* gi : hmiScenes[pageIndex]->items()){
            if (Item* it = dynamic_cast<Item*>(gi)){
                items.append(it);
            }
        }
        for (Item* it : items) {
            Project::ItemData d;
            d.type = it->itemType();
            d.x = it->pos().x();
            d.y = it->pos().y();
            d.registerId = it->registerId();
            proj.items_.append(d);
        }
    }
}

int MainWindow::currentPageIndex() const
{
    if (currentIsPLC_) {
        return ui->plc_tab_widget->currentIndex();
    } else {
        return ui->hmi_tab_widget->currentIndex();
    }
}

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    if (obj == ui->listWidget->viewport()) {
        static QListWidgetItem *dragItem = nullptr;
        static QPoint startPos;

        if (event->type() == QEvent::MouseButtonPress) {
            auto *me = static_cast<QMouseEvent*>(event);
            if (me->button() == Qt::LeftButton) {
                dragItem  = ui->listWidget->itemAt(me->pos());
                startPos  = me->pos();
            }
        } else if (event->type() == QEvent::MouseMove && dragItem) {
            auto *me = static_cast<QMouseEvent*>(event);
            if ((me->pos() - startPos).manhattanLength()
                    >= QApplication::startDragDistance()) {

                QString type = dragItem->data(Qt::UserRole).toString();

                QMimeData *mime = new QMimeData;
                mime->setData("application/x-component", type.toUtf8());

                QDrag *drag = new QDrag(this);
                drag->setMimeData(mime);
                drag->setPixmap(dragItem->icon().pixmap(ui->listWidget->iconSize()));
                drag->setHotSpot(drag->pixmap().rect().center());
                drag->exec(Qt::CopyAction);

                dragItem = nullptr;
            }
        } else if (event->type() == QEvent::MouseButtonRelease) {
            dragItem = nullptr;
        }
    }
    return QWidget::eventFilter(obj, event);
}

void MainWindow::plcChange()
{
    currentIsPLC_ = true;
    createComponents();
    ui->stackedWidget->setCurrentIndex(0); // 显示PLC页面
//    setWindowTitle((plcFilePath_.isEmpty() ? "未命名项目" : QFileInfo(plcFilePath_).fileName()) + " - PLC编辑器");
}


void MainWindow::hmiChange()
{
    currentIsPLC_ = false;
    createComponents();
    ui->stackedWidget->setCurrentIndex(1); // 显示HMI页面
//    setWindowTitle((hmiFilePath_.isEmpty() ? "未命名项目" : QFileInfo(hmiFilePath_).fileName()) + " - HMI编辑器");
}

void MainWindow::newProject()
{
    newPage(currentIsPLC_);

    // 更新窗口标题
    if (currentIsPLC_) {
        setWindowTitle("未命名项目 - PLC编辑器");
    } else {
        setWindowTitle("未命名项目 - HMI编辑器");
    }
}

void MainWindow::openProject()
{
    QString filePath;
    QString filter;

    if (currentIsPLC_) {
        filter = "PLC项目文件 (*.plcproj)";
        filePath = QFileDialog::getOpenFileName(this, "打开PLC项目", "", filter);
    } else {
        filter = "HMI项目文件 (*.hmiproj)";
        filePath = QFileDialog::getOpenFileName(this, "打开HMI项目", "", filter);
    }

    if (filePath.isEmpty()) return;

    Project project;
    if (project.loadFromFile(filePath)) {
        // 在当前模块新建一个页面
        newPage(currentIsPLC_);
        int newPageIndex = currentPageIndex();

        // 将项目应用到新页面
        applyProjectToScene(project, newPageIndex);

        // 更新窗口标题
        setWindowTitle(QFileInfo(filePath).fileName() +
                      (currentIsPLC_ ? " - PLC编辑器" : " - HMI编辑器"));
    } else {
        QMessageBox::critical(this, "错误", "无法打开项目文件");
    }
}

void MainWindow::saveProject()
{
    QString filePath;
    QString filter;
    QString defaultSuffix;

    if (currentIsPLC_) {
        filter = "PLC项目文件 (*.plcproj)";
        defaultSuffix = "plcproj";
        filePath = QFileDialog::getSaveFileName(this, "保存PLC项目", "", filter);
    } else {
        filter = "HMI项目文件 (*.hmiproj)";
        defaultSuffix = "hmiproj";
        filePath = QFileDialog::getSaveFileName(this, "保存HMI项目", "", filter);
    }

    if (filePath.isEmpty()) return;

    // 确保文件有正确的扩展名
    if (!filePath.endsWith("." + defaultSuffix, Qt::CaseInsensitive)) {
        filePath += "." + defaultSuffix;
    }

    Project project;
    // 从当前页面提取项目
    extractSceneToProject(project, currentPageIndex());

    if (project.saveToFile(filePath)) {
        // 更新窗口标题
        setWindowTitle(QFileInfo(filePath).fileName() +
                      (currentIsPLC_ ? " - PLC编辑器" : " - HMI编辑器"));
    } else {
        QMessageBox::critical(this, "错误", "保存项目失败");
    }
}

void MainWindow::connection()
{
    modbusManager->connectToDevice("COM1",QSerialPort::BaudRate(9600),QSerialPort::DataBits(8),QSerialPort::EvenParity,QSerialPort::StopBits(1));
    modbusManager->startSimulation(1000);
}

void MainWindow::disconnection()
{
    modbusManager->disconnectDevice();
    modbusManager->stopSimulation();
}

void MainWindow::updateConnectionStatus(bool connection)
{
    if (connection)
    {
        ui->textEdit->append("连接");
    }
    else
    {
        ui->textEdit->append("断开");
    }
}

void MainWindow::onListwidgetCurrenttextchanged(const QString &currentText)
{
    selectedComponentType = currentText;
}

void MainWindow::onTabCloseRequested(int index)
{
    if (currentIsPLC_) {
        if (plcScenes.size() > 1) {
            delete plcScenes.takeAt(index);
            delete plcViews.takeAt(index);
            ui->plc_tab_widget->removeTab(index);
        } else {
            QMessageBox::information(this, "提示", "至少保留一个PLC页面");
        }
    } else {
        if (hmiScenes.size() > 1) {
            delete hmiScenes.takeAt(index);
            delete hmiViews.takeAt(index);
            ui->hmi_tab_widget->removeTab(index);
        } else {
            QMessageBox::information(this, "提示", "至少保留一个HMI页面");
        }
    }
}

void MainWindow::btnInsertClicked()
{
    // 1. 找场景中被选中的连线
       QList<QGraphicsItem*> selectedItems = plcScenes[currentPageIndex()]->selectedItems();
       Connection* selectedConn = nullptr;
       for (QGraphicsItem* item : selectedItems) {
           selectedConn = dynamic_cast<Connection*>(item);
           if (selectedConn) break;
       }
       if (!selectedConn) {
           QMessageBox::warning(this, "提示", "请先选中一条连线");
           return;
       }
       if (selectedComponentType.isEmpty()) {
           QMessageBox::warning(this, "提示", "请先在列表中选择要插入的组件");
           return;
       }

       // 2. 计算插入点（中点）
       QLineF lf = selectedConn->line();
       QPointF insertPos = (lf.p1() + lf.p2()) / 2;

       // 3. 删除原连线
       Item* from = selectedConn->from_;
       Item* to = selectedConn->to_;
       Item::AnchorType fromType = selectedConn->fromType_;
       Item::AnchorType toType = selectedConn->toType_;

       from->removeConnection(selectedConn);
       to->removeConnection(selectedConn);
       plcScenes[currentPageIndex()]->removeItem(selectedConn);
       delete selectedConn;

       // 4. 插入新元件
       Item* newItem = creatItem(selectedComponentType);
       newItem->setPos(insertPos);
       connect(newItem, &Item::requestCopy, plcViews[currentPageIndex()], &MyGraphicsView::onItemRequestCopy);
       connect(newItem, &Item::requestDelete, plcViews[currentPageIndex()], &MyGraphicsView::onItemRequestDelete);
       connect(newItem, &Item::requestBindRegister, plcViews[currentPageIndex()], &MyGraphicsView::onItemRequestBindRegister);
       connect(newItem, &Item::requestCompare, plcViews[currentPageIndex()], &MyGraphicsView::onItemRequestCompare);
       connect(newItem, &Item::requestReset, plcViews[currentPageIndex()], &MyGraphicsView::onItemRequestReset);
       connect(newItem, &Item::requestSetON,plcViews[currentPageIndex()], &MyGraphicsView::onItemRequestSetON);
       plcScenes[currentPageIndex()]->addItem(newItem);

       // 5. 新建两条连线
       Connection* c1 = new Connection(from, fromType, newItem, Item::Left);
       plcScenes[currentPageIndex()]->addItem(c1);
       Connection* c2 = new Connection(newItem, Item::Right, to, toType);
       plcScenes[currentPageIndex()]->addItem(c2);
}