#include "logic_editor_widget.h"

#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QGraphicsTextItem>
#include <QPainter>
#include <QPainterPath>
#include <QResizeEvent>
#include <QStyleOptionGraphicsItem>

#include <algorithm>
#include <type_traits>

namespace {

constexpr qreal kSceneMargin = 28.0;
constexpr qreal kRailInset = 40.0;
constexpr qreal kMinimumSceneWidth = 980.0;
constexpr qreal kCellWidth = 128.0;
constexpr qreal kCellHeight = 120.0;
constexpr qreal kNodeTerminalX = 50.0;
constexpr qreal kRungHeaderHeight = 52.0;
constexpr qreal kRungGap = 18.0;
constexpr qreal kLadderLineWidth = 1.8;
constexpr int kMinimumLogicColumns = 7;
const QColor kLadderColor(QStringLiteral("#263842"));
const QColor kActiveColor(QStringLiteral("#16854f"));
const QColor kFaultColor(QStringLiteral("#c5362e"));
const QColor kSelectionColor(QStringLiteral("#dfeef5"));
const QColor kSelectionBorderColor(QStringLiteral("#277da1"));
const QColor kGridColor(QStringLiteral("#e8edf0"));
const QColor kPlaceholderColor(QStringLiteral("#81919b"));

struct ExpressionMetrics
{
    int columns = 1;
    int rows = 1;
};

struct RenderResult
{
    QPointF input;
    QPointF output;
};

QString registerAddressText(const RegisterAddress &address)
{
    return QString::fromStdString(address.toString());
}

QString timerAddressText(const TimerAddress &address)
{
    return QString::fromStdString(address.toString());
}

QString counterAddressText(const CounterAddress &address)
{
    return QString::fromStdString(address.toString());
}

QString wordOperandText(const WordOperand &operand)
{
    return operand.kind == WordOperandKind::Register
        ? registerAddressText(operand.address)
        : QString::number(operand.constant);
}

void drawRegisterComment(
    QPainter *painter, const QString &comment, qreal top = 22.0)
{
    if (comment.isEmpty())
    {
        return;
    }
    QFont font = painter->font();
    font.setPointSizeF(8.0);
    painter->setFont(font);
    const QString visible_comment = painter->fontMetrics().elidedText(
        comment, Qt::ElideRight, static_cast<int>(kCellWidth - 8.0));
    painter->drawText(
        QRectF(-kCellWidth / 2.0, top, kCellWidth, 18),
        Qt::AlignCenter,
        visible_comment);
}

QString comparisonText(ComparisonOperator comparison)
{
    switch (comparison)
    {
    case ComparisonOperator::Equal: return QStringLiteral("=");
    case ComparisonOperator::NotEqual: return QStringLiteral("<>");
    case ComparisonOperator::LessThan: return QStringLiteral("<");
    case ComparisonOperator::LessThanOrEqual: return QStringLiteral("<=");
    case ComparisonOperator::GreaterThan: return QStringLiteral(">");
    case ComparisonOperator::GreaterThanOrEqual: return QStringLiteral(">=");
    }
    return QStringLiteral("?");
}

QString nodeToolTip(const LogicNodeConfig &config)
{
    return std::visit(
        [](const auto &value) -> QString
        {
            using Config = std::decay_t<decltype(value)>;
            if constexpr (std::is_same_v<Config, ContactNodeConfig>)
            {
                return LogicEditorWidget::tr("%1触点：%2")
                    .arg(value.mode == ContactMode::NormallyOpen
                             ? LogicEditorWidget::tr("常开")
                             : LogicEditorWidget::tr("常闭"))
                    .arg(registerAddressText(value.address));
            }
            else if constexpr (std::is_same_v<Config, EdgeContactNodeConfig>)
            {
                return LogicEditorWidget::tr("%1沿触点：%2")
                    .arg(value.mode == EdgeMode::Rising
                             ? LogicEditorWidget::tr("上升")
                             : LogicEditorWidget::tr("下降"))
                    .arg(registerAddressText(value.address));
            }
            else if constexpr (std::is_same_v<Config, TimerContactNodeConfig>)
            {
                return LogicEditorWidget::tr("T 触点：%1")
                    .arg(timerAddressText(value.address));
            }
            else if constexpr (std::is_same_v<Config, CounterContactNodeConfig>)
            {
                return LogicEditorWidget::tr("C 触点：%1")
                    .arg(counterAddressText(value.address));
            }
            else if constexpr (std::is_same_v<Config, CoilNodeConfig>)
            {
                return LogicEditorWidget::tr("输出线圈：%1")
                    .arg(registerAddressText(value.address));
            }
            else if constexpr (std::is_same_v<Config, CompareNodeConfig>)
            {
                return LogicEditorWidget::tr("比较条件：%1 %2 %3")
                    .arg(registerAddressText(value.address))
                    .arg(comparisonText(value.comparison))
                    .arg(value.value);
            }
            else if constexpr (std::is_same_v<Config, TonNodeConfig>)
            {
                return LogicEditorWidget::tr("TON：%1，预设 %2 ms")
                    .arg(timerAddressText(value.address))
                    .arg(value.presetMs);
            }
            else if constexpr (std::is_same_v<Config, CounterNodeConfig>)
            {
                return LogicEditorWidget::tr("%1：%2，CV %3，PV %4，复位 %5")
                    .arg(value.mode == CounterMode::Up
                             ? QStringLiteral("CTU") : QStringLiteral("CTD"))
                    .arg(counterAddressText(value.address))
                    .arg(registerAddressText(value.currentValueAddress))
                    .arg(wordOperandText(value.preset))
                    .arg(registerAddressText(value.resetAddress));
            }
            else if constexpr (std::is_same_v<Config, MoveNodeConfig>)
            {
                return LogicEditorWidget::tr("MOVE：%1 -> %2")
                    .arg(wordOperandText(value.source))
                    .arg(registerAddressText(value.destination));
            }
            else
            {
                return LogicEditorWidget::tr("%1：%2，%3 -> %4")
                    .arg(value.operation == ArithmeticOperation::Add
                             ? QStringLiteral("ADD") : QStringLiteral("SUB"))
                    .arg(wordOperandText(value.left))
                    .arg(wordOperandText(value.right))
                    .arg(registerAddressText(value.destination));
            }
        },
        config);
}

ExpressionMetrics measureExpression(const ConditionExpression &expression)
{
    if (expression.kind == ConditionExpressionKind::Node)
    {
        return {};
    }
    if (expression.kind == ConditionExpressionKind::Wire)
    {
        return {expression.wire->columnSpan, 1};
    }

    ExpressionMetrics metrics{0, 0};
    if (expression.kind == ConditionExpressionKind::Series)
    {
        for (const ConditionExpression &child : expression.children)
        {
            const ExpressionMetrics child_metrics = measureExpression(child);
            metrics.columns += child_metrics.columns;
            metrics.rows = std::max(metrics.rows, child_metrics.rows);
        }
    }
    else
    {
        for (const ConditionExpression &child : expression.children)
        {
            const ExpressionMetrics child_metrics = measureExpression(child);
            metrics.columns = std::max(metrics.columns, child_metrics.columns);
            metrics.rows += child_metrics.rows;
        }
    }
    return metrics;
}

QPen ladderPen(bool active)
{
    return QPen(active ? kActiveColor : kLadderColor,
                active ? 2.6 : kLadderLineWidth);
}

bool traceValue(
    const LogicTraceSnapshot &trace,
    const std::unordered_map<std::string, bool> LogicTraceSnapshot::*member,
    const std::string &id)
{
    const auto &values = trace.*member;
    const auto found = values.find(id);
    return found != values.end() && found->second;
}

void addGrid(
    QGraphicsScene &scene,
    qreal left,
    qreal top,
    int columns,
    int rows)
{
    QPen pen(kGridColor, 1.0);
    pen.setCosmetic(true);
    for (int column = 0; column <= columns; ++column)
    {
        const qreal x = left + static_cast<qreal>(column) * kCellWidth;
        QGraphicsLineItem *line = scene.addLine(
            QLineF(x, top, x, top + static_cast<qreal>(rows) * kCellHeight), pen);
        line->setZValue(-10.0);
    }
    for (int row = 0; row <= rows; ++row)
    {
        const qreal y = top + static_cast<qreal>(row) * kCellHeight;
        QGraphicsLineItem *line = scene.addLine(
            QLineF(left, y, left + static_cast<qreal>(columns) * kCellWidth, y), pen);
        line->setZValue(-10.0);
    }
}

void addPlaceholder(QGraphicsScene &scene, const QRectF &cell, const QString &text)
{
    const QRectF bounds = cell.adjusted(12, 18, -12, -18);
    QGraphicsRectItem *item = scene.addRect(
        bounds,
        QPen(kPlaceholderColor, 1.2, Qt::DashLine),
        QBrush(QColor(255, 255, 255, 220)));
    item->setZValue(1.0);
    QGraphicsTextItem *label = scene.addText(text);
    label->setDefaultTextColor(kPlaceholderColor);
    label->setPos(
        bounds.center().x() - label->boundingRect().width() / 2.0,
        bounds.center().y() - label->boundingRect().height() / 2.0);
    label->setZValue(2.0);
}

} // namespace

class LogicEditorWidget::NodeItem final : public QGraphicsItem
{
public:
    NodeItem(
        const LogicNode &node,
        const std::string &rung_id,
        const QPointF &center,
        const QString &register_comment,
        bool active,
        bool faulted,
        bool condition)
        : node_id_(node.id),
          rung_id_(rung_id),
          config_(node.config),
          register_comment_(register_comment),
          configured_(node.configured),
          active_(active),
          faulted_(faulted),
          condition_(condition)
    {
        setPos(center);
        setFlag(ItemIsSelectable, true);
        setZValue(3.0);
        QString tool_tip = configured_
            ? nodeToolTip(config_)
            : LogicEditorWidget::tr("待配置：请在属性区设置地址和参数");
        if (!register_comment_.isEmpty())
        {
            tool_tip += LogicEditorWidget::tr("\n注释：%1").arg(register_comment_);
        }
        setToolTip(tool_tip);
    }

    QRectF boundingRect() const override
    {
        return {-kCellWidth / 2.0, -kCellHeight / 2.0, kCellWidth, kCellHeight};
    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *) override
    {
        painter->setRenderHint(QPainter::Antialiasing, true);
        const bool selected = (option->state & QStyle::State_Selected) != 0;
        if (selected)
        {
            painter->fillRect(boundingRect().adjusted(2, 2, -2, -2), kSelectionColor);
            painter->setPen(QPen(kSelectionBorderColor, 1.4, Qt::DashLine));
            painter->drawRect(boundingRect().adjusted(3, 3, -3, -3));
        }

        const QColor symbol_color = faulted_ ? kFaultColor
            : selected ? kSelectionBorderColor : active_ ? kActiveColor : kLadderColor;
        painter->setPen(QPen(symbol_color, active_ || faulted_ ? 2.6 : kLadderLineWidth));
        QFont font = painter->font();
        font.setPointSizeF(9.5);
        painter->setFont(font);

        if (const auto *contact = std::get_if<ContactNodeConfig>(&config_))
        {
            painter->fillRect(QRectF(-25, -22, 50, 44), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-18, 0));
            painter->drawLine(QPointF(18, 0), QPointF(kNodeTerminalX, 0));
            painter->drawLine(QPointF(-18, -15), QPointF(-18, 15));
            painter->drawLine(QPointF(18, -15), QPointF(18, 15));
            if (contact->mode == ContactMode::NormallyClosed)
            {
                painter->drawLine(QPointF(-23, 18), QPointF(23, -18));
            }
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? registerAddressText(contact->address) : tr("< M 地址 >"));
            drawRegisterComment(painter, register_comment_);
        }
        else if (const auto *edge = std::get_if<EdgeContactNodeConfig>(&config_))
        {
            painter->fillRect(QRectF(-25, -22, 50, 44), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-18, 0));
            painter->drawLine(QPointF(18, 0), QPointF(kNodeTerminalX, 0));
            painter->drawLine(QPointF(-18, -15), QPointF(-18, 15));
            painter->drawLine(QPointF(18, -15), QPointF(18, 15));
            painter->drawText(
                QRectF(-14, -12, 28, 24),
                Qt::AlignCenter,
                edge->mode == EdgeMode::Rising ? QStringLiteral("P") : QStringLiteral("N"));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? registerAddressText(edge->address) : tr("< M 地址 >"));
            drawRegisterComment(painter, register_comment_);
        }
        else if (const auto *timer_contact =
                     std::get_if<TimerContactNodeConfig>(&config_))
        {
            painter->fillRect(QRectF(-25, -22, 50, 44), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-18, 0));
            painter->drawLine(QPointF(18, 0), QPointF(kNodeTerminalX, 0));
            painter->drawLine(QPointF(-18, -15), QPointF(-18, 15));
            painter->drawLine(QPointF(18, -15), QPointF(18, 15));
            if (timer_contact->mode == ContactMode::NormallyClosed)
            {
                painter->drawLine(QPointF(-23, 18), QPointF(23, -18));
            }
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? timerAddressText(timer_contact->address) : tr("< T 地址 >"));
        }
        else if (const auto *counter_contact =
                     std::get_if<CounterContactNodeConfig>(&config_))
        {
            painter->fillRect(QRectF(-25, -22, 50, 44), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-18, 0));
            painter->drawLine(QPointF(18, 0), QPointF(kNodeTerminalX, 0));
            painter->drawLine(QPointF(-18, -15), QPointF(-18, 15));
            painter->drawLine(QPointF(18, -15), QPointF(18, 15));
            if (counter_contact->mode == ContactMode::NormallyClosed)
            {
                painter->drawLine(QPointF(-23, 18), QPointF(23, -18));
            }
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? counterAddressText(counter_contact->address)
                            : tr("< C 地址 >"));
        }
        else if (const auto *coil = std::get_if<CoilNodeConfig>(&config_))
        {
            painter->fillRect(QRectF(-35, -23, 70, 46), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-16, 0));
            painter->drawLine(QPointF(16, 0), QPointF(kNodeTerminalX, 0));
            QPainterPath left;
            left.moveTo(-2, -20);
            left.cubicTo(-24, -16, -24, 16, -2, 20);
            painter->drawPath(left);
            QPainterPath right;
            right.moveTo(2, -20);
            right.cubicTo(24, -16, 24, 16, 2, 20);
            painter->drawPath(right);
            if (coil->mode != CoilMode::Normal)
            {
                painter->drawText(
                    QRectF(-12, -14, 24, 28),
                    Qt::AlignCenter,
                    coil->mode == CoilMode::Set ? QStringLiteral("S") : QStringLiteral("R"));
            }
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? registerAddressText(coil->address) : tr("< M 地址 >"));
            drawRegisterComment(painter, register_comment_);
        }
        else if (const auto *comparison = std::get_if<CompareNodeConfig>(&config_))
        {
            const QRectF box(-47, -17, 94, 34);
            painter->fillRect(box.adjusted(-1, -1, 1, 1), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-47, 0));
            painter->drawLine(QPointF(47, 0), QPointF(kNodeTerminalX, 0));
            painter->drawRect(box);
            painter->drawText(
                box, Qt::AlignCenter,
                QStringLiteral("%1 INT").arg(comparisonText(comparison->comparison)));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? registerAddressText(comparison->address) : tr("< D 地址 >"));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, 22, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? QString::number(comparison->value) : tr("< 常量 >"));
            drawRegisterComment(painter, register_comment_, 40.0);
        }
        else if (const auto *ton = std::get_if<TonNodeConfig>(&config_))
        {
            const QRectF box(-47, -18, 94, 36);
            painter->fillRect(box.adjusted(-1, -1, 1, 1), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-47, 0));
            painter->drawLine(QPointF(47, 0), QPointF(kNodeTerminalX, 0));
            painter->drawRect(box);
            painter->drawText(box, Qt::AlignCenter, QStringLiteral("TON"));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? timerAddressText(ton->address) : tr("< T 地址 >"));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, 22, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? QStringLiteral("PT %1 ms").arg(ton->presetMs)
                            : tr("< 预设时间 >"));
        }
        else if (const auto *counter = std::get_if<CounterNodeConfig>(&config_))
        {
            const QRectF box(-47, -18, 94, 36);
            painter->fillRect(box.adjusted(-1, -1, 1, 1), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-47, 0));
            painter->drawLine(QPointF(47, 0), QPointF(kNodeTerminalX, 0));
            painter->drawRect(box);
            painter->drawText(
                box,
                Qt::AlignCenter,
                counter->mode == CounterMode::Up
                    ? QStringLiteral("CTU") : QStringLiteral("CTD"));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? counterAddressText(counter->address)
                            : tr("< C 地址 >"));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, 22, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? QStringLiteral("CV %1 / PV %2")
                                  .arg(registerAddressText(counter->currentValueAddress))
                                  .arg(wordOperandText(counter->preset))
                            : tr("< CV / PV >"));
        }
        else if (const auto *move = std::get_if<MoveNodeConfig>(&config_))
        {
            const QRectF box(-47, -18, 94, 36);
            painter->fillRect(box.adjusted(-1, -1, 1, 1), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-47, 0));
            painter->drawLine(QPointF(47, 0), QPointF(kNodeTerminalX, 0));
            painter->drawRect(box);
            painter->drawText(box, Qt::AlignCenter, QStringLiteral("MOVE"));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? QStringLiteral("%1 -> %2")
                                  .arg(wordOperandText(move->source))
                                  .arg(registerAddressText(move->destination))
                            : tr("< 源 -> 目标 >"));
        }
        else if (const auto *arithmetic =
                     std::get_if<ArithmeticNodeConfig>(&config_))
        {
            const QRectF box(-47, -18, 94, 36);
            painter->fillRect(box.adjusted(-1, -1, 1, 1), Qt::white);
            painter->drawLine(QPointF(-kNodeTerminalX, 0), QPointF(-47, 0));
            painter->drawLine(QPointF(47, 0), QPointF(kNodeTerminalX, 0));
            painter->drawRect(box);
            painter->drawText(
                box,
                Qt::AlignCenter,
                arithmetic->operation == ArithmeticOperation::Add
                    ? QStringLiteral("ADD") : QStringLiteral("SUB"));
            painter->drawText(
                QRectF(-kCellWidth / 2.0, -40, kCellWidth, 18),
                Qt::AlignCenter,
                configured_ ? QStringLiteral("%1,%2 -> %3")
                                  .arg(wordOperandText(arithmetic->left))
                                  .arg(wordOperandText(arithmetic->right))
                                  .arg(registerAddressText(arithmetic->destination))
                            : tr("< 操作数 -> 目标 >"));
        }
    }

    const std::string &nodeId() const { return node_id_; }
    const std::string &rungId() const { return rung_id_; }
    bool isConditionNode() const { return condition_; }

private:
    std::string node_id_;
    std::string rung_id_;
    LogicNodeConfig config_;
    QString register_comment_;
    bool configured_ = true;
    bool active_ = false;
    bool faulted_ = false;
    bool condition_ = true;
};

class LogicEditorWidget::WireItem final : public QGraphicsItem
{
public:
    WireItem(
        const std::string &expression_id,
        const std::string &rung_id,
        const QPointF &center,
        int column_span,
        bool active)
        : expression_id_(expression_id),
          rung_id_(rung_id),
          width_(static_cast<qreal>(column_span) * kCellWidth),
          active_(active)
    {
        setPos(center);
        setFlag(ItemIsSelectable, true);
        setZValue(2.0);
        setToolTip(LogicEditorWidget::tr("横线：%1 列，可用触点直接替换")
                       .arg(column_span));
    }

    QRectF boundingRect() const override
    {
        return {-width_ / 2.0, -kCellHeight / 2.0, width_, kCellHeight};
    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *) override
    {
        const bool selected = (option->state & QStyle::State_Selected) != 0;
        if (selected)
        {
            painter->fillRect(boundingRect().adjusted(2, 2, -2, -2), kSelectionColor);
            painter->setPen(QPen(kSelectionBorderColor, 1.4, Qt::DashLine));
            painter->drawRect(boundingRect().adjusted(3, 3, -3, -3));
        }
        painter->setPen(ladderPen(active_));
        painter->drawLine(QPointF(-width_ / 2.0, 0), QPointF(width_ / 2.0, 0));
    }

    const std::string &expressionId() const { return expression_id_; }
    const std::string &rungId() const { return rung_id_; }

private:
    std::string expression_id_;
    std::string rung_id_;
    qreal width_ = kCellWidth;
    bool active_ = false;
};

class LogicEditorWidget::VerticalConnectorItem final : public QGraphicsItem
{
public:
    VerticalConnectorItem(
        const std::string &branch_expression_id,
        const std::string &rung_id,
        qreal x,
        qreal top,
        qreal bottom,
        bool active)
        : branch_expression_id_(branch_expression_id),
          rung_id_(rung_id),
          height_(bottom - top),
          active_(active)
    {
        setPos(x, top);
        setFlag(ItemIsSelectable, true);
        setZValue(2.5);
        setToolTip(LogicEditorWidget::tr("竖线连接：删除将移除对应并联支路"));
    }

    QRectF boundingRect() const override
    {
        return {-8.0, 0.0, 16.0, height_};
    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *) override
    {
        const bool selected = (option->state & QStyle::State_Selected) != 0;
        painter->setPen(QPen(
            selected ? kSelectionBorderColor
                     : active_ ? kActiveColor : kLadderColor,
            selected || active_ ? 3.0 : kLadderLineWidth));
        painter->drawLine(QPointF(0, 0), QPointF(0, height_));
        if (selected)
        {
            painter->setPen(QPen(kSelectionBorderColor, 1.0, Qt::DashLine));
            painter->drawRect(boundingRect().adjusted(1, 1, -1, -1));
        }
    }

    const std::string &branchExpressionId() const
    {
        return branch_expression_id_;
    }
    const std::string &rungId() const { return rung_id_; }

private:
    std::string branch_expression_id_;
    std::string rung_id_;
    qreal height_ = 0.0;
    bool active_ = false;
};

class LogicEditorWidget::RungItem final : public QGraphicsItem
{
public:
    RungItem(
        const LadderRung &rung,
        int number,
        qreal top,
        qreal height,
        qreal width,
        qreal cursor_left)
        : rung_id_(rung.id),
          name_(QString::fromStdString(rung.name)),
          comment_(QString::fromStdString(rung.comment)),
          number_(number),
          height_(height),
          width_(width),
          cursor_left_(cursor_left),
          show_cursor_(!rung.condition.has_value())
    {
        setPos(0, top);
        setFlag(ItemIsSelectable, true);
        setZValue(-2.0);
        if (!comment_.isEmpty())
        {
            setToolTip(comment_);
        }
    }

    QRectF boundingRect() const override { return {kSceneMargin, 0, width_, height_}; }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *) override
    {
        const bool selected = (option->state & QStyle::State_Selected) != 0;
        if (selected)
        {
            painter->fillRect(boundingRect(), QColor(240, 247, 250, 90));
            if (show_cursor_)
            {
                painter->setPen(QPen(kSelectionBorderColor, 1.4, Qt::DashLine));
                painter->drawRect(QRectF(
                    cursor_left_ + 3,
                    kRungHeaderHeight + 3,
                    kCellWidth - 6,
                    kCellHeight - 6));
            }
        }
        painter->setPen(QColor(QStringLiteral("#62717b")));
        QString title = tr("网络 %1").arg(number_);
        if (!name_.isEmpty() && !name_.startsWith(tr("网络 ")))
        {
            title += QStringLiteral("：") + name_;
        }
        painter->drawText(
            QRectF(kSceneMargin + 8, 5, 320, 22),
            Qt::AlignLeft | Qt::AlignVCenter,
            title);
        if (!comment_.isEmpty())
        {
            painter->setPen(QColor(QStringLiteral("#7b8790")));
            const QString visible_comment = painter->fontMetrics().elidedText(
                comment_, Qt::ElideRight, static_cast<int>(width_ - 16.0));
            painter->drawText(
                QRectF(kSceneMargin + 8, 24, width_ - 16, 22),
                Qt::AlignLeft | Qt::AlignVCenter,
                visible_comment);
        }
        painter->setPen(QPen(QColor(QStringLiteral("#d4dce1")), 1));
        painter->drawLine(
            QPointF(kSceneMargin + 8, height_ - 1),
            QPointF(kSceneMargin + width_ - 8, height_ - 1));
    }

    const std::string &rungId() const { return rung_id_; }

private:
    std::string rung_id_;
    QString name_;
    QString comment_;
    int number_ = 0;
    qreal height_ = 0.0;
    qreal width_ = 0.0;
    qreal cursor_left_ = 0.0;
    bool show_cursor_ = false;
};

namespace {

RenderResult renderExpression(
    QGraphicsScene &scene,
    const LogicEditorService &editor_service,
    const ConditionExpression &expression,
    const std::string &rung_id,
    const QPointF &top_left,
    const ExpressionMetrics &metrics,
    const LogicTraceSnapshot &trace,
    bool trace_enabled,
    const std::string &fault_node_id)
{
    if (expression.kind == ConditionExpressionKind::Wire)
    {
        const bool active = trace_enabled && traceValue(
            trace, &LogicTraceSnapshot::expressionPowerValues, expression.id);
        const qreal width = static_cast<qreal>(expression.wire->columnSpan) * kCellWidth;
        const QPointF center(
            top_left.x() + width / 2.0,
            top_left.y() + kCellHeight / 2.0);
        scene.addItem(new LogicEditorWidget::WireItem(
            expression.id,
            rung_id,
            center,
            expression.wire->columnSpan,
            active));
        return {
            QPointF(top_left.x(), center.y()),
            QPointF(top_left.x() + width, center.y())};
    }
    if (expression.kind == ConditionExpressionKind::Node)
    {
        const QPointF center(
            top_left.x() + kCellWidth / 2.0,
            top_left.y() + kCellHeight / 2.0);
        const bool node_active = trace_enabled && traceValue(
            trace, &LogicTraceSnapshot::nodePowerValues, expression.node->id);
        scene.addLine(
            QLineF(
                QPointF(top_left.x(), center.y()),
                QPointF(top_left.x() + kCellWidth, center.y())),
            ladderPen(node_active));
        scene.addItem(new LogicEditorWidget::NodeItem(
            *expression.node,
            rung_id,
            center,
            [&editor_service, &expression]
            {
                const std::optional<RegisterAddress> address =
                    registerAddressForLogicNode(expression.node->config);
                return address.has_value()
                    ? QString::fromStdString(
                          editor_service.registerCommentFor(*address))
                    : QString{};
            }(),
            node_active,
            expression.node->id == fault_node_id,
            true));
        return {
            QPointF(top_left.x(), center.y()),
            QPointF(top_left.x() + kCellWidth, center.y())};
    }

    if (expression.kind == ConditionExpressionKind::Series)
    {
        qreal x = top_left.x();
        RenderResult first;
        RenderResult previous;
        for (std::size_t index = 0; index < expression.children.size(); ++index)
        {
            const ExpressionMetrics child_metrics = measureExpression(expression.children[index]);
            const RenderResult current = renderExpression(
                scene,
                editor_service,
                expression.children[index],
                rung_id,
                QPointF(x, top_left.y()),
                child_metrics,
                trace,
                trace_enabled,
                fault_node_id);
            if (index == 0U)
            {
                first = current;
            }
            else
            {
                const bool previous_active = trace_enabled && traceValue(
                    trace,
                    &LogicTraceSnapshot::expressionPowerValues,
                    expression.children[index - 1U].id);
                scene.addLine(
                    QLineF(previous.output, current.input),
                    ladderPen(previous_active));
            }
            previous = current;
            x += static_cast<qreal>(child_metrics.columns) * kCellWidth;
        }
        return {first.input, previous.output};
    }

    qreal y = top_left.y();
    std::vector<RenderResult> branches;
    branches.reserve(expression.children.size());
    for (const ConditionExpression &child : expression.children)
    {
        const ExpressionMetrics child_metrics = measureExpression(child);
        branches.push_back(renderExpression(
            scene,
            editor_service,
            child,
            rung_id,
            QPointF(top_left.x(), y),
            child_metrics,
            trace,
            trace_enabled,
            fault_node_id));
        y += static_cast<qreal>(child_metrics.rows) * kCellHeight;
    }

    const qreal left_join = top_left.x();
    const qreal right_join = top_left.x() + static_cast<qreal>(metrics.columns) * kCellWidth;
    const qreal top_y = branches.front().input.y();
    const bool parallel_input_active = trace_enabled && traceValue(
        trace, &LogicTraceSnapshot::expressionInputValues, expression.id);
    for (std::size_t index = 1; index < branches.size(); ++index)
    {
        const qreal segment_top = branches[index - 1U].input.y();
        const qreal segment_bottom = branches[index].input.y();
        const bool branch_active = trace_enabled && traceValue(
            trace,
            &LogicTraceSnapshot::expressionPowerValues,
            expression.children[index].id);
        scene.addItem(new LogicEditorWidget::VerticalConnectorItem(
            expression.children[index].id,
            rung_id,
            left_join,
            segment_top,
            segment_bottom,
            parallel_input_active));
        scene.addItem(new LogicEditorWidget::VerticalConnectorItem(
            expression.children[index].id,
            rung_id,
            right_join,
            segment_top,
            segment_bottom,
            branch_active));
    }
    for (std::size_t index = 0; index < branches.size(); ++index)
    {
        const bool branch_active = trace_enabled && traceValue(
            trace,
            &LogicTraceSnapshot::expressionPowerValues,
            expression.children[index].id);
        scene.addLine(
            QLineF(QPointF(left_join, branches[index].input.y()), branches[index].input),
            ladderPen(branch_active));
        scene.addLine(
            QLineF(branches[index].output, QPointF(right_join, branches[index].output.y())),
            ladderPen(branch_active));
    }
    return {QPointF(left_join, top_y), QPointF(right_join, top_y)};
}

} // namespace

LogicEditorWidget::LogicEditorWidget(LogicEditorService &editor_service, QWidget *parent)
    : QGraphicsView(parent), editor_service_(editor_service)
{
    scene_ = new QGraphicsScene(this);
    setScene(scene_);
    setRenderHint(QPainter::Antialiasing, true);
    setBackgroundBrush(Qt::white);
    setDragMode(QGraphicsView::RubberBandDrag);
    setAlignment(Qt::AlignLeft | Qt::AlignTop);
    connect(scene_, &QGraphicsScene::selectionChanged,
            this, &LogicEditorWidget::handleSelectionChanged);
}

void LogicEditorWidget::setLogicId(const std::string &logic_id)
{
    if (logic_id_ == logic_id)
    {
        return;
    }
    logic_id_ = logic_id;
    current_rung_id_.clear();
    reloadLogic();
}

void LogicEditorWidget::setEditingEnabled(bool enabled)
{
    editing_enabled_ = enabled;
    setInteractive(enabled);
}

void LogicEditorWidget::setRuntimeTrace(
    const LogicTraceSnapshot &trace, const std::string &fault_node_id)
{
    trace_ = trace;
    fault_node_id_ = fault_node_id;
    runtime_trace_enabled_ = true;
    reloadLogic();
}

void LogicEditorWidget::clearRuntimeTrace()
{
    trace_.clear();
    fault_node_id_.clear();
    runtime_trace_enabled_ = false;
    reloadLogic();
}

void LogicEditorWidget::reloadLogic()
{
    scene_->clear();
    const ControlLogic *logic = editor_service_.findLogic(logic_id_);
    if (logic == nullptr)
    {
        scene_->setSceneRect(0, 0, kMinimumSceneWidth, 400);
        return;
    }
    if (current_rung_id_.empty() && !logic->rungs.empty())
    {
        current_rung_id_ = logic->rungs.front().id;
    }

    int condition_columns = 1;
    for (const LadderRung &rung : logic->rungs)
    {
        if (rung.condition.has_value())
        {
            condition_columns = std::max(
                condition_columns,
                measureExpression(*rung.condition).columns);
        }
    }
    const int grid_columns = std::max(kMinimumLogicColumns, condition_columns + 1);
    const qreal left_rail_x = kSceneMargin + kRailInset;
    const qreal right_rail_x = left_rail_x + static_cast<qreal>(grid_columns) * kCellWidth;
    const qreal scene_width = std::max(kMinimumSceneWidth, right_rail_x + kSceneMargin);

    qreal top = kSceneMargin;
    int number = 1;
    for (const LadderRung &rung : logic->rungs)
    {
        const ExpressionMetrics metrics = rung.condition.has_value()
            ? measureExpression(*rung.condition) : ExpressionMetrics{};
        const int grid_rows = std::max(1, metrics.rows);
        const qreal grid_top = top + kRungHeaderHeight;
        const qreal rung_height = kRungHeaderHeight
            + static_cast<qreal>(grid_rows) * kCellHeight + 12.0;
        scene_->addItem(new RungItem(
            rung,
            number,
            top,
            rung_height,
            scene_width - 2.0 * kSceneMargin,
            left_rail_x));
        addGrid(*scene_, left_rail_x, grid_top, grid_columns, grid_rows);
        scene_->addLine(
            QLineF(left_rail_x, grid_top, left_rail_x,
                   grid_top + static_cast<qreal>(grid_rows) * kCellHeight),
            QPen(kLadderColor, 2.4));
        scene_->addLine(
            QLineF(right_rail_x, grid_top, right_rail_x,
                   grid_top + static_cast<qreal>(grid_rows) * kCellHeight),
            QPen(kLadderColor, 2.4));

        const qreal main_y = grid_top + kCellHeight / 2.0;
        QPointF expression_output(left_rail_x, main_y);
        if (rung.condition.has_value())
        {
            const RenderResult rendered = renderExpression(
                *scene_,
                editor_service_,
                *rung.condition,
                rung.id,
                QPointF(left_rail_x, grid_top),
                metrics,
                trace_,
                runtime_trace_enabled_,
                fault_node_id_);
            expression_output = rendered.output;
        }
        else
        {
            addPlaceholder(
                *scene_,
                QRectF(left_rail_x, grid_top, kCellWidth, kCellHeight),
                rung.output.has_value() ? tr("无条件") : tr("添加条件"));
        }

        const bool rung_active = runtime_trace_enabled_ && traceValue(
            trace_, &LogicTraceSnapshot::rungValues, rung.id);
        const qreal output_left = right_rail_x - kCellWidth;
        scene_->addLine(
            QLineF(expression_output, QPointF(output_left, main_y)),
            ladderPen(rung_active));
        if (rung.output.has_value())
        {
            scene_->addLine(
                QLineF(QPointF(output_left, main_y), QPointF(right_rail_x, main_y)),
                ladderPen(rung_active));
            scene_->addItem(new NodeItem(
                *rung.output,
                rung.id,
                QPointF(output_left + kCellWidth / 2.0, main_y),
                [&rung, this]
                {
                    const std::optional<RegisterAddress> address =
                        registerAddressForLogicNode(rung.output->config);
                    return address.has_value()
                        ? QString::fromStdString(
                              editor_service_.registerCommentFor(*address))
                        : QString{};
                }(),
                [&rung, this, rung_active]
                {
                    return (std::holds_alternative<TonNodeConfig>(rung.output->config)
                            || std::holds_alternative<CounterNodeConfig>(
                                rung.output->config))
                        ? traceValue(
                              trace_,
                              &LogicTraceSnapshot::nodeValues,
                              rung.output->id)
                        : rung_active;
                }(),
                rung.output->id == fault_node_id_,
                false));
        }
        else
        {
            addPlaceholder(
                *scene_,
                QRectF(output_left, grid_top, kCellWidth, kCellHeight),
                tr("输出线圈"));
            scene_->addLine(
                QLineF(
                    QPointF(output_left + kCellWidth, main_y),
                    QPointF(right_rail_x, main_y)),
                ladderPen(rung_active));
        }
        top += rung_height + kRungGap;
        ++number;
    }
    scene_->setSceneRect(0, 0, scene_width, std::max(400.0, top + kSceneMargin));
}

void LogicEditorWidget::selectNode(const std::string &node_id)
{
    for (QGraphicsItem *item : scene_->items())
    {
        if (NodeItem *node = dynamic_cast<NodeItem *>(item))
        {
            node->setSelected(node->nodeId() == node_id);
            if (node->nodeId() == node_id)
            {
                current_rung_id_ = node->rungId();
                ensureVisible(node);
            }
        }
        else
        {
            item->setSelected(false);
        }
    }
}

void LogicEditorWidget::selectExpression(const std::string &expression_id)
{
    for (QGraphicsItem *item : scene_->items())
    {
        bool selected = false;
        if (NodeItem *node = dynamic_cast<NodeItem *>(item))
        {
            selected = node->isConditionNode() && node->nodeId() == expression_id;
            if (selected)
            {
                current_rung_id_ = node->rungId();
                ensureVisible(node);
            }
        }
        else if (WireItem *wire = dynamic_cast<WireItem *>(item))
        {
            selected = wire->expressionId() == expression_id;
            if (selected)
            {
                current_rung_id_ = wire->rungId();
                ensureVisible(wire);
            }
        }
        item->setSelected(selected);
    }
}

void LogicEditorWidget::selectWire(const std::string &wire_id)
{
    selectExpression(wire_id);
}

std::string LogicEditorWidget::selectedNodeId() const
{
    const std::vector<std::string> ids = selectedNodeIds();
    return ids.size() == 1U ? ids.front() : std::string{};
}

std::vector<std::string> LogicEditorWidget::selectedNodeIds() const
{
    std::vector<std::pair<QPointF, std::string>> positioned_ids;
    for (QGraphicsItem *item : scene_->selectedItems())
    {
        if (const NodeItem *node = dynamic_cast<const NodeItem *>(item))
        {
            positioned_ids.emplace_back(node->scenePos(), node->nodeId());
        }
    }
    std::sort(
        positioned_ids.begin(), positioned_ids.end(),
        [](const auto &left, const auto &right)
        {
            if (!qFuzzyCompare(left.first.y(), right.first.y()))
            {
                return left.first.y() < right.first.y();
            }
            return left.first.x() < right.first.x();
        });
    std::vector<std::string> ids;
    ids.reserve(positioned_ids.size());
    for (const auto &positioned_id : positioned_ids)
    {
        ids.push_back(positioned_id.second);
    }
    return ids;
}

std::vector<std::string> LogicEditorWidget::selectedExpressionIds() const
{
    std::vector<std::pair<QPointF, std::string>> positioned_ids;
    for (QGraphicsItem *item : scene_->selectedItems())
    {
        if (const NodeItem *node = dynamic_cast<const NodeItem *>(item))
        {
            if (node->isConditionNode())
            {
                positioned_ids.emplace_back(node->scenePos(), node->nodeId());
            }
        }
        else if (const WireItem *wire = dynamic_cast<const WireItem *>(item))
        {
            positioned_ids.emplace_back(wire->scenePos(), wire->expressionId());
        }
    }
    std::sort(
        positioned_ids.begin(), positioned_ids.end(),
        [](const auto &left, const auto &right)
        {
            if (!qFuzzyCompare(left.first.y(), right.first.y()))
            {
                return left.first.y() < right.first.y();
            }
            return left.first.x() < right.first.x();
        });
    std::vector<std::string> ids;
    ids.reserve(positioned_ids.size());
    for (const auto &positioned_id : positioned_ids)
    {
        ids.push_back(positioned_id.second);
    }
    return ids;
}

std::vector<std::string> LogicEditorWidget::selectedWireIds() const
{
    std::vector<std::string> ids;
    for (QGraphicsItem *item : scene_->selectedItems())
    {
        if (const WireItem *wire = dynamic_cast<const WireItem *>(item))
        {
            ids.push_back(wire->expressionId());
        }
    }
    return ids;
}

std::vector<std::string> LogicEditorWidget::selectedBranchIds() const
{
    std::vector<std::string> ids;
    for (QGraphicsItem *item : scene_->selectedItems())
    {
        if (const VerticalConnectorItem *connector =
                dynamic_cast<const VerticalConnectorItem *>(item))
        {
            if (std::find(ids.cbegin(), ids.cend(), connector->branchExpressionId())
                == ids.cend())
            {
                ids.push_back(connector->branchExpressionId());
            }
        }
    }
    return ids;
}

std::string LogicEditorWidget::selectedRungId() const
{
    std::string rung_id;
    for (QGraphicsItem *item : scene_->selectedItems())
    {
        if (const NodeItem *node = dynamic_cast<const NodeItem *>(item))
        {
            if (!rung_id.empty() && rung_id != node->rungId())
            {
                return {};
            }
            rung_id = node->rungId();
        }
        else if (const WireItem *wire = dynamic_cast<const WireItem *>(item))
        {
            if (!rung_id.empty() && rung_id != wire->rungId())
            {
                return {};
            }
            rung_id = wire->rungId();
        }
        else if (const VerticalConnectorItem *connector =
                     dynamic_cast<const VerticalConnectorItem *>(item))
        {
            if (!rung_id.empty() && rung_id != connector->rungId())
            {
                return {};
            }
            rung_id = connector->rungId();
        }
        else if (const RungItem *rung = dynamic_cast<const RungItem *>(item))
        {
            if (rung_id.empty())
            {
                rung_id = rung->rungId();
            }
        }
    }
    return rung_id;
}

LogicEditorResult LogicEditorWidget::addRung()
{
    const LogicEditorResult result = editor_service_.addRung(logic_id_);
    if (result.succeeded)
    {
        current_rung_id_ = result.id;
        reloadLogic();
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

LogicEditorResult LogicEditorWidget::addCondition(const LogicNodeConfig &config)
{
    const std::vector<std::string> selected_expressions = selectedExpressionIds();
    const std::vector<std::string> selected_wires = selectedWireIds();
    const std::vector<std::string> selected_ids = selectedNodeIds();
    LogicEditorResult result;
    if (selected_expressions.size() > 1U || selected_wires.size() > 1U)
    {
        result = {false, LogicEditorError::InvalidOperation,
                  "串联插入或替换横线时只能选择一个条件对象", {}};
    }
    else if (selected_wires.size() == 1U)
    {
        result = editor_service_.replaceWireWithCondition(
            logic_id_, currentRungId(), selected_wires.front(), config);
    }
    else if (selected_ids.size() == 1U)
    {
        const LogicNode *selected_node = editor_service_.findNode(
            logic_id_, selected_ids.front());
        result = selected_node != nullptr && selected_node->isCondition()
            ? editor_service_.insertConditionAfter(
                  logic_id_, currentRungId(), selected_ids.front(), config)
            : editor_service_.appendCondition(logic_id_, currentRungId(), config);
    }
    else
    {
        result = editor_service_.appendCondition(logic_id_, currentRungId(), config);
    }
    if (result.succeeded)
    {
        reloadLogic();
        selectExpression(result.id);
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

LogicEditorResult LogicEditorWidget::addParallelBranch(const LogicNodeConfig &config)
{
    const std::string rung_id = selectedRungId();
    const std::vector<std::string> selected_ids = selectedNodeIds();
    std::vector<std::string> condition_ids;
    for (const std::string &node_id : selected_ids)
    {
        const LogicNode *node = editor_service_.findNode(logic_id_, node_id);
        if (node != nullptr && node->isCondition())
        {
            condition_ids.push_back(node_id);
        }
    }
    LogicEditorResult result;
    if (rung_id.empty() || condition_ids.empty())
    {
        result = {false, LogicEditorError::InvalidOperation,
                  "请在同一网络中选择要并联的连续节点", {}};
    }
    else
    {
        result = editor_service_.addParallelBranch(
            logic_id_, rung_id, condition_ids, config);
    }
    if (result.succeeded)
    {
        reloadLogic();
        selectExpression(result.id);
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

LogicEditorResult LogicEditorWidget::addHorizontalWire()
{
    const std::vector<std::string> selected_ids = selectedExpressionIds();
    LogicEditorResult result;
    if (selected_ids.size() > 1U)
    {
        result = {false, LogicEditorError::InvalidOperation,
                  "插入横线时只能选择一个条件对象", {}};
    }
    else if (selected_ids.size() == 1U)
    {
        result = editor_service_.insertWireAfter(
            logic_id_, currentRungId(), selected_ids.front());
    }
    else
    {
        result = editor_service_.appendWire(logic_id_, currentRungId());
    }
    if (result.succeeded)
    {
        reloadLogic();
        selectWire(result.id);
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

LogicEditorResult LogicEditorWidget::addVerticalWire()
{
    const std::string rung_id = selectedRungId();
    const std::vector<std::string> selected_ids = selectedExpressionIds();
    LogicEditorResult result;
    if (rung_id.empty() || selected_ids.empty())
    {
        result = {false, LogicEditorError::InvalidOperation,
                  "请在同一网络中选择要连接的连续条件或横线", {}};
    }
    else
    {
        result = editor_service_.addParallelWireBranch(
            logic_id_, rung_id, selected_ids);
    }
    if (result.succeeded)
    {
        reloadLogic();
        selectWire(result.id);
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

LogicEditorResult LogicEditorWidget::deleteHorizontalWire()
{
    const std::vector<std::string> wire_ids = selectedWireIds();
    const std::string rung_id = selectedRungId();
    if (wire_ids.empty() || rung_id.empty())
    {
        const LogicEditorResult result = {
            false,
            LogicEditorError::InvalidOperation,
            "请先选择要删除的横线",
            {}};
        reportFailure(result);
        return result;
    }
    const LogicEditorResult result = editor_service_.removeExpressions(
        logic_id_, rung_id, wire_ids);
    if (result.succeeded)
    {
        reloadLogic();
        emit nodeSelected({});
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

LogicEditorResult LogicEditorWidget::deleteVerticalWire()
{
    const std::vector<std::string> branch_ids = selectedBranchIds();
    if (branch_ids.empty())
    {
        const LogicEditorResult result = {
            false,
            LogicEditorError::InvalidOperation,
            "请先选择要删除的竖线连接",
            {}};
        reportFailure(result);
        return result;
    }
    const std::string rung_id = selectedRungId();
    LogicEditorResult result;
    if (rung_id.empty())
    {
        result = {false, LogicEditorError::InvalidOperation,
                  "竖线连接必须位于同一网络", {}};
    }
    else
    {
        result = editor_service_.removeExpressions(
            logic_id_, rung_id, branch_ids);
    }
    if (result.succeeded)
    {
        reloadLogic();
        emit nodeSelected({});
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

LogicEditorResult LogicEditorWidget::setOutput(
    const LogicNodeConfig &config, bool configured)
{
    const LogicEditorResult result = editor_service_.setOutput(
        logic_id_, currentRungId(), config, configured);
    if (result.succeeded)
    {
        reloadLogic();
        selectNode(result.id);
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

LogicEditorResult LogicEditorWidget::deleteSelected()
{
    const std::vector<std::string> expression_ids = selectedExpressionIds();
    const std::vector<std::string> wire_ids = selectedWireIds();
    const std::vector<std::string> branch_ids = selectedBranchIds();
    const std::vector<std::string> node_ids = selectedNodeIds();
    LogicEditorResult result;
    if (!branch_ids.empty())
    {
        result = editor_service_.removeExpressions(
            logic_id_, selectedRungId(), branch_ids);
    }
    else if (!wire_ids.empty())
    {
        bool output_selected = false;
        for (QGraphicsItem *item : scene_->selectedItems())
        {
            if (const NodeItem *node = dynamic_cast<const NodeItem *>(item))
            {
                output_selected = output_selected || !node->isConditionNode();
            }
        }
        if (output_selected)
        {
            result = {false, LogicEditorError::InvalidOperation,
                      "不能同时删除横线和输出节点", {}};
        }
        else
        {
            result = editor_service_.removeExpressions(
                logic_id_, selectedRungId(), expression_ids);
        }
    }
    else if (!node_ids.empty())
    {
        result = editor_service_.removeNodes(logic_id_, node_ids);
    }
    else
    {
        const std::string rung_id = selectedRungId();
        if (rung_id.empty())
        {
            return {false, LogicEditorError::InvalidOperation,
                    "请先选择要删除的逻辑节点或网络", {}};
        }
        result = editor_service_.removeRung(logic_id_, rung_id);
        if (result.succeeded && current_rung_id_ == rung_id)
        {
            current_rung_id_ = editor_service_.firstRungId(logic_id_);
        }
    }
    if (result.succeeded)
    {
        reloadLogic();
        emit nodeSelected({});
        emit graphChanged();
    }
    else
    {
        reportFailure(result);
    }
    return result;
}

void LogicEditorWidget::resizeEvent(QResizeEvent *event)
{
    QGraphicsView::resizeEvent(event);
}

void LogicEditorWidget::handleSelectionChanged()
{
    const std::string rung_id = selectedRungId();
    if (!rung_id.empty())
    {
        current_rung_id_ = rung_id;
    }
    emit nodeSelected(QString::fromStdString(selectedNodeId()));
}

void LogicEditorWidget::reportFailure(const LogicEditorResult &result)
{
    emit editorError(QString::fromStdString(result.message));
}

std::string LogicEditorWidget::currentRungId() const
{
    const std::string selected = selectedRungId();
    if (!selected.empty())
    {
        return selected;
    }
    return current_rung_id_.empty()
        ? editor_service_.firstRungId(logic_id_) : current_rung_id_;
}