#include "hmi_editor_widget.h"

#include "services/hmi_editor_service.h"
#include "services/hmi_runtime_service.h"
#include "services/alarm_service.h"
#include "domain/project_limits.h"

#include <QApplication>
#include <QDateTime>
#include <QFont>
#include <QGraphicsItem>
#include <QGraphicsRectItem>
#include <QGraphicsScene>
#include <QGraphicsSceneHoverEvent>
#include <QGraphicsSceneMouseEvent>
#include <QInputDialog>
#include <QPainter>
#include <QResizeEvent>
#include <QStyle>
#include <QStyleOption>
#include <QStyleOptionGraphicsItem>

#include <algorithm>
#include <cmath>
#include <cstdint>
#include <functional>
#include <limits>

namespace {

constexpr qreal kAlarmHeaderHeight = 24.0;
constexpr qreal kAlarmRowHeight = 22.0;
constexpr qreal kAlarmCellLeftPadding = 5.0;
constexpr qreal kAlarmCellRightPadding = 5.0;
constexpr qreal kAlarmColumnSpacing = 3.0;
constexpr qreal kAlarmTimeColumnWidth = 76.0;
constexpr qreal kAlarmStateColumnWidth = 52.0;
constexpr qreal kAlarmPageButtonSize = 16.0;
constexpr qreal kAlarmPageIndicatorWidth = 34.0;

QString alarmTimeText(const std::chrono::system_clock::time_point &time)
{
    const auto seconds = std::chrono::duration_cast<std::chrono::seconds>(
        time.time_since_epoch()).count();
    return QDateTime::fromSecsSinceEpoch(seconds).toString(QStringLiteral("HH:mm:ss"));
}

// 将领域层 HMI 控件投影为可绘制、可选择和可交互的场景图元
class HmiGraphicsItem final : public QGraphicsItem
{
public:
    // 保存控件快照、页面边界和回调，使图元不直接依赖服务层
    HmiGraphicsItem(
        const HmiControl &control,
        int page_width,
        int page_height,
        std::function<void(const std::string &, const QPointF &)> moved,
        std::function<void(const std::string &, HmiButtonEvent)> button_event,
        std::function<void(const std::string &)> numeric_input_activated,
        std::function<void(const std::string &)> page_navigation,
        std::function<void(const std::string &)> alarm_acknowledge)
        : control_(control),
          page_width_(page_width),
          page_height_(page_height),
          moved_(std::move(moved)),
          button_event_(std::move(button_event)),
          numeric_input_activated_(std::move(numeric_input_activated)),
          page_navigation_(std::move(page_navigation)),
          alarm_acknowledge_(std::move(alarm_acknowledge))
    {
        // 领域坐标直接作为图元在场景中的初始位置
        setPos(control_.bounds.x, control_.bounds.y);
        // 所有控件均可选中，便于主窗口显示对应属性
        setFlag(ItemIsSelectable, true);
        // 开启可选中
        setFlag(ItemSendsGeometryChanges, true);
        // 画布只处理左键交互，保留其他按键给视图默认行为
        setAcceptedMouseButtons(Qt::LeftButton);
    }

    // 返回图元自身坐标系中的矩形范围，用于绘制和命中测试
    QRectF boundingRect() const override
    {
        if (!control_.binding.has_value())
        {
            return visibleControlRect();
        }
        return visibleControlRect().united(addressRect());
    }

    void paint(
        QPainter *painter,
        const QStyleOptionGraphicsItem *option,
        QWidget *) override
    {
        // 留出一个像素边距，避免描边被图元边界裁剪
        const QRectF rect = visibleControlRect().adjusted(1, 1, -1, -1);
        painter->setRenderHint(QPainter::Antialiasing, true);
        painter->setPen(QPen(QColor(QStringLiteral("#47545f")), 1));

        if (control_.binding.has_value())
        {
            const QFont original_font = painter->font();
            QFont address_font = original_font;
            address_font.setPixelSize(11);
            painter->setFont(address_font);
            painter->setPen(QColor(QStringLiteral("#5f6b73")));
            painter->drawText(addressRect(), Qt::AlignCenter, bindingText());
            painter->setFont(original_font);
            painter->setPen(QPen(QColor(QStringLiteral("#47545f")), 1));
        }

        applyConfiguredFont(painter);

        switch (control_.type)
        {
        case HmiControlType::Button:
        {
            const bool disabled = !editing_enabled_ && runtime_active_
                && !runtime_write_enabled_;
            const QColor fill = disabled
                ? QColor(QStringLiteral("#e2e6e4"))
                : button_pressed_ ? QColor(QStringLiteral("#a9cbb6"))
                : button_hovered_ ? QColor(QStringLiteral("#cce4d5"))
                                  : QColor(QStringLiteral("#dcece3"));
            const QColor border = disabled
                ? QColor(QStringLiteral("#a5ada9"))
                : button_pressed_ ? QColor(QStringLiteral("#356248"))
                                  : QColor(QStringLiteral("#5e816b"));
            const QColor text = disabled
                ? QColor(QStringLiteral("#7a837e"))
                : configuredTextColor(QColor(QStringLiteral("#205c3b")));

            // 未按下时保留下沿阴影，按下后将按钮面下移形成明确的回弹感
            QRectF face = rect.adjusted(0, 0, 0, -2);
            if (!disabled && button_pressed_)
            {
                face.translate(0, 2);
            }
            else
            {
                painter->setPen(Qt::NoPen);
                painter->setBrush(disabled
                                      ? QColor(QStringLiteral("#c5cbc8"))
                                      : QColor(QStringLiteral("#789b85")));
                painter->drawRoundedRect(face.translated(0, 2), 4, 4);
            }
            painter->setPen(QPen(border, button_pressed_ ? 2 : 1));
            painter->setBrush(fill);
            painter->drawRoundedRect(face, 4, 4);
            painter->setPen(text);
            painter->drawText(face, Qt::AlignCenter, textWithValue());
            break;
        }
        case HmiControlType::Indicator:
        {
            // 指示灯颜色由最近一次读取到的 M 位值决定
            const qreal diameter = std::min(rect.width(), rect.height() - 18.0);
            const QRectF lamp(
                rect.center().x() - diameter / 2.0,
                rect.top() + 2,
                diameter,
                diameter);
            painter->setBrush(bit_value_ ? QColor(QStringLiteral("#24a148"))
                                         : QColor(QStringLiteral("#b8c1c8")));
            painter->drawEllipse(lamp);
            painter->setPen(configuredTextColor(QColor(QStringLiteral("#24313b"))));
            painter->drawText(
                QRectF(rect.left(), lamp.bottom() + 1, rect.width(), 16),
                Qt::AlignCenter,
                QString::fromUtf8(control_.text.data(),
                                  static_cast<int>(control_.text.size())));
            break;
        }
        case HmiControlType::NumericDisplay:
        {
            // 数值显示为只读样式，文本由运行值刷新
            painter->setBrush(QColor(QStringLiteral("#edf2f6")));
            painter->drawRect(rect);
            painter->setPen(configuredTextColor(QColor(QStringLiteral("#24313b"))));
            painter->drawText(rect.adjusted(7, 0, -7, 0),
                              Qt::AlignVCenter | Qt::AlignLeft,
                              textWithValue());
            break;
        }
        case HmiControlType::NumericInput:
        {
            // 数值输入以白色编辑框样式呈现，双击后才请求写入
            painter->setBrush(QColor(QStringLiteral("#ffffff")));
            painter->drawRoundedRect(rect, 3, 3);
            painter->setPen(configuredTextColor(QColor(QStringLiteral("#24313b"))));
            painter->drawText(rect.adjusted(7, 0, -7, 0),
                              Qt::AlignVCenter | Qt::AlignLeft,
                              textWithValue());
            break;
        }
        case HmiControlType::ProgressBar:
        {
            const HmiProgressBarConfig config = control_.progressBar.value_or(
                HmiProgressBarConfig{});
            const int percentage = has_runtime_value_
                ? config.percentageForValue(word_value_) : 0;

            painter->setPen(Qt::NoPen);
            painter->setBrush(QColor(QStringLiteral("#e4e9e7")));
            painter->drawRoundedRect(rect, 4, 4);

            const QRectF track = rect.adjusted(2, 2, -2, -2);
            if (has_runtime_value_ && percentage > 0)
            {
                QRectF fill = track;
                fill.setWidth(track.width() * percentage / 100.0);
                painter->setBrush(QColor(QStringLiteral("#3c8c62")));
                painter->drawRoundedRect(fill, 3, 3);
            }

            painter->setBrush(Qt::NoBrush);
            painter->setPen(QPen(QColor(QStringLiteral("#617069")), 1));
            painter->drawRoundedRect(rect, 4, 4);

            QString display_text = QString::fromUtf8(
                control_.text.data(), static_cast<int>(control_.text.size()));
            if (config.showValue)
            {
                const QString percentage_text = has_runtime_value_
                    ? QString::number(percentage) + QLatin1Char('%')
                    : runtime_active_ ? QStringLiteral("--")
                                      : QStringLiteral("0%");
                display_text = display_text.isEmpty()
                    ? percentage_text
                    : display_text + QStringLiteral(": ") + percentage_text;
            }
            painter->setPen(configuredTextColor(QColor(QStringLiteral("#20342a"))));
            painter->drawText(rect.adjusted(6, 0, -6, 0),
                              Qt::AlignCenter,
                              display_text);
            break;
        }
        case HmiControlType::PageJump:
        {
            const QColor fill = runtime_active_ && page_hovered_
                ? QColor(QStringLiteral("#d8eafa"))
                : QColor(QStringLiteral("#e8f1fa"));
            painter->setBrush(fill);
            painter->setPen(QPen(QColor(QStringLiteral("#4e789f")), 1));
            painter->drawRoundedRect(rect, 4, 4);
            painter->setPen(configuredTextColor(QColor(QStringLiteral("#244b6b"))));
            painter->drawText(rect, Qt::AlignCenter, textWithValue());
            break;
        }
        case HmiControlType::AlarmList:
        {
            painter->setPen(QPen(QColor(QStringLiteral("#9b3a3a")), 1));
            painter->setBrush(QColor(QStringLiteral("#ffffff")));
            painter->drawRect(rect);
            const QRectF header(
                rect.left(), rect.top(), rect.width(), kAlarmHeaderHeight);
            painter->fillRect(header, QColor(QStringLiteral("#a63f3f")));
            painter->setPen(Qt::white);
            QRectF title_rect = header.adjusted(7, 0, -7, 0);
            const std::size_t page_count = alarmPageCount();
            if (runtime_active_ && page_count > 1U)
            {
                const QRectF previous_rect = alarmPreviousPageRect(header);
                const QRectF next_rect = alarmNextPageRect(header);
                const QRectF indicator_rect = alarmPageIndicatorRect(header);
                title_rect.setRight(previous_rect.left() - kAlarmColumnSpacing);

                QStyleOption previous_option;
                previous_option.rect = previous_rect.toAlignedRect();
                previous_option.state = alarm_page_ > 0U
                    ? QStyle::State_Enabled : QStyle::State_None;
                QApplication::style()->drawPrimitive(
                    QStyle::PE_IndicatorArrowLeft,
                    &previous_option,
                    painter);

                QStyleOption next_option;
                next_option.rect = next_rect.toAlignedRect();
                next_option.state = alarm_page_ + 1U < page_count
                    ? QStyle::State_Enabled : QStyle::State_None;
                QApplication::style()->drawPrimitive(
                    QStyle::PE_IndicatorArrowRight,
                    &next_option,
                    painter);
                painter->setPen(Qt::white);
                painter->drawText(
                    indicator_rect,
                    Qt::AlignCenter,
                    QStringLiteral("%1/%2")
                        .arg(static_cast<qulonglong>(alarm_page_ + 1U))
                        .arg(static_cast<qulonglong>(page_count)));
            }
            const QString title = QString::fromUtf8(
                control_.text.data(), static_cast<int>(control_.text.size()));
            painter->drawText(
                title_rect,
                Qt::AlignVCenter | Qt::AlignLeft,
                painter->fontMetrics().elidedText(
                    title,
                    Qt::ElideRight,
                    std::max(0, static_cast<int>(title_rect.width()))));

            const int visible_rows = static_cast<int>(visibleAlarmRecordCount());
            if (visible_rows == 0)
            {
                painter->setPen(configuredTextColor(QColor(QStringLiteral("#6f7a82"))));
                painter->drawText(
                    QRectF(
                        rect.left(),
                        header.bottom(),
                        rect.width(),
                        rect.height() - kAlarmHeaderHeight),
                    Qt::AlignCenter,
                    runtime_active_ ? QObject::tr("暂无报警")
                                    : QObject::tr("运行时显示当前报警"));
                break;
            }
            const std::size_t first_record = alarmFirstRecordIndex();
            for (int row = 0; row < visible_rows; ++row)
            {
                const AlarmRecord &record = alarm_records_[
                    first_record + static_cast<std::size_t>(row)];
                const QRectF row_rect(
                    rect.left(),
                    header.bottom() + row * kAlarmRowHeight,
                    rect.width(),
                    kAlarmRowHeight);
                painter->fillRect(
                    row_rect,
                    QColor(QStringLiteral("#fde8e8")));
                painter->setPen(QColor(QStringLiteral("#d3d8dc")));
                painter->drawLine(row_rect.bottomLeft(), row_rect.bottomRight());
                painter->setPen(configuredTextColor(QColor(QStringLiteral("#8d1f1f"))));
                const QString state = record.acknowledged
                    ? QObject::tr("已确认") : QObject::tr("未确认");
                const QRectF time_rect(
                    row_rect.left() + kAlarmCellLeftPadding,
                    row_rect.top(),
                    kAlarmTimeColumnWidth,
                    row_rect.height());
                const QRectF state_rect(
                    time_rect.right() + kAlarmColumnSpacing,
                    row_rect.top(),
                    kAlarmStateColumnWidth,
                    row_rect.height());
                const qreal message_left =
                    state_rect.right() + kAlarmColumnSpacing;
                const QRectF message_rect(
                    message_left,
                    row_rect.top(),
                    std::max(
                        0.0,
                        row_rect.right() - kAlarmCellRightPadding
                            - message_left),
                    row_rect.height());
                painter->drawText(
                    time_rect,
                    Qt::AlignVCenter | Qt::AlignLeft,
                    alarmTimeText(record.occurredAt));
                painter->drawText(
                    state_rect,
                    Qt::AlignVCenter | Qt::AlignLeft,
                    state);
                painter->drawText(
                    message_rect,
                    Qt::AlignVCenter | Qt::AlignLeft,
                    painter->fontMetrics().elidedText(
                        QString::fromUtf8(
                            record.message.data(),
                            static_cast<int>(record.message.size())),
                        Qt::ElideRight,
                        std::max(0, static_cast<int>(message_rect.width()))));
            }
            break;
        }
        case HmiControlType::Label:
        default:
        {
            // 标签只显示固定文本，不绑定寄存器运行值
            painter->setPen(configuredTextColor(QColor(QStringLiteral("#24313b"))));
            painter->drawText(rect, Qt::AlignCenter,
                              QString::fromUtf8(control_.text.data(),
                                                static_cast<int>(control_.text.size())));
            break;
        }
        }

        if ((option->state & QStyle::State_Selected) != 0)
        {
            // 选中框独立于控件类型，提示当前可编辑对象
            painter->setBrush(Qt::NoBrush);
            painter->setPen(QPen(QColor(QStringLiteral("#1677a8")), 2));
            painter->drawRect(controlRect().adjusted(0, 0, -1, -1));
        }
    }

    // 向场景和外部控件返回该图元对应的领域控件标识
    const std::string &controlId() const
    {
        return control_.id;
    }

    // 分离编辑选择与运行输入，避免运行态点击继续显示编辑选中框
    void setInteractionState(
        bool editable, bool runtime_active, bool runtime_write_enabled)
    {
        if (control_.type == HmiControlType::AlarmList)
        {
            prepareGeometryChange();
            if (!runtime_active)
            {
                alarm_page_ = 0U;
            }
        }
        editing_enabled_ = editable;
        runtime_active_ = runtime_active;
        runtime_write_enabled_ = runtime_active && runtime_write_enabled;
        setFlag(ItemIsMovable, editable);
        setFlag(ItemIsSelectable, editable);
        if (!editable)
        {
            setSelected(false);
        }

        const bool runtime_input = runtime_active_
            && (control_.type == HmiControlType::Button
                || control_.type == HmiControlType::NumericInput
                || control_.type == HmiControlType::PageJump
                || control_.type == HmiControlType::AlarmList);
        const bool runtime_input_enabled = runtime_input
            && (control_.type == HmiControlType::PageJump
                || control_.type == HmiControlType::AlarmList
                || runtime_write_enabled_);
        setAcceptedMouseButtons(
            editable || runtime_input_enabled ? Qt::LeftButton : Qt::NoButton);

        const bool runtime_button_enabled = runtime_active_
            && control_.type == HmiControlType::Button && runtime_write_enabled_;
        const bool runtime_page_jump_enabled = runtime_active_
            && control_.type == HmiControlType::PageJump;
        const bool runtime_alarm_enabled = runtime_active_
            && control_.type == HmiControlType::AlarmList;
        setAcceptHoverEvents(runtime_button_enabled || runtime_page_jump_enabled);
        if (runtime_button_enabled || runtime_page_jump_enabled
            || runtime_alarm_enabled)
        {
            setCursor(Qt::PointingHandCursor);
        }
        else
        {
            unsetCursor();
            button_hovered_ = false;
            page_hovered_ = false;
            button_pressed_ = false;
        }
        updateAlarmVisibility();
        update();
    }

    // 缓存运行服务读出的值并触发 Qt 重绘
    void setRuntimeValue(bool bit_value, std::int16_t word_value, bool available)
    {
        bit_value_ = bit_value;
        word_value_ = word_value;
        has_runtime_value_ = available;
        update();
    }

    void setAlarmRecords(const std::vector<AlarmRecord> &records)
    {
        if (control_.type == HmiControlType::AlarmList)
        {
            prepareGeometryChange();
        }
        alarm_records_ = records;
        const std::size_t page_count = alarmPageCount();
        alarm_page_ = page_count == 0U
            ? 0U : std::min(alarm_page_, page_count - 1U);
        updateAlarmVisibility();
        update();
    }

protected:
    // 拖拽过程中将新位置限制在页面可见边界内
    QVariant itemChange(GraphicsItemChange change, const QVariant &value) override
    {
        // 只有开启 ItemIsMovable 拖拽时，才做坐标钳位
        if (change == ItemPositionChange && flags().testFlag(ItemIsMovable))
        {
            // 在图元层预先截断拖拽坐标，避免控件视觉上越出页面
            QPointF position = value.toPointF();
            const qreal maximum_x = std::max(
                0.0, static_cast<double>(page_width_ - control_.bounds.width));
            const qreal maximum_y = std::max(
                0.0, static_cast<double>(page_height_ - control_.bounds.height));
            position.setX(std::clamp(position.x(), 0.0, maximum_x));
            position.setY(std::clamp(position.y(), 0.0, maximum_y));
            return position;
        }
        return QGraphicsItem::itemChange(change, value);
    }

    // 运行态按钮按下时通知外层执行配置的 M 位操作
    void mousePressEvent(QGraphicsSceneMouseEvent *event) override
    {
        if (runtime_active_ && control_.type == HmiControlType::AlarmList)
        {
            if (event->pos().y() < kAlarmHeaderHeight)
            {
                const QRectF content_rect =
                    visibleControlRect().adjusted(1, 1, -1, -1);
                const QRectF header(
                    content_rect.left(),
                    content_rect.top(),
                    content_rect.width(),
                    kAlarmHeaderHeight);
                const std::size_t page_count = alarmPageCount();
                if (alarmPreviousPageRect(header).contains(event->pos())
                    && alarm_page_ > 0U)
                {
                    prepareGeometryChange();
                    --alarm_page_;
                    update();
                }
                else if (alarmNextPageRect(header).contains(event->pos())
                         && alarm_page_ + 1U < page_count)
                {
                    prepareGeometryChange();
                    ++alarm_page_;
                    update();
                }
                event->accept();
                return;
            }
            const int row = static_cast<int>(
                (event->pos().y() - kAlarmHeaderHeight) / kAlarmRowHeight);
            const std::size_t record_index = alarmFirstRecordIndex()
                + static_cast<std::size_t>(std::max(0, row));
            if (row >= 0
                && row < static_cast<int>(visibleAlarmRecordCount())
                && record_index < alarm_records_.size())
            {
                const AlarmRecord &record = alarm_records_[record_index];
                if (!record.acknowledged && alarm_acknowledge_)
                {
                    alarm_acknowledge_(record.definitionId);
                }
            }
            event->accept();
            return;
        }
        if (runtime_active_ && control_.type == HmiControlType::PageJump)
        {
            page_pressed_ = true;
            update();
            event->accept();
            return;
        }
        if (runtime_active_ && runtime_write_enabled_
            && control_.type == HmiControlType::Button && button_event_)
        {
            button_pressed_ = true;
            update();
            button_event_(control_.id, HmiButtonEvent::Pressed);
            event->accept();
            return;
        }
        // 编辑模式：不进if分支，执行基类事件——只做选中、拖拽
        QGraphicsItem::mousePressEvent(event);
    }

    // 运行态双击数值输入时通知外层弹出数值编辑对话框
    void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event) override
    {
        if (runtime_active_ && runtime_write_enabled_
            && control_.type == HmiControlType::NumericInput
            && numeric_input_activated_)
        {
            // 数值输入使用双击，避免普通选择操作意外写入 D 字
            numeric_input_activated_(control_.id);
            event->accept();
            return;
        }
        QGraphicsItem::mouseDoubleClickEvent(event);
    }

    // 拖拽结束后才提交最终坐标，避免移动过程频繁修改领域模型
    void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override
    {
        if (runtime_active_ && control_.type == HmiControlType::PageJump
            && page_pressed_)
        {
            page_pressed_ = false;
            update();
            if (page_navigation_ && control_.pageJump.has_value())
            {
                page_navigation_(control_.pageJump->targetPageId);
            }
            event->accept();
            return;
        }
        if (runtime_active_ && runtime_write_enabled_
            && control_.type == HmiControlType::Button && button_pressed_)
        {
            button_pressed_ = false;
            update();
            button_event_(control_.id, HmiButtonEvent::Released);
            event->accept();
            return;
        }
        QGraphicsItem::mouseReleaseEvent(event);
        // 只有ItemIsMovable打开（编辑态），松开鼠标才提交位置给业务层
        if (flags().testFlag(ItemIsMovable) && moved_)
        {
            moved_(control_.id, pos());
        }
    }

    void hoverEnterEvent(QGraphicsSceneHoverEvent *event) override
    {
        if (runtime_active_ && runtime_write_enabled_
            && control_.type == HmiControlType::Button)
        {
            button_hovered_ = true;
            update();
        }
        if (runtime_active_ && control_.type == HmiControlType::PageJump)
        {
            page_hovered_ = true;
            update();
        }
        QGraphicsItem::hoverEnterEvent(event);
    }

    void hoverLeaveEvent(QGraphicsSceneHoverEvent *event) override
    {
        if (button_hovered_)
        {
            button_hovered_ = false;
            update();
        }
        if (page_hovered_)
        {
            page_hovered_ = false;
            update();
        }
        QGraphicsItem::hoverLeaveEvent(event);
    }

private:
    std::size_t alarmPageSize() const
    {
        const QRectF rect = controlRect().adjusted(1, 1, -1, -1);
        const int rows_by_height = std::max(
            0,
            static_cast<int>((rect.height() - kAlarmHeaderHeight)
                             / kAlarmRowHeight));
        return static_cast<std::size_t>(std::min(
            rows_by_height, ProjectLimits::kMaximumVisibleAlarmRows));
    }

    std::size_t alarmPageCount() const
    {
        const std::size_t page_size = alarmPageSize();
        return page_size == 0U || alarm_records_.empty()
            ? 0U
            : (alarm_records_.size() + page_size - 1U) / page_size;
    }

    std::size_t alarmFirstRecordIndex() const
    {
        return alarm_page_ * alarmPageSize();
    }

    std::size_t visibleAlarmRecordCount() const
    {
        const std::size_t first_record = alarmFirstRecordIndex();
        if (first_record >= alarm_records_.size())
        {
            return 0U;
        }
        return std::min(
            alarmPageSize(), alarm_records_.size() - first_record);
    }

    QRectF visibleControlRect() const
    {
        const QRectF full_rect = controlRect();
        if (control_.type != HmiControlType::AlarmList || !runtime_active_)
        {
            return full_rect;
        }
        const qreal content_height = kAlarmHeaderHeight
            + static_cast<qreal>(visibleAlarmRecordCount()) * kAlarmRowHeight
            + 2.0;
        return {full_rect.left(),
                full_rect.top(),
                full_rect.width(),
                std::min(full_rect.height(), content_height)};
    }

    QRectF alarmNextPageRect(const QRectF &header) const
    {
        return {
            header.right() - kAlarmCellRightPadding - kAlarmPageButtonSize,
            header.center().y() - kAlarmPageButtonSize / 2.0,
            kAlarmPageButtonSize,
            kAlarmPageButtonSize};
    }

    QRectF alarmPageIndicatorRect(const QRectF &header) const
    {
        const QRectF next_rect = alarmNextPageRect(header);
        return {
            next_rect.left() - kAlarmPageIndicatorWidth,
            header.top(),
            kAlarmPageIndicatorWidth,
            header.height()};
    }

    QRectF alarmPreviousPageRect(const QRectF &header) const
    {
        const QRectF indicator_rect = alarmPageIndicatorRect(header);
        return {
            indicator_rect.left() - kAlarmPageButtonSize,
            header.center().y() - kAlarmPageButtonSize / 2.0,
            kAlarmPageButtonSize,
            kAlarmPageButtonSize};
    }

    void updateAlarmVisibility()
    {
        if (control_.type != HmiControlType::AlarmList)
        {
            return;
        }
        const bool has_active_alarm = !alarm_records_.empty();
        setVisible(editing_enabled_ || !runtime_active_ || has_active_alarm);
        setZValue(runtime_active_ && has_active_alarm ? 1000.0 : 0.0);
    }

    // 控件本体范围保持领域坐标和尺寸语义不变
    QRectF controlRect() const
    {
        return {0,
                0,
                static_cast<qreal>(control_.bounds.width),
                static_cast<qreal>(control_.bounds.height)};
    }

    // 地址作为控件的附属信息显示在本体上方
    QRectF addressRect() const
    {
        constexpr qreal address_height = 16.0;
        constexpr qreal address_spacing = 2.0;
        return {0,
                -address_height - address_spacing,
                static_cast<qreal>(control_.bounds.width),
                address_height};
    }

    QString bindingText() const
    {
        return control_.binding.has_value()
            ? QString::fromStdString(control_.binding->toString())
            : QString{};
    }

    QColor configuredTextColor(const QColor &fallback) const
    {
        const auto property = control_.properties.find(
            HmiAppearanceProperty::kTextColor);
        if (property == control_.properties.cend())
        {
            return fallback;
        }
        const QColor color = QColor(QString::fromUtf8(
            property->second.data(), static_cast<int>(property->second.size())));
        return color.isValid() ? color : fallback;
    }

    void applyConfiguredFont(QPainter *painter) const
    {
        if (painter == nullptr)
        {
            return;
        }
        QFont font = painter->font();
        const auto font_size = control_.properties.find(
            HmiAppearanceProperty::kFontSize);
        if (font_size != control_.properties.cend())
        {
            bool ok = false;
            const int point_size = QString::fromUtf8(
                font_size->second.data(),
                static_cast<int>(font_size->second.size())).toInt(&ok);
            if (ok
                && point_size >= ProjectLimits::kMinimumHmiFontPointSize
                && point_size <= ProjectLimits::kMaximumHmiFontPointSize)
            {
                font.setPointSize(point_size);
            }
        }
        else if (control_.type == HmiControlType::AlarmList
                 && font.pointSize() > 0)
        {
            font.setPointSize(std::max(
                ProjectLimits::kMinimumHmiFontPointSize,
                font.pointSize()
                    - ProjectLimits::kAlarmDefaultFontPointReduction));
        }
        const auto font_bold = control_.properties.find(
            HmiAppearanceProperty::kFontBold);
        if (font_bold != control_.properties.cend())
        {
            font.setBold(font_bold->second == "true");
        }
        const auto font_italic = control_.properties.find(
            HmiAppearanceProperty::kFontItalic);
        if (font_italic != control_.properties.cend())
        {
            font.setItalic(font_italic->second == "true");
        }
        painter->setFont(font);
    }

    // 根据控件类型和运行数据组合当前应绘制的文字
    QString textWithValue() const
    {
        const QString text = QString::fromUtf8(
            control_.text.data(), static_cast<int>(control_.text.size()));
        if (!has_runtime_value_ || control_.type == HmiControlType::Button)
        {
            return text;
        }
        if (control_.type == HmiControlType::NumericDisplay
            || control_.type == HmiControlType::NumericInput)
        {
            return text + QStringLiteral(": ") + QString::number(word_value_);
        }
        return text;
    }

    // 图元创建时的领域控件快照，提供类型、尺寸、文本和标识
    HmiControl control_;
    // 当前页面宽度，用于限制图元横向拖拽范围
    int page_width_ = 0;
    // 当前页面高度，用于限制图元纵向拖拽范围
    int page_height_ = 0;
    // 拖拽完成后回调 HmiEditorWidget 提交控件新位置
    std::function<void(const std::string &, const QPointF &)> moved_;
    std::function<void(const std::string &, HmiButtonEvent)> button_event_;
    std::function<void(const std::string &)> numeric_input_activated_;
    std::function<void(const std::string &)> page_navigation_;
    std::function<void(const std::string &)> alarm_acknowledge_;
    std::vector<AlarmRecord> alarm_records_;
    std::size_t alarm_page_ = 0U;
    bool editing_enabled_ = true;
    bool runtime_active_ = false;
    bool runtime_write_enabled_ = false;
    bool button_hovered_ = false;
    bool button_pressed_ = false;
    bool page_hovered_ = false;
    bool page_pressed_ = false;
    // 指示灯读取到的 M 位值
    bool bit_value_ = false;
    // 数值控件读取到的 D 字值
    std::int16_t word_value_ = 0;
    // 标记当前缓存值是否来自一次成功的运行时读取
    bool has_runtime_value_ = false;
};

// 将场景通用图元安全转换为本文件定义的 HMI 控件图元
HmiGraphicsItem *asHmiItem(QGraphicsItem *item)
{
    return dynamic_cast<HmiGraphicsItem *>(item);
}

} // namespace

HmiEditorWidget::HmiEditorWidget(
    HmiEditorService &editor_service,
    HmiRuntimeService &runtime_service,
    AlarmService &alarm_service,
    QWidget *parent)
    : QGraphicsView(parent),
      editor_service_(editor_service),
      runtime_service_(runtime_service),
      alarm_service_(alarm_service),
      scene_(new QGraphicsScene(this))
{
    setObjectName(QStringLiteral("hmiEditorWidget"));
    setScene(scene_);
    setRenderHint(QPainter::Antialiasing, true);
    setDragMode(QGraphicsView::RubberBandDrag);
    setBackgroundBrush(QColor(QStringLiteral("#dfe5e9")));
    connect(scene_, &QGraphicsScene::selectionChanged,
            this, &HmiEditorWidget::handleSelectionChanged);
}

// 切换显示页面
void HmiEditorWidget::setPageId(const std::string &page_id)
{
    // 切换页面只改变投影上下文，真正的页面数据仍由 ProjectService 持有
    if (page_id_ == page_id)
    {
        return;
    }
    page_id_ = page_id;
    reloadPage();
}

void HmiEditorWidget::setEditingEnabled(bool enabled)
{
    editing_enabled_ = enabled;
    setDragMode(enabled ? QGraphicsView::RubberBandDrag : QGraphicsView::NoDrag);
    updateItemInteractions();
}

void HmiEditorWidget::setRuntimeActive(bool active)
{
    runtime_active_ = active;
    if (!runtime_active_)
    {
        runtime_write_enabled_ = false;
        for (QGraphicsItem *item : scene_->items())
        {
            HmiGraphicsItem *control_item = asHmiItem(item);
            if (control_item != nullptr)
            {
                control_item->setRuntimeValue(false, 0, false);
                control_item->setAlarmRecords({});
            }
        }
    }
    updateItemInteractions();
}

void HmiEditorWidget::setRuntimeWriteEnabled(bool enabled)
{
    runtime_write_enabled_ = runtime_active_ && enabled;
    updateItemInteractions();
}

// 全部重新加载当前页面，把内存模型 HmiPage 渲染成画面上图形
void HmiEditorWidget::reloadPage()
{
    // 模型发生变化后完全重建图元，避免增量刷新遗漏属性或选择状态
    // 画布始终从当前领域页面重建，避免保留已删除控件的图元
    scene_->clear();
    const HmiPage *page = editor_service_.findPage(page_id_);
    if (page == nullptr)
    {
        scene_->setSceneRect({});
        emit controlSelected({});
        return;
    }

    scene_->setSceneRect(0, 0, page->width, page->height);
    QGraphicsRectItem *page_border = scene_->addRect(
        scene_->sceneRect(), QPen(QColor(QStringLiteral("#8a98a3")), 1), Qt::white);
    page_border->setZValue(-1);
    page_border->setAcceptedMouseButtons(Qt::NoButton);

    for (const HmiControl &control : page->controls)
    {
        auto *item = new HmiGraphicsItem(
            control,
            page->width,
            page->height,
            [this](const std::string &control_id, const QPointF &position)
            {
                handleControlMoved(control_id, position);
            },
            [this](const std::string &control_id, HmiButtonEvent event)
            {
                handleButtonEvent(control_id, event);
            },
            [this](const std::string &control_id)
            {
                handleNumericInputActivated(control_id);
            },
            [this](const std::string &target_page_id)
            {
                emit pageNavigationRequested(
                    QString::fromStdString(target_page_id));
            },
            [this](const std::string &definition_id)
            {
                alarm_service_.acknowledge(definition_id);
                refreshRuntimeValues();
            });
        scene_->addItem(item);
        item->setInteractionState(
            editing_enabled_, runtime_active_, runtime_write_enabled_);
    }
    fitCurrentPage();
    refreshRuntimeValues();
}

// 遍历场景所有图元，找到对应 id 的图元，设置选中，视图滚动到把控件显示出来
void HmiEditorWidget::selectControl(const std::string &control_id)
{
    scene_->clearSelection();
    for (QGraphicsItem *item : scene_->items())
    {
        HmiGraphicsItem *control_item = asHmiItem(item);
        if (control_item != nullptr && control_item->controlId() == control_id)
        {
            control_item->setSelected(true);
            ensureVisible(control_item);
            return;
        }
    }
}

std::string HmiEditorWidget::selectedControlId() const
{
    const std::vector<std::string> ids = selectedControlIds();
    return ids.empty() ? std::string{} : ids.front();
}

std::vector<std::string> HmiEditorWidget::selectedControlIds() const
{
    std::vector<std::pair<QPointF, std::string>> positioned_ids;
    for (QGraphicsItem *item : scene_->selectedItems())
    {
        const HmiGraphicsItem *control_item = asHmiItem(item);
        if (control_item != nullptr)
        {
            positioned_ids.emplace_back(
                control_item->scenePos(), control_item->controlId());
        }
    }
    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;
}

void HmiEditorWidget::refreshRuntimeValues()
{
    // 运行态才读取寄存器；编辑态画布只显示工程配置，不显示缓存值
    if (!runtime_active_)
    {
        return;
    }
    for (QGraphicsItem *item : scene_->items())
    {
        HmiGraphicsItem *control_item = asHmiItem(item);
        if (control_item == nullptr)
        {
            continue;
        }
        const HmiControl *control = editor_service_.findControl(
            page_id_, control_item->controlId());
        if (control == nullptr)
        {
            continue;
        }
        if (control->type == HmiControlType::AlarmList)
        {
            control_item->setAlarmRecords(alarm_service_.records());
            continue;
        }
        // 运行值通过服务读取，图元不直接接触寄存器仓库
        const HmiRuntimeReadResult value = runtime_service_.readControl(*control);
        control_item->setRuntimeValue(value.bit_value, value.word_value, value.succeeded);
    }
}

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

void HmiEditorWidget::fitCurrentPage()
{
    if (scene_->sceneRect().isEmpty())
    {
        return;
    }
    fitInView(
        scene_->sceneRect().adjusted(-24, -24, 24, 24),
        Qt::KeepAspectRatio);
}

void HmiEditorWidget::updateItemInteractions()
{
    // 遍历所有控件图元，统一设置flag
    for (QGraphicsItem *item : scene_->items())
    {
        HmiGraphicsItem *control_item = asHmiItem(item);
        if (control_item != nullptr)
        {
            control_item->setInteractionState(
                editing_enabled_, runtime_active_, runtime_write_enabled_);
        }
    }
}

void HmiEditorWidget::handleSelectionChanged()
{
    emit controlSelected(QString::fromStdString(selectedControlId()));
}

void HmiEditorWidget::handleControlMoved(
    const std::string &control_id, const QPointF &position)
{
    // 拖动结束后把坐标交给服务层，由服务层负责页面边界校验和历史记录
    const HmiControl *control = editor_service_.findControl(page_id_, control_id);
    if (control == nullptr)
    {
        return;
    }
    // 鼠标坐标取整后再交给服务校验并写回模型
    HmiRect bounds = control->bounds;
    bounds.x = static_cast<int>(std::lround(position.x()));
    bounds.y = static_cast<int>(std::lround(position.y()));
    const HmiEditorResult result = editor_service_.moveControl(
        page_id_, control_id, bounds);
    if (!result.succeeded)
    {
        emit editorError(QString::fromStdString(result.message));
        reloadPage();
        return;
    }
    emit controlChanged(QString::fromStdString(control_id));
}

void HmiEditorWidget::handleButtonEvent(
    const std::string &control_id, HmiButtonEvent event)
{
    if (!runtime_active_ || !runtime_write_enabled_)
    {
        return;
    }
    // 运行态按钮事件只通过 HmiRuntimeService 写寄存器，不直接访问仓库
    const HmiControl *control = editor_service_.findControl(page_id_, control_id);
    if (control == nullptr)
    {
        return;
    }
    if (control->type != HmiControlType::Button)
    {
        return;
    }
    const HmiRuntimeWriteResult result = runtime_service_.operateButton(*control, event);
    if (!result.succeeded)
    {
        emit editorError(tr("寄存器操作失败"));
        return;
    }
    refreshRuntimeValues();
}

void HmiEditorWidget::handleNumericInputActivated(const std::string &control_id)
{
    if (!runtime_active_ || !runtime_write_enabled_)
    {
        return;
    }
    const HmiControl *control = editor_service_.findControl(page_id_, control_id);
    if (control == nullptr || control->type != HmiControlType::NumericInput)
    {
        return;
    }
    bool accepted = false;
    const HmiRuntimeReadResult current = runtime_service_.readControl(*control);
    const int initial = current.succeeded ? current.word_value : 0;
    const int value = QInputDialog::getInt(
        this,
        tr("输入数值"),
        QString::fromUtf8(control->text.data(), static_cast<int>(control->text.size())),
        initial,
        std::numeric_limits<std::int16_t>::min(),
        std::numeric_limits<std::int16_t>::max(),
        1,
        &accepted);
    if (!accepted)
    {
        return;
    }
    const HmiRuntimeWriteResult result = runtime_service_.writeNumericInput(
        *control, static_cast<std::int16_t>(value));
    if (!result.succeeded)
    {
        emit editorError(tr("寄存器操作失败"));
        return;
    }
    refreshRuntimeValues();
}