#include "GraphEditorWidget.h"
#include "PresetManager.h"
#include "WarpGraphModel.h"

#include <QtNodes/BasicGraphicsScene>
#include <QtNodes/ConnectionStyle>
#include <QtNodes/GraphicsView>
#include <QtNodes/internal/NodeGraphicsObject.hpp>
#include <QtNodes/internal/ConnectionGraphicsObject.hpp>
#include <QtNodes/internal/UndoCommands.hpp>

#include <QAction>
#include <QClipboard>
#include <QContextMenuEvent>
#include <QCoreApplication>
#include <QDateTime>
#include <QDir>
#include <QFileDialog>
#include <QGraphicsItem>
#include <QGuiApplication>
#include <QInputDialog>
#include <QMouseEvent>
#include <QJsonArray>
#include <QJsonDocument>
#include <QMenu>
#include <QListWidget>
#include <QMainWindow>
#include <QMessageBox>
#include <QMimeData>
#include <QPixmap>
#include <QPushButton>
#include <QSplitter>
#include <QStandardPaths>
#include <QStatusBar>
#include <QTabWidget>
#include <QTimer>
#include <QUndoCommand>
#include <QVBoxLayout>

#include <algorithm>
#include <unordered_map>
#include <unordered_set>

class DeleteVirtualNodeCommand : public QUndoCommand {
public:
  struct Snapshot {
    uint32_t pwNodeId;
    QtNodes::NodeId qtNodeId;
    std::string name;
    std::string mediaClass;
    QPointF position;
  };

  DeleteVirtualNodeCommand(GraphEditorWidget *widget,
                           const QList<QtNodes::NodeId> &nodeIds)
      : m_widget(widget) {
    WarpGraphModel *model = widget->m_model;
    for (auto nodeId : nodeIds) {
      const WarpNodeData *data = model->warpNodeData(nodeId);
      if (!data)
        continue;
      WarpNodeType type = WarpGraphModel::classifyNode(data->info);
      if (type != WarpNodeType::kVirtualSink &&
          type != WarpNodeType::kVirtualSource)
        continue;

      Snapshot snap;
      snap.pwNodeId = data->info.id.value;
      snap.qtNodeId = nodeId;
      snap.name = data->info.name;
      snap.mediaClass = data->info.media_class;
      snap.position =
          model->nodeData(nodeId, QtNodes::NodeRole::Position).toPointF();
      m_snapshots.push_back(snap);
    }
    setText(QStringLiteral("Delete Virtual Node"));
  }

  void undo() override {
    if (!m_widget)
      return;
    auto *client = m_widget->m_client;
    auto *model = m_widget->m_model;
    if (!client || !model)
      return;

    for (const auto &snap : m_snapshots) {
      model->setPendingPosition(snap.name, snap.position);
      bool isSink = snap.mediaClass == "Audio/Sink" ||
                    snap.mediaClass == "Audio/Duplex";
      if (isSink) {
        client->CreateVirtualSink(snap.name);
      } else {
        client->CreateVirtualSource(snap.name);
      }
    }
    model->refreshFromClient();
  }

  void redo() override {
    if (!m_widget)
      return;
    auto *client = m_widget->m_client;
    auto *model = m_widget->m_model;
    if (!client || !model)
      return;

    for (auto &snap : m_snapshots) {
      uint32_t currentPwId = model->findPwNodeIdByName(snap.name);
      if (currentPwId != 0) {
        snap.pwNodeId = currentPwId;
        client->RemoveNode(warppipe::NodeId{currentPwId});
      }
    }
    model->refreshFromClient();
  }

private:
  GraphEditorWidget *m_widget = nullptr;
  std::vector<Snapshot> m_snapshots;
};

GraphEditorWidget::GraphEditorWidget(warppipe::Client *client,
                                     QWidget *parent)
    : QWidget(parent), m_client(client) {
  m_layoutPath =
      QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation) +
      QStringLiteral("/layout.json");

  m_model = new WarpGraphModel(client, this);
  bool hasLayout = m_model->loadLayout(m_layoutPath);

  m_scene = new QtNodes::BasicGraphicsScene(*m_model, this);

  QtNodes::ConnectionStyle::setConnectionStyle(
      R"({"ConnectionStyle": {
        "ConstructionColor": "#b4b4c8",
        "NormalColor": "#c8c8dc",
        "SelectedColor": "#ffa500",
        "SelectedHaloColor": "#ffa50040",
        "HoveredColor": "#f0c878",
        "LineWidth": 2.4,
        "ConstructionLineWidth": 1.8,
        "PointDiameter": 10.0,
        "UseDataDefinedColors": false
      }})");

  m_view = new QtNodes::GraphicsView(m_scene);
  m_view->setFocusPolicy(Qt::StrongFocus);
  m_view->viewport()->setFocusPolicy(Qt::StrongFocus);
  m_view->viewport()->installEventFilter(this);

  m_presetDir =
      QStandardPaths::writableLocation(QStandardPaths::AppConfigLocation) +
      QStringLiteral("/presets");

  m_sidebar = new QTabWidget();
  m_sidebar->setTabPosition(QTabWidget::North);
  m_sidebar->setDocumentMode(true);
  m_sidebar->setStyleSheet(QStringLiteral(
      "QTabWidget::pane { border: none; background: #1a1a1e; }"
      "QTabBar::tab { background: #24242a; color: #a0a8b6; padding: 8px 16px;"
      "  border: none; border-bottom: 2px solid transparent; }"
      "QTabBar::tab:selected { color: #ecf0f6;"
      "  border-bottom: 2px solid #ffa500; }"
      "QTabBar::tab:hover { background: #2e2e36; }"));

  auto *presetsTab = new QWidget();
  auto *presetsLayout = new QVBoxLayout(presetsTab);
  presetsLayout->setContentsMargins(8, 8, 8, 8);
  presetsLayout->setSpacing(6);

  auto *savePresetBtn = new QPushButton(QStringLiteral("Save Preset..."));
  savePresetBtn->setStyleSheet(QStringLiteral(
      "QPushButton { background: #2e2e36; color: #ecf0f6; border: 1px solid #3a3a44;"
      "  border-radius: 4px; padding: 6px 12px; }"
      "QPushButton:hover { background: #3a3a44; }"
      "QPushButton:pressed { background: #44444e; }"));
  connect(savePresetBtn, &QPushButton::clicked, this,
          &GraphEditorWidget::savePreset);

  auto *loadPresetBtn = new QPushButton(QStringLiteral("Load Preset..."));
  loadPresetBtn->setStyleSheet(savePresetBtn->styleSheet());
  connect(loadPresetBtn, &QPushButton::clicked, this,
          &GraphEditorWidget::loadPreset);

  presetsLayout->addWidget(savePresetBtn);
  presetsLayout->addWidget(loadPresetBtn);
  presetsLayout->addStretch();

  m_sidebar->addTab(presetsTab, QStringLiteral("PRESETS"));

  m_splitter = new QSplitter(Qt::Horizontal);
  m_splitter->addWidget(m_view);
  m_splitter->addWidget(m_sidebar);
  m_splitter->setStretchFactor(0, 1);
  m_splitter->setStretchFactor(1, 0);
  m_splitter->setSizes({1200, 320});
  m_splitter->setStyleSheet(QStringLiteral(
      "QSplitter::handle { background: #2a2a32; width: 2px; }"));

  auto *layout = new QVBoxLayout(this);
  layout->setContentsMargins(0, 0, 0, 0);
  layout->addWidget(m_splitter);

  m_view->setContextMenuPolicy(Qt::CustomContextMenu);
  connect(m_view, &QWidget::customContextMenuRequested, this,
          &GraphEditorWidget::onContextMenuRequested);

  removeDefaultActions();

  auto *deleteAction =
      new QAction(QStringLiteral("Delete Selection"), m_view);
  deleteAction->setShortcut(QKeySequence::Delete);
  deleteAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(deleteAction, &QAction::triggered, this,
          &GraphEditorWidget::deleteSelection);
  m_view->addAction(deleteAction);

  auto *copyAction =
      new QAction(QStringLiteral("Copy Selection"), m_view);
  copyAction->setShortcut(QKeySequence::Copy);
  copyAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(copyAction, &QAction::triggered, this,
          &GraphEditorWidget::copySelection);
  m_view->addAction(copyAction);

  auto *pasteAction =
      new QAction(QStringLiteral("Paste Selection"), m_view);
  pasteAction->setShortcut(QKeySequence::Paste);
  pasteAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(pasteAction, &QAction::triggered, this,
          [this]() { pasteSelection(QPointF(30, 30)); });
  m_view->addAction(pasteAction);

  auto *duplicateAction =
      new QAction(QStringLiteral("Duplicate Selection"), m_view);
  duplicateAction->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_D));
  duplicateAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(duplicateAction, &QAction::triggered, this,
          &GraphEditorWidget::duplicateSelection);
  m_view->addAction(duplicateAction);

  auto *autoArrangeAction =
      new QAction(QStringLiteral("Auto-Arrange"), m_view);
  autoArrangeAction->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_L));
  autoArrangeAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(autoArrangeAction, &QAction::triggered, this, [this]() {
    m_model->autoArrange();
    saveLayoutWithViewState();
  });
  m_view->addAction(autoArrangeAction);

  auto *selectAllAction =
      new QAction(QStringLiteral("Select All"), m_view);
  selectAllAction->setShortcut(QKeySequence::SelectAll);
  selectAllAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(selectAllAction, &QAction::triggered, this, [this]() {
    for (auto *item : m_scene->items()) {
      item->setSelected(true);
    }
  });
  m_view->addAction(selectAllAction);

  auto *deselectAllAction =
      new QAction(QStringLiteral("Deselect All"), m_view);
  deselectAllAction->setShortcut(
      QKeySequence(Qt::CTRL | Qt::SHIFT | Qt::Key_A));
  deselectAllAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(deselectAllAction, &QAction::triggered, m_scene,
          &QGraphicsScene::clearSelection);
  m_view->addAction(deselectAllAction);

  auto *zoomFitAllAction =
      new QAction(QStringLiteral("Zoom Fit All"), m_view);
  zoomFitAllAction->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_F));
  zoomFitAllAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(zoomFitAllAction, &QAction::triggered, m_view,
          &QtNodes::GraphicsView::zoomFitAll);
  m_view->addAction(zoomFitAllAction);

  auto *zoomFitSelectedAction =
      new QAction(QStringLiteral("Zoom Fit Selected"), m_view);
  zoomFitSelectedAction->setShortcut(QKeySequence(Qt::Key_F));
  zoomFitSelectedAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(zoomFitSelectedAction, &QAction::triggered, m_view,
          &QtNodes::GraphicsView::zoomFitSelected);
  m_view->addAction(zoomFitSelectedAction);

  auto *refreshAction =
      new QAction(QStringLiteral("Refresh Graph"), m_view);
  refreshAction->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_R));
  refreshAction->setShortcutContext(Qt::WidgetWithChildrenShortcut);
  connect(refreshAction, &QAction::triggered, this, [this]() {
    m_model->refreshFromClient();
  });
  m_view->addAction(refreshAction);

  connect(m_model, &WarpGraphModel::nodePositionUpdated, this,
          &GraphEditorWidget::scheduleSaveLayout);
  connect(m_model, &QtNodes::AbstractGraphModel::nodeCreated, this,
          &GraphEditorWidget::scheduleSaveLayout);
  connect(m_model, &QtNodes::AbstractGraphModel::nodeDeleted, this,
          &GraphEditorWidget::scheduleSaveLayout);
  connect(m_model, &QtNodes::AbstractGraphModel::nodeUpdated, this,
          &GraphEditorWidget::scheduleSaveLayout);

  m_saveTimer = new QTimer(this);
  m_saveTimer->setSingleShot(true);
  m_saveTimer->setInterval(1000);
  connect(m_saveTimer, &QTimer::timeout, this,
          &GraphEditorWidget::saveLayoutWithViewState);

  m_model->refreshFromClient();
  if (!hasLayout) {
    m_model->autoArrange();
  }

  QTimer::singleShot(0, this, &GraphEditorWidget::restoreViewState);

  if (m_model->allNodeIds().size() > 0) {
    m_graphReady = true;
    Q_EMIT graphReady();
  }

  connect(QCoreApplication::instance(), &QCoreApplication::aboutToQuit, this,
          &GraphEditorWidget::saveLayoutWithViewState);

  m_refreshTimer = new QTimer(this);
  connect(m_refreshTimer, &QTimer::timeout, this,
          &GraphEditorWidget::onRefreshTimer);
  m_refreshTimer->start(500);
}

void GraphEditorWidget::onRefreshTimer() {
  m_model->refreshFromClient();

  if (!m_graphReady && m_model->allNodeIds().size() > 0) {
    m_graphReady = true;
    Q_EMIT graphReady();
    captureDebugScreenshot("initial_load");
  }
}

void GraphEditorWidget::scheduleSaveLayout() {
  if (!m_saveTimer->isActive()) {
    m_saveTimer->start();
  }
}

int GraphEditorWidget::nodeCount() const {
  return static_cast<int>(m_model->allNodeIds().size());
}

int GraphEditorWidget::linkCount() const {
  int count = 0;
  for (auto nodeId : m_model->allNodeIds()) {
    count += static_cast<int>(
        m_model->allConnectionIds(nodeId).size());
  }
  return count / 2;
}

void GraphEditorWidget::setDebugScreenshotDir(const QString &dir) {
  m_debugScreenshotDir = dir;
  QDir d(dir);
  if (!d.exists()) {
    d.mkpath(".");
  }

  connect(m_model, &QtNodes::AbstractGraphModel::nodeCreated, this, [this]() {
    captureDebugScreenshot("node_added");
  });
  connect(m_model, &QtNodes::AbstractGraphModel::nodeDeleted, this, [this]() {
    captureDebugScreenshot("node_removed");
  });
  connect(m_model, &QtNodes::AbstractGraphModel::connectionCreated, this,
          [this]() { captureDebugScreenshot("connection_added"); });
  connect(m_model, &QtNodes::AbstractGraphModel::connectionDeleted, this,
          [this]() { captureDebugScreenshot("connection_removed"); });
  connect(m_model, &QtNodes::AbstractGraphModel::nodeUpdated, this, [this]() {
    captureDebugScreenshot("node_updated");
  });

  if (m_graphReady) {
    QTimer::singleShot(200, this, [this]() {
      captureDebugScreenshot("initial_load");
    });
  }
}

void GraphEditorWidget::captureDebugScreenshot(const QString &event) {
  if (m_debugScreenshotDir.isEmpty()) {
    return;
  }

  QWidget *win = window();
  if (!win) {
    return;
  }

  QPixmap pixmap = win->grab();
  if (pixmap.isNull()) {
    return;
  }

  QString timestamp =
      QDateTime::currentDateTime().toString("yyyyMMdd_HHmmss");
  QString filename = QString("warppipe_%1_%2.png").arg(timestamp, event);
  pixmap.save(m_debugScreenshotDir + "/" + filename);
}

bool GraphEditorWidget::eventFilter(QObject *obj, QEvent *event) {
  if (obj != m_view->viewport()) {
    return QWidget::eventFilter(obj, event);
  }
  if (event->type() == QEvent::ContextMenu) {
    auto *cme = static_cast<QContextMenuEvent *>(event);
    m_lastContextMenuScenePos = m_view->mapToScene(cme->pos());
  } else if (event->type() == QEvent::MouseButtonPress) {
    auto *me = static_cast<QMouseEvent *>(event);
    if (me->button() == Qt::MiddleButton) {
      m_view->centerOn(m_view->mapToScene(me->pos()));
      return true;
    }
  }
  return QWidget::eventFilter(obj, event);
}

void GraphEditorWidget::onContextMenuRequested(const QPoint &pos) {
  QPointF scenePos = m_view->mapToScene(pos);
  m_lastContextMenuScenePos = scenePos;

  uint32_t hitPwNodeId = 0;
  QtNodes::NodeId hitQtNodeId = 0;
  for (auto nodeId : m_model->allNodeIds()) {
    const WarpNodeData *data = m_model->warpNodeData(nodeId);
    if (!data) {
      continue;
    }
    QPointF nodePos =
        m_model->nodeData(nodeId, QtNodes::NodeRole::Position).toPointF();
    QSize nodeSize =
        m_model->nodeData(nodeId, QtNodes::NodeRole::Size).toSize();
    QRectF nodeRect(nodePos, QSizeF(nodeSize));
    if (nodeRect.contains(scenePos)) {
      hitPwNodeId = data->info.id.value;
      hitQtNodeId = nodeId;
      break;
    }
  }

  QPoint screenPos = m_view->mapToGlobal(pos);
  if (hitPwNodeId != 0) {
    showNodeContextMenu(screenPos, hitPwNodeId, hitQtNodeId);
  } else {
    showCanvasContextMenu(screenPos, scenePos);
  }
}

void GraphEditorWidget::showCanvasContextMenu(const QPoint &screenPos,
                                               const QPointF &scenePos) {
  QMenu menu;
  QAction *createSink = menu.addAction(QStringLiteral("Create Virtual Sink"));
  QAction *createSource =
      menu.addAction(QStringLiteral("Create Virtual Source"));
  menu.addSeparator();
  QAction *pasteAction = menu.addAction(QStringLiteral("Paste"));
  pasteAction->setShortcut(QKeySequence::Paste);
  pasteAction->setEnabled(!m_clipboardJson.isEmpty() ||
                          (QGuiApplication::clipboard()->mimeData() &&
                           QGuiApplication::clipboard()->mimeData()->hasFormat(
                               QStringLiteral(
                                   "application/warppipe-virtual-graph"))));
  menu.addSeparator();
  QAction *selectAll = menu.addAction(QStringLiteral("Select All"));
  selectAll->setShortcut(QKeySequence::SelectAll);
  QAction *deselectAll = menu.addAction(QStringLiteral("Deselect All"));
  deselectAll->setShortcut(QKeySequence(Qt::CTRL | Qt::SHIFT | Qt::Key_A));
  menu.addSeparator();
  QAction *zoomFitAll = menu.addAction(QStringLiteral("Zoom Fit All"));
  zoomFitAll->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_F));
  QAction *zoomFitSelected = menu.addAction(QStringLiteral("Zoom Fit Selected"));
  zoomFitSelected->setShortcut(QKeySequence(Qt::Key_F));
  menu.addSeparator();
  QAction *autoArrange = menu.addAction(QStringLiteral("Auto-Arrange"));
  autoArrange->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_L));
  QAction *refreshGraph = menu.addAction(QStringLiteral("Refresh Graph"));
  refreshGraph->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_R));
  menu.addSeparator();
  QAction *saveLayoutAs = menu.addAction(QStringLiteral("Save Layout As..."));
  QAction *resetLayout = menu.addAction(QStringLiteral("Reset Layout"));
  menu.addSeparator();
  QAction *savePresetAction = menu.addAction(QStringLiteral("Save Preset..."));
  QAction *loadPresetAction = menu.addAction(QStringLiteral("Load Preset..."));

  QAction *chosen = menu.exec(screenPos);
  if (chosen == createSink) {
    createVirtualNode(true, scenePos);
  } else if (chosen == createSource) {
    createVirtualNode(false, scenePos);
  } else if (chosen == pasteAction) {
    pasteSelection(QPointF(0, 0));
  } else if (chosen == selectAll) {
    for (auto *item : m_scene->items()) {
      item->setSelected(true);
    }
  } else if (chosen == deselectAll) {
    m_scene->clearSelection();
  } else if (chosen == zoomFitAll) {
    m_view->zoomFitAll();
  } else if (chosen == zoomFitSelected) {
    m_view->zoomFitSelected();
  } else if (chosen == autoArrange) {
    m_model->autoArrange();
    saveLayoutWithViewState();
  } else if (chosen == refreshGraph) {
    m_model->refreshFromClient();
  } else if (chosen == saveLayoutAs) {
    QString path = QFileDialog::getSaveFileName(
        this, QStringLiteral("Save Layout As"), QString(),
        QStringLiteral("JSON files (*.json)"));
    if (!path.isEmpty()) {
      saveLayoutWithViewState();
      m_model->saveLayout(path);
    }
  } else if (chosen == resetLayout) {
    m_model->clearSavedPositions();
    m_model->autoArrange();
    m_view->zoomFitAll();
    saveLayoutWithViewState();
  } else if (chosen == savePresetAction) {
    savePreset();
  } else if (chosen == loadPresetAction) {
    loadPreset();
  }
}

void GraphEditorWidget::showNodeContextMenu(const QPoint &screenPos,
                                            uint32_t pwNodeId,
                                            QtNodes::NodeId qtNodeId) {
  const WarpNodeData *data = m_model->warpNodeData(qtNodeId);
  if (!data) {
    return;
  }

  WarpNodeType type = WarpGraphModel::classifyNode(data->info);
  bool isVirtual =
      type == WarpNodeType::kVirtualSink || type == WarpNodeType::kVirtualSource;

  QMenu menu;

  QAction *copyAction = nullptr;
  QAction *duplicateAction = nullptr;
  QAction *deleteAction = nullptr;

  if (isVirtual) {
    copyAction = menu.addAction(QStringLiteral("Copy"));
    copyAction->setShortcut(QKeySequence::Copy);
    duplicateAction = menu.addAction(QStringLiteral("Duplicate"));
    duplicateAction->setShortcut(QKeySequence(Qt::CTRL | Qt::Key_D));
    menu.addSeparator();
    deleteAction = menu.addAction(QStringLiteral("Delete"));
    deleteAction->setShortcut(QKeySequence::Delete);
  }

  QAction *pasteAction = menu.addAction(QStringLiteral("Paste"));
  pasteAction->setShortcut(QKeySequence::Paste);
  pasteAction->setEnabled(!m_clipboardJson.isEmpty() ||
                          (QGuiApplication::clipboard()->mimeData() &&
                           QGuiApplication::clipboard()->mimeData()->hasFormat(
                               QStringLiteral(
                                   "application/warppipe-virtual-graph"))));

  QAction *chosen = menu.exec(screenPos);
  if (!chosen) {
    return;
  }
  if (chosen == copyAction) {
    copySelection();
  } else if (chosen == duplicateAction) {
    duplicateSelection();
  } else if (chosen == deleteAction && m_client) {
    deleteSelection();
  } else if (chosen == pasteAction) {
    pasteSelection(QPointF(0, 0));
  }
}

void GraphEditorWidget::createVirtualNode(bool isSink,
                                          const QPointF &scenePos) {
  QString label = isSink ? QStringLiteral("Create Virtual Sink")
                         : QStringLiteral("Create Virtual Source");
  bool ok = false;
  QString name = QInputDialog::getText(this, label,
                                       QStringLiteral("Node name:"),
                                       QLineEdit::Normal, QString(), &ok);
  if (!ok || name.trimmed().isEmpty()) {
    return;
  }

  std::string nodeName = name.trimmed().toStdString();
  m_model->setPendingPosition(nodeName, scenePos);

  warppipe::Status status;
  if (isSink) {
    auto result = m_client->CreateVirtualSink(nodeName);
    status = result.status;
  } else {
    auto result = m_client->CreateVirtualSource(nodeName);
    status = result.status;
  }

  if (!status.ok()) {
    QMessageBox::warning(this, QStringLiteral("Error"),
                         QString::fromStdString(status.message));
    return;
  }

  m_model->refreshFromClient();
}

void GraphEditorWidget::removeDefaultActions() {
  const QList<QAction *> actions = m_view->actions();
  for (QAction *action : actions) {
    const QString text = action->text();
    if (text.contains(QStringLiteral("Copy Selection")) ||
        text.contains(QStringLiteral("Paste Selection")) ||
        text.contains(QStringLiteral("Duplicate Selection")) ||
        text.contains(QStringLiteral("Delete Selection"))) {
      m_view->removeAction(action);
      action->deleteLater();
    }
  }
}

void GraphEditorWidget::deleteSelection() {
  if (!m_scene) {
    return;
  }

  const QList<QGraphicsItem *> items = m_scene->selectedItems();
  QList<QtNodes::NodeId> virtualNodeIds;
  bool hasSelectedConnections = false;

  for (auto *item : items) {
    if (auto *nodeObj =
            qgraphicsitem_cast<QtNodes::NodeGraphicsObject *>(item)) {
      const WarpNodeData *data = m_model->warpNodeData(nodeObj->nodeId());
      if (!data)
        continue;
      WarpNodeType type = WarpGraphModel::classifyNode(data->info);
      if (type == WarpNodeType::kVirtualSink ||
          type == WarpNodeType::kVirtualSource) {
        virtualNodeIds.append(nodeObj->nodeId());
      }
    } else if (qgraphicsitem_cast<QtNodes::ConnectionGraphicsObject *>(
                   item)) {
      hasSelectedConnections = true;
    }
  }

  if (!virtualNodeIds.isEmpty()) {
    m_scene->undoStack().push(
        new DeleteVirtualNodeCommand(this, virtualNodeIds));
  }

  if (virtualNodeIds.isEmpty() && hasSelectedConnections) {
    m_scene->undoStack().push(new QtNodes::DeleteCommand(m_scene));
  }
}

void GraphEditorWidget::copySelection() {
  if (!m_scene || !m_client) {
    return;
  }

  QJsonArray nodesJson;
  std::unordered_set<std::string> selectedNames;
  QPointF sum;
  int count = 0;

  const QList<QGraphicsItem *> items = m_scene->selectedItems();
  for (auto *item : items) {
    auto *nodeObj =
        qgraphicsitem_cast<QtNodes::NodeGraphicsObject *>(item);
    if (!nodeObj)
      continue;

    const WarpNodeData *data = m_model->warpNodeData(nodeObj->nodeId());
    if (!data)
      continue;

    WarpNodeType type = WarpGraphModel::classifyNode(data->info);
    if (type != WarpNodeType::kVirtualSink &&
        type != WarpNodeType::kVirtualSource)
      continue;

    QJsonObject nodeJson;
    nodeJson[QStringLiteral("name")] =
        QString::fromStdString(data->info.name);
    nodeJson[QStringLiteral("media_class")] =
        QString::fromStdString(data->info.media_class);
    int channels = static_cast<int>(
        std::max(data->inputPorts.size(), data->outputPorts.size()));
    nodeJson[QStringLiteral("channels")] = channels > 0 ? channels : 2;
    QPointF pos =
        m_model->nodeData(nodeObj->nodeId(), QtNodes::NodeRole::Position)
            .toPointF();
    nodeJson[QStringLiteral("x")] = pos.x();
    nodeJson[QStringLiteral("y")] = pos.y();

    nodesJson.append(nodeJson);
    selectedNames.insert(data->info.name);
    sum += pos;
    ++count;
  }

  if (nodesJson.isEmpty()) {
    return;
  }

  std::unordered_map<uint32_t, std::pair<std::string, std::string>> portOwner;
  for (auto qtId : m_model->allNodeIds()) {
    const WarpNodeData *data = m_model->warpNodeData(qtId);
    if (!data || selectedNames.find(data->info.name) == selectedNames.end())
      continue;
    for (const auto &port : data->outputPorts) {
      portOwner[port.id.value] = {data->info.name, port.name};
    }
    for (const auto &port : data->inputPorts) {
      portOwner[port.id.value] = {data->info.name, port.name};
    }
  }

  QJsonArray linksJson;
  auto linksResult = m_client->ListLinks();
  if (linksResult.ok()) {
    for (const auto &link : linksResult.value) {
      auto outIt = portOwner.find(link.output_port.value);
      auto inIt = portOwner.find(link.input_port.value);
      if (outIt != portOwner.end() && inIt != portOwner.end()) {
        QJsonObject linkJson;
        linkJson[QStringLiteral("source")] = QString::fromStdString(
            outIt->second.first + ":" + outIt->second.second);
        linkJson[QStringLiteral("target")] = QString::fromStdString(
            inIt->second.first + ":" + inIt->second.second);
        linksJson.append(linkJson);
      }
    }
  }

  QJsonObject root;
  root[QStringLiteral("nodes")] = nodesJson;
  root[QStringLiteral("links")] = linksJson;
  root[QStringLiteral("center_x")] = count > 0 ? sum.x() / count : 0.0;
  root[QStringLiteral("center_y")] = count > 0 ? sum.y() / count : 0.0;
  root[QStringLiteral("version")] = 1;

  m_clipboardJson = root;

  QJsonDocument doc(root);
  auto *mime = new QMimeData();
  mime->setData(QStringLiteral("application/warppipe-virtual-graph"),
                doc.toJson(QJsonDocument::Compact));
  mime->setText(QString::fromUtf8(doc.toJson(QJsonDocument::Compact)));
  QGuiApplication::clipboard()->setMimeData(mime);
}

void GraphEditorWidget::pasteSelection(const QPointF &offset) {
  if (!m_client || !m_model) {
    return;
  }

  QJsonObject root;
  const QMimeData *mime = QGuiApplication::clipboard()->mimeData();
  if (mime &&
      mime->hasFormat(
          QStringLiteral("application/warppipe-virtual-graph"))) {
    root = QJsonDocument::fromJson(
               mime->data(QStringLiteral(
                   "application/warppipe-virtual-graph")))
               .object();
  } else if (!m_clipboardJson.isEmpty()) {
    root = m_clipboardJson;
  }

  if (root.isEmpty()) {
    return;
  }

  std::unordered_set<std::string> existingNames;
  auto nodesResult = m_client->ListNodes();
  if (nodesResult.ok()) {
    for (const auto &node : nodesResult.value) {
      existingNames.insert(node.name);
    }
  }

  std::unordered_map<std::string, std::string> nameMap;

  const QJsonArray nodesArray =
      root[QStringLiteral("nodes")].toArray();
  for (const auto &entry : nodesArray) {
    QJsonObject nodeObj = entry.toObject();
    std::string baseName =
        nodeObj[QStringLiteral("name")].toString().toStdString();
    std::string mediaClass =
        nodeObj[QStringLiteral("media_class")].toString().toStdString();
    double x = nodeObj[QStringLiteral("x")].toDouble();
    double y = nodeObj[QStringLiteral("y")].toDouble();

    if (baseName.empty())
      continue;

    std::string newName = baseName + " Copy";
    int suffix = 2;
    while (existingNames.count(newName)) {
      newName = baseName + " Copy " + std::to_string(suffix++);
    }
    existingNames.insert(newName);
    nameMap[baseName] = newName;

    m_model->setPendingPosition(newName, QPointF(x, y) + offset);

    bool isSink =
        mediaClass == "Audio/Sink" || mediaClass == "Audio/Duplex";
    if (isSink) {
      m_client->CreateVirtualSink(newName);
    } else {
      m_client->CreateVirtualSource(newName);
    }
  }

  const QJsonArray linksArray =
      root[QStringLiteral("links")].toArray();
  for (const auto &entry : linksArray) {
    QJsonObject linkObj = entry.toObject();
    std::string source =
        linkObj[QStringLiteral("source")].toString().toStdString();
    std::string target =
        linkObj[QStringLiteral("target")].toString().toStdString();

    auto splitKey = [](const std::string &s)
        -> std::pair<std::string, std::string> {
      auto pos = s.rfind(':');
      if (pos == std::string::npos)
        return {s, ""};
      return {s.substr(0, pos), s.substr(pos + 1)};
    };

    auto [outName, outPort] = splitKey(source);
    auto [inName, inPort] = splitKey(target);

    auto outIt = nameMap.find(outName);
    auto inIt = nameMap.find(inName);
    if (outIt == nameMap.end() || inIt == nameMap.end())
      continue;

    PendingPasteLink pending;
    pending.outNodeName = outIt->second;
    pending.outPortName = outPort;
    pending.inNodeName = inIt->second;
    pending.inPortName = inPort;
    m_pendingPasteLinks.push_back(pending);
  }

  m_model->refreshFromClient();
  tryResolvePendingLinks();
}

void GraphEditorWidget::duplicateSelection() {
  copySelection();
  pasteSelection(QPointF(40, 40));
}

void GraphEditorWidget::tryResolvePendingLinks() {
  if (m_pendingPasteLinks.empty() || !m_client) {
    return;
  }

  auto nodesResult = m_client->ListNodes();
  if (!nodesResult.ok()) {
    return;
  }

  std::vector<PendingPasteLink> remaining;

  for (const auto &pending : m_pendingPasteLinks) {
    warppipe::PortId outPortId{0};
    warppipe::PortId inPortId{0};
    bool foundOut = false;
    bool foundIn = false;

    for (const auto &node : nodesResult.value) {
      if (!foundOut && node.name == pending.outNodeName) {
        auto portsResult = m_client->ListPorts(node.id);
        if (portsResult.ok()) {
          for (const auto &port : portsResult.value) {
            if (!port.is_input && port.name == pending.outPortName) {
              outPortId = port.id;
              foundOut = true;
              break;
            }
          }
        }
      }
      if (!foundIn && node.name == pending.inNodeName) {
        auto portsResult = m_client->ListPorts(node.id);
        if (portsResult.ok()) {
          for (const auto &port : portsResult.value) {
            if (port.is_input && port.name == pending.inPortName) {
              inPortId = port.id;
              foundIn = true;
              break;
            }
          }
        }
      }
    }

    if (foundOut && foundIn) {
      m_client->CreateLink(outPortId, inPortId, warppipe::LinkOptions{});
    } else {
      remaining.push_back(pending);
    }
  }

  m_pendingPasteLinks = remaining;
}

void GraphEditorWidget::saveLayoutWithViewState() {
  WarpGraphModel::ViewState vs;
  vs.scale = m_view->getScale();
  QPointF center = m_view->mapToScene(m_view->viewport()->rect().center());
  vs.centerX = center.x();
  vs.centerY = center.y();
  QList<int> sizes = m_splitter->sizes();
  vs.splitterGraph = sizes.value(0, 1200);
  vs.splitterSidebar = sizes.value(1, 320);
  vs.valid = true;
  m_model->saveLayout(m_layoutPath, vs);
}

void GraphEditorWidget::restoreViewState() {
  auto vs = m_model->savedViewState();
  if (vs.valid) {
    m_view->setupScale(vs.scale);
    m_view->centerOn(QPointF(vs.centerX, vs.centerY));
    if (vs.splitterGraph > 0 || vs.splitterSidebar > 0) {
      m_splitter->setSizes({vs.splitterGraph, vs.splitterSidebar});
    }
  } else {
    m_view->zoomFitAll();
  }
}

void GraphEditorWidget::savePreset() {
  QDir dir(m_presetDir);
  if (!dir.exists())
    dir.mkpath(".");

  QString path = QFileDialog::getSaveFileName(
      this, QStringLiteral("Save Preset"), m_presetDir,
      QStringLiteral("JSON files (*.json)"));
  if (path.isEmpty())
    return;
  if (!path.endsWith(QStringLiteral(".json"), Qt::CaseInsensitive))
    path += QStringLiteral(".json");

  if (PresetManager::savePreset(path, m_client, m_model)) {
    if (auto *mw = qobject_cast<QMainWindow *>(window()))
      mw->statusBar()->showMessage(
          QStringLiteral("Preset saved: ") + QFileInfo(path).fileName(), 4000);
  } else {
    QMessageBox::warning(this, QStringLiteral("Error"),
                         QStringLiteral("Failed to save preset."));
  }
}

void GraphEditorWidget::loadPreset() {
  QString path = QFileDialog::getOpenFileName(
      this, QStringLiteral("Load Preset"), m_presetDir,
      QStringLiteral("JSON files (*.json)"));
  if (path.isEmpty())
    return;

  if (PresetManager::loadPreset(path, m_client, m_model)) {
    if (auto *mw = qobject_cast<QMainWindow *>(window()))
      mw->statusBar()->showMessage(
          QStringLiteral("Preset loaded: ") + QFileInfo(path).fileName(), 4000);
  } else {
    QMessageBox::warning(this, QStringLiteral("Error"),
                         QStringLiteral("Failed to load preset."));
  }
}