From fca6a6484e402323e8c593bc9dcbb37baa84e5fc Mon Sep 17 00:00:00 2001
From: Dan Paulat <dpaulat@gmail.com>
Date: Wed, 22 Nov 2023 07:27:37 -0600
Subject: [PATCH] Add position manager to handle location updates

---
 scwx-qt/scwx-qt.cmake                         |   2 +
 .../scwx/qt/manager/position_manager.cpp      | 121 ++++++++++++++++++
 .../scwx/qt/manager/position_manager.hpp      |  42 ++++++
 3 files changed, 165 insertions(+)
 create mode 100644 scwx-qt/source/scwx/qt/manager/position_manager.cpp
 create mode 100644 scwx-qt/source/scwx/qt/manager/position_manager.hpp

diff --git a/scwx-qt/scwx-qt.cmake b/scwx-qt/scwx-qt.cmake
index 0e53f5d7..0b59b326 100644
--- a/scwx-qt/scwx-qt.cmake
+++ b/scwx-qt/scwx-qt.cmake
@@ -76,6 +76,7 @@ set(SRC_GL_DRAW source/scwx/qt/gl/draw/draw_item.cpp
                 source/scwx/qt/gl/draw/rectangle.cpp)
 set(HDR_MANAGER source/scwx/qt/manager/font_manager.hpp
                 source/scwx/qt/manager/placefile_manager.hpp
+                source/scwx/qt/manager/position_manager.hpp
                 source/scwx/qt/manager/radar_product_manager.hpp
                 source/scwx/qt/manager/radar_product_manager_notifier.hpp
                 source/scwx/qt/manager/resource_manager.hpp
@@ -85,6 +86,7 @@ set(HDR_MANAGER source/scwx/qt/manager/font_manager.hpp
                 source/scwx/qt/manager/update_manager.hpp)
 set(SRC_MANAGER source/scwx/qt/manager/font_manager.cpp
                 source/scwx/qt/manager/placefile_manager.cpp
+                source/scwx/qt/manager/position_manager.cpp
                 source/scwx/qt/manager/radar_product_manager.cpp
                 source/scwx/qt/manager/radar_product_manager_notifier.cpp
                 source/scwx/qt/manager/resource_manager.cpp
diff --git a/scwx-qt/source/scwx/qt/manager/position_manager.cpp b/scwx-qt/source/scwx/qt/manager/position_manager.cpp
new file mode 100644
index 00000000..15f3bd09
--- /dev/null
+++ b/scwx-qt/source/scwx/qt/manager/position_manager.cpp
@@ -0,0 +1,121 @@
+#include <scwx/qt/manager/position_manager.hpp>
+#include <scwx/common/geographic.hpp>
+#include <scwx/util/logger.hpp>
+
+#include <set>
+
+#include <QGeoPositionInfoSource>
+
+namespace scwx
+{
+namespace qt
+{
+namespace manager
+{
+
+static const std::string logPrefix_ = "scwx::qt::manager::position_manager";
+static const auto        logger_    = scwx::util::Logger::Create(logPrefix_);
+
+class PositionManager::Impl
+{
+public:
+   explicit Impl(PositionManager* self) : self_ {self}
+   {
+      // TODO: macOS requires permission
+      geoPositionInfoSource_ =
+         QGeoPositionInfoSource::createDefaultSource(self);
+
+      if (geoPositionInfoSource_ != nullptr)
+      {
+         logger_->debug("Using position source: {}",
+                        geoPositionInfoSource_->sourceName().toStdString());
+
+         QObject::connect(geoPositionInfoSource_,
+                          &QGeoPositionInfoSource::positionUpdated,
+                          self_,
+                          [this](const QGeoPositionInfo& info)
+                          {
+                             auto coordinate = info.coordinate();
+
+                             if (coordinate != position_.coordinate())
+                             {
+                                logger_->debug("Position updated: {}, {}",
+                                               coordinate.latitude(),
+                                               coordinate.longitude());
+                             }
+
+                             position_ = info;
+
+                             Q_EMIT self_->PositionUpdated(info);
+                          });
+      }
+   }
+
+   ~Impl() {}
+
+   PositionManager* self_;
+
+   std::set<boost::uuids::uuid> uuids_ {};
+
+   QGeoPositionInfoSource* geoPositionInfoSource_ {};
+   QGeoPositionInfo        position_ {};
+};
+
+PositionManager::PositionManager() : p(std::make_unique<Impl>(this)) {}
+PositionManager::~PositionManager() = default;
+
+QGeoPositionInfo PositionManager::position() const
+{
+   return p->position_;
+}
+
+void PositionManager::TrackLocation(boost::uuids::uuid uuid,
+                                    bool               trackingEnabled)
+{
+   if (p->geoPositionInfoSource_ == nullptr)
+   {
+      return;
+   }
+
+   if (trackingEnabled)
+   {
+      if (p->uuids_.empty())
+      {
+         p->geoPositionInfoSource_->startUpdates();
+      }
+
+      p->uuids_.insert(uuid);
+   }
+   else
+   {
+      p->uuids_.erase(uuid);
+
+      if (p->uuids_.empty())
+      {
+         p->geoPositionInfoSource_->stopUpdates();
+      }
+   }
+}
+
+std::shared_ptr<PositionManager> PositionManager::Instance()
+{
+   static std::weak_ptr<PositionManager> positionManagerReference_ {};
+   static std::mutex                     instanceMutex_ {};
+
+   std::unique_lock lock(instanceMutex_);
+
+   std::shared_ptr<PositionManager> positionManager =
+      positionManagerReference_.lock();
+
+   if (positionManager == nullptr)
+   {
+      positionManager           = std::make_shared<PositionManager>();
+      positionManagerReference_ = positionManager;
+   }
+
+   return positionManager;
+}
+
+} // namespace manager
+} // namespace qt
+} // namespace scwx
diff --git a/scwx-qt/source/scwx/qt/manager/position_manager.hpp b/scwx-qt/source/scwx/qt/manager/position_manager.hpp
new file mode 100644
index 00000000..815b76c9
--- /dev/null
+++ b/scwx-qt/source/scwx/qt/manager/position_manager.hpp
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <memory>
+
+#include <boost/uuid/uuid.hpp>
+#include <QObject>
+
+class QGeoPositionInfo;
+
+namespace scwx
+{
+namespace qt
+{
+namespace manager
+{
+
+class PositionManager : public QObject
+{
+   Q_OBJECT
+   Q_DISABLE_COPY_MOVE(PositionManager)
+
+public:
+   explicit PositionManager();
+   ~PositionManager();
+
+   QGeoPositionInfo position() const;
+
+   void TrackLocation(boost::uuids::uuid uuid, bool trackingEnabled);
+
+   static std::shared_ptr<PositionManager> Instance();
+
+signals:
+   void PositionUpdated(const QGeoPositionInfo& info);
+
+private:
+   class Impl;
+   std::unique_ptr<Impl> p;
+};
+
+} // namespace manager
+} // namespace qt
+} // namespace scwx