From bb62d7fb614e260c1695ef9161d4334d520fb0b7 Mon Sep 17 00:00:00 2001
From: Alexandre Tolstenko <tolstenko@gmail.com>
Date: Wed, 12 Jun 2024 12:21:47 -0400
Subject: [PATCH] fix(timer): add timer class

---
 .../RecursiveBacktrackerExample.cpp           |  1 +
 modules/time/Time.cpp                         |  6 +-
 modules/time/Time.h                           |  4 +-
 modules/time/Timer.cpp                        | 39 +++++++++++++
 modules/time/Timer.h                          | 56 +++++++++++++++++++
 5 files changed, 102 insertions(+), 4 deletions(-)
 create mode 100644 modules/time/Timer.cpp
 create mode 100644 modules/time/Timer.h

diff --git a/examples/maze/generators/RecursiveBacktrackerExample.cpp b/examples/maze/generators/RecursiveBacktrackerExample.cpp
index 778dae13..b200999f 100644
--- a/examples/maze/generators/RecursiveBacktrackerExample.cpp
+++ b/examples/maze/generators/RecursiveBacktrackerExample.cpp
@@ -18,6 +18,7 @@ void RecursiveBacktrackerExample::Clear(World* world) {
     }
   }
 }
+
 Point2D RecursiveBacktrackerExample::randomStartPoint(World* world) {
   auto sideOver2 = world->GetSize() / 2;
 
diff --git a/modules/time/Time.cpp b/modules/time/Time.cpp
index dc3a1850..2f884ebf 100644
--- a/modules/time/Time.cpp
+++ b/modules/time/Time.cpp
@@ -6,7 +6,11 @@
 #include "TimeDefs.h"
 #include "Time.h"
 namespace MoBaGEn::TimeManager {
-  Duration Time::GetElapsedTime() { return Now() - m_startTime; }
+  Duration Time::GetElapsedTime() { return Now() - startTime(); }
 
   TimePoint Time::Now() { return std::chrono::high_resolution_clock::now(); }
+  TimePoint Time::startTime() {
+    static const auto time = Now();
+    return time;
+  }
 }  // namespace MoBaGEn::TimeManager
\ No newline at end of file
diff --git a/modules/time/Time.h b/modules/time/Time.h
index 215ee9c6..e65b6d77 100644
--- a/modules/time/Time.h
+++ b/modules/time/Time.h
@@ -12,18 +12,16 @@ namespace MoBaGEn::TimeManager {
   public:
     /**
      * @brief Get the current wall time
-     *
      * @return TimePoint
      */
     static TimePoint Now();
 
   private:
-    static inline TimePoint m_startTime = Now();
+    static TimePoint startTime();
 
   public:
     /**
      * @brief Get the Elapsed Time since the start of the program
-     *
      * @return Duration
      */
     static Duration GetElapsedTime();
diff --git a/modules/time/Timer.cpp b/modules/time/Timer.cpp
new file mode 100644
index 00000000..d4d792b4
--- /dev/null
+++ b/modules/time/Timer.cpp
@@ -0,0 +1,39 @@
+//
+// Created by Alexandre Tolstenko Nogueira on 2024.06.12.
+//
+
+#include "TimeDefs.h"
+#include "Time.h"
+#include "Timer.h"
+#include <stdexcept>
+
+namespace MoBaGEn::TimeManager {
+  Timer::Timer(bool startOnCreation) {
+    if (startOnCreation) {
+      Start();
+    }
+  }
+
+  void Timer::Start() {
+    if (!m_running) {
+      m_startTime = Time::Now();
+      m_running = true;
+    } else {
+      throw std::runtime_error("Timer already running");
+    }
+  }
+
+  Duration Timer::Stop() {
+    if (m_running) {
+      m_elapsedTime += Time::Now() - m_startTime;
+      m_running = false;
+    }
+    return m_elapsedTime;
+  }
+
+  void Timer::Reset() {
+    m_elapsedTime = Duration(0);
+    Start();
+  }
+
+}  // namespace MoBaGEn::TimeManager
\ No newline at end of file
diff --git a/modules/time/Timer.h b/modules/time/Timer.h
new file mode 100644
index 00000000..b39d4a50
--- /dev/null
+++ b/modules/time/Timer.h
@@ -0,0 +1,56 @@
+//
+// Created by Alexandre Tolstenko Nogueira on 2024.06.12.
+//
+
+#ifndef MOBAGEN_TIMER_H
+#define MOBAGEN_TIMER_H
+
+#include "TimeDefs.h"
+#include "Time.h"
+
+namespace MoBaGEn::TimeManager {
+  /**
+   * @brief Timer class
+   * @details A class to measure wall clock time
+   */
+  class Timer {
+  private:
+    TimePoint m_startTime = Time::Now();
+    Duration m_elapsedTime = Duration(0);
+    bool m_running = false;
+
+  public:
+    /**
+     * @brief Construct a new Timer object, by default it starts the timer
+     * @param startOnCreation Start the timer on creation
+     */
+    explicit Timer(bool startOnCreation = true);
+    ~Timer() = default;
+
+    // delete all implicit copy and move constructors
+    Timer(const Timer&) = delete;
+    Timer(Timer&&) = delete;
+    Timer& operator=(const Timer&) = delete;
+    Timer& operator=(Timer&&) = delete;
+
+    /**
+     * @brief Start or resume the timer
+     * @details It will update the start time and mark the timer as running
+     */
+    void Start();
+    /**
+     * @brief Stop or pause the timer
+     * @return Duration The elapsed time since the timer started
+     * @details It will update the elapsed time and mark the timer as not running, and return
+     */
+    Duration Stop();
+
+    /**
+     * @brief Reset the timer and restart it
+     * @details It will reset the elapsed time to 0 and start the timer
+     */
+    void Reset();
+  };
+}  // namespace MoBaGEn::TimeManager
+
+#endif  // MOBAGEN_TIMER_H