From 3423dfc4e50af0f0e48cfa510c784b4a0f204c65 Mon Sep 17 00:00:00 2001
From: Abdoulbari ZAKIR <azakir@neverhack.com>
Date: Mon, 20 Nov 2023 12:59:22 +0100
Subject: [PATCH] start Math log

---
 src/cpp/benders/logger/CMakeLists.txt         |  3 +-
 src/cpp/benders/logger/MathLogger.cpp         | 15 ++++++
 .../logger/include/logger/MathLogger.h        | 50 +++++++++++++++++++
 3 files changed, 67 insertions(+), 1 deletion(-)
 create mode 100644 src/cpp/benders/logger/MathLogger.cpp
 create mode 100644 src/cpp/benders/logger/include/logger/MathLogger.h

diff --git a/src/cpp/benders/logger/CMakeLists.txt b/src/cpp/benders/logger/CMakeLists.txt
index cd0bf4f45..d322c811a 100644
--- a/src/cpp/benders/logger/CMakeLists.txt
+++ b/src/cpp/benders/logger/CMakeLists.txt
@@ -5,7 +5,8 @@ add_library (logger_lib
         User.cpp
         UserFile.cpp
         CandidateLog.cpp
-        IterationResultLog.cpp )
+        IterationResultLog.cpp 
+        MathLogger.cpp )
 
 target_link_libraries (logger_lib
         PUBLIC
diff --git a/src/cpp/benders/logger/MathLogger.cpp b/src/cpp/benders/logger/MathLogger.cpp
new file mode 100644
index 000000000..eca640be7
--- /dev/null
+++ b/src/cpp/benders/logger/MathLogger.cpp
@@ -0,0 +1,15 @@
+#include "logger/MathLogger.h"
+
+#include <iostream>
+
+#include "LoggerUtils.h"
+void MathLogger::write_header() {}
+
+MathLoggerFile::MathLoggerFile(const std::filesystem::path &filename)
+    : MathLogger(&file_stream_) {
+  file_stream_.open(filename, std::ofstream::out | std::ofstream::app);
+  if (file_stream_.fail()) {
+    std::cerr << PrefixMessage(LogUtils::LOGLEVEL::ERR, data.CONTEXT)
+              << "Invalid file name passed as parameter" << std::endl;
+  }
+}
\ No newline at end of file
diff --git a/src/cpp/benders/logger/include/logger/MathLogger.h b/src/cpp/benders/logger/include/logger/MathLogger.h
new file mode 100644
index 000000000..bfb51cc9e
--- /dev/null
+++ b/src/cpp/benders/logger/include/logger/MathLogger.h
@@ -0,0 +1,50 @@
+
+#pragma once
+
+#include <filesystem>
+#include <fstream>
+
+struct MathLoggerData {
+  int iteration;
+  double lower_bound;
+  double upper_bound;
+  double best_upper_bound;
+  double optimality_gap;
+  double relative_gap;
+  int max_simplexiter;
+  int min_simplexiter;
+  int deletedcut;
+  double time_master;
+  double time_subproblems;
+  double alpha;
+  const std::string CONTEXT = "Benders";
+};
+
+class LogDestination {
+ public:
+  explicit LogDestination(std::ostream* stream) : stream_(stream) {}
+  template <class T>
+  std::ostream& operator<<(const T& obj) {
+    // write obj to stream
+    return (*stream_) << T;
+  }
+
+ private:
+  std::ostream* stream_;
+};
+
+struct MathLogger {
+  explicit MathLogger(std::ostream* stream) : log_destination(stream) {}
+  void write_header();
+
+  MathLoggerData data;
+  LogDestination log_destination;
+};
+
+class MathLoggerFile : public MathLogger {
+ public:
+  explicit MathLoggerFile(const std::filesystem::path& log_file);
+
+ private:
+  std::ofstream file_stream_;
+};
\ No newline at end of file