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 // @(#)root/minuit2:$Id$
 // Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005
 
 /**********************************************************************
  *                                                                    *
  * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
  *                                                                    *
  **********************************************************************/
 
 #ifndef ROOT_Minuit2_MnPrint
 #define ROOT_Minuit2_MnPrint
 
 #include "Minuit2/MnConfig.h"
 
 #include <cassert>
 #include <ios>
 #include <iostream>
 #include <sstream>
 #include <string>
 #include <utility>
 #include <functional>
 
 namespace ROOT {
 namespace Minuit2 {
 
 /**
     define std::ostream operators for output
 */
 
 class FunctionMinimum;
 std::ostream &operator<<(std::ostream &, const FunctionMinimum &);
 
 class MinimumState;
 std::ostream &operator<<(std::ostream &, const MinimumState &);
 
 class MnUserParameters;
 std::ostream &operator<<(std::ostream &, const MnUserParameters &);
 
 class MnUserCovariance;
 std::ostream &operator<<(std::ostream &, const MnUserCovariance &);
 
 class MnGlobalCorrelationCoeff;
 std::ostream &operator<<(std::ostream &, const MnGlobalCorrelationCoeff &);
 
 class MnUserParameterState;
 std::ostream &operator<<(std::ostream &, const MnUserParameterState &);
 
 class MnMachinePrecision;
 std::ostream &operator<<(std::ostream &, const MnMachinePrecision &);
 
 class MinosError;
 std::ostream &operator<<(std::ostream &, const MinosError &);
 
 class ContoursError;
 std::ostream &operator<<(std::ostream &, const ContoursError &);
 
 // std::pair<double, double> is used by MnContour
 std::ostream &operator<<(std::ostream &os, const std::pair<double, double> &point);
 
 /* Design notes: 1) We want to delay the costly conversion from object references to
    strings to a point after we have decided whether or not to
    show that string to the user at all. 2) We want to offer a customization point for
    external libraries that want to replace the MnPrint logging. The actual
    implementation is in a separate file, MnPrintImpl.cxx file that external libraries
    can replace with their own implementation.
 */
 
 // logging class for messages of varying severity
 class MnPrint {
 public:
    // want this to be an enum class for strong typing...
    enum class Verbosity { Error = 0, Warn = 1, Info = 2, Debug = 3, Trace = 4 };
 
    // ...but also want the values accessible from MnPrint scope for convenience
    static constexpr auto eError = Verbosity::Error;
    static constexpr auto eWarn = Verbosity::Warn;
    static constexpr auto eInfo = Verbosity::Info;
    static constexpr auto eDebug = Verbosity::Debug;
    static constexpr auto eTrace = Verbosity::Trace;
 
    // used for one-line printing of fcn minimum state
    class Oneline {
    public:
       Oneline(double fcn, double edm, int ncalls, int iter = -1);
       Oneline(const MinimumState &state, int iter = -1);
       Oneline(const FunctionMinimum &fmin, int iter = -1);
 
    private:
       double fFcn, fEdm;
       int fNcalls, fIter;
 
       friend std::ostream &operator<<(std::ostream &os, const Oneline &x);
    };
 
    MnPrint(const char *prefix, int level = MnPrint::GlobalLevel());
    ~MnPrint();
 
    // set global print level and return the previous one
    static int SetGlobalLevel(int level);
 
    // return current global print level
    static int GlobalLevel();
 
    // Whether to show the full prefix stack or only the end
    static void ShowPrefixStack(bool yes);
 
    static void AddFilter(const char *prefix);
    static void ClearFilter();
 
    // set print level and return the previous one
    int SetLevel(int level);
 
    // return current print level
    int Level() const;
 
    template <class... Ts>
    void Error(const Ts &... args)
    {
       Log(eError, args...);
    }
 
    template <class... Ts>
    void Warn(const Ts &... args)
    {
       Log(eWarn, args...);
    }
 
    template <class... Ts>
    void Info(const Ts &... args)
    {
       Log(eInfo, args...);
    }
 
    template <class... Ts>
    void Debug(const Ts &... args)
    {
       Log(eDebug, args...);
    }
 
    template <class... Ts>
    void Trace(const Ts &... args)
    {
       Log(eTrace, args...);
    }
 
 private:
    // low level logging
    template <class... Ts>
    void Log(Verbosity level, const Ts &... args)
    {
       if (Level() < static_cast<int>(level))
          return;
       if (Hidden())
          return;
 
       std::ostringstream os;
       StreamPrefix(os);
       StreamArgs(os, args...);
       Impl(level, os.str());
    }
 
    static void StreamPrefix(std::ostringstream &os);
 
    // returns true if filters are installed and message is not selected by any filter
    static bool Hidden();
 
    // see MnPrintImpl.cxx
    static void Impl(Verbosity level, const std::string &s);
 
    // TMP to handle lambda argument correctly, exploiting overload resolution rules
    template <class T>
    static auto HandleLambda(std::ostream &os, const T &t, int) -> decltype(t(os), void())
    {
       t(os);
    }
 
    template <class T>
    static void HandleLambda(std::ostream &os, const T &t, float)
    {
       os << t;
    }
 
    static void StreamArgs(std::ostringstream &) {}
 
    // end of recursion
    template <class T>
    static void StreamArgs(std::ostringstream &os, const T &t)
    {
       os << " ";
       HandleLambda(os, t, 0);
    }
 
    template <class T, class... Ts>
    static void StreamArgs(std::ostringstream &os, const T &t, const Ts &... ts)
    {
       os << " " << t;
       StreamArgs(os, ts...);
    }
 
    int fLevel;
 };
 
 } // namespace Minuit2
 } // namespace ROOT
 
 #endif // ROOT_Minuit2_MnPrint

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