//
// Message.h
//
// Library: Foundation
// Package: Logging
// Module:  Message
//
// Definition of the Message class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_Message_INCLUDED
#define Foundation_Message_INCLUDED


#include <map>
#include "Poco/Foundation.h"
#include "Poco/Timestamp.h"


namespace Poco
{


class Foundation_API Message
/// This class represents a log message that is sent through a
/// chain of log channels.
///
/// A Message contains a priority denoting the severity of the
/// message, a source describing its origin, a text describing
/// its meaning, the time of its creation, and an identifier of
/// the process and thread that created the message.
///
/// Optionally a Message can also contain the source file path
/// and line number of the statement generating the message.
///
/// A Message can also contain any number of named parameters
/// that contain additional information about the event that
/// caused the message.
{
public:
    enum Priority
    {
        PRIO_FATAL = 1, /// A fatal error. The application will most likely terminate. This is the highest priority.
        PRIO_CRITICAL, /// A critical error. The application might not be able to continue running successfully.
        PRIO_ERROR, /// An error. An operation did not complete successfully, but the application as a whole is not affected.
        PRIO_WARNING, /// A warning. An operation completed with an unexpected result.
        PRIO_NOTICE, /// A notice, which is an information with just a higher priority.
        PRIO_INFORMATION, /// An informational message, usually denoting the successful completion of an operation.
        PRIO_DEBUG, /// A debugging message.
        PRIO_TRACE, /// A tracing message. This is the lowest priority useful for production.
        PRIO_TEST /// A message for test environment.
    };

    Message();
    /// Creates an empty Message.
    /// The thread and process ids are set.

    Message(const std::string & source, const std::string & text, Priority prio);
    /// Creates a Message with the given source, text and priority.
    /// The thread and process ids are set.

    Message(
        const std::string & source, const std::string & text, Priority prio, const char * file, int line, std::string_view fmt_str = {});
    /// Creates a Message with the given source, text, priority,
    /// source file path and line.
    ///
    /// The source file path must be a
    /// static string with a lifetime that's at least the lifetime
    /// of the message object (the string is not copied internally).
    /// Usually, this will be the path string obtained from the
    /// __FILE__ macro.
    ///
    /// The thread and process ids are set.

    Message(const Message & msg);
    /// Creates a Message by copying another one.

    Message(const Message & msg, const std::string & text);
    /// Creates a Message by copying all but the text from another message.

    ~Message();
    /// Destroys the Message.

    Message & operator=(const Message & msg);
    /// Assignment operator.

    void swap(Message & msg);
    /// Swaps the message with another one.

    void setSource(const std::string & src);
    /// Sets the source of the message.

    const std::string & getSource() const;
    /// Returns the source of the message.

    void setText(const std::string & text);
    /// Sets the text of the message.

    const std::string & getText() const;
    /// Returns the text of the message.

    void appendText(const std::string & text);

    void setPriority(Priority prio);
    /// Sets the priority of the message.

    Priority getPriority() const;
    /// Returns the priority of the message.

    void setTime(const Timestamp & time);
    /// Sets the time of the message.

    const Timestamp & getTime() const;
    /// Returns the time of the message.

    void setThread(const std::string & thread);
    /// Sets the thread identifier for the message.

    const std::string & getThread() const;
    /// Returns the thread identifier for the message.

    void setTid(long pid);
    /// Sets the numeric thread identifier for the message.

    long getTid() const;
    /// Returns the numeric thread identifier for the message.

    void setPid(long pid);
    /// Sets the process identifier for the message.

    long getPid() const;
    /// Returns the process identifier for the message.

    void setSourceFile(const char * file);
    /// Sets the source file path of the statement
    /// generating the log message.
    ///
    /// File must be a static string, such as the value of
    /// the __FILE__ macro. The string is not copied
    /// internally for performance reasons.

    const char * getSourceFile() const;
    /// Returns the source file path of the code creating
    /// the message. May be 0 if not set.

    void setSourceLine(int line);
    /// Sets the source file line of the statement
    /// generating the log message.
    ///
    /// This is usually the result of the __LINE__
    /// macro.

    std::string_view getFormatString() const;
    void setFormatString(std::string_view fmt_str);

    int getSourceLine() const;
    /// Returns the source file line of the statement
    /// generating the log message. May be 0
    /// if not set.

    bool has(const std::string & param) const;
    /// Returns true if a parameter with the given name exists.

    const std::string & get(const std::string & param) const;
    /// Returns a const reference to the value of the parameter
    /// with the given name. Throws a NotFoundException if the
    /// parameter does not exist.

    const std::string & get(const std::string & param, const std::string & defaultValue) const;
    /// Returns a const reference to the value of the parameter
    /// with the given name. If the parameter with the given name
    /// does not exist, then defaultValue is returned.

    void set(const std::string & param, const std::string & value);
    /// Sets the value for a parameter. If the parameter does
    /// not exist, then it is created.

    const std::string & operator[](const std::string & param) const;
    /// Returns a const reference to the value of the parameter
    /// with the given name. Throws a NotFoundException if the
    /// parameter does not exist.

    std::string & operator[](const std::string & param);
    /// Returns a reference to the value of the parameter with the
    /// given name. This can be used to set the parameter's value.
    /// If the parameter does not exist, it is created with an
    /// empty string value.

protected:
    void init();
    typedef std::map<std::string, std::string> StringMap;

private:
    std::string _source;
    std::string _text;
    Priority _prio;
    Timestamp _time;
    long _tid;
    std::string _thread;
    mutable long _pid = -1;
    const char * _file;
    int _line;
    StringMap * _pMap;
    std::string_view _fmt_str;
};


//
// inlines
//
inline const std::string & Message::getSource() const
{
    return _source;
}


inline const std::string & Message::getText() const
{
    return _text;
}


inline Message::Priority Message::getPriority() const
{
    return _prio;
}


inline const Timestamp & Message::getTime() const
{
    return _time;
}


inline const std::string & Message::getThread() const
{
    return _thread;
}


inline long Message::getTid() const
{
    return _tid;
}


inline const char * Message::getSourceFile() const
{
    return _file;
}


inline int Message::getSourceLine() const
{
    return _line;
}


inline void swap(Message & m1, Message & m2)
{
    m1.swap(m2);
}


} // namespace Poco


#endif // Foundation_Message_INCLUDED