// Utility.hpp
//
// Copyright (C) 2011 ARM Research Labs, LLC.
// See www.armresearch.com for the copyright terms.
//
// This file defines the interface used by the configuration utilities.
//

#ifndef Utilityhpp_included
#define Utilityhpp_included

#include <sys/stat.h>

#include <string>

/// Base class for the Sniffer configuration.
//
// This class provides capability common to the configuration classes.
//
//////////////////////////////////////////////////////////////////////////////////////////////////////////
class Utility {

public:

    /// Default constructor.
    Utility();

    /// Check whether a file exists.
    //
    // \param[in] File is the name of the file.
    //
    // \returns true if the file exists, false otherwise.
    //
    bool FileExists(std::string File);

    /// Read last part of a file.
    //
    // \param[in] File is the name of the file.
    //
    // \param[in] Size is the number of bytes from the end to start reading.
    //
    // \returns contents of the end of the file if the file exists, "" otherwise.
    //
    std::string ReadLastPartOfFile(std::string File, long Size);

    /// Copy a file.
    //
    // \param[in] From is the name of the source file.
    //
    // \param[in] To is the name of the destination file.
    //
    void Copy(std::string From, std::string To);

    /// Set the owner and group of the specified file.
    //
    // This function sets the owner and group of the specified file to the
    // value specified in Utility.cpp.
    //
    // \param[in] File is the specified file.
    //
    // \see SNFUserName.
    //
    // \see SNFGroupName.
    //
    void SetOwnerGroup(std::string File);

    /// Set the mode of a file.
    //
    // This function sets the mode of the specified file.  If an error
    // occurs, an exception is thrown.
    //
    // \param[in] File is the specified file.
    //
    // \param[in] is the mode.
    //
    void SetMode(std::string File, mode_t mode);

    /// Create a directory.
    //
    // This function creates the specified directory.  If an error
    // occurs, an exception is thrown.
    //
    // \param[in] Dir is the directory to create.
    //
    void MkDir(std::string &Dir);

    /// Check for a specified string at the beginning of a line.
    //
    // This function checks for the specified string at the beginning of a
    // line.  Leading whitespace in the line is ignored.
    //
    // \param[in] Line is the line.
    //
    // \param[in] SearchString is the string to check for.
    //
    static bool CheckForString(std::string Line, std::string SearchString);

    /// Replace an XML attribute.
    //
    // Replace the specified XML element attribute with the specified value.
    //
    // \param[in, out] Content is the XML content containing the element.
    //
    // \param[in] ElementName is the name of the XML element.
    //
    // \param[in] AttributeName is the name of the XML attribute.
    //
    // \param[in] AttributeValue is the new value of the XML attribute.
    //
    static void ReplaceXmlAttribute(std::string *Content, std::string ElementName, std::string AttributeName, std::string AttributeValue);

    /// Trim whitespace from a string.
    //
    // This method removes leading " ", "\t", "\r", and "\n" from the specified string.
    //
    // \param[in] String is the string to trim.
    //
    // \returns String with the leading and trailing whitespace removed.
    static std::string Trim(std::string String);

    /// Store the Debug mode.
    //
    // \param[in] Mode stores the Debug mode.
    //
    void SetDebug(bool Mode);

    /// Provide debug output?
    //
    // \returns true if the application is to provide debug output.
    //
    bool Debug();

    /// Store the Verbose mode.
    //
    // \param[in] Mode stores the Verbose mode.
    //
    void SetVerbose(bool Mode);

    /// Provide verbose output?
    //
    // \returns true if the application is to provide verbose output.
    //
    bool Verbose();

    /// Store the Explain mode.
    //
    // \param[in] Mode stores the Explain mode.
    //
    void SetExplain(bool Mode);

    /// Provide an explanation of the actions only?
    //
    // \returns true if the application is to provide an explanation
    // of the actions without executing any commands.
    //
    bool Explain();

    /// Store the Help mode.
    //
    // \param[in] Mode stores the Help mode.
    //
    void SetHelp(bool Mode);

    /// Provide help?
    //
    // \returns true if the application is to output a help message.
    //
    bool Help();

    /// Output the end of a verbose output line.
    void OutputVerboseEnd();

    /// Directory separator.
    static const std::string DirectorySeparator;

private:

    bool DebugRequested; ///< User requested debug output.

    bool VerboseRequested; ///< User requested verbose processing.

    bool ExplainRequested; ///< User requested verbose processing but without actually executing the commands.

    bool HelpRequested; ///< User requested help.

};

#endif