// UtilityConfig.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 UtilityConfighpp_included
#define UtilityConfighpp_included

#include "SNFMulti.hpp"

#include <string>

/// Base class for the Sniffer configuration.
//
// This class provides capability common to the configuration applications.
//
//////////////////////////////////////////////////////////////////////////////////////////////////////////
class UtilityConfig {

public:

    /// Default constructor.
    UtilityConfig();

    /// Check whether a file exists.
    //
    // \returns true if the file exists, false otherwise.
    //
    bool FileExists(std::string File);


    /// Load the specified or default config file.
    //
    // This function loads (or reloads) the config file specified in
    // the most recent call to LoadConfigFile.  If LoadConfigFile has
    // not been called, then this method searches for a unique default
    // config file in the specified list, and loads that config file.
    //
    // \param[in] DefaultFile is the list of default locations of the file.
    //
    // \param[in] NumDefaultFiles is the number of defaultlocations.
    //
    // If the local data member ConfigFile has a value of "" on input,
    // then this function checks for the existence (but not
    // readability) of a configuration file in several locations.  If
    // exactly one file exists, then that file is loaded and
    // ConfigFile is set to that name.  Otherwise, an exception is
    // thrown.
    //
    void CheckAndLoadConfigFile(const std::string DefaultFile[], int NumDefaultFiles);

    /// Load the specified configuration file.
    //
    // \param[in] Name is the name of the configuration file.
    //
    void LoadConfigFile(std::string Name);

    /// Set the configuration file name.
    //
    // \param[in] Name is the name of the configuration file.
    //
    void SetConfigFileName(std::string Name);

    /// Get the configuration file name.
    //
    // \returns the name of the configuration file.
    //
    std::string GetConfigFileName(void);

    /// Get the contents of the <platform> element of the loaded
    /// config file.
    //
    // \returns the contents of the <platform> element.
    //
    string GetPlatformContents(void);

    /// Get the workspace path.
    //
    // \returns the workspace path.
    std::string GetWorkspacePath(void);

    /// Get the rulebase path.
    //
    // \returns the rulebase path.
    std::string GetRulebasePath(void);

    /// Get the log path.
    //
    // \returns the log path.
    std::string GetLogPath(void);

    /// Get the identity file name.
    //
    // \returns the identity file name.
    std::string GetIdentityFileName(void);

    /// Get the rulebase script file name.
    //
    // \returns the rulebase script file name.
    std::string GetRulebaseScriptName(void);

    /// 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 UtilityConfig.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);

    /// Create a backup link of the specified file.
    //
    // This method creates a backup of the specified file by creating
    // a link to the file.  The name of the link is the name of the
    // file appended by the BackupSuffix data member.
    //
    // The file can be restored from the backup link by
    // RestoreFromBackupLink.
    //
    // \param[in] File is the file name to create a backup link for.
    //
    // \throws std::runtime_error in case of error.
    //
    // \see RestoreFromBackupLink.
    //
    void CreateBackupLink(std::string File);

    /// Remove the backup link of the specified file.
    //
    // This method removes the backup link of the specified file by
    // creating a link to the file.  The name of the link is the name
    // of the file appended by the BackupSuffix data member.
    //
    // \param[in] File is the file name whose backup link is to be
    // removed.
    //
    void RemoveBackupLink(std::string File);


    /// Restore the specified file from the backup link.
    //
    // This method restores the specified from the backup link created
    // by CreateBackupLink().
    //
    // \param[in] File is the file name whose backup link is to be
    // removed.
    //
    // \see CreateBackupLink.
    //
    void RestoreFromBackupLink(std::string File);

    /// Restart the MTA.
    //
    // This function starts or restarts the MTA.
    //
    // \param[in] Mta specifies the MTA.  The acceptable values are
    // "postfix" and "sendmail".
    //
    void StartOrRestartMta(std::string Mta);

    /// 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);

    /// Operating system specification.
    enum OperatingSystemSpecEnum {
	OpenBSD, ///< OpenBSD OS.
	FreeBSD, ///< FreeBSD OS.
	Ubuntu, ///< Ubuntu and variants.
	RedHat, ///< RedHat and variants.
	Suse ///< Suse and variants.
    };

    /// Load the operating-system-dependent info (file locations, etc).
    //
    // This method updates the public members that contain the OS
    // specification and file paths.
    //
    void LoadInfo();

    /// OS specification.
    OperatingSystemSpecEnum OsSpec;

    /// Postfix main.cf file path.
    std::string PostfixMainCfPath;

    /// Postfix main.cf file path.
    std::string PostfixMasterCfPath;

    /// Create or update the ignore list file.
    //
    // The ignore list file is created if it dosn't exist.  In any
    // case, the owner/group is changed by SetOwnerGroup(), and the
    // permissions are changed to readonly for everyone, and
    // read/write for the owner.
    void UpdateIgnoreListFile();

    /// Create or update the log directory.
    //
    // The log directory is created if it dosn't exist.  In any case,
    // the owner/group is changed by SetOwnerGroup(), and the
    // permissions are changed to r-x for everyone, and rwx for the
    // owner.
    void UpdateLogDir();

    /// Process one command-line item.
    //
    // \param[in] OneInput is the command-line item to process.
    //
    bool ProcessCommandLineItem(std::string OneInput);

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

    /// 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();

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

    /// Output the legal command-line input.
    std::string HelpCommandLine();

    /// Output the description of the legal command-line input.
    std::string HelpDescription();

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

private:

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

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

    bool HelpRequested; ///< User requested help.

    std::string ConfigFile; ///< Configuration file name.
    static const std::string SampleIgnoreListFile; ///< Sample ignore list file.
    static const std::string SampleRulebaseScriptFile; ///< Sample rulebase script file.

    static const std::string BackupSuffix; ///< Suffix appended to create backup file name.

    snfCFGData CFGData; ///< Configuration data.

    /// Operating system type.
    //
    // This is either Windows or the value specified for
    // --enable-os-type when configuring for *nix.
    static const std::string OperatingSystemType;
};

#endif