/////////////////////////////////////////////////////////////////////////////
// Name:        stdpaths.h
// Purpose:     interface of wxStandardPaths
// Author:      wxWidgets team
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxStandardPaths

    wxStandardPaths returns the standard locations in the file system and should be
    used by applications to find their data files in a portable way.

    Note that you must not create objects of class wxStandardPaths directly,
    but use the global standard paths object returned by wxStandardPaths::Get()
    (which can be of a type derived from wxStandardPaths and not of exactly
    this type) and call the methods you need on it. The object returned by
    Get() may be customized by overriding wxAppTraits::GetStandardPaths()
    methods.

    In the description of the methods below, the example return values are given
    for the Unix, Windows and macOS systems, however please note that these are
    just the examples and the actual values may differ. For example, under Windows:
    the system administrator may change the standard directories locations, e.g.
    the Windows directory may be named @c "W:\Win2003" instead of
    the default @c "C:\Windows".

    Notice that in the examples below the string @c appinfo may be either just
    the application name (as returned by wxApp::GetAppName()) or a combination
    of the vendor name (wxApp::GetVendorName()) and the application name, with
    a path separator between them. By default, only the application name is
    used, use UseAppInfo() to change this.

    The other placeholders should be self-explanatory: the string @c username
    should be replaced with the value the name of the currently logged in user.
    and @c prefix is only used under Unix and is @c /usr/local by default but
    may be changed using wxStandardPaths::SetInstallPrefix().

    The directories returned by the methods of this class may or may not exist.
    If they don't exist, it's up to the caller to create them, wxStandardPaths doesn't
    do it.

    Finally note that these functions only work with standardly packaged
    applications. I.e. under Unix you should follow the standard installation
    conventions and under Mac you should create your application bundle according
    to the Apple guidelines. Again, this class doesn't help you to do it.

    This class is MT-safe: its methods may be called concurrently from different
    threads without additional locking.

    @library{wxbase}
    @category{file}

    @see wxFileConfig
*/
class wxStandardPaths
{
public:
    /// Possible values for category parameter of GetLocalizedResourcesDir().
    enum ResourceCat
    {
        /// No special category, this is the default.
        ResourceCat_None,

        /// Message catalog resources category.
        ResourceCat_Messages
    };

    /// Possible values for userDir parameter of GetUserDir().
    enum Dir
    {
        /**
            Directory for caching files.

            Example return values:
            - Unix: @c ~/.cache
            - Windows: @c "C:\Users\username\AppData\Local"
            - Mac: @c ~/Library/Caches
        */
        Dir_Cache,

        /**
            Directory containing configuration information.

            Example return values:
            - Unix: `~/.config`
            - Windows: `C:\Users\username\AppData\Roaming`
            - Mac: @c `~/Library/Preferences`

            @since 3.3.0
        */
        Dir_Config,

        /**
            Directory containing user documents.

            Example return values:
            - Unix/Mac: @c ~/Documents
            - Windows: @c "C:\Users\username\Documents"
        */
        Dir_Documents,

        /**
            Directory containing files on the users desktop.

            Example return values:
            - Unix/Mac: @c ~/Desktop
            - Windows: @c "C:\Users\username\Desktop"
        */
        Dir_Desktop,

        /**
            Directory for downloaded files

            Example return values:
            - Unix/Mac: @c ~/Downloads
            - Windows: @c "C:\Users\username\Downloads"
        */
        Dir_Downloads,

        /**
            Directory containing music files.

            Example return values:
            - Unix/Mac: @c ~/Music
            - Windows: @c "C:\Users\username\Music"
        */
        Dir_Music,

        /**
            Directory containing picture files.

            Example return values:
            - Unix/Mac: @c ~/Pictures
            - Windows: @c "C:\Users\username\Pictures"
        */
        Dir_Pictures,

        /**
            Directory containing video files.

            Example return values:
            - Unix: @c ~/Videos
            - Windows: @c "C:\Users\username\Videos"
            - Mac: @c ~/Movies
        */
        Dir_Videos
    };

    /**
        Possible values for SetFileLayout() argument.

        The elements of this enum correspond to the different file layout
        standards under Unix systems.

        @since 3.1.1
     */
    enum FileLayout
    {
        /**
            Use the classic file layout.

            User configuration and data files are located directly in the home
            directory.

            This is the default behaviour for compatibility reasons.
        */
        FileLayout_Classic,

        /**
            Use a XDG styled file layout.

            File layout follows the XDG Base Directory Specification (see
            https://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html).

            This is the recommended layout for new applications.
        */
        FileLayout_XDG
    };

    /**
        Possible values for MakeConfigFileName() naming convention argument.

        The values in this enum are only used under Unix and only when using
        the classic Unix convention for file layout, in XDG mode, XDG naming
        convention is used unconditionally.

        @since 3.1.1
     */
    enum ConfigFileConv
    {
        /**
            Use the class Unix dot-file convention.

            Prepend the dot to the file base name.

            This value is ignored when in XDG mode, where MakeConfigFileName()
            always behaves as if ConfigFileConv_Ext was specified.
        */
        ConfigFileConv_Dot,

        /**
            Use @c .conf extension for the file names.

            This convention is always used in XDG mode.
         */
        ConfigFileConv_Ext
    };

    /**
        Append application and/or vendor name to the given directory.

        By default, appends the subdirectory with the application name, as
        returned by wxApp::GetAppName(), to the given directory.

        This behaviour is affected by UseAppInfo(), e.g. if this function is
        called with `AppInfo_VendorName` then the vendor name would be appended
        instead of the application name.

        @since 3.3.0
    */
    wxString AppendAppInfo(const wxString& dir) const;

    /**
        MSW-specific function undoing the effect of IgnoreAppSubDir() calls.

        After a call to this function the program directory will be exactly the
        directory containing the main application binary, i.e. it undoes the
        effect of any previous IgnoreAppSubDir() calls including the ones done
        indirectly by IgnoreAppBuildSubDirs() called from the class
        constructor.

        @since 2.9.1
     */
    void DontIgnoreAppSubDir();

    /**
        Returns reference to the unique global standard paths object.
    */
    static wxStandardPaths& Get();

    /**
        Return the directory for the document files used by this application.

        If the application-specific directory doesn't exist, this function
        returns GetDocumentsDir().

        Example return values:
        - Unix: @c ~/appinfo
        - Windows: @c "C:\Users\username\Documents\appinfo" or
                   @c "C:\Documents and Settings\username\My Documents\appinfo"
        - Mac: @c ~/Documents/appinfo

        @since 2.9.0
     */
    virtual wxString GetAppDocumentsDir() const;

    /**
        Return the directory containing the system config files.
        Example return values:
        - Unix: @c /etc
        - Windows: @c "C:\ProgramData\appinfo" or
                   @c "C:\Documents and Settings\All Users\Application Data\appinfo"
        - Mac: @c /Library/Preferences

        @note Under Windows this includes @c appinfo which makes it inconsistent
        with other ports.

        @see wxFileConfig
    */
    virtual wxString GetConfigDir() const;

    /**
        Return the location of the applications global, i.e.\ not user-specific,
        data files.

        Example return values:
        - Unix: @c prefix/share/appinfo
        - Windows: the directory where the executable file is located
        - Mac: @c appinfo.app/Contents/SharedSupport bundle subdirectory

        Note that it is possible to override the default value returned
        from this function by setting the value of @c WX_APPNAME_DATA_DIR
        environment variable to the directory to use (where @c APPNAME is the
        upper-cased value of wxApp::GetAppName()). This is useful in order to
        be able to run applications using this function without installing them
        as you can simply set this environment variable to the source directory
        location to allow the application to find its files there.

        @see GetLocalDataDir()
    */
    virtual wxString GetDataDir() const;

    /**
        Same as calling GetUserDir() with Dir_Documents parameter.

        @since 2.7.0

        @see GetAppDocumentsDir(), GetUserDir()
    */
    virtual wxString GetDocumentsDir() const;

    /**
        Return the directory and the filename for the current executable.
        Example return values:
        - Unix: @c /usr/local/bin/exename
        - Windows: @c "C:\Programs\AppFolder\exename.exe"
        - Mac: @c /Applications/exename.app/Contents/MacOS/exename
    */
    virtual wxString GetExecutablePath() const;

    /**
        Return the program installation prefix, e.g.\ @c /usr, @c /opt or @c /home/zeitlin.

        If the prefix had been previously set by SetInstallPrefix(), returns that
        value, otherwise tries to determine it automatically (Linux only right now)
        and finally returns the default @c /usr/local value if it failed.

        @note This function is only available under Unix platforms (but not limited
        to wxGTK mentioned below).

        @onlyfor{wxgtk}
    */
    wxString GetInstallPrefix() const;

    /**
        Return the location for application data files which are host-specific and
        can't, or shouldn't, be shared with the other machines.

        This is the same as GetDataDir() except under Unix where it returns @c /etc/appinfo.
    */
    virtual wxString GetLocalDataDir() const;

    /**
        Return the localized resources directory containing the resource files of the
        specified category for the given language.

        In general this is just the same as @a lang subdirectory of GetResourcesDir()
        (or @c lang.lproj under macOS) but is something quite different for
        message catalog category under Unix where it returns the standard
        @c prefix/share/locale/lang/LC_MESSAGES directory.

        @since 2.7.0
    */
    virtual wxString
    GetLocalizedResourcesDir(const wxString& lang,
                             ResourceCat category = ResourceCat_None) const;

    /**
        Return the directory where the loadable modules (plugins) live.
        Example return values:
        - Unix: @c prefix/lib/appinfo
        - Windows: the directory of the executable file
        - Mac: @c appinfo.app/Contents/PlugIns bundle subdirectory

        @see wxDynamicLibrary
    */
    virtual wxString GetPluginsDir() const;

    /**
        Return the directory where the application resource files are located.

        The resources are the auxiliary data files needed for the application to run
        and include, for example, image and sound files it might use.

        This function is the same as GetDataDir() for all platforms except macOS.
        Example return values:
        - Unix: @c prefix/share/appinfo
        - Windows: the directory where the executable file is located
        - Mac: @c appinfo.app/Contents/Resources bundle subdirectory
        - iOS: @c appinfo.app bundle subdirectory

        @since 2.7.0

        @see GetLocalizedResourcesDir()
    */
    virtual wxString GetResourcesDir() const;

    /**
        Return the directory for storing temporary files, for the current user. Same as
        wxFileName::GetTempDir().
        To create unique temporary files, it is best to use wxFileName::CreateTempFileName()
        for correct behaviour when multiple processes are attempting to create temporary files.

        @since 2.7.2
    */
    virtual wxString GetTempDir() const;

    /**
        Return the directory for the user config files.

        This directory is:
        - Unix: @c ~ (the home directory) or @c XDG_CONFIG_HOME depending on
            GetFileLayout() return value
        - Windows: @c "C:\Users\username\AppData\Roaming" or
                   @c "C:\Documents and Settings\username\Application Data"
        - Mac: @c ~/Library/Preferences

        Only use this method if you have a single configuration file to put in this
        directory, otherwise calling AppendAppInfo() with the value returned by
        GetDir() with wxStandardPaths::Dir_Config is more appropriate.
    */
    virtual wxString GetUserConfigDir() const;

    /**
        Return the directory for the user-dependent application data files.

        The returned path is:

        - Unix: @c ~/.appinfo
        - Windows: @c "C:\Users\username\AppData\Roaming\appinfo" or
                   @c "C:\Documents and Settings\username\Application Data\appinfo"
        - Mac: @c "~/Library/Application Support/appinfo"

        Please note that under Unix this function return value doesn't depend
        on the file layout, and so returns a possibly unexpected value when
        wxStandardPaths::FileLayout_XDG is used. Consider using GetUserDir()
        instead if you use XDG layout, as this function does respect it.
    */
    virtual wxString GetUserDataDir() const;

    /**
        Return the path of the specified user data directory.

        If the value could not be determined the users home directory is returned.

        @note On Unix this (newer) method always respects the XDG base
        directory specification, even if SetFileLayout() with @c FileLayout_XDG
        hadn't been called.

        @since 3.1.0
    */
    virtual wxString GetUserDir(Dir userDir) const;

    /**
        Return the directory for user data files which shouldn't be shared with
        the other machines.

        This is the same as GetUserDataDir() for all platforms except Windows where it returns
        @c "C:\Users\username\AppData\Local\appinfo" or
        @c "C:\Documents and Settings\username\Local Settings\Application Data\appinfo"
    */
    virtual wxString GetUserLocalDataDir() const;

    /**
        Return OS specific directory where project shared libraries are.

        The function does the same thing as GetPluginsDir() under non-Mac platforms
        but differs from it under Mac, where plugins (shared libraries loaded by the
        application dynamically while it's running) and shared libraries (that the
        application is statically linked with) are stored in different directories.

        - Windows: returns the folder where the application binary is located
        - Unix:    returns the libraries installation path, i.e. /usr/lib
        - Mac:     returns `Contents/Frameworks` bundle subdirectory

        @since 3.3.0
    */
    virtual wxString GetSharedLibrariesDir() const;

    /**
        MSW-specific function to customize application directory detection.

        This class supposes that data, plugins &c files are located under the
        program directory which is the directory containing the application
        binary itself. But sometimes this binary may be in a subdirectory of
        the main program directory, e.g. this happens in at least the following
        common cases:
         - The program is in "bin" subdirectory of the installation directory.
         - The program is in "debug" subdirectory of the directory containing
           sources and data files during development

        By calling this function you instruct the class to remove the last
        component of the path if it matches its argument. Notice that it may be
        called more than once, e.g. you can call both IgnoreAppSubDir("bin") and
        IgnoreAppSubDir("debug") to take care of both production and development
        cases above but that each call will only remove the last path component.
        Finally note that the argument can contain wild cards so you can also
        call IgnoreAppSubDir("vc*msw*") to ignore all build directories at once
        when using wxWidgets-inspired output directories names.

        @since 2.9.1

        @see IgnoreAppBuildSubDirs()

        @param subdirPattern
            The subdirectory containing the application binary which should be
            ignored when determining the top application directory. The pattern
            is case-insensitive and may contain wild card characters @c '?' and
            @c '*'.
     */
    void IgnoreAppSubDir(const wxString& subdirPattern);

    /**
        MSW-specific function to ignore all common build directories.

        This function calls IgnoreAppSubDir() with all common values for build
        directory, e.g. @c "debug" and @c "release".

        It is called by the class constructor and so the build directories are
        always ignored by default. You may use DontIgnoreAppSubDir() to avoid
        ignoring them if this is inappropriate for your application.

        @since 2.9.1
     */
    void IgnoreAppBuildSubDirs();

    /**
        Returns location of Windows shell special folder.

        This function is, by definition, MSW-specific. It can be used to access
        pre-defined shell directories not covered by the existing methods of
        this class, e.g.:
        @code
        #ifdef __WXMSW__
            // get the location of files waiting to be burned on a CD
            wxString cdburnArea =
                wxStandardPaths::MSWGetShellDir(CSIDL_CDBURN_AREA);
        #endif // __WXMSW__
        @endcode

        @param csidl

        @since 2.9.1
     */
    static wxString MSWGetShellDir(int csidl);

    /**
        Lets wxStandardPaths know about the real program installation prefix on a Unix
        system. By default, the value returned by GetInstallPrefix() is used.

        Although under Linux systems the program prefix may usually be determined
        automatically, portable programs should call this function. Usually the prefix
        is set during program configuration if using GNU autotools and so it is enough
        to pass its value defined in @c config.h to this function.

        @note This function is only available under Unix platforms (but not limited
        to wxGTK mentioned below).

        @onlyfor{wxgtk}
    */
    void SetInstallPrefix(const wxString& prefix);

    /**
        Controls what application information is used when constructing paths that
        should be unique to this program, such as the application data directory, the
        plugins directory on Unix, etc.

        Valid values for @a info are:
            - `AppInfo_None`: use neither application nor vendor name in
            the paths.
            - `AppInfo_AppName`: use the application name in the paths.
            - `AppInfo_VendorName`: use the vendor name in the paths, usually
            used combined with `AppInfo_AppName`, i.e. as
            `AppInfo_AppName | AppInfo_VendorName`.

        By default, only the application name is used.

        @see AppendAppInfo()

        @since 2.9.0
    */
    void UseAppInfo(int info);

    /**
        Sets the current file layout.

        The default layout is @c FileLayout_Classic for compatibility, however
        newer applications are encouraged to set it to @c FileLayout_XDG on
        program startup.

        @since 3.1.1
    */
    void SetFileLayout(FileLayout layout);

    /**
        Returns the current file layout.

        @see SetFileLayout()

        @since 3.1.1
    */
    FileLayout GetFileLayout() const;

    /**
        Return the file name which would be used by wxFileConfig if it were
        constructed with @a basename.

        @a conv is used to construct the name of the file under Unix and only
        matters when using the class file layout, i.e. if SetFileLayout() had
        @e not been called with @c FileLayout_XDG argument. In this case, this
        argument is used to determine whether to use an extension or a leading
        dot. When following XDG specification, the function always appends the
        extension, regardless of @a conv value. Finally, this argument is not
        used at all under non-Unix platforms.

        @since 3.1.1
    */
    virtual wxString
    MakeConfigFileName(const wxString& basename,
                       ConfigFileConv conv = ConfigFileConv_Ext) const;

protected:
    /**
        Protected default constructor.

        This constructor is protected in order to prevent creation of objects
        of this class as Get() should be used instead to access the unique
        global wxStandardPaths object of the correct type.
     */
    wxStandardPaths();
};

