-module(erlsass).
-export([
    version/0
    ,compile/2    
    ,compile/3 
    ,compile_write/3   
    ,compile_write/4
    ,compile_file/2
]).
-on_load(init/0).

-include("dev.hrl").

-define(APPNAME, erlsass).
-define(LIBNAME, erlsass_nif).

version ( ) -> 
    not_loaded(?LINE).

compile ( file, File ) ->
    compile ( file, File, "compressed" ).

compile ( file, File, Style ) ->
    FullPath = filename:absname( File ),
    case filelib:is_file ( FullPath ) of
        true -> compile_file ( Style, FullPath );
        false -> {error, "File does not exsist."}
    end.

compile_write (file, File, OutputFile ) ->
    compile_write(file, File, OutputFile, "compressed").

compile_write ( file, File, OutputFile, Style ) ->
    case compile ( file, File, Style ) of 
        {ok, Output} -> file:write_file ( filename:absname ( OutputFile ), Output );
        E -> E
    end.

compile_file(_, _) ->
    not_loaded(?LINE).

init() ->
    PrivDir = case code:priv_dir(?APPNAME) of
        {error, bad_name} ->
            case filelib:is_dir(filename:join(["..", priv])) of
                true -> filename:nativename( filename:absname( filename:join(["..", priv]) ) );
                _ -> filename:nativename( filename:absname( filename:join([priv]) ) )
            end;
        Dir -> filename:nativename( filename:absname( Dir ) )
    end,    

    case os:type() of
        {win32, _Osname} -> 
            Path = os:getenv("PATH"),
            Path2 = case string:right(Path, 1) of
                ";" -> Path;
                _True -> Path ++ ";"
            end,
            os:putenv("PATH", Path2 ++ PrivDir ++ ";");
        _True -> ok
    end,    

    SharedLib = filename:join(PrivDir, ?LIBNAME),     
    erlang:load_nif(SharedLib, 0).

not_loaded(Line) ->
    exit({not_loaded, [{module, ?MODULE}, {line, Line}]}).