%%--------------------------------------------------------------------
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2018. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%----------------------------------------------------------------------
%% File    : ct_config_plain.erl
%% Description : CT callback module for reading configs from text files
%%
%% Created : 15 February 2010
%%----------------------------------------------------------------------
-module(ct_config_plain).
-export([read_config/1, check_parameter/1]).

read_config(ConfigFile) ->
    case file:consult(ConfigFile) of
	{ok,Config} ->
	    {ok, Config};
	{error,enoent} ->
	    {error,{config_file_error,file:format_error(enoent)}};
	{error,Reason} ->
	    Key =
		case application:get_env(common_test, decrypt) of
		    {ok,KeyOrFile} ->
			case KeyOrFile of
			    {key,K} ->
				K;
			    {file,F} ->
				ct_config:get_crypt_key_from_file(F)
			end;
		    _ ->
			ct_config:get_crypt_key_from_file()
		end,
	    case Key of
		{error,no_crypt_file} ->
		    {error,{config_file_error,
			    lists:flatten(
			      io_lib:format("~ts",[file:format_error(Reason)]))}};
		{error,CryptError} ->
		    {error,{decrypt_file_error,CryptError}};
		_ when is_list(Key) ->
		    case ct_config:decrypt_config_file(ConfigFile,
						       undefined,
						       {key,Key}) of
			{ok,CfgBin} ->
			    case read_config_terms(CfgBin) of
				{error,ReadFail} ->
				    {error,{config_file_error,ReadFail}};
				Config ->
				    {ok,Config}
			    end;
			{error,DecryptFail} ->
			    {error,{decrypt_config_error,DecryptFail}}
		    end;
		_ ->
		    {error,{bad_decrypt_key,Key}}
	    end
    end.

% check if config file exists
check_parameter(File)->
    case filelib:is_file(File) of
	true->
	    {ok,{file,File}};
	false->
	    {error,{nofile,File}}
    end.

read_config_terms(Bin) when is_binary(Bin) ->
    case catch binary_to_list(Bin) of
	{'EXIT',_} ->
	    {error,invalid_textfile};
	Lines ->
	    read_config_terms(Lines)
    end;
read_config_terms(Lines) when is_list(Lines) ->
    read_config_terms1(erl_scan:tokens([], Lines, 0), 1, [], []).

read_config_terms1({done,{ok,Ts,EL},Rest}, L, Terms, _) ->
    case erl_parse:parse_term(Ts) of
	{ok,Term} when Rest == [] ->
	    lists:reverse([Term|Terms]);
	{ok,Term} ->
	    read_config_terms1(erl_scan:tokens([], Rest, 0),
			       EL+1, [Term|Terms], Rest);
	_ ->
	    {error,{bad_term,{L,EL}}}
    end;
read_config_terms1({done,{eof,_},_}, _, Terms, Rest) when Rest == [] ->
    lists:reverse(Terms);
read_config_terms1({done,{eof,EL},_}, L, _, _) ->
    {error,{bad_term,{L,EL}}};
read_config_terms1({done,{error,Info,EL},_}, L, _, _) ->
    {error,{Info,{L,EL}}};
read_config_terms1({more,_}, L, Terms, Rest) ->
    case string:lexemes(Rest, [$\n,[$\r,$\n],$\t]) of
	[] ->
	    lists:reverse(Terms);
	_ ->
	    {error,{bad_term,L}}
    end.