%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1996-2010. All Rights Reserved.
%% 
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%%
-module(log_mf_h_SUITE).

-include_lib("test_server/include/test_server.hrl").
-include_lib("kernel/include/file.hrl").

-export([all/0,groups/0,init_per_group/2,end_per_group/2, test/1]).

all() -> 
[test].

groups() -> 
    [].

init_per_group(_GroupName, Config) ->
	Config.

end_per_group(_GroupName, Config) ->
	Config.



%%-----------------------------------------------------------------
%% This is actually very basic tests, maybe we could test some more
%% in the future...
%%-----------------------------------------------------------------

test(Config) when is_list(Config) ->
    ?line {ok, Pid} = gen_event:start_link(),
    ?line PrivDir = ?config(priv_dir, Config),
    Log1 = PrivDir ++ "/log1",
    ?line ok = file:make_dir(Log1),
    Args1 = log_mf_h:init(Log1, 500, 3),
    gen_event:add_handler(Pid, log_mf_h, Args1),
    generate(Pid, 200),
    {ok, Files} = file:list_dir(Log1),
    ?line true = lists:member("1", Files),
    ?line true = lists:member("index", Files),
    ?line false = lists:member("2", Files),
    generate(Pid, 2500),
    %% The documentation doesn't guarantee that syncing one request
    %% causes all previous ones to be finished too, but that seems to
    %% be the case. We need to be sure that the files exist when we
    %% look for them with 'list_dir'.
    gen_event:sync_notify(Pid, "end"),
    {ok, Files2} = file:list_dir(Log1),
    ?line true = lists:member("1", Files2),
    ?line true = lists:member("2", Files2),
    ?line true = lists:member("3", Files2),
    ?line false = lists:member("4", Files2),
    ?line true = lists:member("index", Files2),
    ?line {ok, #file_info{size=Size1,type=regular}} = file:read_file_info(Log1 ++ "/1"),
    ?line if Size1 > 500 -> test_server:fail({too_big, Size1});
	     true -> ok end,
    ?line {ok, #file_info{size=Size2,type=regular}} = file:read_file_info(Log1 ++ "/2"),
    ?line if Size2 > 500 -> test_server:fail({too_big, Size2});
	     true -> ok end,
    ?line {ok, #file_info{size=Size3,type=regular}} = file:read_file_info(Log1 ++ "/3"),
    ?line if Size3 > 500 -> test_server:fail({too_big, Size3});
	     true -> ok end,
    gen_event:delete_handler(Pid, log_mf_h, []),
    ?line {ok, Index} = read_index_file(Log1),
    gen_event:add_handler(Pid, log_mf_h, Args1),    
    X = if Index == 3 -> 1; true -> Index + 1 end,
    ?line {ok, X} = read_index_file(Log1).
    

generate(Pid, Bytes) when Bytes > 32 ->
    gen_event:notify(Pid, make_list(32, [])),
    generate(Pid, Bytes - 32);
generate(_, _) -> ok.

make_list(0, Res) ->  Res;
make_list(N, Res) -> make_list(N-1, [67 | Res]).


read_index_file(Dir) ->
    case file:open(Dir ++ "/index", [read,raw]) of
	{ok, Fd} ->
	    case catch file:read(Fd, 1) of
		{ok, [Index]} -> {ok, Index};
		_ -> error
	    end;
	_ -> error
    end.