%%--------------------------------------------------------------------
%% Copyright (c) 2020 EMQ Technologies Co., Ltd. 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.
%%--------------------------------------------------------------------

-module(emqx_os_mon_SUITE).

-compile(export_all).
-compile(nowarn_export_all).

-include_lib("eunit/include/eunit.hrl").

all() -> emqx_ct:all(?MODULE).

init_per_suite(Config) ->
    application:ensure_all_started(os_mon),
    Config.

end_per_suite(_Config) ->
    application:stop(os_mon).

% t_set_mem_check_interval(_) ->
%     error('TODO').

% t_set_sysmem_high_watermark(_) ->
%     error('TODO').

% t_set_procmem_high_watermark(_) ->
%     error('TODO').

t_api(_) ->
    gen_event:swap_handler(alarm_handler, {emqx_alarm_handler, swap}, {alarm_handler, []}),
    {ok, _} = emqx_os_mon:start_link([{cpu_check_interval, 1},
                                      {cpu_high_watermark, 0.05},
                                      {cpu_low_watermark, 0.80},
                                      {mem_check_interval, 60},
                                      {sysmem_high_watermark, 0.70},
                                      {procmem_high_watermark, 0.05}]),
    ?assertEqual(1, emqx_os_mon:get_cpu_check_interval()),
    ?assertEqual(0.05, emqx_os_mon:get_cpu_high_watermark()),
    ?assertEqual(0.80, emqx_os_mon:get_cpu_low_watermark()),
    ?assertEqual(60, emqx_os_mon:get_mem_check_interval()),
    ?assertEqual(0.7, emqx_os_mon:get_sysmem_high_watermark()),
    ?assertEqual(0.05, emqx_os_mon:get_procmem_high_watermark()),
    % timer:sleep(2000),
    % ?assertEqual(true, lists:keymember(cpu_high_watermark, 1, alarm_handler:get_alarms())),

    emqx_os_mon:set_cpu_check_interval(0.05),
    emqx_os_mon:set_cpu_high_watermark(0.8),
    emqx_os_mon:set_cpu_low_watermark(0.75),
    ?assertEqual(0.05, emqx_os_mon:get_cpu_check_interval()),
    ?assertEqual(0.8, emqx_os_mon:get_cpu_high_watermark()),
    ?assertEqual(0.75, emqx_os_mon:get_cpu_low_watermark()),
    % timer:sleep(3000),
    % ?assertEqual(false, lists:keymember(cpu_high_watermark, 1, alarm_handler:get_alarms())),
    ?assertEqual(ignored, gen_server:call(emqx_os_mon, ignored)),
    ?assertEqual(ok, gen_server:cast(emqx_os_mon, ignored)),
    emqx_os_mon ! ignored,
    gen_server:stop(emqx_os_mon),
    ok.

t_timeout(_) ->
    ok = meck:new(emqx_vm),

    ok = meck:expect(emqx_vm, cpu_util, fun() -> 0 end),
    {ok, _} = emqx_os_mon:start_link([{cpu_check_interval, 1}]),
    timer:sleep(1500),
    gen_server:stop(emqx_os_mon),

    ok = meck:expect(emqx_vm, cpu_util, fun() -> {error, test_case} end),
    {ok, _} = emqx_os_mon:start_link([{cpu_check_interval, 1}]),
    timer:sleep(1500),
    gen_server:stop(emqx_os_mon),

    ok = meck:expect(emqx_vm, cpu_util, fun() -> 90 end),
    {ok, _} = emqx_os_mon:start_link([{cpu_check_interval, 1},
                                      {cpu_high_watermark, 0.80},
                                      {cpu_low_watermark, 0.60}]),
    timer:sleep(1500),

    emqx_os_mon:set_cpu_high_watermark(1.00),
    timer:sleep(1500),

    emqx_os_mon:set_cpu_low_watermark(0.95),
    timer:sleep(1500),

    gen_server:stop(emqx_os_mon),
    ok = meck:unload(emqx_vm).