-module(admin_handler_event_stats_tests).
-include_lib("eunit/include/eunit.hrl").
-include("records.hrl").

-define(TABLES, [admin, admin_audit, calendar, event, ticket]).
-define(ADMIN_ID, <<"adm_test_1">>).
-define(OWNER_ID, <<"owner_evt_stats">>).

setup() ->
  eh_test_support:start_mnesia(),
  eh_test_support:ensure_tables(?TABLES),
  eh_test_support:ensure_jwt(),
  eh_test_support:seed_admin(#{id => ?ADMIN_ID}),
  ok.

cleanup(_) ->
  eh_test_support:unload_cowboy(),
  eh_test_support:delete_tables(?TABLES),
  eh_test_support:stop_mnesia(),
  ok.

admin_event_stats_test_() ->
  {foreach, fun setup/0, fun cleanup/1, [
    {"GET stats – empty", {timeout, 60, fun test_stats_empty/0}},
    {"GET stats – with events", {timeout, 60, fun test_stats_with_data/0}},
    {"GET – unauthorized", {timeout, 60, fun test_unauthorized/0}},
    {"POST – method not allowed", {timeout, 60, fun test_wrong_method/0}}
  ]}.

test_stats_empty() ->
  {Status, _, Body} = eh_test_support:call(admin_handler_event_stats, #{
    method => <<"GET">>,
    path => <<"/v1/admin/events/stats">>,
    auth => ?ADMIN_ID
  }),
  ?assertEqual(200, Status),
  Result = jsx:decode(Body, [return_maps]),
  ?assertEqual(0, maps:get(<<"total_events">>, Result)),
  ?assertEqual(#{}, maps:get(<<"events_by_type">>, Result)),
  ?assertEqual(#{}, maps:get(<<"events_by_status">>, Result)),
  ?assertEqual([], maps:get(<<"top_events_by_rating">>, Result)).

test_stats_with_data() ->
  {ok, Cal} = core_calendar:create(?OWNER_ID, <<"Cal">>, <<"">>, auto),
  CalId = Cal#calendar.id,
  Start = eh_test_support:future_start(),
  {ok, E1} = core_event:create(CalId, <<"Rated">>, Start, 60),
  {ok, _} = core_event:create(CalId, <<"Other">>, Start, 30),
  {ok, _} = core_event:update(E1#event.id, [
    {rating_avg, 4.8},
    {rating_count, 5}
  ]),
  {Status, _, Body} = eh_test_support:call(admin_handler_event_stats, #{
    method => <<"GET">>,
    path => <<"/v1/admin/events/stats">>,
    auth => ?ADMIN_ID
  }),
  ?assertEqual(200, Status),
  Result = jsx:decode(Body, [return_maps]),
  ?assertEqual(2, maps:get(<<"total_events">>, Result)),
  ByType = maps:get(<<"events_by_type">>, Result),
  ?assertEqual(2, maps:get(<<"single">>, ByType)),
  ByStatus = maps:get(<<"events_by_status">>, Result),
  ?assertEqual(2, maps:get(<<"active">>, ByStatus)),
  Top = maps:get(<<"top_events_by_rating">>, Result),
  ?assert(length(Top) >= 1),
  [First | _] = Top,
  ?assertEqual(E1#event.id, maps:get(<<"id">>, First)).

test_unauthorized() ->
  {Status, _, _} = eh_test_support:call(admin_handler_event_stats, #{
    method => <<"GET">>,
    path => <<"/v1/admin/events/stats">>,
    auth => none
  }),
  ?assertEqual(401, Status).

test_wrong_method() ->
  {Status, _, _} = eh_test_support:call(admin_handler_event_stats, #{
    method => <<"POST">>,
    path => <<"/v1/admin/events/stats">>,
    auth => ?ADMIN_ID
  }),
  ?assertEqual(405, Status).