-module(hope_list_SUITE).

-include_lib("proper/include/proper_common.hrl").

%% Callbacks
-export(
    [ all/0
    , groups/0
    ]).

%% Test cases
-export(
    [ t_auto_hope_list_specs/1
    , t_auto_map/1
    , t_auto_map_3/1
    , t_auto_map_rev/1
    , t_auto_map_slow/1
    , t_auto_unique_preserve_order/1
    , t_manual_map/1
    , t_manual_map_result/1
    , t_manual_map_rev/1
    , t_manual_map_slow/1
    , t_manual_divide/1
    ]).


-define(GROUP , hope_list).

-define(TEST(TestSpec), true = proper:quickcheck(TestSpec)).

-define(type, proper_types).


%% ============================================================================
%% Common Test callbacks
%% ============================================================================

all() ->
    [{group, ?GROUP}].

groups() ->
    Tests =
        [ t_auto_hope_list_specs
        , t_auto_map
        , t_auto_map_3
        , t_auto_map_rev
        , t_auto_map_slow
        , t_auto_unique_preserve_order
        , t_manual_map
        , t_manual_map_result
        , t_manual_map_rev
        , t_manual_map_slow
        , t_manual_divide
        ],
    Properties = [parallel],
    [{?GROUP, Properties, Tests}].

%% =============================================================================
%%  Manual test cases
%% =============================================================================

t_manual_map(_Cfg) ->
    F = fun (N) -> N + 1 end,
    Xs = lists:seq(1, 5010),
    Ys = lists:map(F, Xs),
    Ys = hope_list:map(Xs, F),
    [] = hope_list:map([], F).

t_manual_map_result(_Cfg) ->
    AssertPositive =
        fun (I) when I > 0 -> {ok, I}; (_) -> {error, negative} end,
    AllPositives = lists:seq(1, 5),
    AllNegatives = lists:seq(-5, -1),
    Mixed = lists:seq(-5, 5),
    {ok, AllPositives} = hope_list:map_result(AllPositives, AssertPositive),
    {error, negative}  = hope_list:map_result(AllNegatives, AssertPositive),
    {error, negative}  = hope_list:map_result(Mixed, AssertPositive).

t_manual_map_rev(_Cfg) ->
    F = fun (N) -> N + 1 end,
    [4, 3, 2] = hope_list:map_rev([1, 2, 3], F),
    []        = hope_list:map_rev([], F).

t_manual_map_slow(_Cfg) ->
    F = fun (N) -> N + 1 end,
    [2, 3, 4] = hope_list:map_slow([1, 2, 3], F),
    []        = hope_list:map_slow([], F).

t_manual_divide(_Cfg) ->
    try
        hope_list:divide([a, b, c], -1)
    catch
        error:hope_list__divide__size_must_be_a_positive_integer -> ok
    end,
    try
        hope_list:divide([a, b, c], 0)
    catch
        error:hope_list__divide__size_must_be_a_positive_integer -> ok
    end,
    [[c], [b], [a]] = hope_list:divide([a, b, c], 1),
    [[c], [b, a]]   = hope_list:divide([a, b, c], 2),
    [[c, b, a]]     = hope_list:divide([a, b, c], 3),
    [[c, b, a]]     = hope_list:divide([a, b, c], 4),
    [[c, b, a]]     = hope_list:divide([a, b, c], 5),
    try
        hope_list:divide([], 0)
    catch
        error:hope_list__divide__size_must_be_a_positive_integer -> ok
    end,
    try
        hope_list:divide([], -1)
    catch
        error:hope_list__divide__size_must_be_a_positive_integer -> ok
    end,
    [[f, e], [d,   c], [b, a]] = hope_list:divide([a, b, c, d, e, f], 2),
    [[f, e,   d], [c,   b, a]] = hope_list:divide([a, b, c, d, e, f], 3).

%% =============================================================================
%%  Generated test cases
%% =============================================================================

t_auto_map_rev(_Cfg) ->
    ?TEST(?FORALL({L, F}, {type_l(), type_f()},
        hope_list:map_rev(L, F) == lists:reverse(lists:map(F, L))
    )).

t_auto_map_slow(_Cfg) ->
    ?TEST(?FORALL({L, F}, {type_l(), type_f()},
        hope_list:map_slow(L, F) == lists:map(F, L)
    )).

t_auto_map(_Cfg) ->
    ?TEST(?FORALL({L, F}, {type_l(), type_f()},
        hope_list:map(L, F) == lists:map(F, L)
    )).

t_auto_map_3(_Cfg) ->
    ?TEST(?FORALL({L, F, N}, {type_l(), type_f(), ?type:non_neg_integer()},
        hope_list:map(L, F, N) == lists:map(F, L)
    )).

t_auto_unique_preserve_order(_Cfg) ->
    ?TEST(?FORALL(L, ?type:list(),
    begin
        Duplicates = L -- lists:usort(L),
        UniquesInOrderA = lists:reverse(lists:reverse(L) -- Duplicates),
        UniquesInOrderB = hope_list:unique_preserve_order(L),
        UniquesInOrderA == UniquesInOrderB
    end)).

t_auto_hope_list_specs(_Cfg) ->
    [] = proper:check_specs(hope_list).

%% ============================================================================
%% Common types
%% ============================================================================

type_l() ->
    ?type:list(?type:integer()).

type_f() ->
    ?type:function([?type:integer()], ?type:term()).