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-module(rec_api).
-export([t1/0, t2/0, t3/0, adt_t1/0, adt_t1/1, adt_r1/0,
t/1, t_adt/0, r/0, r_adt/0, u1/0, u2/0, u3/0, v1/0, v2/0, v3/0]).
-export_type([{a,0},{r1,0}, r2/0, r3/0]).
-export_type([f/0, op_t/0, r/0, tup/0]).
-opaque a() :: a | b.
-record(r1,
{f1 :: a()}).
-opaque r1() :: #r1{}.
t1() ->
A = #r1{f1 = a},
{r1, a} = A.
t2() ->
A = {r1, 10},
{r1, 10} = A,
A = #r1{f1 = 10}, % violates the type of field f1
#r1{f1 = 10} = A.
t3() ->
A = {r1, 10},
#r1{f1 = 10} = A. % violates the type of #r1{}
adt_t1() ->
R = rec_adt:r1(),
{r1, a} = R. % breaks the opacity
-spec adt_t1(rec_adt:r1()) -> rec_adt:r1(). % invalid type spec
adt_t1(R) ->
{r1, a} = R.
-spec adt_r1() -> rec_adt:r1(). % invalid type spec
adt_r1() ->
#r1{f1 = a}.
-opaque f() :: fun((_) -> _).
-opaque op_t() :: integer().
-spec t(f()) -> _.
t(A) ->
T = term(),
%% 3(T), % cannot test this: dialyzer_dep deliberately crashes
A(T).
-spec term() -> op_t().
term() ->
3.
t_adt() ->
A = rec_adt:f(),
T = term(),
A(T).
-record(r, {f = fun(_) -> 3 end :: f(), o = 1 :: op_t()}).
-opaque r() :: #r{}.
-opaque tup() :: {'r', f(), op_t()}.
-spec r() -> _.
r() ->
{{r, f(), 2},
#r{f = f(), o = 2}}. % OK, f() is a local opaque type
-spec f() -> f().
f() ->
fun(_) -> 3 end.
r_adt() ->
{{r, rec_adt:f(), 2},
#r{f = rec_adt:f(), o = 2}}. % breaks the opacity
-record(r2, % like #r1{}, but with initial value
{f1 = a :: a()}).
-opaque r2() :: #r2{}.
u1() ->
A = #r2{f1 = a},
{r2, a} = A.
u2() ->
A = {r2, 10},
{r2, 10} = A,
A = #r2{f1 = 10}, % violates the type of field f1
#r2{f1 = 10} = A.
u3() ->
A = {r2, 10},
#r2{f1 = 10} = A. % violates the type of #r2{}
-record(r3, % like #r1{}, but an opaque type
{f1 = queue:new():: queue:queue()}).
-opaque r3() :: #r3{}.
v1() ->
A = #r3{f1 = queue:new()},
{r3, a} = A. % breaks the opacity
v2() ->
A = {r3, 10},
{r3, 10} = A,
A = #r3{f1 = 10}, % violates the type of field f1
#r3{f1 = 10} = A.
v3() ->
A = {r3, 10},
#r3{f1 = 10} = A. % breaks the opacity
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