-- THIS FILE WAS AUTOMATICALLY GENERATED BY AENEAS
-- [external]: function definitions
import Base.Primitives
import External.Types
import External.Opaque

section variable (opaque_defs: OpaqueDefs)

/- [external::swap] -/
def swap_fwd
  (T : Type) (x : T) (y : T) (st : State) : Result (State × Unit) :=
  do
    let (st0, _) ← opaque_defs.core_mem_swap_fwd T x y st
    let (st1, _) ← opaque_defs.core_mem_swap_back0 T x y st st0
    let (st2, _) ← opaque_defs.core_mem_swap_back1 T x y st st1
    Result.ret (st2, ())

/- [external::swap] -/
def swap_back
  (T : Type) (x : T) (y : T) (st : State) (st0 : State) :
  Result (State × (T × T))
  :=
  do
    let (st1, _) ← opaque_defs.core_mem_swap_fwd T x y st
    let (st2, x0) ← opaque_defs.core_mem_swap_back0 T x y st st1
    let (_, y0) ← opaque_defs.core_mem_swap_back1 T x y st st2
    Result.ret (st0, (x0, y0))

/- [external::test_new_non_zero_u32] -/
def test_new_non_zero_u32_fwd
  (x : UInt32) (st : State) :
  Result (State × core_num_nonzero_non_zero_u32_t)
  :=
  do
    let (st0, opt) ← opaque_defs.core_num_nonzero_non_zero_u32_new_fwd x st
    opaque_defs.core_option_option_unwrap_fwd core_num_nonzero_non_zero_u32_t
      opt st0

/- [external::test_vec] -/
def test_vec_fwd : Result Unit :=
  do
    let v := vec_new UInt32
    let _ ← vec_push_back UInt32 v (UInt32.ofNatCore 0 (by intlit))
    Result.ret ()

/- Unit test for [external::test_vec] -/
#assert (test_vec_fwd == .ret ())

/- [external::custom_swap] -/
def custom_swap_fwd
  (T : Type) (x : T) (y : T) (st : State) : Result (State × T) :=
  do
    let (st0, _) ← opaque_defs.core_mem_swap_fwd T x y st
    let (st1, x0) ← opaque_defs.core_mem_swap_back0 T x y st st0
    let (st2, _) ← opaque_defs.core_mem_swap_back1 T x y st st1
    Result.ret (st2, x0)

/- [external::custom_swap] -/
def custom_swap_back
  (T : Type) (x : T) (y : T) (st : State) (ret0 : T) (st0 : State) :
  Result (State × (T × T))
  :=
  do
    let (st1, _) ← opaque_defs.core_mem_swap_fwd T x y st
    let (st2, _) ← opaque_defs.core_mem_swap_back0 T x y st st1
    let (_, y0) ← opaque_defs.core_mem_swap_back1 T x y st st2
    Result.ret (st0, (ret0, y0))

/- [external::test_custom_swap] -/
def test_custom_swap_fwd
  (x : UInt32) (y : UInt32) (st : State) : Result (State × Unit) :=
  do
    let (st0, _) ← custom_swap_fwd UInt32 x y st
    Result.ret (st0, ())

/- [external::test_custom_swap] -/
def test_custom_swap_back
  (x : UInt32) (y : UInt32) (st : State) (st0 : State) :
  Result (State × (UInt32 × UInt32))
  :=
  custom_swap_back UInt32 x y st (UInt32.ofNatCore 1 (by intlit)) st0

/- [external::test_swap_non_zero] -/
def test_swap_non_zero_fwd
  (x : UInt32) (st : State) : Result (State × UInt32) :=
  do
    let (st0, _) ← swap_fwd UInt32 x (UInt32.ofNatCore 0 (by intlit)) st
    let (st1, (x0, _)) ←
      swap_back UInt32 x (UInt32.ofNatCore 0 (by intlit)) st st0
    if h: x0 = (UInt32.ofNatCore 0 (by intlit))
    then Result.fail Error.panic
    else Result.ret (st1, x0)