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

/- [external::swap]: forward function -/
def swap (T : Type) (x : T) (y : T) (st : State) : Result (State × Unit) :=
  do
    let (st0, _) ← core.mem.swap T x y st
    let (st1, _) ← core.mem.swap_back0 T x y st st0
    let (st2, _) ← core.mem.swap_back1 T x y st st1
    Result.ret (st2, ())

/- [external::swap]: backward function 0 -/
def swap_back
  (T : Type) (x : T) (y : T) (st : State) (st0 : State) :
  Result (State × (T × T))
  :=
  do
    let (st1, _) ← core.mem.swap T x y st
    let (st2, x0) ← core.mem.swap_back0 T x y st st1
    let (_, y0) ← core.mem.swap_back1 T x y st st2
    Result.ret (st0, (x0, y0))

/- [external::test_new_non_zero_u32]: forward function -/
def test_new_non_zero_u32
  (x : U32) (st : State) : Result (State × core.num.nonzero.NonZeroU32) :=
  do
    let (st0, opt) ← core.num.nonzero.NonZeroU32.new x st
    core.option.Option.unwrap core.num.nonzero.NonZeroU32 opt st0

/- [external::test_vec]: forward function -/
def test_vec : Result Unit :=
  do
    let v := Vec.new U32
    let _ ← Vec.push U32 v (U32.ofInt 0 (by intlit))
    Result.ret ()

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

/- [external::custom_swap]: forward function -/
def custom_swap
  (T : Type) (x : T) (y : T) (st : State) : Result (State × T) :=
  do
    let (st0, _) ← core.mem.swap T x y st
    let (st1, x0) ← core.mem.swap_back0 T x y st st0
    let (st2, _) ← core.mem.swap_back1 T x y st st1
    Result.ret (st2, x0)

/- [external::custom_swap]: backward function 0 -/
def custom_swap_back
  (T : Type) (x : T) (y : T) (st : State) (ret0 : T) (st0 : State) :
  Result (State × (T × T))
  :=
  do
    let (st1, _) ← core.mem.swap T x y st
    let (st2, _) ← core.mem.swap_back0 T x y st st1
    let (_, y0) ← core.mem.swap_back1 T x y st st2
    Result.ret (st0, (ret0, y0))

/- [external::test_custom_swap]: forward function -/
def test_custom_swap
  (x : U32) (y : U32) (st : State) : Result (State × Unit) :=
  do
    let (st0, _) ← custom_swap U32 x y st
    Result.ret (st0, ())

/- [external::test_custom_swap]: backward function 0 -/
def test_custom_swap_back
  (x : U32) (y : U32) (st : State) (st0 : State) :
  Result (State × (U32 × U32))
  :=
  custom_swap_back U32 x y st (U32.ofInt 1 (by intlit)) st0

/- [external::test_swap_non_zero]: forward function -/
def test_swap_non_zero (x : U32) (st : State) : Result (State × U32) :=
  do
    let (st0, _) ← swap U32 x (U32.ofInt 0 (by intlit)) st
    let (st1, (x0, _)) ← swap_back U32 x (U32.ofInt 0 (by intlit)) st st0
    if x0 = (U32.ofInt 0 (by intlit))
    then Result.fail Error.panic
    else Result.ret (st1, x0)

end external