-- {-# OPTIONS --allow-unsolved-metas #-}

module Project.Do where

open import Project.Definitions
open import Project.Util

data StepResult (A : Type) : Set where
  part : State A → StepResult A
  done : Value A A → StepResult A

apply-kont : ∀ {Tv Tω} → Kont Tω Tv → Value Tω Tv → StepResult Tω
apply-kont {Tv} (kont (letk {Tc} Γ C E K)) v =
  part $ mkState Tc (Γ , Tv) C (E [ Tv ∶ v ]) K
apply-kont halt v = done v

apply-proc-clo : ∀ {Γ A B Tω} → Exp Tω (Γ , A) B → Env Tω Γ → Value Tω A → Kont Tω B → StepResult Tω
apply-proc-clo {Γ} {A} {B} body env arg k =
  let Γ′ = Γ , A in
  let E′ = env [ A ∶ arg ] in
  part $ mkState B Γ′ body E′ k

-- apply-proc : ∀ {A B Tω} → Value (A ⇒ B) → Value A → Kont Tω B → StepResult Tω
-- apply-proc {A} {B} (clo {Γ} x E) arg K =
--   let Γ′ = Γ , A in
--   let E′ = E [ A ∶ arg ] in
--   part $ mkState B Γ′ x E′ K
-- apply-proc (cont k) arg K = apply-kont {!   !} {!   !}