Require Import ADPUnif.
Require Import ADecomp.
Require Import ADuplicateSymb.
Require Import AGraph.
Require Import APolyInt_MA.
Require Import ATrs.
Require Import List.
Require Import LogicUtil.
Require Import MonotonePolynom.
Require Import Polynom.
Require Import SN.
Require Import VecUtil.

Open Scope nat_scope.
(* termination problem *)

Module M.
  Inductive symb : Type :=
  | _0_1 : symb
  | minus : symb
  | quot : symb
  | s : symb.
End M.

Lemma eq_symb_dec : forall f g : M.symb, {f=g}+{~f=g}.

Proof.
decide equality.
Defined.

Open Scope nat_scope.
Definition ar (s : M.symb) : nat :=
  match s with
  | M._0_1 => 0
  | M.minus => 2
  | M.quot => 2
  | M.s => 1
  end.

Definition s0 := ASignature.mkSignature ar eq_symb_dec.
Definition s0_p := s0.
Definition V0 := @ATerm.Var s0.
Definition F0 := @ATerm.Fun s0.
Definition R0 := @ATrs.mkRule s0.

Module S0.
  Definition _0_1 := F0 M._0_1 Vnil.
  Definition minus x2 x1 := F0 M.minus (Vcons x2 (Vcons x1 Vnil)).
  Definition quot x2 x1 := F0 M.quot (Vcons x2 (Vcons x1 Vnil)).
  Definition s x1 := F0 M.s (Vcons x1 Vnil).
End S0.

Definition E :=
   @nil (@ATrs.rule s0).

Definition R :=
   R0 (S0.minus (V0 0) S0._0_1)
      (V0 0)
:: R0 (S0.minus (S0.s (V0 0)) (S0.s (V0 1)))
      (S0.minus (V0 0) (V0 1))
:: R0 (S0.quot S0._0_1 (S0.s (V0 0)))
      S0._0_1
:: R0 (S0.quot (S0.s (V0 0)) (S0.s (V0 1)))
      (S0.s (S0.quot (S0.minus (V0 0) (V0 1)) (S0.s (V0 1))))
:: @nil (@ATrs.rule s0).

Definition rel := ATrs.red_mod E R.

(* symbol marking *)

Definition s1 := dup_sig s0.
Definition s1_p := s0.
Definition V1 := @ATerm.Var s1.
Definition F1 := @ATerm.Fun s1.
Definition R1 := @ATrs.mkRule s1.

Module S1.
  Definition h_0_1 := F1 (hd_symb s1_p M._0_1) Vnil.
  Definition _0_1 := F1 (int_symb s1_p M._0_1) Vnil.
  Definition hminus x2 x1 := F1 (hd_symb s1_p M.minus) (Vcons x2 (Vcons x1 Vnil)).
  Definition minus x2 x1 := F1 (int_symb s1_p M.minus) (Vcons x2 (Vcons x1 Vnil)).
  Definition hquot x2 x1 := F1 (hd_symb s1_p M.quot) (Vcons x2 (Vcons x1 Vnil)).
  Definition quot x2 x1 := F1 (int_symb s1_p M.quot) (Vcons x2 (Vcons x1 Vnil)).
  Definition hs x1 := F1 (hd_symb s1_p M.s) (Vcons x1 Vnil).
  Definition s x1 := F1 (int_symb s1_p M.s) (Vcons x1 Vnil).
End S1.

(* graph decomposition 1 *)

Definition cs1 : list (list (@ATrs.rule s1)) :=

   (  R1 (S1.hminus (S1.s (V1 0)) (S1.s (V1 1)))
         (S1.hminus (V1 0) (V1 1))
   :: nil)

:: (  R1 (S1.hquot (S1.s (V1 0)) (S1.s (V1 1)))
         (S1.hminus (V1 0) (V1 1))
   :: nil)

:: (  R1 (S1.hquot (S1.s (V1 0)) (S1.s (V1 1)))
         (S1.hquot (S1.minus (V1 0) (V1 1)) (S1.s (V1 1)))
   :: nil)

:: nil.

(* polynomial interpretation 1 *)

Module PIS1 (*<: TPolyInt*).

  Definition sig := s1.

  Definition trsInt f :=
    match f as f return poly (@ASignature.arity s1 f) with
    | (hd_symb M.minus) =>
         (1%Z, (Vcons 1 (Vcons 0 Vnil)))
      :: nil
    | (int_symb M.minus) =>
         (1%Z, (Vcons 1 (Vcons 0 Vnil)))
      :: nil
    | (hd_symb M._0_1) =>
         nil
    | (int_symb M._0_1) =>
         (1%Z, Vnil)
      :: nil
    | (hd_symb M.s) =>
         nil
    | (int_symb M.s) =>
         (2%Z, (Vcons 0 Vnil))
      :: (1%Z, (Vcons 1 Vnil))
      :: nil
    | (hd_symb M.quot) =>
         nil
    | (int_symb M.quot) =>
         (1%Z, (Vcons 1 (Vcons 0 Vnil)))
      :: nil
    end.

  Lemma trsInt_wm : forall f, pweak_monotone (trsInt f).
  Proof.
    pmonotone.
  Qed.

End PIS1.

Module PI1 := PolyInt PIS1.

(* polynomial interpretation 2 *)

Module PIS2 (*<: TPolyInt*).

  Definition sig := s1.

  Definition trsInt f :=
    match f as f return poly (@ASignature.arity s1 f) with
    | (hd_symb M.minus) =>
         nil
    | (int_symb M.minus) =>
         (1%Z, (Vcons 1 (Vcons 0 Vnil)))
      :: nil
    | (hd_symb M._0_1) =>
         nil
    | (int_symb M._0_1) =>
         (3%Z, Vnil)
      :: nil
    | (hd_symb M.s) =>
         nil
    | (int_symb M.s) =>
         (1%Z, (Vcons 0 Vnil))
      :: (1%Z, (Vcons 1 Vnil))
      :: nil
    | (hd_symb M.quot) =>
         (1%Z, (Vcons 1 (Vcons 0 Vnil)))
      :: nil
    | (int_symb M.quot) =>
         (3%Z, (Vcons 1 (Vcons 0 Vnil)))
      :: nil
    end.

  Lemma trsInt_wm : forall f, pweak_monotone (trsInt f).
  Proof.
    pmonotone.
  Qed.

End PIS2.

Module PI2 := PolyInt PIS2.

(* termination proof *)

Lemma termination : WF rel.

Proof.
unfold rel.
dp_trans.
mark.
let D := fresh "D" in let R := fresh "R" in set_rules_to D; set_mod_rules_to R;
graph_decomp (dpg_unif_N 100 R D) cs1; subst D; subst R.
dpg_unif_N_correct.
right. PI1.prove_termination.
termination_trivial.
left. co_scc.
right. PI2.prove_termination.
termination_trivial.
Qed.