theory Perm
imports 
  "../Nominal-General/Nominal2_Base"
  "../Nominal-General/Nominal2_Atoms"
begin


(* permutations for quotient types *)

ML {* Class_Target.prove_instantiation_exit_result *}

ML {*
fun quotient_lift_consts_export qtys spec ctxt =
let
  val (result, ctxt') = fold_map (Quotient_Def.quotient_lift_const qtys) spec ctxt;
  val (ts_loc, defs_loc) = split_list result;
  val morphism = ProofContext.export_morphism ctxt' ctxt;
  val ts = map (Morphism.term morphism) ts_loc
  val defs = Morphism.fact morphism defs_loc
in
  (ts, defs, ctxt')
end
*}

ML {*
fun define_lifted_perms qtys full_tnames name_term_pairs thms thy =
let
  val lthy =
    Theory_Target.instantiation (full_tnames, [], @{sort pt}) thy;
  val (_, _, lthy') = quotient_lift_consts_export qtys name_term_pairs lthy;
  val lifted_thms = map (Quotient_Tacs.lifted qtys lthy') thms;
  fun tac _ =
    Class.intro_classes_tac [] THEN
    (ALLGOALS (resolve_tac lifted_thms))
  val lthy'' = Class.prove_instantiation_instance tac lthy'
in
  Local_Theory.exit_global lthy''
end
*}

ML {*
fun neq_to_rel r neq =
let
  val neq = HOLogic.dest_Trueprop (prop_of neq)
  val eq = HOLogic.dest_not neq
  val (lhs, rhs) = HOLogic.dest_eq eq
  val rel = r $ lhs $ rhs
  val nrel = HOLogic.mk_not rel
in
  HOLogic.mk_Trueprop nrel
end
*}

ML {*
fun neq_to_rel_tac cases distinct =
  rtac notI THEN' eresolve_tac cases THEN_ALL_NEW asm_full_simp_tac (HOL_ss addsimps distinct)
*}

ML {*
fun distinct_rel ctxt cases (dists, rel) =
let
  val ((_, thms), ctxt') = Variable.import false dists ctxt
  val terms = map (neq_to_rel rel) thms
  val nrels = map (fn t => Goal.prove ctxt' [] [] t (fn _ => neq_to_rel_tac cases dists 1)) terms
in
  Variable.export ctxt' ctxt nrels
end
*}



(* Test *)
(*
atom_decl name

datatype trm =
  Var "name"
| App "trm" "(trm list) list"
| Lam "name" "trm"
| Let "bp" "trm" "trm"
and bp =
  BUnit
| BVar "name"
| BPair "bp" "bp"

setup {* fn thy =>
let 
  val info = Datatype.the_info thy "Perm.trm"
in
  define_raw_perms info 2 thy |> snd
end
*}

print_theorems
*)

end