(* Title:  Interpret/lucas-interpreter.sml

   Author: Walther Neuper 2019

   (c) due to copyright terms

*)

signature METHOD =

sig

  type T = Meth_Def.T

  val empty: T

  type id = Meth_Def.id

  val id_empty: id

  val id_to_string: id -> string

  type input

  (* TODO: ------------- remove always empty --- vvvvvvvvvvv -- vvv*)

  val prep_input : theory ->  Check_Unique.id -> string list -> id ->

     id * Problem.model_input * input * thm -> T * id

  val set_data: input -> theory -> theory

  val the_data: theory -> input

  val from_store: id -> T

  val from_store': theory -> id -> T

end

(**)

structure MethodC(**): METHOD(**) =

struct

(**)

type T = Meth_Def.T;

val empty = Meth_Def.empty;

type id = Meth_Def.id;

val id_empty = Meth_Def.id_empty;

val id_to_string = Meth_Def.id_to_string;

(** prepare MethodC for Store **)

(* a subset of MethodC.T record's fields *)

type input = 

  {calc: Rule_Def.calc list, crls: Rule_Set.T, errpats: Error_Pattern_Def.T list, nrls: Rule_Set.T,

    prls: Rule_Set.T, rew_ord': Rewrite_Ord.rew_ord', rls': Rule_Set.T, srls: Rule_Set.T}

fun prep_input thy guh (mathauthors: string list) (init: References_Def.id)

	    (metID, ppc,

        {rew_ord' = ro, rls' = rls, srls = srls, prls = prls, calc = _(*scr_isa_fns*), crls = cr,

          errpats = ep, nrls = nr}, scr) =

    let

      fun eq f (f', _) = f = f';

      val gi = filter (eq "#Given") ppc;

      val gi = (case gi of

		    [] => (writeln ("prep_input: in " ^ guh ^ " #Given is empty ?!?"); [])

		  | ((_, gi') :: []) => 

        (case \<^try>\<open> map (Problem.split_did o (TermC.parseNEW'' thy)) gi'\<close> of

          SOME x => x

        | NONE => raise ERROR ("prep_pbt: syntax raise ERROR in '#Given' of " ^ strs2str metID))

		  | _ => raise ERROR ("prep_pbt: more than one '#Given' in " ^ strs2str metID));

		  val gi = map (pair "#Given") gi;

		  val fi = filter (eq "#Find") ppc;

		  val fi = (case fi of

		    [] => (writeln ("prep_input: in " ^ guh ^ " #Find is empty ?!?"); [])

		  | ((_, fi') :: []) => 

        (case \<^try>\<open> map (Problem.split_did o (TermC.parseNEW'' thy)) fi'\<close> of

          SOME x => x

        | NONE => raise ERROR ("prep_pbt: syntax raise ERROR in '#Find' of " ^ strs2str metID))

		  | _ => raise ERROR ("prep_pbt: more than one '#Find' in " ^ strs2str metID));

		  val fi = map (pair "#Find") fi;

		  val re = filter (eq "#Relate") ppc;

		  val re = (case re of

		    [] => (writeln ("prep_input: in " ^ guh ^ " #Relate is empty ?!?"); [])

		  | ((_,re') :: []) =>

        (case \<^try>\<open> map (Problem.split_did o (TermC.parseNEW'' thy)) re'\<close> of

          SOME x => x

        | NONE => raise ERROR ("prep_pbt: syntax raise ERROR in '#Relate' of " ^ strs2str metID))

		  | _ => raise ERROR ("prep_pbt: more than one '#Relate' in " ^ strs2str metID));

		  val re = map (pair "#Relate") re;

		  val wh = filter (eq "#Where") ppc;

		  val wh = (case wh of

		    [] => (writeln ("prep_input: in " ^ guh ^ " #Where is empty ?!?"); [])

		  | ((_, wh') :: []) => 

        (case \<^try>\<open> map (TermC.parse_patt thy) wh'\<close> of

          SOME x => x

        | NONE => raise ERROR ("prep_pbt: syntax raise ERROR in '#Where' of " ^ strs2str metID))

		  | _ => raise ERROR ("prep_pbt: more than one '#Where' in " ^ strs2str metID));

		  val sc = Program.prep_program scr

		  val calc = if Thm.eq_thm (scr, @{thm refl}) then [] else Auto_Prog.get_calcs thy sc

    in

       ({guh = guh, mathauthors = mathauthors, init = init, ppc = gi @ fi @ re, pre = wh,

         rew_ord' = ro, erls = rls, srls = srls, prls = prls, calc = calc,

         crls = cr, errpats = ep, nrls = nr, scr = Rule.Prog sc}, metID)

    end;

(** Isar command **)

structure Data = Theory_Data

(

  type T = input option;

  val empty = NONE;

  val extend = I;

  fun merge _ = NONE;

);

val set_data = Data.put o SOME;

val the_data = the o Data.get;

local

val parse_program =

  Scan.option (Problem.parse_item \<^keyword>\<open>Program\<close> (Parse.position Parse.name));

val ml = ML_Lex.read;

val _ =

  Outer_Syntax.command \<^command_keyword>\<open>method\<close>

    "prepare ISAC method and register it to Knowledge Store"

    (Parse.name -- Parse.!!! (\<^keyword>\<open>:\<close> |-- Parse.name --

      Parse.!!! (\<^keyword>\<open>=\<close> |-- Parse.ML_source -- Problem.parse_authors --

        parse_program -- Problem.parse_model_input)) >>

      (fn (name, (id, (((source, maa), program), model_input))) => Toplevel.theory (fn thy =>

        let

          val metID = References_Def.explode_id id;

          val set_data =

            ML_Context.expression (Input.pos_of source)

              (ml "Theory.setup (MethodC.set_data (" @ ML_Lex.read_source source @ ml "))")

            |> Context.theory_map;

          val input = the_data (set_data thy);

          val thm =

            (case program of

              NONE => @{thm refl}

            | SOME a => Global_Theory.get_thm thy (Global_Theory.check_fact thy a));

          val arg = prep_input thy name maa id_empty (metID, model_input, input, thm);

        in KEStore_Elems.add_mets @{context} [arg] thy end)))

in end;

(** get MethodC from Store **)

(* TODO: throws exn 'get_pbt not found: ' ... confusing !! take 'ketype' as an argument *)

fun from_store metID = Store.get (get_mets ()) metID metID;

fun from_store' thy metID = Store.get (KEStore_Elems.get_mets thy) metID metID;

(**)end(**)