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(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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open Protocol
open Tezos_micheline
open Micheline_parser
open Micheline

type parsed = {
  source : string;
  unexpanded : string canonical;
  expanded : Michelson_v1_primitives.prim canonical;
  expansion_table : (int * (Micheline_parser.location * int list)) list;
  unexpansion_table : (int * int) list;
}

let compare_parsed = Stdlib.compare

(* Unexpanded toplevel expression should be a sequence *)
let expand_all source ast errors =
  let unexpanded, loc_table = extract_locations ast in
  let expanded, expansion_errors =
    Michelson_v1_macros.expand_rec (root unexpanded)
  in
  let expanded, unexpansion_table = extract_locations expanded in
  let expansion_table =
    let sorted =
      List.sort (fun (_, a) (_, b) -> Stdlib.compare a b) unexpansion_table
    in
    let grouped =
      let rec group = function
        | acc, [] -> acc
        | [], (u, e) :: r -> group ([(e, [u])], r)
        | ((pe, us) :: racc as acc), (u, e) :: r ->
            if e = pe then group ((e, u :: us) :: racc, r)
            else group ((e, [u]) :: acc, r)
      in
      group ([], sorted)
    in
    match
      List.map2
        ~when_different_lengths:()
        (fun (l, ploc) (l', elocs) ->
          assert (l = l') ;
          (l, (ploc, elocs)))
        (List.sort Stdlib.compare loc_table)
        (List.sort Stdlib.compare grouped)
    with
    | Ok v -> v
    | Error () -> invalid_arg "Michelson_v1_parser.expand_all"
  in
  match
    Environment.wrap_error (Michelson_v1_primitives.prims_of_strings expanded)
  with
  | Ok expanded ->
      ( {source; unexpanded; expanded; expansion_table; unexpansion_table},
        errors @ expansion_errors )
  | Error errs ->
      ( {
          source;
          unexpanded;
          expanded = Micheline.strip_locations (Seq ((), []));
          expansion_table;
          unexpansion_table;
        },
        errors @ expansion_errors @ errs )

let parse_toplevel ?check source =
  let tokens, lexing_errors = Micheline_parser.tokenize source in
  let asts, parsing_errors = Micheline_parser.parse_toplevel ?check tokens in
  let ast =
    let start = min_point asts and stop = max_point asts in
    Seq ({start; stop}, asts)
  in
  expand_all source ast (lexing_errors @ parsing_errors)

let parse_expression ?check source =
  let tokens, lexing_errors = Micheline_parser.tokenize source in
  let ast, parsing_errors = Micheline_parser.parse_expression ?check tokens in
  expand_all source ast (lexing_errors @ parsing_errors)

let expand_all ~source ~original = expand_all source original []