package dunolint

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(*********************************************************************************)
(*  Dunolint - A tool to lint and help manage files in dune projects             *)
(*  Copyright (C) 2024-2025 Mathieu Barbin <mathieu.barbin@gmail.com>            *)
(*                                                                               *)
(*  This file is part of Dunolint.                                               *)
(*                                                                               *)
(*  Dunolint is free software; you can redistribute it and/or modify it          *)
(*  under the terms of the GNU Lesser General Public License as published by     *)
(*  the Free Software Foundation either version 3 of the License, or any later   *)
(*  version, with the LGPL-3.0 Linking Exception.                                *)
(*                                                                               *)
(*  Dunolint is distributed in the hope that it will be useful, but WITHOUT      *)
(*  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or        *)
(*  FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License  *)
(*  and the file `NOTICE.md` at the root of this repository for more details.    *)
(*                                                                               *)
(*  You should have received a copy of the GNU Lesser General Public License     *)
(*  and the LGPL-3.0 Linking Exception along with this library. If not, see      *)
(*  <http://www.gnu.org/licenses/> and <https://spdx.org>, respectively.         *)
(*********************************************************************************)

let field_name = "name"

type t = { mutable name : Dune_project.Name.t } [@@deriving sexp_of]

let create ~name = { name }
let name t = t.name
let set_name t ~name = t.name <- name

module Handler =
  Dunolinter.Sexp_handler.Make_sexpable
    (struct
      let field_name = field_name
    end)
    (Dune_project.Name)

let read ~sexps_rewriter ~field =
  let name = Handler.read ~sexps_rewriter ~field in
  { name }
;;

let write t = Handler.write t.name
let rewrite t ~sexps_rewriter ~field = Handler.rewrite t.name ~sexps_rewriter ~field

type predicate = Dune_project.Name.Predicate.t

let eval t ~predicate =
  (match (predicate : predicate) with
   | `equals name -> Dune_project.Name.equal name t.name
   | `is_prefix prefix -> String.is_prefix (Dune_project.Name.to_string t.name) ~prefix
   | `is_suffix suffix -> String.is_suffix (Dune_project.Name.to_string t.name) ~suffix)
  |> Dunolint.Trilang.const
;;

let enforce =
  Dunolinter.Linter.enforce
    (module Dune_project.Name.Predicate)
    ~eval
    ~enforce:(fun t predicate ->
      match predicate with
      | Not (`equals _) -> Eval
      | T (`equals name) ->
        t.name <- name;
        Ok
      | T (`is_prefix prefix) ->
        let value = Dune_project.Name.to_string t.name in
        if not (String.is_prefix value ~prefix)
        then t.name <- Dune_project.Name.v (prefix ^ value);
        Ok
      | Not (`is_prefix prefix) ->
        let value = Dune_project.Name.to_string t.name in
        (match String.chop_prefix value ~prefix with
         | None -> Ok
         | Some value ->
           t.name <- Dune_project.Name.v value;
           Ok)
      | T (`is_suffix suffix) ->
        let value = Dune_project.Name.to_string t.name in
        if not (String.is_suffix value ~suffix)
        then t.name <- Dune_project.Name.v (value ^ suffix);
        Ok
      | Not (`is_suffix suffix) ->
        let value = Dune_project.Name.to_string t.name in
        (match String.chop_suffix value ~suffix with
         | None -> Ok
         | Some value ->
           t.name <- Dune_project.Name.v value;
           Ok))
;;

module Top = struct
  type nonrec t = t

  let eval = eval
  let enforce = enforce
end

module Linter = struct
  type t = Top.t
  type predicate = Dune_project.Predicate.t

  let eval (t : t) ~predicate =
    match (predicate : Dune_project.Predicate.t) with
    | `name condition ->
      Dunolint.Trilang.eval condition ~f:(fun predicate -> Top.eval t ~predicate)
    | predicate ->
      let () =
        match[@coverage off] predicate with
        | `name _ -> assert false
        | `dune_lang_version _ | `generate_opam_files _ | `implicit_transitive_deps _ ->
          ()
      in
      Dunolint.Trilang.Undefined
  ;;

  let enforce =
    Dunolinter.Linter.enforce
      (module Dune_project.Predicate)
      ~eval
      ~enforce:(fun t predicate ->
        match predicate with
        | Not _ -> Eval
        | T condition ->
          (match condition with
           | `name condition ->
             Top.enforce t ~condition;
             Ok
           | condition ->
             let () =
               match[@coverage off] condition with
               | `name _ -> assert false
               | `dune_lang_version _
               | `generate_opam_files _
               | `implicit_transitive_deps _ -> ()
             in
             Unapplicable))
  ;;
end