-module(sqlode@sql_paths).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/sqlode/sql_paths.gleam").
-export([expand/2]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

?MODULEDOC(
    " Shared `.sql` path expansion used by `generate` and `verify`.\n"
    "\n"
    " A configured `schema` or `queries` entry may be either a direct\n"
    " path to a `.sql` file or a directory of `.sql` files. This\n"
    " module applies the expansion rules both commands rely on so the\n"
    " CLI presents a single, consistent surface: directories expand\n"
    " to their `.sql` children in ascii-sorted order, empty\n"
    " directories fail, and errors carry the originating path so\n"
    " callers can render diagnostics.\n"
).

-file("src/sqlode/sql_paths.gleam", 21).
?DOC(
    " Expand directory entries in `paths` into their `.sql` children.\n"
    " File entries pass through unchanged. `error_fn` maps an\n"
    " offending path and detail string into the caller's error type\n"
    " so each command can attach its own wrapping variant while the\n"
    " underlying diagnostic text stays consistent.\n"
).
-spec expand(list(binary()), fun((binary(), binary()) -> QTN)) -> {ok,
        list(binary())} |
    {error, QTN}.
expand(Paths, Error_fn) ->
    _pipe = Paths,
    _pipe@3 = gleam@list:try_map(
        _pipe,
        fun(Path) -> case simplifile_erl:is_directory(Path) of
                {ok, true} ->
                    case simplifile:get_files(Path) of
                        {ok, Files} ->
                            Sql_files = begin
                                _pipe@1 = Files,
                                _pipe@2 = gleam@list:filter(
                                    _pipe@1,
                                    fun(F) ->
                                        gleam_stdlib:string_ends_with(
                                            F,
                                            <<".sql"/utf8>>
                                        )
                                    end
                                ),
                                gleam@list:sort(
                                    _pipe@2,
                                    fun gleam@string:compare/2
                                )
                            end,
                            case Sql_files of
                                [] ->
                                    {error,
                                        Error_fn(
                                            Path,
                                            <<"Directory contains no .sql files"/utf8>>
                                        )};

                                _ ->
                                    {ok, Sql_files}
                            end;

                        {error, Error} ->
                            {error,
                                Error_fn(
                                    Path,
                                    <<"Failed to read directory: "/utf8,
                                        (simplifile:describe_error(Error))/binary>>
                                )}
                    end;

                {ok, false} ->
                    {ok, [Path]};

                {error, Error@1} ->
                    {error,
                        Error_fn(
                            Path,
                            <<"Failed to access path: "/utf8,
                                (simplifile:describe_error(Error@1))/binary>>
                        )}
            end end
    ),
    gleam@result:map(_pipe@3, fun lists:append/1).