-module(cmd@new).
-compile(no_auto_import).

-export([new_command/0]).
-export_type([err/0]).

-type err() :: {failed_to_create_dir, binary()} |
    {failed_to_create_file, binary()} |
    {file_already_exists, binary()} |
    {combo, err(), err()} |
    {other, binary()}.

-spec input_path(integer()) -> binary().
input_path(Day) ->
    gleam@string:concat(
        [<<"input/"/utf8>>,
            <<"day_"/utf8>>,
            gleam@int:to_string(Day),
            <<".txt"/utf8>>]
    ).

-spec gleam_src_path(integer()) -> binary().
gleam_src_path(Day) ->
    gleam@string:concat(
        [<<"src/days/"/utf8>>,
            <<"day_"/utf8>>,
            gleam@int:to_string(Day),
            <<".gleam"/utf8>>]
    ).

-spec create_dir(binary()) -> {ok, nil} | {error, err()}.
create_dir(Dir) ->
    _pipe = Dir,
    _pipe@1 = gleam_erlang_ffi:make_directory(_pipe),
    handle_dir_open_res(_pipe@1, Dir).

-spec handle_dir_open_res(
    {ok, nil} | {error, gleam@erlang@file:reason()},
    binary()
) -> {ok, nil} | {error, err()}.
handle_dir_open_res(Res, Filename) ->
    case Res of
        {ok, nil} ->
            {ok, nil};

        {error, eexist} ->
            {ok, nil};

        _@1 ->
            _pipe = Filename,
            _pipe@1 = {failed_to_create_dir, _pipe},
            {error, _pipe@1}
    end.

-spec create_files(integer()) -> {ok, nil} | {error, snag:snag()}.
create_files(Day) ->
    Input_path = input_path(Day),
    Gleam_src_path = gleam_src_path(Day),
    Create_src_res = begin
        _pipe = gladvent_ffi:open_file_exclusive(Gleam_src_path),
        _pipe@1 = gleam@result:then(
            _pipe,
            fun(_capture) ->
                ffi@file:write(
                    _capture,
                    <<"pub fn pt_1(input: String) -> Int {
  todo
}

pub fn pt_2(input: String) -> Int {
  todo
}
"/utf8>>
                )
            end
        ),
        gleam@result:map_error(
            _pipe@1,
            fun(_capture@1) ->
                handle_file_open_failure(_capture@1, Gleam_src_path)
            end
        )
    end,
    Create_input_res = begin
        _pipe@2 = gladvent_ffi:open_file_exclusive(Input_path),
        gleam@result:map_error(
            _pipe@2,
            fun(_capture@2) ->
                handle_file_open_failure(_capture@2, Input_path)
            end
        )
    end,
    case {Create_input_res, Create_src_res} of
        {{ok, _@1}, {ok, _@2}} ->
            {ok, nil};

        {{error, E1}, {ok, _@3}} ->
            {error,
                begin
                    _pipe@3 = [<<"created "/utf8>>,
                        Gleam_src_path,
                        <<", but failed to create "/utf8>>,
                        Input_path],
                    _pipe@4 = gleam@string:concat(_pipe@3),
                    snag:layer(to_snag(E1), _pipe@4)
                end};

        {{ok, _@4}, {error, E2}} ->
            {error,
                begin
                    _pipe@5 = [<<"created "/utf8>>,
                        Input_path,
                        <<", but failed to create "/utf8>>,
                        Gleam_src_path],
                    _pipe@6 = gleam@string:concat(_pipe@5),
                    snag:layer(to_snag(E2), _pipe@6)
                end};

        {{error, E1@1}, {error, E2@1}} ->
            {error,
                begin
                    _pipe@7 = {combo, E1@1, E2@1},
                    to_snag(_pipe@7)
                end}
    end.

-spec handle_file_open_failure(gleam@erlang@file:reason(), binary()) -> err().
handle_file_open_failure(Reason, Filename) ->
    case Reason of
        eexist ->
            {file_already_exists, Filename};

        _@1 ->
            {failed_to_create_file, Filename}
    end.

-spec do(integer()) -> {ok, nil} | {error, snag:snag()}.
do(Day) ->
    case begin
        _pipe = gleam@list:try_map(
            [<<"input/"/utf8>>, <<"src/days/"/utf8>>],
            fun create_dir/1
        ),
        gleam@result:map_error(_pipe, fun to_snag/1)
    end of
        {error, _try} -> {error, _try};
        {ok, _@1} ->
            create_files(Day)
    end.

-spec collect({integer(), {ok, nil} | {error, snag:snag()}}) -> binary().
collect(X) ->
    Day = gleam@int:to_string(erlang:element(1, X)),
    case begin
        _pipe = erlang:element(2, X),
        _pipe@1 = snag:context(
            _pipe,
            <<"error occurred when initializing day "/utf8, Day/binary>>
        ),
        gleam@result:map_error(_pipe@1, fun snag:pretty_print/1)
    end of
        {ok, _@1} ->
            <<"initialized day: "/utf8, Day/binary>>;

        {error, Reason} ->
            Reason
    end.

-spec new_command() -> glint:stub({ok, list(binary())} | {error, snag:snag()}).
new_command() ->
    {stub,
        [<<"new"/utf8>>],
        fun run/1,
        [],
        <<"Create .gleam and input files"/utf8>>}.

-spec run(glint:command_input()) -> {ok, list(binary())} | {error, snag:snag()}.
run(Input) ->
    _pipe = erlang:element(2, Input),
    _pipe@1 = parse:days(_pipe),
    _pipe@2 = snag:context(
        _pipe@1,
        gleam@string:join(
            [<<"failed to initialize:"/utf8>> | erlang:element(2, Input)],
            <<" "/utf8>>
        )
    ),
    gleam@result:map(
        _pipe@2,
        fun(_capture) ->
            cmd:exec(_capture, endless, fun do/1, fun snag:new/1, fun collect/1)
        end
    ).

-spec to_snag(err()) -> snag:snag().
to_snag(E) ->
    _pipe@4 = case E of
        {failed_to_create_dir, D} ->
            <<"failed to create dir: "/utf8, D/binary>>;

        {failed_to_create_file, F} ->
            <<"failed to create file: "/utf8, F/binary>>;

        {file_already_exists, F@1} ->
            <<"file already exists: "/utf8, F@1/binary>>;

        {combo, E1, E2} ->
            _pipe = [E1, E2],
            _pipe@1 = gleam@list:map(_pipe, fun to_snag/1),
            _pipe@2 = gleam@list:map(_pipe@1, fun snag:line_print/1),
            _pipe@3 = gleam@list:filter(_pipe@2, fun(S) -> S /= <<""/utf8>> end),
            gleam@string:join(_pipe@3, <<" && "/utf8>>);

        {other, S@1} ->
            S@1
    end,
    snag:new(_pipe@4).