-module(roundabout).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/roundabout.gleam").
-export([route/3, fixed/1, str/1, int/1, parse_definitions/2, parse/1, main/2]).
-export_type([segment/0, route/0]).

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

-opaque segment() :: {fixed, binary()} | {str, binary()} | {int, binary()}.

-opaque route() :: {route, binary(), list(segment()), list(route())}.

-file("src/roundabout.gleam", 44).
?DOC(
    " Make a route defintion\n"
    "\n"
    " e.g.\n"
    " ```gleam\n"
    " route(\"users\", [fixed(\"users\"), int(\"user_id\")], [])\n"
    " ```\n"
    "\n"
    " `name` is the name for this route, this will be used for generating the variant names and helper names.\n"
    "\n"
    " `path` defines the url segments e.g. /users/1.\n"
    "\n"
    " `children` generates sub types for nested routes, this is useful for middleware.\n"
).
-spec route(binary(), list(segment()), list(route())) -> route().
route(Name, Path, Children) ->
    {route, Name, Path, Children}.

-file("src/roundabout.gleam", 58).
?DOC(
    " A path segment that is constant\n"
    "\n"
    " e.g.\n"
    " ```gleam\n"
    " [fixed(\"users\"), str(\"user_id\")]\n"
    " ```\n"
).
-spec fixed(binary()) -> segment().
fixed(Value) ->
    {fixed, Value}.

-file("src/roundabout.gleam", 68).
?DOC(
    " A path segment that should resolve to a string\n"
    "\n"
    " e.g.\n"
    " ```gleam\n"
    " [fixed(\"users\"), str(\"user_id\")]\n"
    " ```\n"
).
-spec str(binary()) -> segment().
str(Name) ->
    {str, Name}.

-file("src/roundabout.gleam", 78).
?DOC(
    " A path segment that should resolve to an integer\n"
    "\n"
    " e.g.\n"
    " ```gleam\n"
    " [fixed(\"users\"), int(\"user_id\")]\n"
    " ```\n"
).
-spec int(binary()) -> segment().
int(Name) ->
    {int, Name}.

-file("src/roundabout.gleam", 152).
-spec assert_no_duplicate_variant_names(
    binary(),
    list(roundabout@internal@node:node_())
) -> {ok, list(roundabout@internal@node:node_())} | {error, binary()}.
assert_no_duplicate_variant_names(Parent_name, Nodes) ->
    Variant_names = gleam@list:map(
        Nodes,
        fun(Item) ->
            roundabout@internal@name:parameter_name(
                erlang:element(2, erlang:element(2, Item))
            )
        end
    ),
    As_set = gleam@set:from_list(Variant_names),
    case erlang:length(Variant_names) =:= gleam@set:size(As_set) of
        true ->
            {ok, Nodes};

        false ->
            {error,
                <<<<"Route "/utf8, Parent_name/binary>>/binary,
                    " contains duplicate route names"/utf8>>}
    end.

-file("src/roundabout.gleam", 210).
-spec assert_no_duplicate_segment_names(binary(), list(segment())) -> {ok,
        list(segment())} |
    {error, binary()}.
assert_no_duplicate_segment_names(Node_name, Segments) ->
    Segment_names = gleam@list:filter_map(Segments, fun(Seg) -> case Seg of
                {fixed, _} ->
                    {error, nil};

                {str, Val} ->
                    {ok, justin:snake_case(Val)};

                {int, Val@1} ->
                    {ok, justin:snake_case(Val@1)}
            end end),
    As_set = gleam@set:from_list(Segment_names),
    case erlang:length(Segment_names) =:= gleam@set:size(As_set) of
        true ->
            {ok, Segments};

        false ->
            {error,
                <<<<"Route "/utf8, Node_name/binary>>/binary,
                    " contains duplicate segment names"/utf8>>}
    end.

-file("src/roundabout.gleam", 178).
-spec parse_definition_info(route()) -> {ok, roundabout@internal@node:info()} |
    {error, binary()}.
parse_definition_info(Input) ->
    gleam@result:'try'(
        assert_no_duplicate_segment_names(
            erlang:element(2, Input),
            erlang:element(3, Input)
        ),
        fun(Input_path) ->
            Path_result = begin
                _pipe = Input_path,
                gleam@list:try_map(_pipe, fun(Seg) -> case Seg of
                            {fixed, Val} ->
                                _pipe@1 = roundabout@internal@fixed:new(Val),
                                gleam@result:map(
                                    _pipe@1,
                                    fun(Field@0) -> {seg_fixed, Field@0} end
                                );

                            {str, Val@1} ->
                                _pipe@2 = roundabout@internal@parameter:new(
                                    Val@1,
                                    str
                                ),
                                gleam@result:map(
                                    _pipe@2,
                                    fun(Field@0) -> {seg_param, Field@0} end
                                );

                            {int, Val@2} ->
                                _pipe@3 = roundabout@internal@parameter:new(
                                    Val@2,
                                    int
                                ),
                                gleam@result:map(
                                    _pipe@3,
                                    fun(Field@0) -> {seg_param, Field@0} end
                                )
                        end end)
            end,
            gleam@result:'try'(
                roundabout@internal@name:new(erlang:element(2, Input)),
                fun(Name) ->
                    gleam@result:'try'(
                        Path_result,
                        fun(Path) -> _pipe@4 = {info, Name, Path},
                            {ok, _pipe@4} end
                    )
                end
            )
        end
    ).

-file("src/roundabout.gleam", 167).
-spec parse_definition(route()) -> {ok, roundabout@internal@node:node_()} |
    {error, binary()}.
parse_definition(Definition) ->
    gleam@result:'try'(
        parse_definition_info(Definition),
        fun(Info) ->
            gleam@result:'try'(
                parse_definitions(
                    erlang:element(2, Definition),
                    erlang:element(4, Definition)
                ),
                fun(Children) -> _pipe = {node, Info, Children},
                    {ok, _pipe} end
            )
        end
    ).

-file("src/roundabout.gleam", 141).
?DOC(false).
-spec parse_definitions(binary(), list(route())) -> {ok,
        list(roundabout@internal@node:node_())} |
    {error, binary()}.
parse_definitions(Parent_name, Definitions) ->
    gleam@result:'try'(
        gleam@list:try_map(Definitions, fun parse_definition/1),
        fun(Nodes) ->
            gleam@result:'try'(
                assert_no_duplicate_variant_names(Parent_name, Nodes),
                fun(Nodes@1) -> {ok, Nodes@1} end
            )
        end
    ).

-file("src/roundabout.gleam", 131).
?DOC(false).
-spec parse(list(route())) -> {ok, roundabout@internal@node:node_()} |
    {error, binary()}.
parse(Definitions) ->
    gleam@result:'try'(
        parse_definitions(<<"root"/utf8>>, Definitions),
        fun(Children) ->
            Root = {node,
                {info, roundabout@internal@name:unsafe(<<""/utf8>>), []},
                Children},
            {ok, Root}
        end
    ).

-file("src/roundabout.gleam", 87).
?DOC(
    " Generate the routes file\n"
    "\n"
    " ```gleam\n"
    " roundabout.main(route_definitions, \"src/my_app/generated/routes\")\n"
    " ```\n"
).
-spec main(list(route()), binary()) -> {ok, nil} | {error, binary()}.
main(Definitions, Output_path) ->
    gleam@result:'try'(
        parse(Definitions),
        fun(Root) ->
            Output_path@1 = case gleam_stdlib:string_ends_with(
                Output_path,
                <<".gleam"/utf8>>
            ) of
                true ->
                    Output_path;

                false ->
                    <<Output_path/binary, ".gleam"/utf8>>
            end,
            Types = roundabout@internal@generate_types:generate_type_rec(
                roundabout@internal@ancestors:empty(),
                Root
            ),
            Segments_to_route = roundabout@internal@generate_segments_to_route:generate_segments_to_route_rec(
                roundabout@internal@ancestors:empty(),
                Root
            ),
            Routes_to_path = roundabout@internal@generate_route_to_path:generate_route_to_path_rec(
                roundabout@internal@ancestors:empty(),
                Root
            ),
            Helpers = roundabout@internal@generate_helpers:generate_helpers_rec(
                roundabout@internal@ancestors:empty(),
                Root
            ),
            Utils = roundabout@internal@generate_other:generate_utils(),
            All = glam@doc:concat(
                [roundabout@internal@generate_other:generate_header(),
                    roundabout@internal@generate_other:generate_imports(),
                    Types,
                    Segments_to_route,
                    Routes_to_path,
                    Helpers,
                    Utils]
            ),
            Generated_code = begin
                _pipe = All,
                glam@doc:to_string(_pipe, 80)
            end,
            Output_dir = filepath:directory_name(Output_path@1),
            _ = simplifile:create_directory_all(Output_dir),
            _ = simplifile:write(Output_path@1, Generated_code),
            {ok, nil}
        end
    ).