-module(router).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([new/0, add/4, get_handler/1]).
-export_type([router/0]).

-type router() :: {router,
        gleam@dict:dict(route:route(), fun((gleam@http@request:request(bitstring())) -> gleam@http@response:response(gleam@bytes_builder:bytes_builder())))}.

-spec new() -> router().
new() ->
    {router, gleam@dict:new()}.

-spec add(
    router(),
    gleam@http:method(),
    binary(),
    fun((gleam@http@request:request(bitstring())) -> gleam@http@response:response(gleam@bytes_builder:bytes_builder()))
) -> router().
add(Router, Method, Path, Handler) ->
    _pipe = erlang:element(2, Router),
    _pipe@1 = gleam@dict:insert(_pipe, route:new(Method, Path), Handler),
    {router, _pipe@1}.

-spec not_found(gleam@http@request:request(bitstring())) -> gleam@http@response:response(gleam@bytes_builder:bytes_builder()).
not_found(Req) ->
    _pipe = 404,
    _pipe@1 = gleam@http@response:new(_pipe),
    gleam@http@response:set_body(
        _pipe@1,
        gleam_stdlib:wrap_list(
            <<<<<<"Cannot "/utf8,
                        (begin
                            _pipe@2 = erlang:element(2, Req),
                            _pipe@3 = gleam@http:method_to_string(_pipe@2),
                            gleam@string:uppercase(_pipe@3)
                        end)/binary>>/binary,
                    " "/utf8>>/binary,
                (erlang:element(8, Req))/binary>>
        )
    ).

-spec get_handler(router()) -> fun((gleam@http@request:request(bitstring())) -> gleam@http@response:response(gleam@bytes_builder:bytes_builder())).
get_handler(Router) ->
    fun(Req) ->
        Route = route:new(erlang:element(2, Req), erlang:element(8, Req)),
        case begin
            _pipe = erlang:element(2, Router),
            gleam@dict:get(_pipe, Route)
        end of
            {ok, Handler} ->
                Handler(Req);

            {error, _} ->
                not_found(Req)
        end
    end.