-module(illustrious@server).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([build_app/1, handle_request/5]).
-export_type([server_result/1, server_app_builder/4, server_app/4, api_request/0]).

-type server_result(OTF) :: {view,
        lustre@internals@vdom:element(illustrious@state:illustrious_action(OTF))} |
    {data, gleam@json:json()} |
    {server_error, binary()} |
    no_result.

-type server_app_builder(OTG, OTH, OTI, OTJ) :: {server_app_builder,
        fun((list(binary()), OTH) -> lustre@internals@vdom:element(illustrious@state:illustrious_action(OTI))),
        fun((list(binary()), OTH) -> lustre@internals@vdom:element(illustrious@state:illustrious_action(OTI))),
        OTH,
        fun((OTH, OTI) -> {OTH,
            lustre@effect:effect(illustrious@state:illustrious_action(OTI))}),
        fun((gleam@dynamic:dynamic_()) -> {ok,
                illustrious@state:illustrious_action(OTI)} |
            {error, list(gleam@dynamic:decode_error())}),
        fun((list(binary()), OTG) -> {ok, gleam@json:json()} | {error, OTJ}),
        fun((list(binary()), OTG) -> {ok, gleam@json:json()} | {error, OTJ}),
        fun((OTJ) -> binary())}.

-opaque server_app(OTK, OTL, OTM, OTN) :: {server_app,
        fun((list(binary()), OTL) -> lustre@internals@vdom:element(illustrious@state:illustrious_action(OTM))),
        fun((list(binary()), OTL) -> lustre@internals@vdom:element(illustrious@state:illustrious_action(OTM))),
        OTL,
        fun((illustrious@state:illustrious_model(OTL), illustrious@state:illustrious_action(OTM)) -> {illustrious@state:illustrious_model(OTL),
            lustre@effect:effect(illustrious@state:illustrious_action(OTM))}),
        fun((gleam@dynamic:dynamic_()) -> {ok,
                illustrious@state:illustrious_action(OTM)} |
            {error, list(gleam@dynamic:decode_error())}),
        fun((list(binary()), OTK) -> {ok, gleam@json:json()} | {error, OTN}),
        fun((list(binary()), OTK) -> {ok, gleam@json:json()} | {error, OTN}),
        fun((OTN) -> binary())}.

-type api_request() :: {api_request, binary()}.

-spec build_app(server_app_builder(OTW, OTX, OTY, OTZ)) -> server_app(OTW, OTX, OTY, OTZ).
build_app(Builder) ->
    Updater = illustrious@internal@state_priv:wrap_updater(
        erlang:element(5, Builder),
        erlang:element(6, Builder)
    ),
    {server_app,
        erlang:element(2, Builder),
        erlang:element(3, Builder),
        erlang:element(4, Builder),
        Updater,
        erlang:element(6, Builder),
        erlang:element(7, Builder),
        erlang:element(8, Builder),
        erlang:element(9, Builder)}.

-spec api_request_decoder(binary()) -> {ok, api_request()} |
    {error, gleam@json:decode_error()}.
api_request_decoder(Json) ->
    gleam@json:decode(
        Json,
        gleam@dynamic:decode1(
            fun(Field@0) -> {api_request, Field@0} end,
            gleam@dynamic:field(<<"path"/utf8>>, fun gleam@dynamic:string/1)
        )
    ).

-spec serialize_json_decode_error(gleam@json:decode_error()) -> binary().
serialize_json_decode_error(_) ->
    <<"Failed to deserialize request"/utf8>>.

-spec wrap_element(
    lustre@internals@vdom:element(illustrious@state:illustrious_action(OUU)),
    lustre@internals@vdom:element(illustrious@state:illustrious_action(OUU)),
    binary()
) -> lustre@internals@vdom:element(illustrious@state:illustrious_action(OUU)).
wrap_element(Children, Headers, Baked_data) ->
    lustre@element@html:html(
        [],
        [lustre@element@html:head(
                [],
                [lustre@element@html:link(
                        [lustre@attribute:rel(<<"stylesheet"/utf8>>),
                            lustre@attribute:type_(<<"text/css"/utf8>>),
                            lustre@attribute:href(<<"/static/client.css"/utf8>>)]
                    ),
                    Headers]
            ),
            lustre@element@html:body(
                [],
                [lustre@element@html:'div'(
                        [lustre@attribute:id(<<"app"/utf8>>)],
                        [Children]
                    ),
                    lustre@element@html:script(
                        [lustre@attribute:id(<<"illustrious_baked_data"/utf8>>),
                            lustre@attribute:type_(<<"application/json"/utf8>>)],
                        Baked_data
                    ),
                    lustre@element@html:script(
                        [lustre@attribute:src(<<"/static/client.mjs"/utf8>>),
                            lustre@attribute:type_(<<"module"/utf8>>)],
                        <<""/utf8>>
                    )]
            )]
    ).

-spec handle_request(
    server_app(OUF, any(), OUH, any()),
    gleam@http:method(),
    list(binary()),
    binary(),
    OUF
) -> server_result(OUH).
handle_request(App, Method, Path, Body, Context) ->
    case {Method, Path} of
        {post, [<<"illustrious_api"/utf8>>]} ->
            case api_request_decoder(Body) of
                {error, Decode_error} ->
                    {server_error, serialize_json_decode_error(Decode_error)};

                {ok, Req} ->
                    Path@1 = illustrious@internal@router:parse_path(
                        erlang:element(2, Req)
                    ),
                    case (erlang:element(8, App))(Path@1, Context) of
                        {error, Err} ->
                            {server_error, (erlang:element(9, App))(Err)};

                        {ok, Json} ->
                            {data, Json}
                    end
            end;

        {get, Path@2} ->
            Init_result = (erlang:element(7, App))(Path@2, Context),
            case Init_result of
                {error, Error} ->
                    {server_error, (erlang:element(9, App))(Error)};

                {ok, Json@1} ->
                    Json_str = gleam@json:to_string(Json@1),
                    Model@1 = case gleam@json:decode(
                        Json_str,
                        gleam@dynamic:list(erlang:element(6, App))
                    ) of
                        {ok, Actions} ->
                            gleam@list:fold(
                                Actions,
                                {illustrious_model,
                                    Path@2,
                                    erlang:element(4, App)},
                                fun(Model, Action) ->
                                    erlang:element(
                                        1,
                                        (erlang:element(5, App))(Model, Action)
                                    )
                                end
                            );

                        _ ->
                            _assert_subject = gleam@json:decode(
                                Json_str,
                                erlang:element(6, App)
                            ),
                            {ok, Action@1} = case _assert_subject of
                                {ok, _} -> _assert_subject;
                                _assert_fail ->
                                    erlang:error(#{gleam_error => let_assert,
                                                message => <<"Assertion pattern match failed"/utf8>>,
                                                value => _assert_fail,
                                                module => <<"illustrious/server"/utf8>>,
                                                function => <<"handle_request"/utf8>>,
                                                line => 153})
                            end,
                            erlang:element(
                                1,
                                (erlang:element(5, App))(
                                    {illustrious_model,
                                        Path@2,
                                        erlang:element(4, App)},
                                    Action@1
                                )
                            )
                    end,
                    Element = (erlang:element(2, App))(
                        erlang:element(2, Model@1),
                        erlang:element(3, Model@1)
                    ),
                    Headers = (erlang:element(3, App))(
                        erlang:element(2, Model@1),
                        erlang:element(3, Model@1)
                    ),
                    {view, wrap_element(Element, Headers, Json_str)}
            end;

        {_, _} ->
            no_result
    end.