-module(scamper@visualization).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/scamper/visualization.gleam").
-export([to_mermaid/4, to_dot/4, machine_to_string/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(
    " Visualization utilities for scamper FSMs.\n"
    "\n"
    " Generate Mermaid diagrams, DOT graphs, and string representations.\n"
).

-file("src/scamper/visualization.gleam", 13).
?DOC(" Generate a Mermaid stateDiagram-v2 string from the config.\n").
-spec to_mermaid(
    scamper@config:config(JAO, any(), JAQ),
    JAO,
    fun((JAO) -> binary()),
    fun((JAQ) -> binary())
) -> binary().
to_mermaid(Config, Initial_state, State_to_string, Event_to_string) ->
    Transitions = scamper@config:get_transitions(Config),
    Final_states = scamper@config:get_final_states(Config),
    Header = <<"stateDiagram-v2"/utf8>>,
    Initial_arrow = <<"    [*] --> "/utf8,
        (State_to_string(Initial_state))/binary>>,
    Transition_lines = begin
        _pipe = Transitions,
        gleam@list:map(
            _pipe,
            fun(Rule) ->
                Label = Event_to_string(erlang:element(3, Rule)),
                Guard_suffix = case gleam@option:is_some(
                    erlang:element(5, Rule)
                ) of
                    true ->
                        <<" [guarded]"/utf8>>;

                    false ->
                        <<""/utf8>>
                end,
                <<<<<<<<<<<<"    "/utf8,
                                        (State_to_string(
                                            erlang:element(2, Rule)
                                        ))/binary>>/binary,
                                    " --> "/utf8>>/binary,
                                (State_to_string(erlang:element(4, Rule)))/binary>>/binary,
                            " : "/utf8>>/binary,
                        Label/binary>>/binary,
                    Guard_suffix/binary>>
            end
        )
    end,
    Final_lines = begin
        _pipe@1 = Final_states,
        gleam@list:map(
            _pipe@1,
            fun(S) ->
                <<<<"    "/utf8, (State_to_string(S))/binary>>/binary,
                    " --> [*]"/utf8>>
            end
        )
    end,
    _pipe@2 = [Header, Initial_arrow],
    _pipe@3 = lists:append(_pipe@2, Transition_lines),
    _pipe@4 = lists:append(_pipe@3, Final_lines),
    gleam@string:join(_pipe@4, <<"\n"/utf8>>).

-file("src/scamper/visualization.gleam", 57).
?DOC(" Generate a DOT (Graphviz) graph string from the config.\n").
-spec to_dot(
    scamper@config:config(JAU, any(), JAW),
    JAU,
    fun((JAU) -> binary()),
    fun((JAW) -> binary())
) -> binary().
to_dot(Config, Initial_state, State_to_string, Event_to_string) ->
    Transitions = scamper@config:get_transitions(Config),
    Final_states = scamper@config:get_final_states(Config),
    Header_lines = [<<"digraph FSM {"/utf8>>,
        <<"    rankdir=LR;"/utf8>>,
        <<"    node [shape=circle];"/utf8>>,
        <<"    __start__ [shape=point];"/utf8>>],
    Final_node_lines = begin
        _pipe = Final_states,
        gleam@list:map(
            _pipe,
            fun(S) ->
                <<<<"    "/utf8, (State_to_string(S))/binary>>/binary,
                    " [shape=doublecircle];"/utf8>>
            end
        )
    end,
    Initial_edge = <<<<"    __start__ -> "/utf8,
            (State_to_string(Initial_state))/binary>>/binary,
        ";"/utf8>>,
    Transition_lines = begin
        _pipe@1 = Transitions,
        gleam@list:map(
            _pipe@1,
            fun(Rule) ->
                Label = Event_to_string(erlang:element(3, Rule)),
                Guard_suffix = case gleam@option:is_some(
                    erlang:element(5, Rule)
                ) of
                    true ->
                        <<" [guarded]"/utf8>>;

                    false ->
                        <<""/utf8>>
                end,
                <<<<<<<<<<<<<<"    "/utf8,
                                            (State_to_string(
                                                erlang:element(2, Rule)
                                            ))/binary>>/binary,
                                        " -> "/utf8>>/binary,
                                    (State_to_string(erlang:element(4, Rule)))/binary>>/binary,
                                " [label=\""/utf8>>/binary,
                            Label/binary>>/binary,
                        Guard_suffix/binary>>/binary,
                    "\"];"/utf8>>
            end
        )
    end,
    Footer = <<"}"/utf8>>,
    _pipe@2 = Header_lines,
    _pipe@3 = lists:append(_pipe@2, Final_node_lines),
    _pipe@4 = lists:append(_pipe@3, [Initial_edge]),
    _pipe@5 = lists:append(_pipe@4, Transition_lines),
    _pipe@6 = lists:append(_pipe@5, [Footer]),
    gleam@string:join(_pipe@6, <<"\n"/utf8>>).

-file("src/scamper/visualization.gleam", 114).
?DOC(" Generate a one-line summary of a machine's current state.\n").
-spec machine_to_string(
    scamper:machine(JBA, any(), any()),
    fun((JBA) -> binary())
) -> binary().
machine_to_string(Machine, State_to_string) ->
    State_str = State_to_string(scamper:current_state(Machine)),
    History_count = erlang:length(scamper:history(Machine)),
    <<<<<<<<"Machine(state: "/utf8, State_str/binary>>/binary,
                ", history: "/utf8>>/binary,
            (erlang:integer_to_binary(History_count))/binary>>/binary,
        ")"/utf8>>.