import 'package:flutter/material.dart';
import 'package:flutter/scheduler.dart';
import 'package:wolf_3d_engine/wolf_3d_engine.dart';

// 1. The widget now only requires the engine!
abstract class BaseWolfRenderer extends StatefulWidget {
  final WolfEngine engine;

  const BaseWolfRenderer({
    required this.engine,
    super.key,
  });
}

abstract class BaseWolfRendererState<T extends BaseWolfRenderer>
    extends State<T>
    with SingleTickerProviderStateMixin {
  late final Ticker gameLoop;
  final FocusNode focusNode = FocusNode();

  Duration _lastTick = Duration.zero;

  @override
  void initState() {
    super.initState();
    // DO NOT initialize the engine here. Just start the loop!
    gameLoop = createTicker(_tick)..start();
    focusNode.requestFocus();
  }

  void _tick(Duration elapsed) {
    if (!widget.engine.isInitialized) return;

    Duration delta = elapsed - _lastTick;
    _lastTick = elapsed;

    // Tick the shared engine
    widget.engine.tick(delta);

    performRender();
  }

  @override
  void dispose() {
    gameLoop.dispose();
    focusNode.dispose();
    super.dispose();
  }

  void performRender();
  Widget buildViewport(BuildContext context);
  Color get scaffoldColor;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: scaffoldColor,
      body: KeyboardListener(
        focusNode: focusNode,
        autofocus: true,
        onKeyEvent: (_) {},
        child: Center(
          child: buildViewport(context),
        ),
      ),
    );
  }
}