// 无头玩法测试：验证「输入 → World → 物理」链路真的在动（手感保真的核心）。
// 不依赖 widget 树，直接用固定步长推进，与游戏内 world.tick 完全一致。
import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:iwbtc/src/audio/sfx.dart' show Sfx;
import 'package:iwbtc/src/core/input.dart' show Input;
import 'package:iwbtc/src/core/save.dart' show Save;
import 'package:iwbtc/src/game/levels.dart' show loadLevels, LEVELS;
import 'package:iwbtc/src/game/world.dart' show GameHost, World;

class _Host implements GameHost {
  String screen = '';
  String toast = '';
  bool touchShown = false;
  @override
  void onBossBar(dynamic boss) {}
  @override
  void onHud(Map<String, dynamic> hud) {}
  @override
  void onPauseMenu(String label) {}
  @override
  void onResult(Map<String, dynamic> result) {}
  @override
  void onShowScreen(String s) => screen = s;
  @override
  void onToast(String text) => toast = text;
  @override
  void editorShow() {}
  @override
  void touchHide() => touchShown = false;
  @override
  void touchSetGun(bool has) {}
  @override
  void touchShow() => touchShown = true;
}

Future<World> _start() async {
  SharedPreferences.setMockInitialValues(<String, Object>{});
  await Save.load();
  await loadLevels();
  Input.clear();
  Sfx.enabled = false; // 测试环境没有音频插件，保持静音（Sfx 也不会因此报错）
  final world = World(_Host());
  world.startLevel(LEVELS.first, 0);
  return world;
}

/// 推进 n 个固定 60Hz 逻辑帧。
void _step(World w, int n) {
  for (int i = 0; i < n; i++) {
    w.tick(17);
  }
}

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();
  test('进入关卡后按方向键玩家会移动', () async {
    final world = await _start();
    expect(world.state, 'playing');
    expect(world.player, isNotNull);

    final double x0 = world.player!.x;
    Input.onKey('ArrowRight', true);
    _step(world, 15);
    Input.onKey('ArrowRight', false);

    expect(world.player!.x, greaterThan(x0), reason: '按住右键后玩家没有向右移动');
    // 水平速度与 web 版一致（HSPD = 2.6）
    expect(world.player!.vx, closeTo(2.6, 0.001));
  });

  test('跳跃初速与重力与 web 版一致（JUMP 6.6 / GRAV 0.25）', () async {
    final world = await _start();
    // 先落地，避免出生即空中导致二段跳语义不同
    _step(world, 30);
    final P = world.player!;
    Input.onKey('ShiftLeft', true);
    world.tick(17);
    world.tick(17);
    // 按住不放时持续受 GRAV = 0.25：-6.6 + 0.25 × 2
    expect(P.vy, closeTo(-6.6 + 0.5, 0.001), reason: '上升重力不符');
  });

  test('松键即停：可变跳跃高度（与 web 版一致）', () async {
    final world = await _start();
    _step(world, 30);
    final P = world.player!;
    Input.onKey('ShiftLeft', true);
    world.tick(17);
    // 中途松开：web 版 player.js 会把 vy 收紧到 -3，再叠加一帧重力 → -2.75
    Input.onKey('ShiftLeft', false);
    world.tick(17);
    expect(P.vy, closeTo(-3 + 0.25, 0.001), reason: '松键后的上升速度未按 -3 收紧');
  });

  test('死亡后不自动重生，按 R 才回存档点', () async {
    final world = await _start();
    final P = world.player!;
    P.kill();
    expect(P.dead, isTrue);
    final double deadX = P.x;

    Input.onKey('KeyR', false);
    _step(world, 30);
    expect(P.dead, isTrue, reason: '死亡后不应自动重生');
    expect(P.x, deadX, reason: '死亡后玩家应定格在死亡点');

    Input.onKey('KeyR', true);
    world.tick(17);
    Input.onKey('KeyR', false);
    world.tick(17);
    expect(P.dead, isFalse, reason: '按 R 后应重回存档点');
    expect(world.deaths, 1);
  });
}