MotorSignal-App/lib/features/dashboard/widgets/lean_visualizer.dart

import 'dart:math' as math;
import 'package:flutter/material.dart';
import '../../rides/ride_state_machine.dart';

class LeanVisualizer extends StatelessWidget {
  final double? lean;
  final RideSession session;
  final bool isCalibrated;

  const LeanVisualizer({
    super.key,
    required this.lean,
    required this.session,
    this.isCalibrated = true,
  });

  @override
  Widget build(BuildContext context) {
    final effectiveLean = (isCalibrated && lean != null) ? lean! : 0.0;
    final isAvailable = isCalibrated && lean != null;
    final String angleText = isAvailable ? '${effectiveLean.abs().toStringAsFixed(0)}°' : '--°';
    final String directionText = isAvailable
        ? (effectiveLean > 1.0 ? 'RIGHT' : (effectiveLean < -1.0 ? 'LEFT' : 'UPRIGHT'))
        : 'UNCALIBRATED';

    return Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        const Text(
          'LEAN ANGLE',
          style: TextStyle(
            color: Colors.white54,
            fontSize: 11,
            fontWeight: FontWeight.w800,
            letterSpacing: 1.5,
          ),
        ),
        const SizedBox(height: 6),
        SizedBox(
          width: 110,
          height: 110,
          child: Stack(
            alignment: Alignment.center,
            children: [
              CustomPaint(
                size: const Size(110, 110),
                painter: _LeanDialPainter(leanAngle: effectiveLean),
              ),
              Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Text(
                    angleText,
                    style: const TextStyle(
                      fontSize: 26,
                      fontWeight: FontWeight.w900,
                      color: Colors.white,
                      fontFamily: 'JetBrains Mono',
                    ),
                  ),
                  Text(
                    directionText,
                    style: TextStyle(
                      fontSize: 10,
                      fontWeight: FontWeight.bold,
                      color: isAvailable && effectiveLean.abs() > 1.0
                          ? Theme.of(context).colorScheme.primary
                          : Colors.white38,
                    ),
                  ),
                ],
              ),
            ],
          ),
        ),
        const SizedBox(height: 6),
        FittedBox(
          fit: BoxFit.scaleDown,
          child: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                'L: ${session.maxLeanLeft.toStringAsFixed(0)}°',
                style: TextStyle(
                  color: Theme.of(context).colorScheme.secondary,
                  fontSize: 11,
                  fontWeight: FontWeight.w700,
                  fontFamily: 'JetBrains Mono',
                ),
              ),
              const SizedBox(width: 12),
              Text(
                'R: ${session.maxLeanRight.toStringAsFixed(0)}°',
                style: TextStyle(
                  color: Theme.of(context).colorScheme.secondary,
                  fontSize: 11,
                  fontWeight: FontWeight.w700,
                  fontFamily: 'JetBrains Mono',
                ),
              ),
            ],
          ),
        ),
      ],
    );
  }
}

class _LeanDialPainter extends CustomPainter {
  final double leanAngle;

  _LeanDialPainter({required this.leanAngle});

  @override
  void paint(Canvas canvas, Size size) {
    final center = Offset(size.width / 2, size.height / 2);
    final radius = size.width * 0.44;

    // Track arc
    final trackPaint = Paint()
      ..color = const Color(0xFF222222)
      ..style = PaintingStyle.stroke
      ..strokeWidth = 3.5
      ..strokeCap = StrokeCap.round;

    canvas.drawArc(
      Rect.fromCircle(center: center, radius: radius),
      math.pi,
      math.pi,
      false,
      trackPaint,
    );

    // Ticks
    final tickPaint = Paint()
      ..color = Colors.white24
      ..strokeWidth = 1.0;
    final centerTickPaint = Paint()
      ..color = Colors.white70
      ..strokeWidth = 1.5;

    for (final deg in [-60, -45, -30, -15, 0, 15, 30, 45, 60]) {
      final rad = (270 + deg) * (math.pi / 180.0);
      final isZero = deg == 0;
      final inner = radius - (isZero ? 5.0 : 3.0);
      final outer = radius + (isZero ? 3.0 : 1.5);
      final p1 = Offset(center.dx + inner * math.cos(rad), center.dy + inner * math.sin(rad));
      final p2 = Offset(center.dx + outer * math.cos(rad), center.dy + outer * math.sin(rad));
      canvas.drawLine(p1, p2, isZero ? centerTickPaint : tickPaint);
    }

    // Active sweep arc
    final clampedLean = leanAngle.clamp(-65.0, 65.0);
    if (clampedLean.abs() > 0.5) {
      final isExtreme = clampedLean.abs() > 45;
      final activeColor = isExtreme ? const Color(0xFFFF3D00) : const Color(0xFF00E5FF);

      final activeArcPaint = Paint()
        ..color = activeColor
        ..style = PaintingStyle.stroke
        ..strokeWidth = 4.0
        ..strokeCap = StrokeCap.round;

      final startRad = 270 * (math.pi / 180.0);
      final sweepRad = clampedLean * (math.pi / 180.0);

      canvas.drawArc(
        Rect.fromCircle(center: center, radius: radius),
        startRad,
        sweepRad,
        false,
        activeArcPaint,
      );
    }

    // Pointer needle on perimeter
    final angleRad = (270 + clampedLean) * (math.pi / 180);
    final innerNeedle = Offset(center.dx + (radius * 0.74) * math.cos(angleRad), center.dy + (radius * 0.74) * math.sin(angleRad));
    final outerNeedle = Offset(center.dx + (radius + 2.0) * math.cos(angleRad), center.dy + (radius + 2.0) * math.sin(angleRad));

    final needlePaint = Paint()
      ..color = const Color(0xFF00E5FF)
      ..strokeWidth = 2.5
      ..strokeCap = StrokeCap.round;
    canvas.drawLine(innerNeedle, outerNeedle, needlePaint);

    // Glowing tip dot
    canvas.drawCircle(outerNeedle, 3.0, Paint()..color = const Color(0xFF00E5FF));
  }

  @override
  bool shouldRepaint(covariant _LeanDialPainter oldDelegate) =>
      oldDelegate.leanAngle != leanAngle;
}