import 'dart:math' as math;

import 'package:flutter/material.dart';

import '../../core/app_colors.dart';

class DietPalette {
  DietPalette._();

  static const primary = Color(0xFF6476E8);
  static const primarySoft = Color(0xFFEEF0FF);
  static const protein = Color(0xFF38A77B);
  static const carbs = Color(0xFF4E91D8);
  static const fat = Color(0xFFE58A76);
  static const calorie = Color(0xFF6D6FEA);
  static const gradient = LinearGradient(
    begin: Alignment.topLeft,
    end: Alignment.bottomRight,
    colors: [Color(0xFF8FA7FF), primary],
  );
}

class DietCalorieRing extends StatelessWidget {
  final int calories;
  final double size;

  const DietCalorieRing({super.key, required this.calories, this.size = 116});

  @override
  Widget build(BuildContext context) {
    final progress = (calories / 800).clamp(0.04, 1.0);
    return Semantics(
      label: '总热量 $calories 千卡',
      child: SizedBox.square(
        dimension: size,
        child: CustomPaint(
          painter: _CalorieRingPainter(progress),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                '$calories',
                style: const TextStyle(
                  fontSize: 24,
                  fontWeight: FontWeight.w800,
                  color: AppColors.textPrimary,
                ),
              ),
              const Text(
                '千卡',
                style: TextStyle(
                  fontSize: 12,
                  fontWeight: FontWeight.w600,
                  color: AppColors.textHint,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class DietMacroBar extends StatelessWidget {
  final String label;
  final int value;
  final Color color;
  final double reference;

  const DietMacroBar({
    super.key,
    required this.label,
    required this.value,
    required this.color,
    required this.reference,
  });

  @override
  Widget build(BuildContext context) {
    final progress = (value / reference).clamp(0.0, 1.0);
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            Text(
              label,
              style: const TextStyle(
                fontSize: 14,
                fontWeight: FontWeight.w600,
                color: AppColors.textSecondary,
              ),
            ),
            const Spacer(),
            Text(
              '$value g',
              style: const TextStyle(
                fontSize: 15,
                fontWeight: FontWeight.w700,
                color: AppColors.textPrimary,
              ),
            ),
          ],
        ),
        const SizedBox(height: 6),
        ClipRRect(
          borderRadius: BorderRadius.circular(999),
          child: LinearProgressIndicator(
            minHeight: 5,
            value: progress,
            backgroundColor: color.withValues(alpha: 0.12),
            valueColor: AlwaysStoppedAnimation(color),
          ),
        ),
      ],
    );
  }
}

class _CalorieRingPainter extends CustomPainter {
  final double progress;

  const _CalorieRingPainter(this.progress);

  @override
  void paint(Canvas canvas, Size size) {
    final center = size.center(Offset.zero);
    final radius = size.shortestSide / 2 - 8;
    final track = Paint()
      ..color = DietPalette.primarySoft
      ..style = PaintingStyle.stroke
      ..strokeWidth = 9
      ..strokeCap = StrokeCap.round;
    final progressPaint = Paint()
      ..shader = const LinearGradient(
        colors: [Color(0xFF8FA7FF), DietPalette.calorie],
      ).createShader(Offset.zero & size)
      ..style = PaintingStyle.stroke
      ..strokeWidth = 9
      ..strokeCap = StrokeCap.round;

    canvas.drawCircle(center, radius, track);
    canvas.drawArc(
      Rect.fromCircle(center: center, radius: radius),
      -math.pi / 2,
      math.pi * 2 * progress,
      false,
      progressPaint,
    );
  }

  @override
  bool shouldRepaint(covariant _CalorieRingPainter oldDelegate) =>
      oldDelegate.progress != progress;
}