import 'package:flutter/material.dart';

class ThinkingIndicator extends StatefulWidget {
  const ThinkingIndicator({super.key});

  @override
  State<ThinkingIndicator> createState() => _ThinkingIndicatorState();
}

class _ThinkingIndicatorState extends State<ThinkingIndicator>
    with SingleTickerProviderStateMixin {
  late AnimationController _controller;

  @override
  void initState() {
    super.initState();
    _controller = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 1500),
    )..repeat();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          AnimatedBuilder(
            animation: _controller,
            builder: (context, child) {
              return Row(
                children: List.generate(3, (index) {
                  final delay = index * 0.2;
                  final value = (_controller.value + delay) % 1.0;
                  final opacity = (value < 0.5 ? value * 2 : 2 - value * 2);
                  return Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 2),
                    child: Opacity(
                      opacity: 0.3 + opacity * 0.7,
                      child: Container(
                        width: 8,
                        height: 8,
                        decoration: BoxDecoration(
                          color: Colors.orange.shade400,
                          shape: BoxShape.circle,
                        ),
                      ),
                    ),
                  );
                }),
              );
            },
          ),
          const SizedBox(width: 8),
          Text(
            'Claude is thinking...',
            style: TextStyle(
              color: Colors.grey.shade400,
              fontSize: 14,
              fontStyle: FontStyle.italic,
            ),
          ),
        ],
      ),
    );
  }
}