import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:speech_to_text/speech_to_text.dart';
import 'dart:async';
import '../../../core/theme/app_theme.dart';
import '../../../core/api/client.dart';
import '../../../core/api/endpoints.dart';
import '../../../core/constants/app_constants.dart';

enum VoiceState { idle, listening, processing, error }

class VoiceInputScreen extends ConsumerStatefulWidget {
  const VoiceInputScreen({super.key});

  @override
  ConsumerState<VoiceInputScreen> createState() => _VoiceInputScreenState();
}

class _VoiceInputScreenState extends ConsumerState<VoiceInputScreen>
    with SingleTickerProviderStateMixin {
  final SpeechToText _speech = SpeechToText();
  VoiceState _voiceState = VoiceState.idle;
  String _recognizedText = '';
  String? _errorMessage;
  bool _available = false;
  late AnimationController _animController;

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

  @override
  void dispose() {
    _animController.dispose();
    _speech.stop();
    super.dispose();
  }

  Future<void> _initSpeech() async {
    _available = await _speech.initialize(
      onError: (error) => setState(() {
        _voiceState = VoiceState.error;
        _errorMessage = error.errorMsg;
      }),
      onStatus: (status) {
        if (status == 'done' || status == 'notListening') {
          if (_voiceState == VoiceState.listening) {
            _stopListening();
          }
        }
      },
    );
    if (!_available && mounted) {
      setState(() {
        _errorMessage = 'Распознавание речи недоступно на этом устройстве';
      });
    }
  }

  Future<void> _startListening() async {
    if (!_available) return;
    setState(() {
      _voiceState = VoiceState.listening;
      _recognizedText = '';
      _errorMessage = null;
    });
    await _speech.listen(
      onResult: (result) {
        setState(() => _recognizedText = result.recognizedWords);
      },
      listenFor: const Duration(seconds: AppConstants.maxVoiceDurationSeconds),
      pauseFor: const Duration(seconds: 3),
      partialResults: true,
      localeId: 'ru_RU',
    );
  }

  Future<void> _stopListening() async {
    await _speech.stop();
    if (_recognizedText.isNotEmpty) {
      setState(() => _voiceState = VoiceState.processing);
      await _sendToServer();
    } else {
      setState(() => _voiceState = VoiceState.idle);
    }
  }

  Future<void> _sendToServer() async {
    try {
      final api = ref.read(apiClientProvider);
      final response = await api.post(
        Endpoints.voiceTranscribe,
        data: {'text': _recognizedText},
      );
      if (mounted) {
        setState(() {
          _voiceState = VoiceState.idle;
          if (response.data['response'] != null) {
            _recognizedText = response.data['response'] as String;
          }
        });
      }
    } catch (e) {
      if (mounted) {
        setState(() {
          _voiceState = VoiceState.error;
          _errorMessage = 'Ошибка отправки';
        });
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Голосовой ввод'),
        actions: [
          IconButton(
            icon: const Icon(Icons.history),
            onPressed: () => context.push('/voice/sessions'),
          ),
        ],
      ),
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(32),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              GestureDetector(
                onTap: _voiceState == VoiceState.listening
                    ? _stopListening
                    : _voiceState == VoiceState.idle
                        ? _startListening
                        : null,
                child: _PulseAnimation(
                  listenable: _animController,
                  builder: (context, child) {
                    final scale = _voiceState == VoiceState.listening
                        ? 1.0 + (_animController.value * 0.15)
                        : 1.0;
                    return Transform.scale(
                      scale: scale,
                      child: Container(
                        width: 120,
                        height: 120,
                        decoration: BoxDecoration(
                          shape: BoxShape.circle,
                          color: _voiceState == VoiceState.listening
                              ? VoIdeaColors.error.withOpacity(0.1)
                              : VoIdeaColors.primary.withOpacity(0.1),
                          border: Border.all(
                            color: _voiceState == VoiceState.listening
                                ? VoIdeaColors.error
                                : VoIdeaColors.primary,
                            width: 3,
                          ),
                        ),
                        child: Icon(
                          _voiceState == VoiceState.listening
                              ? Icons.mic
                              : _voiceState == VoiceState.processing
                                  ? Icons.hourglass_top
                                  : Icons.mic_none,
                          size: 48,
                          color: _voiceState == VoiceState.listening
                              ? VoIdeaColors.error
                              : VoIdeaColors.primary,
                        ),
                      ),
                    );
                  },
                ),
              ),
              const SizedBox(height: 32),
              Text(
                _voiceState == VoiceState.idle
                    ? 'Нажмите для начала записи'
                    : _voiceState == VoiceState.listening
                        ? 'Говорите...'
                        : _voiceState == VoiceState.processing
                            ? 'Обработка...'
                            : 'Ошибка',
                style: Theme.of(context).textTheme.titleMedium,
              ),
              const SizedBox(height: 24),
              if (_recognizedText.isNotEmpty)
                Container(
                  padding: const EdgeInsets.all(16),
                  decoration: BoxDecoration(
                    color: VoIdeaColors.surface,
                    borderRadius: BorderRadius.circular(12),
                  ),
                  child: Text(
                    _recognizedText,
                    style: Theme.of(context).textTheme.bodyLarge,
                    textAlign: TextAlign.center,
                  ),
                ),
              if (_errorMessage != null)
                Padding(
                  padding: const EdgeInsets.only(top: 16),
                  child: Text(
                    _errorMessage!,
                    style: const TextStyle(color: VoIdeaColors.error),
                    textAlign: TextAlign.center,
                  ),
                ),
            ],
          ),
        ),
      ),
    );
  }
}

class _PulseAnimation extends AnimatedWidget {
  final Widget Function(BuildContext context, Widget? child) builder;

  const _PulseAnimation({
    required super.listenable,
    required this.builder,
  });

  @override
  Widget build(BuildContext context) {
    return builder(context, null);
  }
}