import 'package:flutter/foundation.dart';
import 'package:flutter_tts/flutter_tts.dart';

import 'spelling_tts_backend.dart';

SpellingTtsBackend createSpellingTtsBackend() => _FlutterTtsBackend();

class _FlutterTtsBackend implements SpellingTtsBackend {
  final FlutterTts _tts = FlutterTts();
  bool _configured = false;

  Future<void> _ensureConfigured() async {
    if (_configured) {
      return;
    }
    await _tts.setLanguage('en-US');
    await _tts.setSpeechRate(0.42);
    await _tts.setPitch(1.0);
    await _tts.awaitSpeakCompletion(true);
    _configured = true;
  }

  @override
  Future<void> speak(String text, {String? title}) async {
    final String trimmed = text.trim();
    if (trimmed.isEmpty) {
      return;
    }
    await _ensureConfigured();
    await _tts.stop();
    if (title != null && title.isNotEmpty) {
      debugPrint('Spelling TTS utterance title: $title');
    }
    await _tts.speak(trimmed);
  }

  @override
  Future<void> stop() async {
    try {
      await _tts.stop();
    } catch (_) {}
  }
}