import 'package:firebase_ai/firebase_ai.dart';

class GeminiService {
  static late GenerativeModel _model;

  /// Initializes Gemini Developer API
  static Future<void> initialize() async {
    _model = FirebaseAI.googleAI().generativeModel(
      model: 'gemini-2.5-flash',
    );
  }

  /// Generate text from a text prompt
  static Future<String> generateText(String prompt) async {
    try {
      final content = [Content.text(prompt)];

      final response = await _model.generateContent(content);

      return response.text ?? "No response text found.";
    } catch (e) {
      return "Error: $e";
    }
  }

  /// Stream text response (optional)
  static Stream<String> streamText(String prompt) async* {
    final content = [Content.text(prompt)];

    final stream = _model.generateContentStream(content);

    await for (final chunk in stream) {
      if (chunk.text != null) yield chunk.text!;
    }
  }
}