Socialmedia_Julien/lib/services/image_analysis_service.dart

import 'dart:convert';

import 'package:http/http.dart' as http;

/// Définit un contrat pour tout service capable d'analyser une image
/// et de la décrire sous forme de texte.
abstract class ImageAnalysisService {
  /// Prend une image en base64 et retourne une description textuelle (prompt).
  Future<String> analyzeImage(String base64Image);
}

/// L'implémentation Ollama de ce service.
class OllamaImageAnalysisService implements ImageAnalysisService {
  final String _apiUrl = 'http://192.168.20.200:11434/api/generate';
  final String _visionModel = 'llava:7b';

  @override
  Future<String> analyzeImage(String base64Image) async {
    print(
        "[OllamaImageAnalysisService] 🚀 Lancement de l'analyse de l'image...");
    final requestPrompt = '''
As a professional photographe and instagram, describe this imange and give ideas to improve quality to publish on social network.
''';

    final requestBody = {
      'model': _visionModel,
      'prompt': requestPrompt,
      'images': [base64Image],
      'stream': false,
    };

    try {
      final response = await http.post(
        Uri.parse(_apiUrl),
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode(requestBody),
      ).timeout(const Duration(minutes: 2));

      if (response.statusCode == 200) {
        final body = jsonDecode(response.body);
        final generatedPrompt = (body['response'] as String? ?? '')
            .trim()
            .replaceAll('\n', ' ');
        print(
            "[OllamaImageAnalysisService] ✅ Analyse terminée : $generatedPrompt");
        return generatedPrompt;
      } else {
        throw Exception(
            'Erreur Ollama (analyzeImage) ${response.statusCode}: ${response
                .body}');
      }
    } catch (e) {
      print("[OllamaImageAnalysisService] ❌ Exception : ${e.toString()}");
      rethrow;
    }
  }
}