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

/// Définit un contrat pour tout service capable d'améliorer un texte.
abstract class TextImprovementService {
  Future<String> improveText({
    required String originalText,
    required String userInstruction,
  });
}

/// L'implémentation Ollama de ce service.
class OllamaTextImprovementService implements TextImprovementService {
  final String _apiUrl = 'http://192.168.20.200:11434/api/generate';
  final String _textModel = 'gpt-oss:20b';

  @override
  Future<String> improveText({
    required String originalText,
    required String userInstruction,
  }) async {
    print("[OllamaTextImprovementService] 🚀 Appel pour améliorer le texte...");
    final requestPrompt = """
  You are a social media writing assistant.
  A user wants to improve the following text:
  --- TEXT TO IMPROVE ---
  $originalText
  -----------------------

  The user's instruction is: "$userInstruction".

  Rewrite the text based on the instruction.
  Your output MUST be ONLY the improved text, without any extra commentary or explanations.
  """;

    final requestBody = {
      'model': _textModel,
      'prompt': requestPrompt,
      '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 responseData = jsonDecode(response.body);
        return (responseData['response'] as String? ?? '').trim();
      } else {
        throw Exception('Erreur Ollama (improveText) ${response.statusCode}: ${response.body}');
      }
    } catch (e) {
      print("[OllamaTextImprovementService] ❌ Exception : ${e.toString()}");
      rethrow;
    }
  }
}