import 'dart:convert';
import 'dart:typed_data';

import 'package:cloud_functions/cloud_functions.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

/// Ergebnis der KI-Krankheits-Diagnose (Cloud Function diagnosePlant).
class DiagnosisResult {
  const DiagnosisResult({
    required this.healthy,
    required this.matchesSpecies,
    required this.summary,
    required this.details,
    required this.treatment,
    required this.prevention,
  });

  final bool healthy;

  /// false, wenn das Foto laut KI eindeutig eine andere Pflanzenart zeigt
  /// als die im Profil hinterlegte (z. B. versehentlich falsches Foto).
  final bool matchesSpecies;

  final String summary;
  final String details;
  final String treatment;
  final String prevention;
}

class PlantDiagnosisService {
  PlantDiagnosisService(this._functionsGetter);

  // Lazy, damit Widget-Tests ohne initialisiertes Firebase auskommen —
  // FirebaseFunctions.instanceFor wirft sonst schon beim Erzeugen.
  final FirebaseFunctions Function() _functionsGetter;

  /// Schickt das Foto an die Cloud Function (Claude) – dauert einige Sekunden.
  /// [speciesHint] ist die bekannte Art der Pflanze und hilft der Diagnose.
  Future<DiagnosisResult> diagnose(
    Uint8List imageBytes, {
    String? speciesHint,
  }) async {
    final callable = _functionsGetter().httpsCallable('diagnosePlant');
    final response = await callable.call<Map<String, dynamic>>({
      'imageBase64': base64Encode(imageBytes),
      if (speciesHint != null && speciesHint.trim().isNotEmpty)
        'speciesHint': speciesHint.trim(),
    });
    final data = response.data;
    return DiagnosisResult(
      healthy: data['healthy'] as bool? ?? false,
      matchesSpecies: data['matchesSpecies'] as bool? ?? true,
      summary: data['summary'] as String? ?? '',
      details: data['details'] as String? ?? '',
      treatment: data['treatment'] as String? ?? '',
      prevention: data['prevention'] as String? ?? '',
    );
  }
}

final plantDiagnosisServiceProvider = Provider<PlantDiagnosisService>((ref) {
  return PlantDiagnosisService(
    () => FirebaseFunctions.instanceFor(region: 'europe-west3'),
  );
});