import 'package:aves/model/image_entry.dart';
import 'package:aves/model/image_metadata.dart';
import 'package:aves/services/service_policy.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';

class MetadataService {
  static const platform = MethodChannel('deckers.thibault/aves/metadata');

  // return Map<Map<Key, Value>> (map of directories, each directory being a map of metadata label and value description)
  static Future<Map> getAllMetadata(ImageEntry entry) async {
    if (entry.isSvg) return null;

    try {
      final result = await platform.invokeMethod('getAllMetadata', <String, dynamic>{
        'mimeType': entry.mimeType,
        'path': entry.path,
        'uri': entry.uri,
      });
      return result as Map;
    } on PlatformException catch (e) {
      debugPrint('getAllMetadata failed with code=${e.code}, exception=${e.message}, details=${e.details}');
    }
    return {};
  }

  static Future<CatalogMetadata> getCatalogMetadata(ImageEntry entry) async {
    if (entry.isSvg) return null;

    return servicePolicy.call(
      () async {
        try {
          // return map with:
          // 'dateMillis': date taken in milliseconds since Epoch (long)
          // 'isAnimated': animated gif/webp (bool)
          // 'latitude': latitude (double)
          // 'longitude': longitude (double)
          // 'videoRotation': video rotation degrees (int)
          // 'xmpSubjects': ';' separated XMP subjects (string)
          // 'xmpTitleDescription': XMP title or XMP description (string)
          final result = await platform.invokeMethod('getCatalogMetadata', <String, dynamic>{
            'mimeType': entry.mimeType,
            'path': entry.path,
            'uri': entry.uri,
          }) as Map;
          result['contentId'] = entry.contentId;
          return CatalogMetadata.fromMap(result);
        } on PlatformException catch (e) {
          debugPrint('getCatalogMetadata failed with code=${e.code}, exception=${e.message}, details=${e.details}');
        }
        return null;
      },
      priority: ServiceCallPriority.background,
      debugLabel: 'getCatalogMetadata-${entry.path}',
    );
  }

  static Future<OverlayMetadata> getOverlayMetadata(ImageEntry entry) async {
    if (entry.isSvg) return null;

    try {
      // return map with string descriptions for: 'aperture' 'exposureTime' 'focalLength' 'iso'
      final result = await platform.invokeMethod('getOverlayMetadata', <String, dynamic>{
        'mimeType': entry.mimeType,
        'path': entry.path,
        'uri': entry.uri,
      }) as Map;
      return OverlayMetadata.fromMap(result);
    } on PlatformException catch (e) {
      debugPrint('getOverlayMetadata failed with code=${e.code}, exception=${e.message}, details=${e.details}');
    }
    return null;
  }
}