import 'dart:io';
import 'dart:math';
import 'package:firebase_core/firebase_core.dart' as firebase_core;
import 'package:http/http.dart' as http;
import 'package:image_picker/image_picker.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'dart:typed_data';


class ImageService {

  // Ladda upp en bild och returnera nedladdnings-URL eller null vid fel
  Future<String?> upload(XFile? image) async {
    if (image == null) {
      print('Ingen bild vald att ladda upp');
      return null;
    }

    File file = File(image.path);
    final String filename = image.name;

    /*
    För framtiden om det blir krockar med filnamn, använd uuid-funktionen
    Skapa ett unikt filnamn (med mappar) för att undvika krockar
    var uuid = Uuid();
     var uuidV4 = uuid.v4();
     */

    final String filenameUnique = 'media/$filename';
    final storage = FirebaseStorage.instance;
    final mediaRef = storage.ref().child(filenameUnique);

    try {
      // Ladda upp filen till Firebase Storage
      await mediaRef.putFile(file);

      // Hämta nedladdnings-URL
      String downloadUrl = await mediaRef.getDownloadURL();

      // Viktigt: Spara `filenameUnique` i din databas så du kan hitta filen senare!
      print('Bild uppladdad: $filenameUnique');
      print('Download URL: $downloadUrl');

      return downloadUrl;
    } on firebase_core.FirebaseException catch (e) {
      print('Misslyckades med att spara fil i Firebase Storage: ${e.code}');
      print(e.message);
      return null;
    }
  }

  // Future<bool> isDefaultGoogleAvatar(String? photoUrl) async {
  //   if (photoUrl == null || photoUrl.isEmpty) return true;
  //
  //   try {
  //     final response = await http.head(Uri.parse(photoUrl));
  //     final contentType = response.headers['content-type'];
  //     // print('Content type: ${contentType == 'image/png'}');
  //     return contentType == 'image/png'; // Defaults are PNG
  //   } catch (e) { // Fail safe: assume default if request fails
  //     return true;
  //   }
  // }

  /// SVG till firebase för att inte förstöra dicebear api
  /// Styles: https://www.dicebear.com/playground/
  /// "identicon" - Teams icons
  /// "rings" - Teams icons
  /// "avataaars-neutral" - User icons
  /// Go to url above and grab any style you want to use

  /// @Method
  /// Takes a Style and builds a url to a random seed icon for that style then uploads it to firebase and returns the firebase url
  Future<String> diceStyleToStorageUrl(String style) async {
    String seedIcon = await randomSeedIcon();
    String diceBearUrl = 'https://api.dicebear.com/9.x/$style/svg?Seed=$seedIcon';
    final svgData = await fetchSvg(diceBearUrl);
    final firebaseImageUrl = await uploadSvgDataToFirebase(svgData, 'avatars/$style/$seedIcon.svg');

    return firebaseImageUrl;
  }

  Future<String> fetchSvg(String url) async {
    final response = await http.get(Uri.parse(url));
    if (response.statusCode == 200) {
      return response.body;
    } else {
      throw Exception('Failed to load SVG');
    }
  }

  Future<String> uploadSvgDataToFirebase(String svgData, String storagePath) async {
    final storageRef = FirebaseStorage.instance.ref().child(storagePath);
    final svgBytes = Uint8List.fromList(svgData.codeUnits);
    final metadata = SettableMetadata(contentType: 'image/svg+xml');
    final uploadTask = await storageRef.putData(svgBytes, metadata);

    return uploadTask.ref.getDownloadURL();
  }

  Future<String> randomSeedIcon() async {
    final random = Random();
    return allSeedNames[random.nextInt(allSeedNames.length)];
  }

  /// Not actually all seed names.
  /// In playground some names dont exist but if there´s a "miss" you still get a random one.
  /// Better would be to take a style and use provided parameters to build a random icon based on that style but its more work
  final List<String> allSeedNames = [
    'Adrian', 'Aiden', 'Alexander', 'Amaya', 'Andrea', 'Avery', 'Brian', 'Chase', 'Christian', 'Christopher',
    'Destiny', 'Easton', 'Eden', 'Eliza', 'Emery', 'Jack', 'Jade', 'Jameson', 'Jessica', 'Jude', 'Kingston',
    'Leah', 'Leo', 'Liam', 'Liliana', 'Mackenzie', 'Maria', 'Mason', 'Oliver', 'Robert', 'Ryan', 'Ryker',
    'Sadie', 'Sara', 'Sarah', 'Sawyer', 'Sophia', 'Valentina', 'Vivian', 'Wyatt'
  ];

}