Adds flight,battery models and image file managment

lib/images_manager.dart

@@ -0,0 +1,79 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:image_picker/image_picker.dart';
+import 'package:logging/logging.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:path/path.dart' as path;
+import 'package:uuid/uuid.dart';
+import 'package:image/image.dart' as img;
+import 'package:uuid/v5.dart';
+
+class ImagesManager 
+{
+    static final ImagesManager instance = ImagesManager._internal();
+    ImagesManager._internal();
+
+    static final Logger log = Logger("ImagesManager");
+
+    static Uri? _imagesDirectory;
+
+    Future<Uri> get imageDirectory async
+    {
+        if(_imagesDirectory != null) return _imagesDirectory!;
+        await _initImagesDirectory();
+        return _imagesDirectory!;
+    }
+
+    Future _initImagesDirectory() async
+    {
+        final directoryLoc = await getApplicationDocumentsDirectory();
+        final directoryName = "images";
+        final directoryPath = path.join(directoryLoc.path, directoryName);
+        final directoryUri = Uri.directory(directoryPath);
+        final directory = Directory.fromUri(directoryUri);
+        
+        if(!await directory.exists())
+        {
+            log.info("Image directory does not yet extists. Creating it.");
+        }
+
+        directory.create(recursive: false);
+        
+        log.info("Image directory set up at '$directory'");
+        
+        _imagesDirectory = directoryUri;
+    }
+
+    Future<String?> createImage(ImageSource source) async
+    {
+        // Get image from camera or not
+        final XFile? ximage = await ImagePicker().pickImage(source: source);
+        if(ximage == null) return null;
+
+        final uuid = Uuid().v6();
+        final imageDir = await imageDirectory;
+        ximage.saveTo(path.join(imageDir.path, uuid + path.extension(ximage.name)));
+        return uuid;
+    }
+
+    Future<Image?> loadImage(String imageUuid) async
+    {
+        final imageDir = await imageDirectory;
+        if(!Uuid.isValidUUID(fromString: imageUuid))
+        {
+            log.warning("Tried to load an image with an invalid UUID : '$imageUuid'.");
+            return null;
+        }
+
+        final imagePath = path.join(imageDir.path, "$imageUuid.jpg");
+        final file = File(imagePath);
+        if(!await file.exists())
+        {
+            log.warning("Tried to load an image that does not extist: '$imagePath'.");
+            return null;
+        }
+
+        return Image.file(file);
+    }
+}