[LLC, UI-KIT] Add support for custom attachment upload delegate

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat_flutter/lib/src/utils.dart

@@ -214,18 +214,70 @@ String getWebsiteName(String hostName) {
   }
 }
 
-///
-String getSizeText(int bytes) {
-  if (bytes == null) {
-    return 'Size N/A';
+/// A method returns a human readable string representing a file _size
+String filesize(dynamic size, [int round = 2]) {
+  if (size == null) return 'Size N/A';
+
+  /**
+   * [size] can be passed as number or as string
+   *
+   * the optional parameter [round] specifies the number
+   * of digits after comma/point (default is 2)
+   */
+  final divider = 1024;
+  int _size;
+  try {
+    _size = int.parse(size.toString());
+  } catch (e) {
+    throw ArgumentError('Can not parse the size parameter: $e');
   }
 
-  if (bytes <= 1000) {
-    return '$bytes bytes';
-  } else if (bytes <= 100000) {
-    return '${(bytes / 1000).toStringAsFixed(2)} KB';
+  if (_size < divider) {
+    return '$_size B';
+  }
+
+  if (_size < divider * divider && _size % divider == 0) {
+    return '${(_size / divider).toStringAsFixed(0)} KB';
+  }
+
+  if (_size < divider * divider) {
+    return '${(_size / divider).toStringAsFixed(round)} KB';
+  }
+
+  if (_size < divider * divider * divider && _size % divider == 0) {
+    return '${(_size / (divider * divider)).toStringAsFixed(0)} MB';
+  }
+
+  if (_size < divider * divider * divider) {
+    return '${(_size / divider / divider).toStringAsFixed(round)} MB';
+  }
+
+  if (_size < divider * divider * divider * divider && _size % divider == 0) {
+    return '${(_size / (divider * divider * divider)).toStringAsFixed(0)} GB';
+  }
+
+  if (_size < divider * divider * divider * divider) {
+    return '${(_size / divider / divider / divider).toStringAsFixed(round)} GB';
+  }
+
+  if (_size < divider * divider * divider * divider * divider &&
+      _size % divider == 0) {
+    num r = _size / divider / divider / divider / divider;
+    return '${r.toStringAsFixed(0)} TB';
+  }
+
+  if (_size < divider * divider * divider * divider * divider) {
+    num r = _size / divider / divider / divider / divider;
+    return '${r.toStringAsFixed(round)} TB';
+  }
+
+  if (_size < divider * divider * divider * divider * divider * divider &&
+      _size % divider == 0) {
+    num r = _size / divider / divider / divider / divider / divider;
+    return '${r.toStringAsFixed(0)} PB';
   } else {
-    return '${(bytes / 1000000).toStringAsFixed(2)} MB';
+    num r = _size / divider / divider / divider / divider / divider;
+    return '${r.toStringAsFixed(round)} PB';
   }
 }