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lib/features/operations/models/operation_file_model.dart

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+import 'dart:typed_data';
+
+import 'package:equatable/equatable.dart';
+
+class OperationFileModel extends Equatable {
+  final String? id;
+  final DateTime? createdAt;
+  final String name;
+  final String extension;
+  final String storagePath;
+  final String operationId;
+  final int fileSize;
+  final Uint8List? localBytes;
+
+  const OperationFileModel({
+    this.id,
+    this.createdAt,
+    required this.name,
+    required this.extension,
+    required this.storagePath,
+    required this.operationId,
+    required this.fileSize,
+    this.localBytes,
+  });
+
+  bool get isLocal => localBytes != null;
+
+  // Trasforma i byte in qualcosa di leggibile (KB, MB, GB)
+  String get sizeFormatted {
+    if (fileSize <= 0) return "0 B";
+    const suffixes = ["B", "KB", "MB", "GB", "TB"];
+    var i = (fileSize.toString().length - 1) ~/ 3;
+    if (i >= suffixes.length) i = suffixes.length - 1;
+    double num = fileSize / (1 << (i * 10));
+    return "${num.toStringAsFixed(i == 0 ? 0 : 1)} ${suffixes[i]}";
+  }
+
+  bool get isPdf => extension.toLowerCase().replaceAll('.', '') == 'pdf';
+
+  OperationFileModel copyWith({
+    String? id,
+    DateTime? createdAt,
+    String? name,
+    String? extension,
+    String? storagePath,
+    String? operationId,
+    int? fileSize,
+    Uint8List? localBytes,
+  }) {
+    return OperationFileModel(
+      id: id ?? this.id,
+      createdAt: createdAt ?? this.createdAt,
+      name: name ?? this.name,
+      extension: extension ?? this.extension,
+      storagePath: storagePath ?? this.storagePath,
+      operationId: operationId ?? this.operationId,
+      fileSize: fileSize ?? this.fileSize,
+      localBytes: localBytes ?? this.localBytes,
+    );
+  }
+
+  factory OperationFileModel.fromMap(Map<String, dynamic> map) {
+    return OperationFileModel(
+      id: map['id'] as String,
+      createdAt: map['created_at'] != null
+          ? DateTime.parse(map['created_at'])
+          : null,
+      name: map['name'] ?? '',
+      extension: map['extension'] ?? '',
+      storagePath: map['storage_path'] ?? '',
+      operationId: map['operation_id']?.toString() ?? '',
+      fileSize: map['file_size'] is int
+          ? map['file_size']
+          : int.tryParse(map['file_size']?.toString() ?? '0') ?? 0,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      if (id != null) 'id': id,
+      'name': name,
+      'extension': extension,
+      'storage_path': storagePath,
+      'operation_id': operationId,
+      'file_size': fileSize,
+    };
+  }
+
+  @override
+  List<Object?> get props => [
+    id,
+    createdAt,
+    name,
+    extension,
+    storagePath,
+    operationId,
+    fileSize,
+    localBytes,
+  ];
+}