feature: Save logging to cache directory (#196)

Co-authored-by: PartyDonut <PartyDonut@users.noreply.github.com>

lib/models/error_log_model.dart

@@ -0,0 +1,90 @@
+import 'package:flutter/material.dart';
+
+import 'package:collection/collection.dart';
+import 'package:logging/logging.dart';
+
+enum ErrorType {
+  severe,
+  warning,
+  shout,
+}
+
+class ErrorLogModel {
+  final ErrorType type;
+  final String message;
+  final DateTime time;
+  final StackTrace? stackTrace;
+
+  const ErrorLogModel({
+    required this.type,
+    required this.message,
+    required this.time,
+    required this.stackTrace,
+  });
+
+  factory ErrorLogModel.fromLogRecord(LogRecord record) {
+    late ErrorType type;
+    if (record.level == Level.WARNING) {
+      type = ErrorType.warning;
+    } else if (record.level == Level.SHOUT) {
+      type = ErrorType.shout;
+    } else {
+      type = ErrorType.severe;
+    }
+
+    return ErrorLogModel(
+      type: type,
+      message: record.message,
+      time: record.time,
+      stackTrace: record.stackTrace,
+    );
+  }
+
+  String get label {
+    var join = _label;
+    if (join.length > 250) {
+      return "${join.substring(0, 250)}... \n \nTruncated copy log to see more";
+    } else {
+      return join;
+    }
+  }
+
+  String get _label {
+    return [
+      type.name.toUpperCase(),
+      "  |  ",
+      message,
+    ].join();
+  }
+
+  String get content => [
+        time.toIso8601String(),
+        "\n",
+        "\n",
+        stackTrace,
+      ].whereNotNull().join();
+
+  String get clipBoard => [_label, content].toString();
+
+  Color get color => switch (type) {
+        ErrorType.severe => Colors.redAccent,
+        ErrorType.warning => Colors.orange,
+        ErrorType.shout => Colors.yellowAccent,
+      };
+
+  Map<String, dynamic> toJson() => {
+        'time': time.toIso8601String(),
+        'level': type.name,
+        'message': message,
+        'stackTrace': stackTrace?.toString(),
+      };
+
+  static ErrorLogModel fromJson(Map<String, dynamic> json) {
+    return ErrorLogModel(
+      type: ErrorType.values.firstWhereOrNull((level) => level.name == json['level']) ?? ErrorType.warning,
+      message: json['message'],
+      stackTrace: json['stackTrace'] != null ? StackTrace.fromString(json['stackTrace']) : null,
+      time: DateTime.parse(json['time']),
+    );
+  }
+}