init

lib/util/loco_info_util.dart

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+import 'dart:convert';
+import 'package:flutter/services.dart';
+
+class LocoInfoUtil {
+  static final List<LocoInfo> _locoData = [];
+  static bool _initialized = false;
+
+  static Future<void> initialize() async {
+    if (_initialized) return;
+
+    try {
+      final csvData = await rootBundle.loadString('assets/loco_info.csv');
+      final lines = csvData.split('\n');
+
+      for (final line in lines) {
+        if (line.trim().isEmpty) continue;
+
+        final fields = _parseCsvLine(line);
+        if (fields.length >= 4) {
+          try {
+            final model = fields[0];
+            final start = int.parse(fields[1]);
+            final end = int.parse(fields[2]);
+            final owner = fields[3];
+            final alias = fields.length > 4 ? fields[4] : '';
+            final manufacturer = fields.length > 5 ? fields[5] : '';
+
+            _locoData.add(LocoInfo(
+              model: model,
+              start: start,
+              end: end,
+              owner: owner,
+              alias: alias,
+              manufacturer: manufacturer,
+            ));
+          } catch (e) {}
+        }
+      }
+      _initialized = true;
+    } catch (e) {
+      _initialized = true;
+    }
+  }
+
+  static List<String> _parseCsvLine(String line) {
+    final fields = <String>[];
+    final buffer = StringBuffer();
+    bool inQuotes = false;
+
+    for (int i = 0; i < line.length; i++) {
+      final char = line[i];
+
+      if (char == '"') {
+        inQuotes = !inQuotes;
+      } else if (char == ',' && !inQuotes) {
+        fields.add(buffer.toString().trim());
+        buffer.clear();
+      } else {
+        buffer.write(char);
+      }
+    }
+
+    fields.add(buffer.toString().trim());
+    return fields;
+  }
+
+  static LocoInfo? findLocoInfo(String model, String number) {
+    if (!_initialized || model.isEmpty || number.isEmpty) {
+      return null;
+    }
+
+    try {
+      final cleanNumber = number.trim().replaceAll('-', '').replaceAll(' ', '');
+      final num = cleanNumber.length > 4
+          ? int.parse(cleanNumber.substring(cleanNumber.length - 4))
+          : int.parse(cleanNumber);
+
+      for (final info in _locoData) {
+        if (info.model == model && num >= info.start && num <= info.end) {
+          return info;
+        }
+      }
+    } catch (e) {
+      return null;
+    }
+
+    return null;
+  }
+
+  static String? getLocoInfoDisplay(String model, String number) {
+    if (_locoData.isEmpty) return null;
+
+    final modelTrimmed = model.trim();
+    final numberTrimmed = number.trim();
+
+    if (modelTrimmed.isEmpty ||
+        numberTrimmed.isEmpty ||
+        numberTrimmed == "<NUL>") {
+      return null;
+    }
+
+    final cleanNumber = numberTrimmed.replaceAll('-', '').replaceAll(' ', '');
+    final numberSuffix = cleanNumber.length >= 4
+        ? cleanNumber.substring(cleanNumber.length - 4)
+        : cleanNumber.padLeft(4, '0');
+
+    final numberInt = int.tryParse(numberSuffix);
+    if (numberInt == null) {
+      return null;
+    }
+
+    for (final info in _locoData) {
+      if (info.model == modelTrimmed &&
+          numberInt >= info.start &&
+          numberInt <= info.end) {
+        final buffer = StringBuffer();
+        buffer.write(info.owner);
+
+        if (info.alias.isNotEmpty) {
+          buffer.write(' - ${info.alias}');
+        }
+
+        if (info.manufacturer.isNotEmpty) {
+          buffer.write(' - ${info.manufacturer}');
+        }
+
+        return buffer.toString();
+      }
+    }
+    return null;
+  }
+}
+
+class LocoInfo {
+  final String model;
+  final int start;
+  final int end;
+  final String owner;
+  final String alias;
+  final String manufacturer;
+
+  LocoInfo({
+    required this.model,
+    required this.start,
+    required this.end,
+    required this.owner,
+    required this.alias,
+    required this.manufacturer,
+  });
+}