import 'dart:typed_data';

void main() {
  // Test with a map with 50,000 colors
  final Map<int, int> colorToCount = {
    for (var i = 0; i < 50000; i++) i: (i % 20),
  };
  print('Starting benchmark with ${colorToCount.length} items...');
  final swOld = Stopwatch()..start();
  for (var i = 0; i < 1000; i++) {
    // ignore: unused_local_variable
    final significantColors = Map<int, int>.from(colorToCount)
      ..removeWhere((key, value) => value < 10);
  }
  swOld.stop();
  print('Old Method (Map.from + removeWhere): ${swOld.elapsedMilliseconds}ms');
  final swNew = Stopwatch()..start();
  for (var i = 0; i < 1000; i++) {
    // ignore: unused_local_variable
    final significantColors = {
      for (final entry in colorToCount.entries)
        if (entry.value >= 10) entry.key: entry.value,
    };
  }
  swNew.stop();
  print('New Method (Collection for): ${swNew.elapsedMilliseconds}ms');
  
  if (swOld.elapsedMilliseconds > 0) {
    final double improvement = ((swOld.elapsedMilliseconds - swNew.elapsedMilliseconds) / swOld.elapsedMilliseconds) * 100;
    print('Efficiency Gain: ${improvement.toStringAsFixed(2)}%');
  }
  final oldResult = Map<int, int>.from(colorToCount)..removeWhere((k, v) => v < 10);
  final newResult = {
    for (final entry in colorToCount.entries)
      if (entry.value >= 10) entry.key: entry.value,
  };
  if (oldResult.length == newResult.length && 
      newResult.entries.every((e) => oldResult[e.key] == e.value)) {
    print('✅ Verification Passed: Logic is identical.');
  } else {
    print('❌ Verification Failed: Logic differs!');
  }
}