import 'package:flutter/material.dart';

extension TextExt on Text {
  /// Single-line width as rendered in [context] (honours the text scaler).
  /// Memoised: chat bubbles measure the same few names and times over and
  /// over, and every measurement is a full paragraph layout.
  double measuredWidth(BuildContext context) {
    final scaler = MediaQuery.textScalerOf(context);
    final key = (data, style, scaler);
    final cached = _widthCache[key];
    if (cached != null) return cached;
    final painter = TextPainter(
      text: TextSpan(text: data, style: style),
      maxLines: 1,
      textDirection: TextDirection.ltr,
      textScaler: scaler,
    )..layout();
    final width = painter.width;
    painter.dispose();
    if (_widthCache.length >= 512) _widthCache.clear();
    return _widthCache[key] = width;
  }
}

final Map<(String?, TextStyle?, TextScaler), double> _widthCache = {};

/// Returns the first non-empty (after trim) entry, or '' if none match.
String firstNonEmpty(List<String?> values) {
  for (final v in values) {
    if (v != null && v.trim().isNotEmpty) return v;
  }
  return '';
}