/*
 * Copyright (c) 2024-2026 Fabian Freund.
 *
 * This file is part of WebLibre
 * (see https://weblibre.eu).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
import 'package:flutter/material.dart';

int _getLineCountUsingBoxes(String text, TextStyle style, double maxWidth) {
  final textSpan = TextSpan(text: text, style: style);

  final textPainter = TextPainter(
    text: textSpan,
    textDirection: TextDirection.ltr,
  );

  textPainter.layout(maxWidth: maxWidth);

  // Select all text
  final selection = TextSelection(baseOffset: 0, extentOffset: text.length);

  // Each box represents one line
  final lines = textPainter.getBoxesForSelection(selection);
  return lines.length;
}

int? getTextFieldLineCount(GlobalKey key, String text, TextStyle style) {
  final box = key.currentContext?.findRenderObject();
  if (box case final RenderBox box) {
    final width = box.size.width;

    return _getLineCountUsingBoxes(text, style, width);
  }

  return null;
}

double? getTextFieldHeight(GlobalKey key) {
  final box = key.currentContext?.findRenderObject();
  if (box case final RenderBox box) {
    return box.size.height;
  }

  return null;
}