import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:miler/views/helpers/constants/Colorconstants.dart';
import 'package:miler/views/helpers/constants/Font_constant.dart';

/// Mirrors `_calloutBitmap` in map.dart so the drawing maths can be checked
/// headless — the real one is private to a State inside a `part` file.
Future<({int w, int h})> callout(String text, double dpr) async {
  const double padH = 12, padV = 9, radius = 12, tail = 9, tailW = 14;
  const double maxTextWidth = 190;
  final painter = TextPainter(
    text: TextSpan(
      text: text,
      style: TextStyle(
        fontSize: 12 * dpr,
        height: 1.25,
        fontWeight: FontWeight.w700,
        color: ColorConstants.slateText,
        fontFamily: FontConstants.fontFamily,
      ),
    ),
    maxLines: 2,
    ellipsis: '…',
    textDirection: TextDirection.ltr,
  )..layout(maxWidth: maxTextWidth * dpr);

  final w = painter.width + padH * 2 * dpr;
  final h = painter.height + padV * 2 * dpr;
  final totalH = h + tail * dpr;

  final rec = ui.PictureRecorder();
  final canvas = Canvas(rec);
  final body = RRect.fromRectAndRadius(
    Rect.fromLTWH(0, 0, w, h),
    Radius.circular(radius * dpr),
  );
  canvas.drawRRect(
    body.shift(Offset(0, 1.5 * dpr)),
    Paint()
      ..color = Colors.black.withValues(alpha: 0.18)
      ..maskFilter = MaskFilter.blur(BlurStyle.normal, 3 * dpr),
  );
  canvas.drawRRect(body, Paint()..color = Colors.white);
  final tip = Path()
    ..moveTo(w / 2 - tailW / 2 * dpr, h - 1)
    ..lineTo(w / 2, totalH)
    ..lineTo(w / 2 + tailW / 2 * dpr, h - 1)
    ..close();
  canvas.drawPath(tip, Paint()..color = Colors.white);
  canvas.drawRRect(
    RRect.fromRectAndCorners(
      Rect.fromLTWH(0, 0, 4 * dpr, h),
      topLeft: Radius.circular(radius * dpr),
      bottomLeft: Radius.circular(radius * dpr),
    ),
    Paint()..color = ColorConstants.primary,
  );
  painter.paint(canvas, Offset(padH * dpr + 2 * dpr, padV * dpr));

  final img = await rec.endRecording().toImage(w.ceil(), totalH.ceil());
  final bytes = await img.toByteData(format: ui.ImageByteFormat.png);
  if (bytes == null) throw StateError('no png');
  return (w: img.width, h: img.height);
}

void main() {
  testWidgets('callout rasterises at every dpr', (tester) async {
    for (final dpr in [1.0, 2.0, 3.0]) {
      final r = await callout('18, Chinnavedampatti Road, Coimbatore', dpr);
      print('dpr=$dpr  ${r.w}x${r.h}px');
      expect(r.w, greaterThan(0));
      expect(r.h, greaterThan(0));
    }
    // A very long address must clamp, not grow without bound.
    final long = await callout(
      'Plot 42B, Second Cross Street, Behind Sri Ramakrishna Mills, '
      'Ganapathy Post, Coimbatore, Tamil Nadu 641006',
      3.0,
    );
    print('long address at dpr=3: ${long.w}x${long.h}px');
    expect(long.w, lessThanOrEqualTo((190 + 24) * 3 + 2));
  });
}