// Renders the Peach app icon to assets/icon/ using Flutter's software
// rasterizer (full anti-aliasing, no external image tools needed).
//
//   flutter test test/tools/generate_icon_test.dart
//
// Then apply everywhere with:  dart run flutter_launcher_icons
import 'dart:io';
import 'dart:typed_data';
import 'dart:ui' as ui;

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

const _size = 1024.0;

// Brand gradient (matches PeachTheme.brandGradient / the splash tile).
const _g1 = Color(0xFFFF6A3D);
const _g2 = Color(0xFFE23C16);

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  test('generate app icon', () async {
    // Full-bleed source (square gradient, no alpha) — iOS-safe, universal.
    await _write('assets/icon/app_icon.png', await _render(_Mode.bleed));

    // Rounded-tile variant with transparent margin (macOS / marketing).
    await _write('assets/icon/app_icon_tile.png', await _render(_Mode.tile));

    // Android adaptive-icon foreground: rocket only, padded into the safe zone.
    await _write('assets/icon/app_icon_fg.png', await _render(_Mode.foreground));
  });
}

enum _Mode { bleed, tile, foreground }

Future<void> _write(String path, Uint8List bytes) async {
  final f = File(path);
  await f.create(recursive: true);
  await f.writeAsBytes(bytes);
  // ignore: avoid_print
  print('wrote $path (${bytes.length} bytes)');
}

Future<Uint8List> _render(_Mode mode) async {
  final recorder = ui.PictureRecorder();
  final canvas = Canvas(recorder);
  const rect = Rect.fromLTWH(0, 0, _size, _size);

  // ---- background tile ----
  final bg = Paint()
    ..shader = ui.Gradient.linear(
      const Offset(0, 0),
      const Offset(_size, _size),
      [_g1, _g2],
    );

  switch (mode) {
    case _Mode.bleed:
      canvas.drawRect(rect, bg);
      _sheen(canvas);
      break;
    case _Mode.tile:
      const margin = 96.0;
      final tileR = RRect.fromRectAndRadius(
        const Rect.fromLTWH(
            margin, margin, _size - 2 * margin, _size - 2 * margin),
        const Radius.circular(224),
      );
      canvas.drawRRect(tileR, bg);
      canvas.drawRRect(
        tileR.deflate(3),
        Paint()
          ..style = PaintingStyle.stroke
          ..strokeWidth = 3
          ..color = Colors.white.withValues(alpha: 0.16),
      );
      _sheen(canvas);
      break;
    case _Mode.foreground:
      // transparent background — foreground carries the mark only
      break;
  }

  // The mark: filled confidently. The adaptive foreground fills ~2/3 of the
  // frame (the launcher XML then adds a 16% safe-zone inset on top).
  final scale = mode == _Mode.foreground ? 1.15 : 1.14;
  canvas.save();
  canvas.translate(512, 524);
  canvas.scale(scale);
  canvas.translate(-512, -524);
  _drawRocket(canvas);
  canvas.restore();

  final pic = recorder.endRecording();
  final img = await pic.toImage(_size.toInt(), _size.toInt());
  final data = await img.toByteData(format: ui.ImageByteFormat.png);
  return data!.buffer.asUint8List();
}

/// Soft top-left highlight for depth.
void _sheen(Canvas canvas) {
  canvas.drawCircle(
    const Offset(300, 250),
    620,
    Paint()
      ..shader = ui.Gradient.radial(
        const Offset(300, 250),
        620,
        [Colors.white.withValues(alpha: 0.16), Colors.white.withValues(alpha: 0)],
      ),
  );
}

/// A clean, upright rocket — the Peach mark — in white with an accent window,
/// fins and an exhaust flame. Centered on the 1024 canvas.
void _drawRocket(Canvas canvas) {
  const cx = 512.0;

  // subtle drop shadow behind the whole mark
  canvas.save();
  canvas.translate(0, 16);
  _rocketBodyAndFins(canvas, Paint()
    ..color = Colors.black.withValues(alpha: 0.16)
    ..maskFilter = const MaskFilter.blur(BlurStyle.normal, 22));
  canvas.restore();

  // flame first (behind body base)
  final flame = Path()
    ..moveTo(cx, 828)
    ..cubicTo(cx - 62, 748, cx - 46, 712, cx - 30, 706)
    ..lineTo(cx + 30, 706)
    ..cubicTo(cx + 46, 712, cx + 62, 748, cx, 828)
    ..close();
  canvas.drawPath(
      flame,
      Paint()
        ..shader = ui.Gradient.linear(
          const Offset(cx, 700),
          const Offset(cx, 828),
          [const Color(0xFFFFD48A), const Color(0xFFF5A623)],
        ));
  // inner flame
  final flame2 = Path()
    ..moveTo(cx, 790)
    ..cubicTo(cx - 26, 742, cx - 20, 720, cx - 12, 716)
    ..lineTo(cx + 12, 716)
    ..cubicTo(cx + 20, 720, cx + 26, 742, cx, 790)
    ..close();
  canvas.drawPath(flame2, Paint()..color = Colors.white.withValues(alpha: 0.85));

  // white body + fins
  _rocketBodyAndFins(canvas, Paint()..color = Colors.white);

  // window (accent blue with a soft rim)
  canvas.drawCircle(const Offset(cx, 432), 70,
      Paint()..color = const Color(0xFF1F2937).withValues(alpha: 0.10));
  canvas.drawCircle(const Offset(cx, 430), 66,
      Paint()
        ..shader = ui.Gradient.linear(
          const Offset(cx - 60, 370),
          const Offset(cx + 60, 490),
          [const Color(0xFF5AA0FF), const Color(0xFF2F6FE0)],
        ));
  // window glint
  canvas.drawCircle(const Offset(cx - 20, 408), 18,
      Paint()..color = Colors.white.withValues(alpha: 0.55));
}

void _rocketBodyAndFins(Canvas canvas, Paint paint) {
  const cx = 512.0;

  // fins (drawn under the body edges)
  final rightFin = Path()
    ..moveTo(cx + 96, 556)
    ..lineTo(cx + 208, 712)
    ..lineTo(cx + 78, 676)
    ..close();
  final leftFin = Path()
    ..moveTo(cx - 96, 556)
    ..lineTo(cx - 208, 712)
    ..lineTo(cx - 78, 676)
    ..close();
  canvas.drawPath(rightFin, paint);
  canvas.drawPath(leftFin, paint);

  // body (symmetric capsule with a pointed nose)
  final body = Path()
    ..moveTo(cx, 244) // nose tip
    ..cubicTo(cx + 92, 300, cx + 116, 372, cx + 116, 452)
    ..cubicTo(cx + 116, 566, cx + 96, 646, cx + 60, 700)
    ..cubicTo(cx + 34, 714, cx - 34, 714, cx - 60, 700)
    ..cubicTo(cx - 96, 646, cx - 116, 566, cx - 116, 452)
    ..cubicTo(cx - 116, 372, cx - 92, 300, cx, 244)
    ..close();
  canvas.drawPath(body, paint);
}