// Headless store-screenshot generator. Renders the app's key screens to PNGs
// at both store device sizes, in English, with a real font loaded (the
// flutter_test default font draws every glyph as a box).
//
//   flutter test test/tool/generate_store_screenshots_test.dart
//
// Output: docs/store/screenshots/{ios,android}/*.png
import 'dart:convert';
import 'dart:io';
import 'dart:ui' as ui;

import 'package:block_seasons/core/rng.dart';
import 'package:block_seasons/data/save_repository.dart';
import 'package:block_seasons/game/engine/piece_generator.dart';
import 'package:block_seasons/game/models/season.dart';
import 'package:block_seasons/game/models/stage.dart';
import 'package:block_seasons/l10n/gen/app_localizations.dart';
import 'package:block_seasons/state/providers.dart';
import 'package:block_seasons/ui/screens/game_screen.dart';
import 'package:block_seasons/ui/screens/home_screen.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

typedef _Device = ({String dir, int pw, int ph, double dpr});

const _devices = <_Device>[
  (dir: 'ios', pw: 1290, ph: 2796, dpr: 3.0), // iPhone 6.7"
  (dir: 'android', pw: 1080, ph: 1920, dpr: 3.0), // Play phone
  (dir: 'ipad', pw: 2048, ph: 2732, dpr: 2.0), // iPad 12.9"/13"
];

// A lively mid-game board: three gems to clear plus scattered colored blocks.
final _playStage = StageConfig.fromJson({
  'id': 'shot_play',
  'seed': 777,
  'moveLimit': 20,
  'preset': [
    {'x': 3, 'y': 1, 't': 'gem'},
    {'x': 5, 'y': 3, 't': 'gem'},
    {'x': 2, 'y': 5, 't': 'gem'},
    {'x': 0, 'y': 7, 't': 'filled', 'c': 0},
    {'x': 1, 'y': 7, 't': 'filled', 'c': 3},
    {'x': 2, 'y': 7, 't': 'filled', 'c': 5},
    {'x': 3, 'y': 7, 't': 'filled', 'c': 2},
    {'x': 5, 'y': 7, 't': 'filled', 'c': 6},
    {'x': 6, 'y': 7, 't': 'filled', 'c': 1},
    {'x': 7, 'y': 7, 't': 'filled', 'c': 4},
    {'x': 0, 'y': 6, 't': 'filled', 'c': 3},
    {'x': 1, 'y': 6, 't': 'filled', 'c': 0},
    {'x': 6, 'y': 6, 't': 'filled', 'c': 4},
    {'x': 7, 'y': 6, 't': 'filled', 'c': 7},
    {'x': 0, 'y': 5, 't': 'filled', 'c': 5},
    {'x': 7, 'y': 5, 't': 'filled', 'c': 2},
    {'x': 5, 'y': 0, 't': 'filled', 'c': 3},
    {'x': 2, 'y': 2, 't': 'filled', 'c': 7},
  ],
  'objectives': [
    {'type': 'clearGems', 'count': 3},
  ],
  'stars': {
    'two': {'movesLeft': 5},
    'three': {'movesLeft': 10},
  },
  'generatorProfile': 'mid',
});

// A denser, higher-tension board for the third shot (score-chase objective so
// it stays mid-play rather than completing).
final _denseStage = StageConfig.fromJson({
  'id': 'shot_dense',
  'seed': 321,
  'moveLimit': 16,
  'preset': [
    {'x': 2, 'y': 1, 't': 'gem'},
    {'x': 6, 'y': 2, 't': 'gem'},
    {'x': 0, 'y': 3, 't': 'filled', 'c': 6},
    {'x': 1, 'y': 3, 't': 'filled', 'c': 6},
    {'x': 7, 'y': 3, 't': 'filled', 'c': 2},
    {'x': 0, 'y': 4, 't': 'filled', 'c': 1},
    {'x': 3, 'y': 4, 't': 'filled', 'c': 4},
    {'x': 4, 'y': 4, 't': 'filled', 'c': 4},
    {'x': 7, 'y': 4, 't': 'filled', 'c': 0},
    {'x': 0, 'y': 5, 't': 'filled', 'c': 3},
    {'x': 1, 'y': 5, 't': 'filled', 'c': 3},
    {'x': 2, 'y': 5, 't': 'filled', 'c': 5},
    {'x': 5, 'y': 5, 't': 'filled', 'c': 7},
    {'x': 6, 'y': 5, 't': 'filled', 'c': 1},
    {'x': 7, 'y': 5, 't': 'filled', 'c': 1},
    {'x': 0, 'y': 6, 't': 'filled', 'c': 2},
    {'x': 1, 'y': 6, 't': 'filled', 'c': 0},
    {'x': 2, 'y': 6, 't': 'filled', 'c': 0},
    {'x': 3, 'y': 6, 't': 'filled', 'c': 5},
    {'x': 5, 'y': 6, 't': 'filled', 'c': 6},
    {'x': 6, 'y': 6, 't': 'filled', 'c': 3},
    {'x': 0, 'y': 7, 't': 'filled', 'c': 4},
    {'x': 1, 'y': 7, 't': 'filled', 'c': 4},
    {'x': 2, 'y': 7, 't': 'filled', 'c': 2},
    {'x': 4, 'y': 7, 't': 'filled', 'c': 7},
    {'x': 5, 'y': 7, 't': 'filled', 'c': 7},
    {'x': 6, 'y': 7, 't': 'filled', 'c': 5},
    {'x': 7, 'y': 7, 't': 'filled', 'c': 0},
  ],
  'objectives': [
    {'type': 'reachScore', 'target': 6000},
  ],
  'stars': {
    'two': {'movesLeft': 4},
    'three': {'movesLeft': 8},
  },
  'generatorProfile': 'hard',
});

Future<void> _loadFont() async {
  final bytes =
      File('/System/Library/Fonts/Supplemental/Arial.ttf').readAsBytesSync();
  final loader = FontLoader('Arial')
    ..addFont(Future.value(ByteData.view(bytes.buffer)));
  await loader.load();
}

Widget _wrap(ProviderContainer c, Widget screen, GlobalKey key) =>
    UncontrolledProviderScope(
      container: c,
      child: RepaintBoundary(
        key: key,
        child: MaterialApp(
          debugShowCheckedModeBanner: false,
          locale: const Locale('en'),
          localizationsDelegates: AppLocalizations.localizationsDelegates,
          supportedLocales: AppLocalizations.supportedLocales,
          theme: ThemeData(
            fontFamily: 'Arial',
            colorScheme: ColorScheme.fromSeed(
              seedColor: const Color(0xFF5B7FFF),
              brightness: Brightness.dark,
            ),
            useMaterial3: true,
          ),
          home: screen,
        ),
      ),
    );

// Captures the boundary layer to a PNG at [dpr]x — the same OffsetLayer.toImage
// call the golden matcher makes, but scaled up for store-resolution output.
Future<void> _shoot(
    WidgetTester tester, GlobalKey key, String dir, String file, double dpr) async {
  var ro = key.currentContext!.findRenderObject()!;
  while (!ro.isRepaintBoundary) {
    ro = ro.parent!;
  }
  final layer = ro.debugLayer! as OffsetLayer;
  final bounds = ro.paintBounds;
  // Real-async raster work must run inside runAsync, or it corrupts the
  // binding's frame pipeline for the next pump.
  final bytes = await tester.runAsync(() async {
    final image = await layer.toImage(bounds, pixelRatio: dpr);
    final data = await image.toByteData(format: ui.ImageByteFormat.png);
    image.dispose();
    return data;
  });
  final f = File('docs/store/screenshots/$dir/$file')
    ..parent.createSync(recursive: true);
  f.writeAsBytesSync(bytes!.buffer.asUint8List());
}

/// The ambient season background animates forever, so pumpAndSettle would
/// hang. Pump a couple of fixed frames to let layout + intro fades land.
Future<void> _steady(WidgetTester tester) async {
  await tester.pump();
  await tester.pump(const Duration(milliseconds: 450));
}

void main() {
  testWidgets('generate store screenshots', (tester) async {
    await _loadFont();

    SharedPreferences.setMockInitialValues({});
    final repo = SaveRepository(await SharedPreferences.getInstance());
    await repo.recordEndlessScore(12480);
    await repo.markTutorialDone();
    final pack = SeasonPack.fromJson(jsonDecode(
            File('assets/seasons/season_001/pack.json').readAsStringSync())
        as Map<String, dynamic>);
    for (var i = 1; i <= 5; i++) {
      await repo.recordResult(
        seasonId: 'season_001',
        stageId: pack.stages[i - 1].id,
        stars: i.isEven ? 2 : 3,
        score: 1000 + i * 220,
      );
    }

    for (final d in _devices) {
      tester.view.devicePixelRatio = d.dpr;
      tester.view.physicalSize = Size(d.pw.toDouble(), d.ph.toDouble());
      addTearDown(tester.view.resetPhysicalSize);
      addTearDown(tester.view.resetDevicePixelRatio);

      // 1) Home
      {
        final key = GlobalKey();
        final c = ProviderContainer(
            overrides: [saveRepositoryProvider.overrideWithValue(repo)]);
        await tester.pumpWidget(_wrap(c, const HomeScreen(), key));
        await _steady(tester);
        await _shoot(tester, key, d.dir, '01_home.png', d.dpr);
        c.dispose();
      }

      // 3) Gameplay
      {
        final key = GlobalKey();
        final c = ProviderContainer(
            overrides: [saveRepositoryProvider.overrideWithValue(repo)]);
        c.read(gameSessionProvider.notifier).startStage(
              _playStage,
              generator: PieceGenerator(SeededRng(7)),
            );
        await tester.pumpWidget(_wrap(c, const GameScreen(), key));
        await _steady(tester);
        await _shoot(tester, key, d.dir, '02_play.png', d.dpr);
        c.dispose();
      }

      // 3b) A denser board (score chase)
      {
        final key = GlobalKey();
        final c = ProviderContainer(
            overrides: [saveRepositoryProvider.overrideWithValue(repo)]);
        c.read(gameSessionProvider.notifier).startStage(
              _denseStage,
              generator: PieceGenerator(SeededRng(13)),
            );
        await tester.pumpWidget(_wrap(c, const GameScreen(), key));
        await _steady(tester);
        await _shoot(tester, key, d.dir, '03_levels.png', d.dpr);
        c.dispose();
      }
    }

    for (final d in _devices) {
      for (final f in ['01_home', '02_play', '03_levels']) {
        expect(File('docs/store/screenshots/${d.dir}/$f.png').existsSync(),
            isTrue,
            reason: '${d.dir}/$f');
      }
    }
  });
}