import 'dart:convert';
import 'dart:io';
import 'dart:typed_data';

import 'package:commons_core/commons_core.dart';
import 'package:drift/drift.dart' show Value;
import 'package:flutter/material.dart';
import 'package:flutter/services.dart' show FontLoader, rootBundle;
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_localizations/flutter_localizations.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:tane/app.dart' show materialLocaleFor;
import 'package:tane/data/species_repository.dart';
import 'package:tane/data/variety_repository.dart';
import 'package:tane/db/database.dart';
import 'package:tane/db/enums.dart';
import 'package:tane/domain/crop_calendar.dart' show monthsToMask;
import 'package:tane/i18n/strings.g.dart';
import 'package:tane/state/inventory_cubit.dart';
import 'package:tane/ui/theme.dart';

/// Marketing screenshot canvas: a tall phone at 3x. Logical 360x760.
const screenshotSize = Size(1080, 2280);
const screenshotPixelRatio = 3.0;

/// Locales we render real, translated screenshots for. Asturian (`ast`) is
/// omitted from store assets; the RTL demo is handled separately (the app has
/// no Arabic strings yet — see [ScreenshotLocale.rtlDemo]).
const screenshotLocales = <AppLocale>[
  AppLocale.en,
  AppLocale.es,
  AppLocale.fr,
  AppLocale.de,
  AppLocale.pt,
  AppLocale.ja,
];

bool _fontsLoaded = false;

/// Registers real glyph-bearing fonts so golden screenshots show text and icons
/// rather than the Ahem/tofu boxes flutter_test uses by default. Loads every
/// family declared in the test bundle's FontManifest.json (MaterialIcons, the
/// bundled Noto Sans JP/Arabic and seedks glyphs), then adds DejaVu Sans — a
/// bundled asset, not a font *family* — as the Latin text face so en/es/fr/de/pt
/// render legibly without needing Roboto.
Future<void> loadScreenshotFonts() async {
  if (_fontsLoaded) return;

  Future<void> family(String name, List<String> assets) async {
    final loader = FontLoader(name);
    for (final asset in assets) {
      loader.addFont(rootBundle.load(asset));
    }
    await loader.load();
  }

  final manifest =
      json.decode(await rootBundle.loadString('FontManifest.json'))
          as List<dynamic>;
  for (final entry in manifest.cast<Map<String, dynamic>>()) {
    await family(
      entry['family'] as String,
      [for (final f in entry['fonts'] as List) f['asset'] as String],
    );
  }

  await family('DejaVu Sans', [
    'assets/fonts/DejaVuSans.ttf',
    'assets/fonts/DejaVuSans-Bold.ttf',
  ]);
  _fontsLoaded = true;
}

const _fontFallbacks = <String>['Noto Sans JP', 'Noto Sans Arabic'];

/// The real app theme, but with every text style pinned to the bundled
/// [DejaVu Sans] so screenshots render legible glyphs (see [loadScreenshotFonts]).
ThemeData screenshotTheme() {
  final base = buildTaneTheme();
  return base.copyWith(
    textTheme: base.textTheme.apply(
      fontFamily: 'DejaVu Sans',
      fontFamilyFallback: _fontFallbacks,
    ),
    primaryTextTheme: base.primaryTextTheme.apply(
      fontFamily: 'DejaVu Sans',
      fontFamilyFallback: _fontFallbacks,
    ),
    appBarTheme: base.appBarTheme.copyWith(
      titleTextStyle: base.appBarTheme.titleTextStyle?.copyWith(
        fontFamily: 'DejaVu Sans',
        fontFamilyFallback: _fontFallbacks,
      ),
    ),
  );
}

/// Wraps [child] as a full screen for capture: the real green theme with
/// screenshot fonts, the given [locale], repositories and an [InventoryCubit].
/// Pass [textDirection] to force RTL for the layout demo.
Widget screenshotApp({
  required VarietyRepository repository,
  required SpeciesRepository species,
  required Widget child,
  AppLocale locale = AppLocale.en,
  TextDirection? textDirection,
}) {
  LocaleSettings.setLocaleSync(locale);
  return TranslationProvider(
    child: MultiRepositoryProvider(
      providers: [
        RepositoryProvider.value(value: repository),
        RepositoryProvider.value(value: species),
      ],
      child: BlocProvider(
        create: (_) => InventoryCubit(repository),
        child: MaterialApp(
          debugShowCheckedModeBanner: false,
          theme: screenshotTheme(),
          locale: materialLocaleFor(locale.flutterLocale),
          supportedLocales: AppLocaleUtils.supportedLocales,
          localizationsDelegates: const [
            GlobalMaterialLocalizations.delegate,
            GlobalWidgetsLocalizations.delegate,
            GlobalCupertinoLocalizations.delegate,
          ],
          home: textDirection == null
              ? child
              : Directionality(textDirection: textDirection, child: child),
        ),
      ),
    ),
  );
}

/// One seeded variety plus the id of a "hero" variety used for the detail shot.
class SeededInventory {
  const SeededInventory(this.heroVarietyId);
  final String heroVarietyId;
}

/// Seeds an attractive, internationally-neutral inventory: a spread of
/// colour-coded botanical families, lots with years/quantities/origins, photo
/// avatars, and crop-calendar month masks so the calendar screen is populated.
/// Returns the hero variety (a cherry tomato with several lots) for detail.
Future<SeededInventory> seedShowcase(
  AppDatabase db,
  VarietyRepository repo,
) async {
  // Sow in spring, harvest seed in late summer — visible in the calendar.
  final sow = monthsToMask(const [3, 4, 5]);
  final harvest = monthsToMask(const [8, 9]);

  // Most varieties use the app's default coloured-initial disc avatar; the hero
  // (maize) carries a real photo (below).
  Future<String> add(String label, String family, {Uint8List? photo}) async {
    final id = await repo.addQuickVariety(
      label: label,
      category: family,
      photoBytes: photo,
    );
    await (db.update(db.varieties)..where((v) => v.id.equals(id))).write(
      VarietiesCompanion(
        sowMonths: Value(sow),
        seedHarvestMonths: Value(harvest),
      ),
    );
    return id;
  }

  // Example photos are CC0 / public domain (see fixtures/CREDITS.md), except the
  // maize which is vjrj's own; loaded from the committed fixtures (CWD is the
  // package root under `flutter test`). The maize is the hero for the detail shot.
  Future<Uint8List> photo(String name) =>
      File('test/screenshots/fixtures/$name.jpg').readAsBytes();

  final maize = await add(
    'Painted flint corn',
    'Poaceae',
    photo: await photo('maize'),
  );
  await repo.addLot(
    varietyId: maize,
    harvestYear: 2024,
    quantity: const Quantity(kind: QuantityKind.cob, count: 6),
    originName: 'Community seed swap',
    abundance: Abundance.plentyToShare,
    offerStatus: OfferStatus.shared,
  );
  await repo.addLot(
    varietyId: maize,
    harvestYear: 2023,
    quantity: const Quantity(kind: QuantityKind.packet, count: 1),
    offerStatus: OfferStatus.exchange,
  );

  // The rest sit in families that sort at/after Poaceae, so the maize stays the
  // first, top-of-list group in the inventory shot. Each carries a CC0/PD photo.
  await add('Common buckwheat', 'Polygonaceae', photo: await photo('buckwheat'));
  await add('Wild raspberry', 'Rosaceae', photo: await photo('raspberry'));
  await add('Slicing tomato', 'Solanaceae', photo: await photo('tomato'));
  await add('Guajillo chilli', 'Solanaceae', photo: await photo('pepper'));

  return SeededInventory(maize);
}