import '../source.dart';
import 'constants.dart';

/// Hot ranking period for `/hot` feeds.
enum MangaTownHotPeriod {
  total,
  today,
  week,
  month,
}

String? hotPeriodQuery(MangaTownHotPeriod period) {
  switch (period) {
    case MangaTownHotPeriod.total:
      return null;
    case MangaTownHotPeriod.today:
      return 'tviews.za';
    case MangaTownHotPeriod.week:
      return 'wviews.za';
    case MangaTownHotPeriod.month:
      return 'mviews.za';
  }
}

MangaTownHotPeriod? hotPeriodForMenu(CatalogMenuKind kind) {
  switch (kind) {
    case CatalogMenuKind.popular:
      return MangaTownHotPeriod.total;
    case CatalogMenuKind.hotToday:
      return MangaTownHotPeriod.today;
    case CatalogMenuKind.hotWeek:
      return MangaTownHotPeriod.week;
    case CatalogMenuKind.hotMonth:
      return MangaTownHotPeriod.month;
    default:
      return null;
  }
}

/// Page 1 uses the bare path; page 2+ appends `/{n}.html`.
String _pagedPath(String path, int page) {
  final base = path.replaceAll(RegExp(r'/+$'), '');
  if (page <= 1) return base;
  return '$base/$page.html';
}

Uri _withOptionalQuery(String path, String? queryToken) {
  final uri = Uri.parse('$mangaTownOrigin$path');
  if (queryToken == null || queryToken.isEmpty) return uri;
  // Site uses bare tokens like `?wviews.za` (no `=` value).
  return Uri.parse('${uri.toString()}?$queryToken');
}

String catalogLatestUrl({int page = 1}) {
  return _withOptionalQuery(_pagedPath('/latest', page), null).toString();
}

String catalogHotUrl({
  MangaTownHotPeriod period = MangaTownHotPeriod.total,
  int page = 1,
}) {
  return _withOptionalQuery(
    _pagedPath('/hot', page),
    hotPeriodQuery(period),
  ).toString();
}

/// `/directory/{demographic}-{genre}-0-{status}-{initial}-0`
String directoryUrl(
  CatalogBrowseParams browse, {
  int page = 1,
}) {
  final demo = _seg(browse.demographic);
  final genre = _seg(browse.genre);
  final status = _seg(browse.status);
  final initial = _seg(browse.initial);
  final path = _pagedPath(
    '/directory/$demo-$genre-0-$status-$initial-0',
    page,
  );
  return '$mangaTownOrigin$path';
}

String catalogSearchUrl({required String query, int page = 1}) {
  final path = _pagedPath('/search', page);
  return Uri.parse('$mangaTownOrigin$path').replace(
    queryParameters: {'name': query},
  ).toString();
}

String _seg(String raw) {
  final t = raw.trim();
  if (t.isEmpty) return '0';
  return t;
}

String mangaSlugFromUrl(String pageUrl) {
  try {
    final parts =
        Uri.parse(pageUrl).pathSegments.where((s) => s.isNotEmpty).toList();
    final mi = parts.indexOf('manga');
    if (mi != -1 && mi + 1 < parts.length) {
      return parts[mi + 1];
    }
  } catch (_) {}
  return 'comic';
}

String listingUrlForSlug(String slug, {String origin = mangaTownOrigin}) {
  final base = origin.replaceAll(RegExp(r'/+$'), '');
  return '$base/manga/$slug';
}

String mangaBaseUrlFromListingUrl(String pageUrl) {
  final u = Uri.parse(pageUrl);
  final parts = u.pathSegments.where((s) => s.isNotEmpty).toList();
  final mi = parts.indexOf('manga');
  if (mi == -1 || mi + 1 >= parts.length) {
    throw StateError(
      'Could not find /manga/{slug}/ in URL; use a manga or chapter link from MangaTown.',
    );
  }
  final slug = parts[mi + 1];
  return Uri(scheme: u.scheme, host: u.host, path: '/manga/$slug').toString();
}

/// Strip reader page suffixes like `/2.html` so we keep `/manga/{slug}/c005/`.
String chapterBaseUrl(String chapterUrl) {
  final u = Uri.parse(chapterUrl);
  final parts = u.pathSegments.where((s) => s.isNotEmpty).toList();
  if (parts.isEmpty) return chapterUrl;
  final last = parts.last;
  if (RegExp(r'^\d+\.html$', caseSensitive: false).hasMatch(last)) {
    parts.removeLast();
  }
  final path = '/${parts.join('/')}/';
  return Uri(scheme: u.scheme, host: u.host, path: path).toString();
}

/// 1-based reader page URL under a chapter base.
String chapterPageUrl(String chapterBase, int pageIndex) {
  final base = chapterBaseUrl(chapterBase);
  if (pageIndex <= 1) return base;
  final trimmed = base.replaceAll(RegExp(r'/+$'), '');
  return '$trimmed/$pageIndex.html';
}

String chapterKeyFromUrl(String chapterUrl) {
  try {
    final segs = Uri.parse(chapterBaseUrl(chapterUrl))
        .pathSegments
        .where((s) => s.isNotEmpty)
        .toList();
    return segs.isEmpty ? 'chapter' : segs.last;
  } catch (_) {
    return 'chapter';
  }
}

String? chapterNumberFromTitle(String title) {
  final cleaned = title.trim().replaceAll(RegExp(r'\s+'), ' ');
  final m = RegExp(
    r'(?:Chapter|Ch\.?|C\.?)\s*([\d.]+)',
    caseSensitive: false,
  ).firstMatch(cleaned);
  return m?.group(1);
}

String absoluteUrl(String href, String baseHref) {
  final resolved = Uri.parse(baseHref).resolve(href.trim()).toString();
  if (resolved.startsWith('//')) {
    return 'https:$resolved';
  }
  return resolved;
}

/// Demographics offered by MangaTown directory filters.
const mangaTownDemographics = <MapEntry<String, String>>[
  MapEntry('0', 'All'),
  MapEntry('josei', 'Josei'),
  MapEntry('seinen', 'Seinen'),
  MapEntry('shoujo', 'Shoujo'),
  MapEntry('shoujo_ai', 'Shoujo Ai'),
  MapEntry('shounen', 'Shounen'),
  MapEntry('shounen_ai', 'Shounen Ai'),
  MapEntry('yaoi', 'Yaoi'),
  MapEntry('yuri', 'Yuri'),
];

/// Genre slug → label for directory filters.
const mangaTownGenres = <MapEntry<String, String>>[
  MapEntry('0', 'All'),
  MapEntry('4_koma', '4 Koma'),
  MapEntry('action', 'Action'),
  MapEntry('adventure', 'Adventure'),
  MapEntry('comedy', 'Comedy'),
  MapEntry('cooking', 'Cooking'),
  MapEntry('doujinshi', 'Doujinshi'),
  MapEntry('drama', 'Drama'),
  MapEntry('ecchi', 'Ecchi'),
  MapEntry('fantasy', 'Fantasy'),
  MapEntry('gender_bender', 'Gender Bender'),
  MapEntry('harem', 'Harem'),
  MapEntry('historical', 'Historical'),
  MapEntry('horror', 'Horror'),
  MapEntry('martial_arts', 'Martial Arts'),
  MapEntry('mature', 'Mature'),
  MapEntry('mecha', 'Mecha'),
  MapEntry('music', 'Music'),
  MapEntry('mystery', 'Mystery'),
  MapEntry('one_shot', 'One Shot'),
  MapEntry('psychological', 'Psychological'),
  MapEntry('reverse_harem', 'Reverse Harem'),
  MapEntry('romance', 'Romance'),
  MapEntry('school_life', 'School Life'),
  MapEntry('sci_fi', 'Sci Fi'),
  MapEntry('shotacon', 'Shotacon'),
  MapEntry('slice_of_life', 'Slice Of Life'),
  MapEntry('smut', 'Smut'),
  MapEntry('sports', 'Sports'),
  MapEntry('supernatural', 'Supernatural'),
  MapEntry('suspense', 'Suspense'),
  MapEntry('tragedy', 'Tragedy'),
  MapEntry('vampire', 'Vampire'),
  MapEntry('webtoons', 'Webtoons'),
  MapEntry('youkai', 'Youkai'),
];

const mangaTownStatuses = <MapEntry<String, String>>[
  MapEntry('0', 'All'),
  MapEntry('ongoing', 'Ongoing'),
  MapEntry('new', 'New'),
  MapEntry('completed', 'Completed'),
];

/// A–Z plus `0-9`.
List<MapEntry<String, String>> mangaTownInitials() {
  final out = <MapEntry<String, String>>[const MapEntry('0', 'All')];
  for (var c = 0; c < 26; c++) {
    final letter = String.fromCharCode('a'.codeUnitAt(0) + c);
    out.add(MapEntry(letter, letter.toUpperCase()));
  }
  out.add(const MapEntry('0-9', '0-9'));
  return out;
}