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

class ComicLandUrlParts {
  const ComicLandUrlParts({
    required this.origin,
    required this.slug,
    this.chapterIndex,
  });

  final String origin;
  final String slug;
  final String? chapterIndex;
}

bool isLikelyComicLandSite(String url) {
  try {
    final host = Uri.parse(url).host.toLowerCase();
    return comicLandHosts.contains(host) || host.contains('comicland');
  } catch (_) {
    return false;
  }
}

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

ComicLandUrlParts parseComicLandUrl(String pageUrl) {
  final u = Uri.parse(pageUrl);
  final parts = u.pathSegments.where((s) => s.isNotEmpty).toList();
  final comicIdx = parts.indexOf('comic');
  final slug =
      comicIdx != -1 && comicIdx + 1 < parts.length ? parts[comicIdx + 1] : 'comic';
  String? chapterIndex;
  final chapterIdx = parts.indexOf('chapter');
  if (chapterIdx != -1 && chapterIdx + 1 < parts.length) {
    chapterIndex = parts[chapterIdx + 1];
  }
  return ComicLandUrlParts(
    origin: '${u.scheme}://${u.host}',
    slug: slug,
    chapterIndex: chapterIndex,
  );
}

String chapterUrlFromParts(String siteOrigin, String slug, Object chapterIndex) {
  final origin = siteOrigin.replaceAll(RegExp(r'/+$'), '');
  return '$origin/comic/$slug/chapter/$chapterIndex';
}

String listingUrlForSlug(String slug) =>
    '${comicLandOrigin.replaceAll(RegExp(r'/+$'), '')}/comic/$slug';

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

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

String sanitizeFsStem(String stem) {
  final cleaned = stem
      .replaceAll(RegExp(r'[^a-z0-9._-]+', caseSensitive: false), '_')
      .replaceAll(RegExp(r'^_+|_+$'), '');
  if (cleaned.isEmpty) return 'chapter';
  return cleaned.length > 180 ? cleaned.substring(0, 180) : cleaned;
}

String sanitizeComicDirName(String name) {
  final collapsed = name.trim().replaceAll(RegExp(r'\s+'), ' ');
  final cleaned = String.fromCharCodes(
    collapsed.runes.where((code) {
      if (code < 32 || code == 127) return false;
      final ch = String.fromCharCode(code);
      return !RegExp(r'[<>:"/\\|?*]').hasMatch(ch);
    }),
  ).replaceAll(RegExp(r'\.+$'), '').trim();
  if (cleaned.isEmpty) return 'comic';
  return cleaned.length > 180 ? cleaned.substring(0, 180) : cleaned;
}

String stemForComicLandChapterCbz(String chapterPageUrl) {
  try {
    final segs =
        Uri.parse(chapterPageUrl).pathSegments.where((s) => s.isNotEmpty).toList();
    final comicIdx = segs.indexOf('comic');
    if (comicIdx != -1 &&
        segs.length >= comicIdx + 4 &&
        segs[comicIdx + 2] == 'chapter') {
      return '${segs[comicIdx + 1]}-chapter-${segs[comicIdx + 3]}';
    }
    if (segs.length >= 2) {
      return '${segs[segs.length - 2]}-${segs.last}';
    }
    return segs.isEmpty ? 'chapter' : segs.last;
  } catch (_) {
    return 'chapter';
  }
}

String transferLinkBasename(String? chapterNumber, String? label, String? cbzPath) {
  final candidates = [chapterNumber, label]
      .whereType<String>()
      .where((s) => s.trim().isNotEmpty);
  for (final raw in candidates) {
    final text = raw.trim();
    final m = RegExp(r'(\d+)((?:\.\d+)*)([a-zA-Z]*)').firstMatch(text);
    if (m != null) {
      final padded = m.group(1)!.padLeft(3, '0');
      return 'chapter $padded${m.group(2) ?? ''}${m.group(3) ?? ''}.cbz';
    }
  }
  if (cbzPath != null && cbzPath.isNotEmpty) {
    final base = cbzPath.split('/').last;
    if (base.isNotEmpty) return base;
  }
  return 'chapter unknown.cbz';
}

CatalogComic catalogFromJson(Map<String, dynamic> row) {
  final slug = (row['slug'] as String?)?.trim() ?? 'comic';
  return CatalogComic(
    source: SourceId.comicland,
    slug: slug,
    title: (row['title'] as String?)?.trim().isNotEmpty == true
        ? (row['title'] as String).trim()
        : slug,
    listingUrl: listingUrlForSlug(slug),
    coverUrl: row['cover_url'] as String?,
    description: row['description'] as String?,
    rating: (row['rating'] is num) ? (row['rating'] as num).toDouble() : null,
  );
}