// Author: fruit.com.cn

import '../../../core/data/models/drama.dart';

const int homeNewReleaseDays = 7;
const int homeHotViewThreshold = 100000;
const int _snowflakeEpochMillis = 1288834974657;
const int _snowflakeTimestampShift = 22;

const Map<String, List<String>> _tagAliases = {
  'uplifting': ['爽剧', '逆袭', '复仇', 'revenge', 'balas'],
  'sweet': ['甜宠', '甜', 'sweet', 'romantis'],
  'faceSlap': ['打脸', '虐渣', 'comeuppance', 'comeback'],
  'angst': ['虐恋', '虐心', 'angst', 'heartbreak'],
};

DateTime? publishedAtForDrama(Drama drama) {
  if (drama.createdAt != null) return drama.createdAt;
  final snowflake = BigInt.tryParse(drama.id);
  if (snowflake == null) return null;
  final timestamp =
      (snowflake >> _snowflakeTimestampShift).toInt() + _snowflakeEpochMillis;
  final publishedAt = DateTime.fromMillisecondsSinceEpoch(timestamp);
  return publishedAt.year >= 2015 ? publishedAt : null;
}

bool isNewDrama(Drama drama, {DateTime? now}) {
  final publishedAt = publishedAtForDrama(drama);
  if (publishedAt == null) return false;
  final age = (now ?? DateTime.now()).difference(publishedAt);
  return !age.isNegative && age <= const Duration(days: homeNewReleaseDays);
}

bool isHotDrama(Drama drama) {
  return drama.isHot || drama.viewCount >= homeHotViewThreshold;
}

bool matchesHomeTag(Drama drama, String tagId) {
  if (tagId == 'hot') return isHotDrama(drama);
  return tagMatchesText(tagId, drama.genre) ||
      tagMatchesText(tagId, drama.category);
}

bool tagMatchesText(String tagId, String text) {
  if (tagId == 'hot') return false;
  final normalized = text.toLowerCase();
  final aliases = _tagAliases[tagId] ?? const [];
  return aliases.any(normalized.contains);
}