interface BookMention {
  title: string;
  author?: string;
  confidence: number;
  postUri: string;
  postAuthor: string;
  postText: string;
  timestamp: string;
}

interface EnrichedBook {
  id: string;
  title: string;
  author?: string;
  coverUrl?: string;
  description?: string;
  publishYear?: number;
  pageCount?: number;
  subjects?: string[];
  openLibraryUrl?: string;
  isbn?: string;
  bookshopUrl?: string;
  mentionCount: number;
  firstMentionedAt: string;
  lastMentionedAt: string;
  isActive: boolean;
  reviewNotes?: string;
}

export function validatePotentialTitle(
  title: string,
  fullText: string,
  pattern: RegExp
): ValidationResult {
  // Basic validation
  if (title.length < 5 || title.length > 100) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title length outside valid range"
    };
  }

  // Skip if title doesn't start with a capital letter (unless in quotes)
  if (
    !/^[A-Z]/.test(title) &&
    !pattern.toString().includes('"') &&
    !pattern.toString().includes("'")
  ) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title does not start with capital letter"
    };
  }

  // Skip if title contains too many numbers (likely not a book)
  if ((title.match(/\d/g) || []).length > 3) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title contains too many numbers"
    };
  }

  const titleLower = title.toLowerCase();

  // Check for grammar fragments that indicate not a title
  if (GRAMMAR_FRAGMENTS.some((pattern) => pattern.test(title))) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title contains grammar pattern indicating it's not a book title"
    };
  }

  // Skip common news sources
  if (COMMON_NEWS_SOURCES.some((source) => titleLower.includes(source))) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title contains news source name"
    };
  }

  // Skip titles with multiple news indicator words
  const newsWordCount = NEWS_INDICATOR_WORDS.filter((word) =>
    titleLower.includes(word)
  ).length;

  if (newsWordCount >= 2) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title contains multiple news indicator words"
    };
  }

  // Skip titles with multiple spam indicator words
  const spamWordCount = SPAM_INDICATOR_WORDS.filter((word) =>
    titleLower.includes(word)
  ).length;

  if (spamWordCount >= 2) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title contains multiple spam indicator words"
    };
  }

  // Check for false positive phrases
  if (FALSE_POSITIVE_PHRASES.some((phrase) => titleLower.startsWith(phrase))) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title starts with a common false positive phrase"
    };
  }

  // Check if the post contains patterns suggesting it's not actually about books
  if (UNRELATED_CONTENT_PATTERNS.some((pattern) => pattern.test(fullText))) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Post contains language suggesting it's not about a book"
    };
  }

  // Skip if this looks like a subreddit/forum post format
  if (/subreddit:|Title:|URL:|Author:/i.test(fullText)) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Text has subreddit/forum post format"
    };
  }

  // Skip titles that are just a few words without proper structure
  const words = title.split(/\s+/);
  if (words.length < 2) {
    return {
      isValid: false,
      confidence: 0,
      reason: "Title is too short (fewer than 2 words)"
    };
  }

  // If title starts with common sentence starter and has no special formatting, likely not a book
  if (
    COMMON_SENTENCE_STARTERS.includes(words[0].toLowerCase()) &&
    !pattern.toString().includes('"') &&
    !pattern.toString().includes("'") &&
    !pattern.toString().includes("book") &&
    !pattern.toString().includes("read")
  ) {
    return {
      isValid: true,
      confidence: 0.3, // Low confidence, might still be a book but needs more signals
      reason: "Title starts with common sentence starter"
    };
  }

  // If we got here, title passes basic validation
  return { isValid: true, confidence: 0.5 };
}

Connected to Bluesky firehose
🚫 Rejecting "my book" - Title does not start with capital letter
📕 Detected book: "t think I" (0.90)
📚 Added new book: "I Didn't Think I Could" (OL26834543W)
📕 Detected book: "Biggest Fans" (0.80)
📚 Added new book: "Biggest Fan" (OL39185109W)
📕 Detected book: "COVID Vaccine Costs Just Spiked for Millions Thanks to RFK Jr." (0.80)
📕 Detected book: "COVID Vaccine Costs Just Spiked for Millions Thanks to RFK Jr." (0.95)
📕 No Open Library data found for: "COVID Vaccine Costs Just Spiked for Millions Thanks to RFK Jr." (confidence: 0.80)
🔍 No metadata found for book mention: "COVID Vaccine Costs Just Spiked for Millions Thanks to RFK Jr." (0.80)
📕 No Open Library data found for: "COVID Vaccine Costs Just Spiked for Millions Thanks to RFK Jr." (confidence: 0.95)
🔍 No metadata found for book mention: "COVID Vaccine Costs Just Spiked for Millions Thanks to RFK Jr." (0.95)
📕 Detected book: "New spaces of emotions?  Locating crypto-Platonism for quantitative geographies" (0.90)
📕 No Open Library data found for: "New spaces of emotions?  Locating crypto-Platonism for quantitative geographies" (confidence: 0.90)
🔍 No metadata found for book mention: "New spaces of emotions?  Locating crypto-Platonism for quantitative geographies" (0.90)