// Publisher-controlled Feed/Article storage limits (UTF-16 code units).
// Display metadata is truncated at these boundaries. Identity fields are never
// truncated: an overlong GUID is discarded and an overlong Article link is
// rejected so distinct resources cannot collapse onto the same stored prefix.
export const MAX_FEED_TITLE_SIZE = 1_000;
export const MAX_FEED_DESCRIPTION_SIZE = 20_000;
export const MAX_FEED_CATEGORY_SIZE = 512;
export const MAX_HTTP_URL_SIZE = 8_192;
export const MAX_ARTICLE_TITLE_SIZE = 2_000;
export const MAX_ARTICLE_GUID_SIZE = 4_096;
export const MAX_ARTICLE_LINK_SIZE = 8_192;
export const MAX_ARTICLE_AUTHOR_SIZE = 2_000;
export const MAX_ARTICLE_CATEGORY_SIZE = 512;
export const MAX_ARTICLE_CATEGORY_COUNT = 100;
// Aggregate category text, excluding JSON punctuation added at persistence.
export const MAX_ARTICLE_CATEGORIES_SIZE = 10_000;

// Feed-body complexity ceilings. These cap tree amplification independently of
// the 10 MB response-byte limit and are checked before xml2js builds an object.
export const MAX_FEED_XML_DEPTH = 256;
export const MAX_FEED_XML_NODES = 50_000;

// Article body limits
export const MAX_CONTENT_SIZE = 100_000;
// Feed summaries are useful as previews, but should not approach full-article size.
export const MAX_DESCRIPTION_SIZE = 20_000;
export const MAX_RESPONSE_SIZE = 10_000_000; // 10MB

// Fetch defaults
export const DEFAULT_TIMEOUT = 30_000;
export const DEFAULT_CONCURRENCY = 5;
export const DEFAULT_ARTICLE_LIMIT = 50;
export const MAX_ARTICLE_LIMIT = 1000;
export const MIN_CONCURRENCY = 1;
export const MAX_CONCURRENCY = 20;
export const RATE_LIMIT_MS = 1_000;
export const MIN_TIMEOUT = 1_000;
export const MAX_TIMEOUT = 600_000;
export const ARCHIVE_FETCH_TIMEOUT = 5_000;

// User agent
export const USER_AGENT = 'BunRSS-Reader/1.0 (compatible; RSS Reader)';

// Content extraction
export const CONTENT_SELECTORS = [
  'article',
  '[role="main"]',
  'main',
  '.post-content',
  '.article-content',
  '.entry-content',
  '.content',
  '#content',
];
export const MIN_CONTENT_LENGTH = 200;

// Display
export const MAX_DISPLAY_CONTENT_LENGTH = 2000;
export const MAX_TITLE_DISPLAY_LENGTH = 40;
export const ARTICLE_TITLE_DISPLAY_LENGTH = 50;
export const FEED_TITLE_IN_LIST_LENGTH = 20;
export const FEED_TITLE_IN_STATS_LENGTH = 30;

// OPML
export const MAX_OPML_RECURSION_DEPTH = 50;
export const MAX_OPML_OUTLINE_NODES = 10_000;

// Date parsing
export const MAX_RELATIVE_DAYS = 36_500; // ~100 years

// Error handling
export const MAX_ERROR_COUNT = 5; // Auto-deactivate feed after this many consecutive errors