const HTML_MIME = 'text/html'
const WHITESPACE = /\s+/
const EMPTY_DOCUMENT = '<p></p>'
const BLOCK_END = /<\/(?:p|h[1-6]|li|blockquote|pre|div)>|<br\s*\/?>/gi

export const LARGE_BODY_CHARACTERS = 50000

export function isLargeBody(characters: number) {
	return characters >= LARGE_BODY_CHARACTERS
}

export type BodyCounts = { words: number; characters: number }

export function bodyCounts(html: string): BodyCounts {
	if (html.length === 0 || html === EMPTY_DOCUMENT) {
		return { words: 0, characters: 0 }
	}
	const text =
		new DOMParser().parseFromString(html.replace(BLOCK_END, '$& '), HTML_MIME).body
			.textContent ?? ''
	const words = text.split(WHITESPACE).filter(Boolean).length
	return { words, characters: html.length }
}