const HTML_MIME = 'text/html'
const BLOCK_SELECTOR = 'p, h1, h2, h3, h4, h5, h6, li, blockquote, pre'
const BLANK_LINE = '\n\n'

export function bodyPlainText(html: string) {
	const document = new DOMParser().parseFromString(html, HTML_MIME)
	const blocks = Array.from(document.body.querySelectorAll(BLOCK_SELECTOR))
		.filter((block) => !block.querySelector(BLOCK_SELECTOR))
		.map((block) => (block.textContent ?? '').trim())
		.filter((text) => text !== '')
	return blocks.length > 0 ? blocks.join(BLANK_LINE) : (document.body.textContent ?? '').trim()
}

export function conflictDownloadText(title: string, html: string) {
	return `${title}${BLANK_LINE}${bodyPlainText(html)}\n`
}