import { t } from '@/i18n'
import type { DescriptionSource } from '@/lib/seoPreview'
import type { SeoSuggestion, SuggestionCode, SuggestionField } from '@/lib/seoTypes'

function descriptionLength(params: Record<string, number>) {
	return t('The description is {0} characters. About 70 to 160 reads best in results.', [
		params.length,
	])
}

const MESSAGES: Record<SuggestionCode, (params: Record<string, number>) => string> = {
	title_long: (params) =>
		t('The meta title is {0} characters. Search engines may cut it off after about {1}.', [
			params.length,
			params.max,
		]),
	title_empty: () => t('No meta title yet. The article title is used instead.'),
	desc_short: descriptionLength,
	desc_long: (params) =>
		t('The description is {0} characters. Search engines may cut it off after about {1}.', [
			params.length,
			params.max,
		]),
	cover_alt: () => t('The cover image has no alt text. Add a short description of it.'),
	cover_none: () => t("No cover image. The site's social image is used."),
	slug_long: (params) =>
		t('The slug is {0} characters. Shorter addresses are easier to share.', [params.length]),
	no_au: () => t('This article has no authors, so the structured data has no author.'),
	no_h: () => t('The body has no headings. H2 headings help readers scan the article.'),
	body_alt: (params) =>
		params.count === 1
			? t('1 image in the body has no alt text.')
			: t('{0} images in the body have no alt text.', [params.count]),
	short: () => t('The article is under 300 words. That is fine for a short note.'),
}

const LINK_LABELS: Record<SuggestionField, () => string> = {
	seo_title: () => t('Go to meta title'),
	seo_description: () => t('Go to meta description'),
	cover_image_alt: () => t('Go to cover image'),
	cover_image_id: () => t('Go to cover image'),
	slug: () => t('Go to URL slug'),
	author_ids: () => t('Go to authors'),
	body: () => t('Go to body'),
}

export function suggestionMessage(suggestion: SeoSuggestion) {
	const message = MESSAGES[suggestion.code]
	return message ? message(suggestion.params ?? {}) : suggestion.code
}

export function suggestionLinkLabel(field: SuggestionField) {
	const label = LINK_LABELS[field]
	return label ? label() : ''
}

const CHIPS = {
	article_title: () => t('Using article title'),
	body: () => t('Using first sentence of the body'),
	excerpt: () => t('Using the excerpt'),
	site_description: () => t('Using the site default description'),
	cover_image: () => t('Using cover image'),
	site_image: () => t('Using site social image'),
	no_image: () => t('No image'),
	canonical: () => t('Using site address and slug'),
	meta_title: () => t('Using meta title'),
	meta_description: () => t('Using meta description'),
}

export type ChipKey = keyof typeof CHIPS

export function chipLabel(key: ChipKey) {
	return CHIPS[key]()
}

export function descriptionChip(source: DescriptionSource | string) {
	const keys: Record<string, ChipKey> = {
		excerpt: 'excerpt',
		body: 'body',
		site: 'site_description',
	}
	const key = keys[source]
	return key ? chipLabel(key) : null
}