import { t, locale } from '@/i18n'
import { formatAbsoluteDateFromIso } from '@/lib/relativeDate'
import type { ResolvedSeo } from '@/lib/seoTypes'

const MONTH_NAMES = [
	'Jan',
	'Feb',
	'Mar',
	'Apr',
	'May',
	'Jun',
	'Jul',
	'Aug',
	'Sep',
	'Oct',
	'Nov',
	'Dec',
]
const EMPTY_VALUE = '–'

export interface ApiPreviewRow {
	key: string
	value: string
	chip: string | null
}

function pad(value: number) {
	return value.toString().padStart(2, '0')
}

export function formatApiDate(iso: string | null) {
	if (!iso) {
		return EMPTY_VALUE
	}
	const date = new Date(iso)
	const clock = `${pad(date.getHours())}:${pad(date.getMinutes())}`
	return locale.value === 'fr'
		? `${formatAbsoluteDateFromIso(iso)}, ${clock}`
		: `${date.getDate()} ${MONTH_NAMES[date.getMonth()]} ${date.getFullYear()}, ${clock}`
}

const FALLBACK_CHIPS: Record<string, Record<string, () => string>> = {
	title: { title: () => t('article title + template') },
	description: {
		body: () => t('first sentence of the body'),
		excerpt: () => t('excerpt'),
		site: () => t('site default description'),
	},
	image: {
		cover: () => t('cover image'),
		site: () => t('site social image'),
		none: () => t('No image'),
	},
	canonical: { site: () => t('site address + slug') },
}

function fallbackChip(field: string, source: string) {
	return FALLBACK_CHIPS[field]?.[source]?.() ?? null
}

function authorLine(author: ResolvedSeo['authors'][number]) {
	const links = author.same_as.length
	return [
		author.name,
		author.url ? author.url.replace(/^https?:\/\//, '') : '',
		links === 0 ? '' : links === 1 ? t('1 social link') : t('{0} social links', [links]),
	]
		.filter(Boolean)
		.join(' · ')
}

function jsonLdSummary(jsonLd: Record<string, unknown>) {
	const fields = Object.keys(jsonLd).filter((key) => !key.startsWith('@'))
	return [String(jsonLd['@type'] ?? ''), fields.join(', ')].filter(Boolean).join(' · ')
}

export function apiPreviewRows(resolved: ResolvedSeo): ApiPreviewRow[] {
	const { fallbacks } = resolved
	return [
		{ key: 'title', value: resolved.title, chip: fallbackChip('title', fallbacks.title) },
		{
			key: 'description',
			value: resolved.description,
			chip: fallbackChip('description', fallbacks.description),
		},
		{
			key: 'canonical_url',
			value: resolved.canonical_url,
			chip: fallbackChip('canonical', fallbacks.canonical),
		},
		{ key: 'robots', value: resolved.robots, chip: null },
		{ key: 'og.type', value: resolved.og.type, chip: null },
		{ key: 'og.image', value: resolved.og.image, chip: fallbackChip('image', fallbacks.image) },
		{ key: 'og.image_alt', value: resolved.og.image_alt, chip: null },
		{ key: 'twitter.card', value: resolved.twitter.card, chip: null },
		{
			key: 'authors',
			value: resolved.authors.map(authorLine).join('; ') || EMPTY_VALUE,
			chip: null,
		},
		{ key: 'published_at', value: formatApiDate(resolved.published_at), chip: null },
		{ key: 'modified_at', value: formatApiDate(resolved.modified_at), chip: null },
		{ key: 'json_ld', value: jsonLdSummary(resolved.json_ld), chip: null },
	]
}