import type { Article, ArticlePage, ArticleStatus } from '@/composables/useArticles'

export interface EnvelopeParams {
	page?: number
	size?: number
	q?: string
	status?: ArticleStatus | ''
	sort?: string
	site?: string
	seo?: '' | 'suggestions'
}

function fold(value: string) {
	return value.normalize('NFD').replace(/[̀-ͯ]/g, '').toLowerCase()
}

export function articleEnvelope(all: Article[], params: EnvelopeParams = {}): ArticlePage {
	const { page = 1, size = 25, q = '', status = '', sort = '', seo = '' } = params
	const filtered = all
		.filter(
			(article) =>
				!seo ||
				(article.seo_status === 'suggestions' && (article.seo_suggestions ?? 0) > 0),
		)
		.filter((article) => !status || article.is_online === (status === 'online'))
		.filter((article) => !q || fold(article.title).includes(fold(q)))
	if (sort) {
		const [name, direction] = sort.split(':') as [string, string]
		const field = (name === 'status' ? 'is_online' : name) as keyof Article
		filtered.sort((left, right) => {
			const order = String(left[field]).localeCompare(String(right[field]))
			return direction === 'desc' ? -order : order
		})
	}
	const online = all.filter((article) => article.is_online).length
	return {
		items: filtered.slice((page - 1) * size, page * size),
		total: filtered.length,
		page,
		size,
		counts: { all: all.length, online, draft: all.length - online },
	}
}

export function articleListUrl(params: EnvelopeParams = {}) {
	const { page = 1, size = 25, q = '', status = '', sort = '', site = '', seo = '' } = params
	const query = new URLSearchParams({
		format: 'html',
		page: String(page),
		size: String(size),
	})
	if (q) {
		query.set('q', q)
	}
	if (status) {
		query.set('status', status)
	}
	if (sort) {
		query.set('sort', sort)
	}
	if (site) {
		query.set('site', site)
	}
	if (seo) {
		query.set('seo', seo)
	}
	return `/v1/article/?${query.toString()}`
}

export function articleListRoute(params: EnvelopeParams = {}) {
	return `GET ${articleListUrl(params)}`
}

export function parseListUrl(url: string): EnvelopeParams {
	const query = new URL(url, 'http://localhost').searchParams
	return {
		page: Number(query.get('page')),
		size: Number(query.get('size')),
		q: query.get('q') ?? '',
		status: (query.get('status') ?? '') as ArticleStatus | '',
		sort: query.get('sort') ?? '',
		...(query.get('site') ? { site: query.get('site') ?? '' } : {}),
		...(query.get('seo') ? { seo: 'suggestions' as const } : {}),
	}
}