import { nextTick, ref, type Ref } from 'vue'
import { t } from '@/i18n'
import { useLocalizedToast } from '@/i18n/presentation'
import { useArticleActions } from '@/composables/useArticleActions'
import type { Article, ArticleCounts } from '@/composables/useArticles'
import type { ArticleListQuery } from '@/lib/articleListQuery'
import { pageCountFor } from '@/lib/pagination'

interface ArticleRowActionsState {
	items: Ref<Article[]>
	total: Ref<number>
	counts: Ref<ArticleCounts>
	shown: Ref<ArticleListQuery>
	reload: (query: ArticleListQuery, mode: 'push' | 'replace') => void
}

export function useArticleRowActions({
	items,
	total,
	counts,
	shown,
	reload,
}: ArticleRowActionsState) {
	const actions = useArticleActions()
	const toast = useLocalizedToast()
	const busyIds = ref<Set<number>>(new Set())

	function setBusy(id: number, busy: boolean) {
		const next = new Set(busyIds.value)
		if (busy) {
			next.add(id)
		} else {
			next.delete(id)
		}
		busyIds.value = next
	}

	function shiftCounts(article: Article, delta: number) {
		const key = article.is_online ? 'online' : 'draft'
		counts.value = {
			...counts.value,
			all: Math.max(0, counts.value.all + delta),
			[key]: Math.max(0, counts.value[key] + delta),
		}
	}

	function detachRow(id: number) {
		if (!items.value.some((article) => article.id === id)) {
			return
		}
		items.value = items.value.filter((article) => article.id !== id)
		total.value = Math.max(0, total.value - 1)
		if (items.value.length === 0 && total.value > 0) {
			const page = Math.min(shown.value.page, pageCountFor(total.value, shown.value.size))
			reload({ ...shown.value, page }, 'replace')
		}
	}

	function removeArticle(article: Article) {
		shiftCounts(article, -1)
		detachRow(article.id)
	}

	function replaceArticle(updated: Article, previous: Article) {
		items.value = items.value.map((existing) =>
			existing.id === updated.id ? updated : existing,
		)
		if (updated.is_online === previous.is_online) {
			return
		}
		counts.value = {
			...counts.value,
			online: counts.value.online + (updated.is_online ? 1 : -1),
			draft: counts.value.draft + (updated.is_online ? -1 : 1),
		}
		const filter = shown.value.status
		if (filter && (filter === 'online') !== updated.is_online) {
			detachRow(updated.id)
		}
	}

	function notFoundToast(article: Article) {
		return {
			id: `article-not-found-${article.id}`,
			color: 'info' as const,
			icon: 'i-lucide-info',
			get title() {
				return t('That article no longer exists')
			},
			get description() {
				return t('It was deleted somewhere else, so we removed it from the list.')
			},
		}
	}

	async function setOnline(article: Article, makeOnline: boolean) {
		setBusy(article.id, true)
		try {
			await actions.publish(article, makeOnline, {
				onUpdated: (updated) => replaceArticle(updated, article),
				onGone: () => goneFromList(article),
				retry: () => setOnline(article, makeOnline),
			})
		} finally {
			setBusy(article.id, false)
		}
	}

	function findItem(id: number) {
		return items.value.find((existing) => existing.id === id)
	}

	function handlePublish(id: number) {
		const article = findItem(id)
		if (article) {
			setOnline(article, true)
		}
	}

	function handleUnpublish(id: number) {
		const article = findItem(id)
		if (article) {
			setOnline(article, false)
		}
	}

	async function handleCopyUrl(id: number) {
		const article = findItem(id)
		if (!article) {
			return
		}
		const url = `${window.location.origin}/v1/article/${id}`
		try {
			await navigator.clipboard.writeText(url)
			toast.add(() => ({
				id: `article-link-copied-${id}`,
				color: 'success',
				icon: 'i-lucide-circle-check',
				get title() {
					return t('Link copied')
				},
				get description() {
					return t('The API URL for \u0022{0}\u0022 is on your clipboard.', [
						article.title,
					])
				},
			}))
		} catch {
			toast.add(() => ({
				id: `article-link-copy-failed-${id}`,
				color: 'error',
				icon: 'i-lucide-circle-x',
				get title() {
					return t("Couldn't copy the link")
				},
			}))
		}
	}

	function goneFromList(article: Article) {
		removeArticle(article)
		toast.add(() => notFoundToast(article))
	}

	function performDelete(article: Article) {
		return actions.deleteArticle(article, {
			onDeleted: () => removeArticle(article),
			onGone: () => goneFromList(article),
		})
	}

	async function focusRowOrHeading(idsAtOpen: number[], deletedId: number) {
		await nextTick()
		const index = idsAtOpen.indexOf(deletedId)
		const nextId = idsAtOpen[index + 1] ?? idsAtOpen.slice(0, index).reverse()[0]
		if (nextId != null) {
			document.querySelector<HTMLElement>(`[data-row-title="${nextId}"]`)?.focus()
			return
		}
		document.querySelector<HTMLElement>('[data-testid="articles-heading"]')?.focus()
	}

	async function handleDelete(article: Article) {
		const idsAtOpen = items.value.map((existing) => existing.id)
		const confirmed = await actions.confirmDelete(article, () => performDelete(article))
		if (confirmed) {
			focusRowOrHeading(idsAtOpen, article.id)
		}
	}

	return { busyIds, handlePublish, handleUnpublish, handleCopyUrl, handleDelete }
}