import { DEMO_USER } from "@markone/core/user"
import type { LinkBookmark, BookmarkTag } from "@markone/core/bookmark"
import { type } from "arktype"
import { ulid } from "ulid"
import { db } from "~/database.ts"
import { HttpError } from "~/error.ts"
import type { User } from "~/user/user.ts"
import { JSDOM } from "jsdom"
import { Readability } from "@mozilla/readability"
import { findBookmarkHtml } from "./bookmark.ts"

const BOOKMARK_PAGINATION_LIMIT = 100

const ListUserBookmarksParams = type({
	limit: ["number", "=", BOOKMARK_PAGINATION_LIMIT],
	skip: ["number", "=", 0],
})

const AddBookmarkRequestBody = type({
	"title?": "string",
	kind: "string",
	url: "string",
	tags: "string[]",
	"force?": "boolean",
})

async function listUserBookmarks(request: Bun.BunRequest<"/api/bookmarks">, user: User) {
	const queryParams = ListUserBookmarksParams(request.params)
	if (queryParams instanceof type.errors) {
		throw new HttpError(400, "", queryParams.summary)
	}

	const listBookmarksQuery = db.query(
		`
SELECT bookmarks.id, bookmarks.kind, bookmarks.title, bookmarks.url FROM bookmarks
WHERE bookmarks.user_id = $userId
ORDER BY bookmarks.id DESC
LIMIT $limit OFFSET $skip
`,
	)

	const results = listBookmarksQuery.all({
		userId: user.id,
		limit: queryParams.limit,
		skip: queryParams.skip,
	})

	return Response.json(results, { status: 200 })
}

async function deleteUserBookmark(request: Bun.BunRequest<"/api/bookmark/:id">, user: User) {
	if (user.id !== DEMO_USER.id) {
		const deleteBookmarkQuery = db.query("DELETE FROM bookmarks WHERE user_id = $userId AND id = $id")
		const tx = db.transaction(() => {
			deleteBookmarkQuery.run({ userId: user.id, id: request.params.id })
		})
		tx()
	}
	return Response.json(undefined, { status: 204 })
}

async function addBookmark(request: Bun.BunRequest<"/api/bookmarks">, user: User) {
	if (user.id !== DEMO_USER.id) {
		const body = AddBookmarkRequestBody(await request.json())
		if (body instanceof type.errors) {
			throw new HttpError(400)
		}

		const websiteResponse = await fetch(body.url).catch(() => {
			if (body.force) {
				return null
			}
			throw new HttpError(400, "WebsiteUnreachable")
		})
		const websiteText = websiteResponse
			? await websiteResponse.text().catch(() => {
					throw new HttpError(400, "UnsupportedWebsite")
				})
			: null

		const bookmark: LinkBookmark = {
			kind: "link",
			id: ulid(),
			title: "",
			url: body.url,
			tags: body.tags.map((tag) => ({ id: ulid(), name: tag })),
		}

		if (body.title) {
			bookmark.title = body.title
		}

		let contentHtml: string
		if (websiteText) {
			const dom = new JSDOM(websiteText, {
				url: body.url,
			})
			const reader = new Readability(dom.window.document)
			const article = reader.parse()
			if (!bookmark.title) {
				bookmark.title = article?.title || "Untitled"
			}
			contentHtml = article?.content || ""
		} else {
			contentHtml = ""
			if (!bookmark.title) {
				bookmark.title = "Untitled"
			}
		}

		const query = db.query(`
INSERT INTO bookmarks (id, user_id, kind, title, url, content_html)
VALUES ($id, $userId, $kind, $title, $url, $html)
`)
		query.run({
			id: bookmark.id,
			userId: user.id,
			kind: bookmark.kind,
			title: bookmark.title,
			url: bookmark.url,
			html: contentHtml,
		})

		const insertTagQuery = db.query(`
INSERT INTO tags(id, bookmark_id, name)
VALUES ($id, $bookmarkId, $name)
`)
		const insertTags = db.transaction((tags: BookmarkTag[]) => {
			for (const tag of tags) {
				insertTagQuery.run({
					bookmarkId: bookmark.id,
					id: tag.id,
					name: tag.name,
				})
			}
		})

		insertTags(bookmark.tags)

		return Response.json(bookmark, { status: 200 })
	}

	return Response.json(undefined, { status: 204 })
}

async function fetchBookmark(request: Bun.BunRequest<"/api/bookmark/:id">, user: User) {
	switch (request.headers.get("Accept")) {
		case "text/html": {
			const html = findBookmarkHtml(request.params.id, user)
			if (html === null) {
				throw new HttpError(404)
			}
			return new Response(html, {
				status: 200,
				headers: {
					"Content-Type": "text/html",
				},
			})
		}
		default:
			throw new HttpError(400, "UnsupportedAcceptHeader")
	}
}

export { addBookmark, fetchBookmark, listUserBookmarks, deleteUserBookmark }