import { writable } from "svelte/store"
import { fs_check_response, fs_path_url } from "./FilesystemAPI"
import { loading_finish, loading_start } from "lib/Loading"

const bookmarks_file = "/me/.fnx/bookmarks.json"

export type Bookmark = {
	id: string,
	icon: string,
	label: string,
}

export let bookmarks_store = writable<Bookmark[]>(
	[],
	(set: (value: Bookmark[]) => void) => {
		bookmarks_get().then((bm: Bookmark[]) => {
			set(bm)
		}).catch((err: any) => {
			alert("Could not fetch bookmarks:\n" + JSON.stringify(err))
		})
	},
)

export const bookmarks_get = async (): Promise<Bookmark[]> => {
	let bookmarks: Bookmark[] = []
	try {
		bookmarks = await fs_check_response(
			await fetch(fs_path_url(bookmarks_file), { cache: "no-store" })
		)
	} catch (err) {
		// If the bookmarks were not found when we return an empty bookmarks
		// list
		if (err.value !== "path_not_found") {
			throw err
		}
	}

	console.debug("Fetched", bookmarks.length, "bookmarks:", bookmarks)
	bookmarks_store.set(bookmarks)
	return bookmarks
}

export const bookmarks_save = async (bookmarks: Bookmark[]) => {
	await fs_check_response(
		await fetch(
			fs_path_url(bookmarks_file) + "?make_parents=true",
			{ method: "PUT", body: JSON.stringify(bookmarks) },
		)
	)
	console.debug("Saved", bookmarks.length, "bookmarks:", bookmarks)
	bookmarks_store.set(bookmarks)
}

export const bookmark_add = async (bm: Bookmark): Promise<Bookmark[]> => {
	let bookmarks: Bookmark[] = []
	try {
		loading_start()

		// Get bookmarks
		bookmarks = await bookmarks_get()

		// Add new bookmark
		bookmarks.push(bm)

		// Save new bookmarks
		await bookmarks_save(bookmarks)
	} finally {
		loading_finish()
	}
	return bookmarks
}

export const bookmark_del = async (id: string): Promise<Bookmark[]> => {
	let bookmarks: Bookmark[] = []
	try {
		loading_start()

		// Get bookmarks
		bookmarks = await bookmarks_get()

		// Delete bookmark
		for (let i = 0; i < bookmarks.length; i++) {
			if (bookmarks[i].id === id) {
				console.debug("Deleting bookmark at index", i, bookmarks[i])
				bookmarks.splice(i, 1)
				break
			}
		}

		// Save new bookmarks
		await bookmarks_save(bookmarks)
	} finally {
		loading_finish()
	}
	return bookmarks
}