import { Display, Playlist, Song } from '@lyrics/models.ts'

export const kv = await Deno.openKv('lyrics')

export const TablesForModels = {
	'song': Song,
	'playlist': Playlist,
	'display': Display,
}

function crudFor<
	P extends keyof typeof TablesForModels,
	T extends { id: string },
	M extends { parse: (a: T) => T },
>(m: M, p: P) {
	return {
		async all(): Promise<T[]> {
			const result: T[] = []
			for await (const v of kv.list<T>({ prefix: [p] })) {
				result.push(m.parse(v.value))
			}
			return result
		},
		async get(id: string): Promise<T | null> {
			const e = await kv.get<T>([p, id])
			if (e.value == null) return null
			return m.parse(e.value)
		},
		async save(t: T) {
			return await kv.set([p, t.id], t)
		},
		async delete(id: string) {
			return await kv.delete([p, id])
		},
	}
}

export const db = {
	song: crudFor(Song, 'song'),
	playlist: crudFor(Playlist, 'playlist'),
	display: crudFor(Display, 'display'),
}