import { FreshContext, Handlers } from '$fresh/server.ts'
import { db, TablesForModels } from '@lyrics/db.ts'
import { ulid } from 'https://deno.land/std@0.209.0/ulid/mod.ts'

export function crudHandlerFor<
	T extends { id: string },
	M extends { parse: (a: unknown) => T },
	P extends keyof typeof TablesForModels,
>(m: M, p: P): Handlers {
	return {
		async GET(req: Request, _ctx: FreshContext) {
			const url = new URL(req.url)
			const id = url.searchParams.get('id')
			if (id == null) {
				return new Response(JSON.stringify(await db[p].all()))
			} else {
				return new Response(JSON.stringify(await db[p].get(id)))
			}
		},

		async PUT(req: Request, _ctx: FreshContext) {
			const data = m.parse(await req.json())
			if (!data.id) data.id = ulid()
			return new Response(JSON.stringify(await db[p].save(data)))
		},

		async DELETE(req: Request, _ctx: FreshContext) {
			const url = new URL(req.url)
			const id = url.searchParams.get('id')
			if (id == null) {
				return new Response(
					JSON.stringify({ message: 'no id query parameter provided' }),
					{ status: 401 },
				)
			} else {
				return new Response(JSON.stringify(await db[p].delete(id)))
			}
		},
	}
}