import type { Db } from '../db/mod.ts'
import type { Resource } from '../models/mod.ts'
import type { UUID } from '../../types.ts'
import type { ResourceBuilder, ResourceType } from './types.ts'
import { respondJson } from './utils.ts'

export async function resourceHandler<T extends Resource>(
	type: ResourceType<T>,
	Builder: ResourceBuilder<T>,
	db: Db,
	req: Request,
	id?: string,
): Promise<Response> {
	if (req.method === 'POST') {
		try {
			const json = await req.json() as T
			try {
				//@ts-expect-error Extends from Resource
				const resource = Builder.create(json)
				//@ts-expect-error not a generic
				const result = await db.resource[type].set(resource)
				if (result.ok) {
					//@ts-expect-error generic to fix
					return respondJson(resource)
				} else {
					return respondJson(new Error(`can't insert ${resource} in db`))
				}
			} catch (error) {
				return respondJson(error)
			}
		} catch (error) {
			return respondJson(error)
		}
	}
	if (req.method === 'GET') {
		if (id === undefined) {
			return respondJson(new Error('missing "id" for "GET"'))
		}
		try {
			const resource = await db.resource[type].get({ uuid: id as UUID })
			//@ts-expect-error generic to fix
			return respondJson(resource)
		} catch {
			return respondJson(
				new Error(`can't find any ${type} with the current uuid ${id}`),
			)
		}
	}
	if (req.method === 'PATCH') {
		throw new Error('not implemented')
	}
	if (req.method === 'DELETE') {
		throw new Error('not implemented')
	}
	return respondJson(new Error(`method "${req.method}" is not allowed`))
}