import { control, bucket, token } from './stores.js';

let control_value;
control.subscribe(value => {
	control_value = value;
});
let bucket_value;
bucket.subscribe(value => {
	bucket_value = value;
});
let token_value;
token.subscribe(value => {
	token_value = value;
});

class RequestError extends Error {
	constructor(res) {
		super(`Request returned status ${res.status} ${res.statusText}`);
		this.res = res;
	}
}

export async function fetcher(request) {
	const resp = await fetch(request);
	if (resp.status != 200) {
		throw new RequestError(resp);
	}
	return resp;
}

export function request(method, resource, body=null) {
	const sign = new URL(control_value + '/sign');
	sign.searchParams.append('bucket', bucket_value);
	sign.searchParams.append('token', token_value);
	sign.searchParams.append('resource', resource);
	const req = new Request(sign.href, {
		method,
		body,
	});
	return req;
}

export function listPhotos(maxKeys=1000, startAfter='') {
	const prefix = "photo/";
	const params = new URLSearchParams();
	params.set("list-type", "2");
	params.set("metadata", "true");
	params.set("encoding-type", "url");
	params.set("prefix", prefix);
	params.set("delimiter", "");
	params.set("max-keys", maxKeys);
	params.set("start-after", startAfter);
	return '?' + params.toString();
}