/**
 * @file a stand-in for webapp's `WebAppFactory` entrypoint, for tests: an
 * auxiliary worker (plain JS — the vitest pool doesn't transform aux
 * workers) serving diigo-shaped `load_user_items` pages. 30 items, every
 * third private; one webapp id is known. Counts its diigo calls so tests
 * can tell a cache hit (no call) from a miss.
 */
import { RpcTarget, WorkerEntrypoint } from "cloudflare:workers";

const KNOWN_WEBAPP = "fake-webapp-id";
const TOTAL = 30;

/** item n (1-based, in diigo's order): diigo's field names, made-up
 * values. link_id and updated_at are scrambled (distinct; 7 and 11 are
 * coprime to 31), so neither column sorts back into diigo's order — a
 * cache that replays by column rather than by fetch order is caught. */
function item(n) {
	return {
		link_id: 1000 + ((n * 7) % 31),
		url: `https://example.com/${n}`,
		title: `bookmark ${n}`,
		description: "",
		private: n % 3 === 0,
		u_name: "alice_99",
		first_by: "someone-else",
		user_id: 4242,
		tags: "",
		created_at: 1700000000,
		updated_at: 1700001000 + ((n * 11) % 31),
	};
}

let calls = 0;

class FakeGet extends RpcTarget {
	#path;
	#params;
	constructor(path, params) {
		super();
		this.#path = path;
		this.#params = params;
	}
	pathjoin(ref) {
		return new FakeGet(ref, this.#params);
	}
	query(params) {
		return new FakeGet(this.#path, { ...this.#params, ...params });
	}
	async get() {
		calls += 1;
		if (this.#path !== "load_user_items") throw new Error(`fake webapp: no route ${this.#path}`);
		const count = Number(this.#params.count);
		const page = Number(this.#params.page_num);
		const items = [];
		for (let n = (page - 1) * count + 1; n <= Math.min(page * count, TOTAL); n += 1) items.push(item(n));
		return JSON.stringify({ total: TOTAL, items });
	}
}

export class WebAppFactory extends WorkerEntrypoint {
	async at(id) {
		if (id !== KNOWN_WEBAPP) throw new Error("fake webapp: unknown id");
		return new FakeGet("", {});
	}
	/** how many diigo calls so far (test hook) */
	async calls() {
		return calls;
	}
}

export default {
	fetch() {
		return new Response("fake webapp", { status: 404 });
	},
};