import { describe, expect, it } from "vitest";
import { recommendUsers } from "$lib/components/ui/markdownSuggestions";

const person = (n: number) => ({ did: `did:plc:${n}`, handle: `user${n}.test` });

describe("recommendUsers", () => {
	it("keeps the first five distinct people in order", () => {
		const people = [
			person(1),
			person(2),
			person(1),
			person(3),
			person(4),
			person(5),
			person(6)
		];
		expect(recommendUsers(people, undefined).map((user) => user.handle)).toEqual([
			"user1.test",
			"user2.test",
			"user3.test",
			"user4.test",
			"user5.test"
		]);
	});

	it("skips the viewer and people without a usable handle", () => {
		const people = [
			person(1),
			{ did: "did:plc:x" },
			{ did: "did:plc:y", handle: "handle.invalid" },
			person(2)
		];
		expect(recommendUsers(people, "did:plc:1").map((user) => user.handle)).toEqual([
			"user2.test"
		]);
	});

	it("inserts a mention with a trailing space", () => {
		expect(recommendUsers([person(7)], undefined)[0].insert).toBe("@user7.test ");
	});
});