import { describe, expect, it, vi } from "vitest";
import { loadSession, signIn, WRONG_CREDENTIALS } from "@/lib/auth-client";

const json = (body: unknown, status = 200) =>
  new Response(JSON.stringify(body), { status, headers: { "content-type": "application/json" } });

describe("signIn", () => {
  it("wrong password gives the one message", async () => {
    const f = vi.fn(async () => json({ error: "Email or password is incorrect." }, 401));
    expect(await signIn("a@b.co", "bad", f as unknown as typeof fetch)).toEqual({ ok: false, message: WRONG_CREDENTIALS });
  });
  it("success returns the person and posts JSON to /api/session", async () => {
    const f = vi.fn(async () => json({ name: "Ann", email: "a@b.co", pictureUrl: null }));
    const r = await signIn("a@b.co", "pw", f as unknown as typeof fetch);
    expect(r).toEqual({ ok: true, person: { name: "Ann", email: "a@b.co", pictureUrl: null } });
    expect(f.mock.calls[0]).toMatchObject(["/api/session", { method: "POST" }]);
  });
  it("network failure is not the wrong-password message", async () => {
    const f = vi.fn(async () => { throw new Error("down"); });
    const r = await signIn("a@b.co", "pw", f as unknown as typeof fetch);
    expect(r.ok).toBe(false);
    if (!r.ok) expect(r.message).not.toBe(WRONG_CREDENTIALS);
  });
});

describe("loadSession", () => {
  it("401 means signed out", async () => {
    const f = vi.fn(async () => json({ error: "sign_in" }, 401));
    expect(await loadSession(f as unknown as typeof fetch)).toBeNull();
  });
  it("200 returns the person", async () => {
    const f = vi.fn(async () => json({ name: "Ann", email: "a@b.co", pictureUrl: "u" }));
    expect((await loadSession(f as unknown as typeof fetch))?.email).toBe("a@b.co");
  });
});