import { describe, it, expect, vi } from "vitest";

vi.mock("server-only", () => ({}));
// payouts.ts importe prisma qui jette si DATABASE_URL absent — mock le module entier.
vi.mock("@/lib/prisma", () => ({ prisma: {} }));

const { monthKey, formatMonth } = await import("@/lib/payouts");

describe("monthKey", () => {
  it("normalise à minuit UTC du 1er du mois", () => {
    const k = monthKey(new Date("2026-03-15T14:30:00Z"));
    expect(k.getUTCFullYear()).toBe(2026);
    expect(k.getUTCMonth()).toBe(2); // mars = 2 (0-indexed)
    expect(k.getUTCDate()).toBe(1);
    expect(k.getUTCHours()).toBe(0);
    expect(k.getUTCMinutes()).toBe(0);
  });

  it("idempotent (mêmes inputs → même sortie)", () => {
    const a = monthKey(new Date("2026-06-30T23:59:59Z"));
    const b = monthKey(new Date("2026-06-01T00:00:00Z"));
    expect(a.getTime()).toBe(b.getTime());
  });

  it("traverse janvier sans bug", () => {
    const k = monthKey(new Date("2026-01-15T10:00:00Z"));
    expect(k.toISOString().slice(0, 10)).toBe("2026-01-01");
  });
});

describe("formatMonth", () => {
  it("rend un libellé fr-FR lisible", () => {
    const label = formatMonth(new Date(Date.UTC(2026, 5, 1)));
    expect(label).toContain("juin");
    expect(label).toContain("2026");
  });
});