import { describe, it, expect, vi } from "vitest";
import { validateDiscountCode } from "@/src/modules/settings/lib/discount-validation";

function dbWith(code: Record<string, unknown> | null) {
  return {
    discountCode: { findUnique: vi.fn().mockResolvedValue(code) },
    discountRedemption: { findUnique: vi.fn().mockResolvedValue(null) },
  } as never;
}

const baseCode = {
  id: "code-1",
  code: "SOMMER",
  type: "percent",
  value: 10,
  scope: "all_courses",
  courseIds: [],
  appliesTo: "courses",
  restrictedToUserId: null,
  maxRedemptions: null,
  redeemedCount: 0,
  startsAt: null,
  expiresAt: null,
  isActive: true,
};

const base = { code: "sommer", businessId: "biz-1", userId: "user-1" };

describe("validateDiscountCode - wofür ein Code gilt", () => {
  it("Kurs-Codes gelten nicht beim Kartenkauf", async () => {
    const result = await validateDiscountCode(dbWith(baseCode), { ...base, productId: "prod-1" });
    expect(result).toEqual({ valid: false, reason: "Dieser Rabattcode gilt nicht für Karten." });
  });

  it("Karten-Codes gelten nicht für Kurse", async () => {
    const result = await validateDiscountCode(dbWith({ ...baseCode, appliesTo: "passes" }), {
      ...base,
      courseId: "course-1",
    });
    expect(result).toEqual({ valid: false, reason: "Dieser Rabattcode gilt nur für Karten." });
  });

  it("Codes für beides gelten bei Kurs und Karte", async () => {
    const db = dbWith({ ...baseCode, appliesTo: "all" });
    expect((await validateDiscountCode(db, { ...base, courseId: "c" })).valid).toBe(true);
    expect((await validateDiscountCode(db, { ...base, productId: "p" })).valid).toBe(true);
  });

  it("die Kursauswahl wirkt beim Kartenkauf nicht", async () => {
    const db = dbWith({
      ...baseCode,
      appliesTo: "all",
      scope: "specific_courses",
      courseIds: ["c1"],
    });
    expect((await validateDiscountCode(db, { ...base, productId: "p" })).valid).toBe(true);
    expect((await validateDiscountCode(db, { ...base, courseId: "c2" })).valid).toBe(false);
  });
});

describe("validateDiscountCode - persönliche Codes", () => {
  it("gilt nur für das eigene Konto", async () => {
    const db = dbWith({ ...baseCode, restrictedToUserId: "user-1" });
    expect((await validateDiscountCode(db, { ...base, courseId: "c" })).valid).toBe(true);
    expect(await validateDiscountCode(db, { ...base, userId: "user-2", courseId: "c" })).toEqual({
      valid: false,
      reason: "Dieser Rabattcode gehört zu einem anderen Kundenkonto.",
    });
  });
});