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

vi.mock("@/src/lib/prisma", () => ({ prisma: { product: { findUnique: vi.fn() } } }));
vi.mock("@/src/lib/auth/getUser", () => ({
  getUserData: vi.fn(),
  isUser: (user: { role: string }) => user.role === "user",
}));
vi.mock("@/src/lib/stripe", () => ({ getPlatformFeeCents: () => 50 }));
vi.mock("@/src/lib/stripe-checkout", () => ({
  createBrandedCheckoutSession: vi.fn(),
  studioCheckoutBranding: () => ({}),
}));
vi.mock("@/src/modules/settings/lib/discount-validation", async (importOriginal) => {
  const actual =
    await importOriginal<typeof import("@/src/modules/settings/lib/discount-validation")>();
  return {
    reserveDiscountCode: vi.fn(),
    releaseDiscountReservation: vi.fn().mockResolvedValue(undefined),
    calculateDiscountedPriceCents: actual.calculateDiscountedPriceCents,
  };
});
vi.mock("@/src/modules/marketing/lib/consent", () => ({ grantConsentQuietly: vi.fn() }));

import { POST } from "@/src/app/api/stripe/checkout/pass/route";
import { prisma } from "@/src/lib/prisma";
import { getUserData } from "@/src/lib/auth/getUser";
import { createBrandedCheckoutSession } from "@/src/lib/stripe-checkout";
import {
  releaseDiscountReservation,
  reserveDiscountCode,
} from "@/src/modules/settings/lib/discount-validation";
import { grantConsentQuietly } from "@/src/modules/marketing/lib/consent";

const product = {
  id: "prod-1",
  name: "10er-Karte",
  credits: 10,
  priceCents: 12000,
  validityMonths: 6,
  isActive: true,
  business: {
    id: "biz-1",
    name: "Studio",
    slug: "studio",
    isPublic: true,
    branding: null,
    stripeAccountId: "acct_studio",
    stripeAccountStatus: "active",
  },
};

function request(body: unknown) {
  return new Request("http://localhost/api/stripe/checkout/pass", {
    method: "POST",
    body: JSON.stringify(body),
  }) as never;
}

beforeEach(() => {
  vi.clearAllMocks();
  vi.mocked(getUserData).mockResolvedValue({
    id: "user-1",
    email: "kunde@example.com",
    role: "user",
  } as never);
  vi.mocked(prisma.product.findUnique).mockResolvedValue(product as never);
  vi.mocked(createBrandedCheckoutSession).mockResolvedValue({ url: "https://stripe/x" } as never);
});

describe("POST /api/stripe/checkout/pass", () => {
  it("schickt Gäste zum Login", async () => {
    vi.mocked(getUserData).mockResolvedValue(null);
    const res = await POST(request({ productId: "prod-1" }));
    expect(res.status).toBe(401);
    expect((await res.json()).loginRequired).toBe(true);
  });

  it("lässt Team-Accounts keine Karte kaufen", async () => {
    vi.mocked(getUserData).mockResolvedValue({ id: "m1", role: "manager" } as never);
    expect((await POST(request({ productId: "prod-1" }))).status).toBe(403);
  });

  it("verkauft keine Karte, die nicht im Verkauf ist", async () => {
    vi.mocked(prisma.product.findUnique).mockResolvedValue({
      ...product,
      isActive: false,
    } as never);
    expect((await POST(request({ productId: "prod-1" }))).status).toBe(404);
    expect(createBrandedCheckoutSession).not.toHaveBeenCalled();
  });

  it("nimmt die Servicegebühr pro Einheit als application_fee auf dem Studio-Account", async () => {
    const res = await POST(request({ productId: "prod-1" }));

    expect(res.status).toBe(200);
    const [params, , accountId] = vi.mocked(createBrandedCheckoutSession).mock.calls[0];
    expect(accountId).toBe("acct_studio");
    expect(params.payment_intent_data?.application_fee_amount).toBe(500);
    expect(params.line_items).toEqual([
      expect.objectContaining({
        quantity: 1,
        price_data: expect.objectContaining({ unit_amount: 12000 }),
      }),
      expect.objectContaining({
        quantity: 10,
        price_data: expect.objectContaining({ unit_amount: 50 }),
      }),
    ]);
    expect(params.metadata).toMatchObject({ kind: "pass", productId: "prod-1", userId: "user-1" });
  });

  describe("mit Rabattcode", () => {
    beforeEach(() => {
      vi.mocked(reserveDiscountCode).mockResolvedValue({
        reserved: true,
        reservationToken: "tok-1",
        discountCode: { id: "code-1", type: "percent", value: 25 },
      });
    });

    it("mindert nur den Kartenpreis, nie die Servicegebühr", async () => {
      const res = await POST(request({ productId: "prod-1", discountCode: "KARTE25" }));
      expect(res.status).toBe(200);

      expect(reserveDiscountCode).toHaveBeenCalledWith(expect.anything(), {
        code: "KARTE25",
        businessId: "biz-1",
        productId: "prod-1",
        userId: "user-1",
      });
      const params = vi.mocked(createBrandedCheckoutSession).mock.calls[0][0];
      expect(params.line_items?.[0].price_data?.unit_amount).toBe(9000);
      expect(params.payment_intent_data?.application_fee_amount).toBe(500);
      expect(params.metadata).toMatchObject({
        discountCodeId: "code-1",
        discountAmountCents: "3000",
        discountReservationToken: "tok-1",
      });
    });

    it("lehnt einen ungültigen Code ab, statt zum vollen Preis weiterzumachen", async () => {
      vi.mocked(reserveDiscountCode).mockResolvedValue({
        reserved: false,
        reason: "Dieser Rabattcode gilt nicht für Karten.",
      });
      const res = await POST(request({ productId: "prod-1", discountCode: "KURS10" }));
      expect(res.status).toBe(400);
      expect((await res.json()).error).toBe("Dieser Rabattcode gilt nicht für Karten.");
      expect(createBrandedCheckoutSession).not.toHaveBeenCalled();
    });

    it("gibt die Reservierung frei, wenn Stripe die Session nicht anlegt", async () => {
      vi.mocked(createBrandedCheckoutSession).mockRejectedValue(new Error("Stripe weg"));
      vi.spyOn(console, "error").mockImplementation(() => {});
      const res = await POST(request({ productId: "prod-1", discountCode: "KARTE25" }));
      expect(res.status).toBe(500);
      expect(releaseDiscountReservation).toHaveBeenCalledWith(expect.anything(), "tok-1");
    });
  });

  it("antwortet bei falschen Feldtypen mit 400 statt 500", async () => {
    const res = await POST(request({ productId: "prod-1", discountCode: 5 }));
    expect(res.status).toBe(400);
    expect(reserveDiscountCode).not.toHaveBeenCalled();
    expect((await POST(request({ productId: "" }))).status).toBe(400);
  });

  it("antwortet bei kaputtem JSON mit 400", async () => {
    const res = await POST(
      new Request("http://localhost/api/stripe/checkout/pass", {
        method: "POST",
        body: "{kein json",
      }) as never
    );
    expect(res.status).toBe(400);
  });

  it("speichert das Häkchen für Werbe-Mails", async () => {
    await POST(request({ productId: "prod-1", marketingConsent: true }));
    expect(grantConsentQuietly).toHaveBeenCalledWith({
      userId: "user-1",
      businessId: "biz-1",
      source: "pass_purchase",
    });
  });

  it("ohne Häkchen keine Einwilligung", async () => {
    await POST(request({ productId: "prod-1" }));
    expect(grantConsentQuietly).not.toHaveBeenCalled();
  });
});