import { beforeAll, describe, expect, it } from "vitest";
import { Timestamp } from "firebase-admin/firestore";
import { firestore } from "../../src/firebase";
import { createOrder, resolveOrderOption, transitionOrder } from "../../src/services/orderService";
import { HttpError } from "../../src/middleware/errors";

const options = [
  { id: "blue", name: "블루" },
  { id: "red", name: "레드" },
];

describe("resolveOrderOption", () => {
  it("옵션 상품은 optionId 를 실제 옵션으로 해석한다", () => {
    expect(resolveOrderOption({ options }, "blue")).toEqual({ id: "blue", name: "블루" });
  });

  it("옵션 상품에 optionId 가 없으면 OPTION_REQUIRED 로 거부한다", () => {
    expect(() => resolveOrderOption({ options }, undefined)).toThrowError(
      expect.objectContaining({ status: 400, code: "OPTION_REQUIRED" }) as HttpError,
    );
  });

  it("옵션 상품에 존재하지 않는 optionId 도 OPTION_REQUIRED 로 거부한다", () => {
    expect(() => resolveOrderOption({ options }, "green")).toThrowError(
      expect.objectContaining({ status: 400, code: "OPTION_REQUIRED" }) as HttpError,
    );
  });

  it("무옵션 상품은 optionId 없이 null 을 돌려준다", () => {
    expect(resolveOrderOption({}, undefined)).toBeNull();
    expect(resolveOrderOption({ options: [] }, undefined)).toBeNull();
  });

  it("무옵션 상품에 optionId 가 오면 INVALID_INPUT 으로 거부한다", () => {
    expect(() => resolveOrderOption({}, "blue")).toThrowError(
      expect.objectContaining({ status: 400, code: "INVALID_INPUT" }) as HttpError,
    );
  });
});

const uid = "order-service-test-user";
const seedNow = Timestamp.now();
const recipient = { name: "홍길동", phone: "01000000000", address1: "서울", postalCode: "00000" };

beforeAll(async () => {
  // 잔액 1000P 지갑과 활성 상품을 시드한다. (불변식: available = earned - spent)
  await firestore.doc(`users/${uid}/wallet/current`).set({
    availableBalance: 1000, totalEarned: 1000, totalSpent: 0,
    version: 1, createdAt: seedNow, updatedAt: seedNow,
  });
  await firestore.doc("products/ost-product").set({
    name: "테스트 키링", pointPrice: 300, active: true, redeemable: true,
    mainImages: [], detailImages: [], displayOrder: 1, createdAt: seedNow, updatedAt: seedNow,
  });
});

describe("createOrder (즉시 차감)", () => {
  it("주문이 confirmed 로 생성되고 포인트가 즉시 차감된다", async () => {
    const result = await createOrder(uid, {
      clientIdempotencyKey: "immediate-1",
      items: [{ productId: "ost-product", qty: 1 }],
      recipient,
    });

    expect(result.order.status).toBe("confirmed");
    expect(result.order.confirmedAt).toBeTruthy();
    expect(result.order.debitLedgerTxId).toBe(`${uid}:order:${result.order.id}:debit`);
    expect(result.availableBalance).toBe(700);

    const entry = await firestore.doc(`users/${uid}/pointLedger/${result.order.debitLedgerTxId}`).get();
    expect(entry.exists).toBe(true);
    expect(entry.data()).toMatchObject({ type: "order_capture", op: "debit", amount: 300 });
  });

  it("잔액이 부족하면 409", async () => {
    await expect(
      createOrder(uid, {
        clientIdempotencyKey: "too-expensive",
        items: [{ productId: "ost-product", qty: 100 }],
        recipient,
      }),
    ).rejects.toMatchObject({ status: 409 });
  });
});

describe("transitionOrder (간소화된 전이)", () => {
  it("유저(비어드민)는 어떤 전이도 할 수 없다", async () => {
    await expect(transitionOrder(`${uid}_immediate-1`, "shipped", uid)).rejects.toMatchObject({ status: 403 });
  });

  it("전이 테이블에 없는 전이는 409 (confirmed → delivered 직행 불가)", async () => {
    await expect(
      transitionOrder(`${uid}_immediate-1`, "delivered", "admin-uid", { admin: true }),
    ).rejects.toMatchObject({ status: 409 });
  });

  it("어드민 환불 시 포인트가 반환되고 차감 txId 가 reversalOf 로 링크된다", async () => {
    const orderId = `${uid}_immediate-1`;
    const result = await transitionOrder(orderId, "refunded", "admin-uid", { admin: true });
    expect(result.status).toBe("refunded");

    const wallet = await firestore.doc(`users/${uid}/wallet/current`).get();
    expect(wallet.data()).toMatchObject({ availableBalance: 1000, totalSpent: 0 });

    const refundEntry = await firestore.doc(`users/${uid}/pointLedger/${uid}:order:${orderId}:refund`).get();
    expect(refundEntry.exists).toBe(true);
    expect(refundEntry.data()).toMatchObject({
      type: "order_refund", op: "credit", amount: 300,
      reversalOf: `${uid}:order:${orderId}:debit`,
    });
  });
});