import { afterEach, beforeEach, describe, expect, test } from "bun:test";
import type { AppWithContext } from "../app";
import { buildApp } from "../app";
import { createUser } from "../users/user-repository";

let app: AppWithContext;
let employeeCookie = "";

function firstHeader(value: string | string[] | undefined) {
  return Array.isArray(value) ? value[0] : value ?? "";
}

async function login(username: string) {
  const response = await app.inject({ method: "POST", url: "/api/login", payload: { username } });
  return firstHeader(response.headers["set-cookie"]);
}

beforeEach(async () => {
  app = await buildApp(":memory:");

  await createUser(app.dbContext, {
    username: "dev-employee",
    name: "Dev Employee",
    email: "dev.employee@example.com",
    role: "employee"
  });

  employeeCookie = await login("dev-employee");
});

afterEach(async () => {
  await app.close();
});

describe("assignment 3 quantity validation", () => {
  test("allows quantity changes for pending orders", async () => {
    const response = await app.inject({
      method: "POST",
      url: "/api/orders/order_1/items/item_1/quantity",
      headers: { cookie: employeeCookie },
      payload: { quantity: 5 }
    });

    expect(response.statusCode).toBe(200);
    expect(response.json().items.find((item: { id: string }) => item.id === "item_1")?.quantity).toBe(5);
  });

  test("rejects quantity changes for processing orders", async () => {
    const response = await app.inject({
      method: "POST",
      url: "/api/orders/order_2/items/item_3/quantity",
      headers: { cookie: employeeCookie },
      payload: { quantity: 2 }
    });

    expect(response.statusCode).toBe(400);
  });

  test("rejects quantity changes for shipped orders", async () => {
    const response = await app.inject({
      method: "POST",
      url: "/api/orders/order_3/items/item_4/quantity",
      headers: { cookie: employeeCookie },
      payload: { quantity: 1 }
    });

    expect(response.statusCode).toBe(400);
  });

  test("rejects quantity outside the allowed range", async () => {
    const response = await app.inject({
      method: "POST",
      url: "/api/orders/order_1/items/item_1/quantity",
      headers: { cookie: employeeCookie },
      payload: { quantity: 0 }
    });

    expect(response.statusCode).toBe(400);
  });

  test("rejects quantity above effective inventory", async () => {
    const response = await app.inject({
      method: "POST",
      url: "/api/orders/order_1/items/item_1/quantity",
      headers: { cookie: employeeCookie },
      payload: { quantity: 9 }
    });

    expect(response.statusCode).toBe(400);
  });
});