import { afterEach, beforeAll, describe, expect, it, mock } from "bun:test";
import request, { Response } from "supertest";
import app, { startApp } from "../src/app";
import imageService from "../src/services/ImageService";
import populateDatabase from "./populateDatabase";
import { Image } from "../src/models/ImageModel";
import { faker } from "@faker-js/faker";

const imageServiceOriginal = imageService;

let token: string;

beforeAll(async () => {
  await startApp();
  await populateDatabase();

  const tok = await request(app)
    .post("/login")
    .send({ app: "tester", secret: "test" });
  token = tok.body.token;
});

afterEach(() => {
  mock.restore();
  mock.module("../src/services/ImageService", () => ({
    default: imageServiceOriginal,
  }));
});

describe("/login works as instended", async () => {
  let correctRespose: Response;
  beforeAll(async () => {
    correctRespose = await request(app)
      .post("/login")
      .send({ app: "tester", secret: "test" });
  });

  it("should return 200 for correct login", async () => {
    expect(correctRespose.status).toBe(200);
  });

  it("should contain a token", () => {
    expect(correctRespose.body).toHaveProperty("token");
  });

  it("should return 403 for invalid credentials", async () => {
    const res = await request(app).post("/login").send({});
    expect(res.status).toBe(403);
  });
});

describe("GET / shows all of the endpoints", async () => {
  const res = await request(app).get("/");

  it("should be", async () => {
    expect(res.body).toHaveProperty("endpoints");
  });

  it("should be an array", () => {
    expect(Array.isArray(res.body.endpoints)).toBeTrue();
  });
});

describe("GET /images works properly", async () => {
  const res = await request(app).get("/images");

  it("should be an array", () => {
    expect(Array.isArray(res.body.images)).toBeTrue();
  });

  it("should return a 200", async () => {
    expect(res.statusCode).toBe(200);
  });

  it("should return 500 for an error on the service", async () => {
    mock.module("../src/services/ImageService", () => ({
      default: {
        findAll: () => {
          throw new Error("This is an expected testing error");
        },
      },
    }));

    const res = await request(app).get("/images");

    expect(res.status).toBe(500);
  });

  it("should return 400 for an invalid status param value", async () => {
    const res = await request(app).get("/images?status=foo");
    expect(res.statusCode).toBe(400);
  });

  it("should return 200 for a request with valid status param", async () => {
    const status = faker.helpers.arrayElement(["consumed", "available", "unavailable"])
    const res = await request(app).get(`/images?status=${status}`);
    expect(res.statusCode).toBe(200);
  });

  it("should only have the requested status in the images", async () => {
    const status = faker.helpers.arrayElement(["consumed", "available", "unavailable"])
    const res = await request(app).get(`/images?status=${status}`);
    expect(res.body.images
      .map((image: Image) => image.status)
      .every((imageStatus: string) => imageStatus === status)).toBeTrue();
  });

  it("should return 400 for a floating point value in limit value", async () => {
    const res = await request(app).get("/images?limit=2.4");
    expect(res.statusCode).toBe(400);
  });

  it("should return 400 for a negative value in limit value", async () => {
    const res = await request(app).get("/images?limit=-1");
    expect(res.statusCode).toBe(400);
  });

  it("should return 400 for a NaN limit value", async () => {
    const res = await request(app).get("/images?limit=foo");
    expect(res.statusCode).toBe(400);
  });

  it("should return 200 for a request with valid limit param", async () => {
    const limit = faker.number.int({ min: 5, max: 50 });
    const res = await request(app).get(`/images?limit=${limit}`);
    expect(res.statusCode).toBe(200);
  });

  it("should return 200 for a request with valid limit param", async () => {
    const limit = faker.number.int({ min: 5, max: 50 });
    const res = await request(app).get(`/images?limit=${limit}`);
    expect(res.body.images.length).toBeLessThanOrEqual(limit);
  });

  it("should return 200 for a request with both valid params", async () => {
    const res = await request(app).get("/images?limit=3&status=available");
    expect(res.statusCode).toBe(200);
  });

  it("should return the same ids using limit=0 and using no limit parameter", async () => {
    const resLimit0 = await request(app).get("/images?limit=0");
    const resNoLimit = await request(app).get("/images");

    const ids1 = resNoLimit.body.images.map((image: Image) => image._id);
    const ids2 = resLimit0.body.images.map((image: Image) => image._id);

    expect(ids1.length).toBe(ids2.length);
    ids1.forEach((id: string) => expect(ids2).toContain(id));
  })
});

describe("POST /images works properly", () => {
  it("should return 401 for unauthenticated requests", async () => {
    const res = await request(app)
      .post("/images")
      .send({
        url: "https://test.url.com/0",
        status: "available",
        tags: ["2girls", "touhou"],
      });
    expect(res.status).toBe(401);
  });

  it("should return 403 for invalid tokens", async () => {
    const res = await request(app)
      .post("/images")
      .set("authorization", `Bearer token`)
      .send({
        url: "https://test.url.com/0",
        status: "available",
        tags: ["2girls", "touhou"],
      });
    expect(res.status).toBe(403);
  });

  it("should return 201 for new image", async () => {
    const res = await request(app)
      .post("/images")
      .set("authorization", `Bearer ${token}`)
      .send({
        url: "https://test.url.com/1",
        status: "available",
        tags: ["2girls", "touhou"],
      });
    expect(res.status).toBe(201);
  });

  it("should return 409 for a repeated images", async () => {
    await request(app)
      .post("/images")
      .set("authorization", `Bearer ${token}`)
      .send({
        url: "https://test.url.com/2",
        status: "available",
        tags: ["2girls", "touhou"],
      });

    const res = await request(app)
      .post("/images")
      .set("authorization", `Bearer ${token}`)
      .send({
        url: "https://test.url.com/2",
        status: "available",
        tags: ["2girls", "touhou"],
      });

    expect(res.status).toBe(409);
  });

  it("should return 500 for an error on the service", async () => {
    mock.module("../src/services/ImageService", () => ({
      default: {
        add: () => {
          throw new Error("This is an expected testing error");
        },
      },
    }));

    const res = await request(app)
      .post("/images")
      .set("authorization", `Bearer ${token}`)
      .send({
        url: "https://test.url.com/3",
        status: "available",
        tags: ["2girls", "touhou"],
      });

    expect(res.status).toBe(500);
  });

  it("should return 400 for malformed requests", async () => {
    mock.restore();
    const res = await request(app)
      .post("/images")
      .set("authorization", `Bearer ${token}`)
      .send({
        url: "https://test.url.com/4",
        status: "wrong",
        tags: ["2girls", "touhou"],
      });
    expect(res.status).toBe(400);
  });
});

describe("GET /images/:id works properly", () => {
  it("should return 200 for existing ids", async () => {
    const list = await request(app).get("/images");
    const id = list.body.images[0]._id;
    const res = await request(app).get(`/images/${id}`);
    expect(res.status).toBe(200);
  });

  it("should return 404 for non-existing ids", async () => {
    const list = await request(app).get("/images");
    const id = "000000000000000000000000"; // this was the least posible to exist ID
    if (!(id in list.body.images)) {
      const res = await request(app).get(`/images/${id}`);
      expect(res.status).toBe(404);
    }
  });

  it("should return 400 for malformed ids", async () => {
    const res = await request(app).get("/images/98439384");
    expect(res.status).toBe(400);
  });
});