// tested class
import { YoutubeListenerRss } from "../";

// Unit test
import path from "path";

import events from "events";

import nock from "nock";
import * as chai from "chai";
import sinon from "ts-sinon";
import sinonChai from "sinon-chai";

chai.use(sinonChai);
const expect = chai.expect;

// default value (more easy when it's aliases)
const defaultChannelID = "UCh2YBKhYIy-_LtfCIn2Jycg";
const defaultTimeloop = 15;
const defaultHistory = ["https://www.youtube.com/watch?v=OYoZgsyu7tw"];

// expected value during my test
const expectedChannelAddress = `https://www.youtube.com/feeds/videos.xml?channel_id=${defaultChannelID}`;
const expectedCustomFields = {
  description: ["media:group", "media:description"],
  icon: ["media:group", "media:thumbnail"],
};

const expectedElmts = require("./RessourcesTest/expectedElmts.json");
const expectedFirstElmt = expectedElmts[0];
const expectedLastElmt = expectedElmts[1];

// let's test
describe("test ytbListener_RSS class", function () {
  describe("test constructor", function () {
    it("construct with 3 params", function () {
      // given
      const listener = new YoutubeListenerRss(
        defaultChannelID,
        defaultTimeloop, // 15 sec
        defaultHistory
      );

      // assertions
      expect(listener.address).to.be.eql(expectedChannelAddress);
      expect(listener.timeloop).to.be.eql(defaultTimeloop);
      expect(listener.customfields).to.be.eql(expectedCustomFields);
      expect(listener.lastEntriesLinks).to.be.eql(defaultHistory);
    });

    it("construct with 2 params (without history)", function () {
      // given
      const listener = new YoutubeListenerRss(
        defaultChannelID,
        defaultTimeloop // 15 sec
      );

      // assertions
      expect(listener.address).to.be.eql(expectedChannelAddress);
      expect(listener.timeloop).to.be.eql(defaultTimeloop);
      expect(listener.customfields).to.be.eql(expectedCustomFields);
    });

    it("construct with 1 params (without history and timeloop)", function () {
      // given
      const listener = new YoutubeListenerRss(defaultChannelID);

      // assertions
      expect(listener.address).to.be.eql(expectedChannelAddress);
      expect(listener.timeloop).to.be.eql(5 * 60);
      expect(listener.customfields).to.be.eql(expectedCustomFields);
    });
  });

  describe("integration test", function () {
    beforeEach(function () {
      nock.disableNetConnect();
    });

    afterEach(function () {
      nock.cleanAll();
    });

    it("fetches", async function () {
      // given
      nock("https://www.youtube.com")
        .get("/feeds/videos.xml?channel_id=UCh2YBKhYIy-_LtfCIn2Jycg")
        .replyWithFile(
          200,
          path.join(__dirname, "RessourcesTest/youtube_feed.rss"),
          {
            "content-type": "text/xml",
            charset: "UTF-8",
          }
        );

      const listener = new YoutubeListenerRss(
        defaultChannelID,
        defaultTimeloop
      );

      //when
      const res = await listener.fetchRSS();

      // assertion
      expect(res.items[0]).to.be.eql(expectedFirstElmt);
      expect(res.items[res.items.length - 1]).to.be.eql(expectedLastElmt);
    });

    /**
     * This test will test the usage of the librairie with, in the order
     *  - 1 fetch of the original document (here trigger update and new_entries events)
     *  - 1 fetch with the original document and a new entry (here trigger update and new_entries events)
     *  - 1 fetch of the previous document (here trigger update events)
     */
    it("fetches with start loop in 3 times", async function () {
      // given
      const clock = sinon.useFakeTimers();

      nock("https://www.youtube.com")
        .get("/feeds/videos.xml?channel_id=UCh2YBKhYIy-_LtfCIn2Jycg")
        .replyWithFile(
          200,
          path.join(__dirname, "RessourcesTest/youtube_feed.rss"),
          {
            "content-type": "text/xml",
            charset: "UTF-8",
          }
        );

      const listener = new YoutubeListenerRss(
        defaultChannelID,
        defaultTimeloop
      );

      // spy
      const updateListenerSpy = sinon.spy();
      const newEntriesListenerSpy = sinon.spy();

      // start timer
      listener.on("update", updateListenerSpy);
      listener.on("newEntries", newEntriesListenerSpy);

      listener.start();

      // when
      await events.once(listener, "update");

      // assertion
      expect(updateListenerSpy).to.have.been.calledOnce;
      expect(updateListenerSpy.firstCall.args[0])
        .to.have.property("items")
        .that.deep.include.members([expectedFirstElmt, expectedLastElmt]);
      expect(newEntriesListenerSpy).to.have.been.called;
      expect(
        newEntriesListenerSpy.firstCall.args[0]
      ).that.deep.include.members([expectedFirstElmt, expectedLastElmt]);
      expect(updateListenerSpy.firstCall.args[0].items.length).to.be.eql(
        newEntriesListenerSpy.firstCall.args[0].length
      );

      // todo update the rss feed
      // Fake RSS entry to simulate an update
      const newEntry = expectedElmts[2];

      nock("https://www.youtube.com")
        .get("/feeds/videos.xml?channel_id=UCh2YBKhYIy-_LtfCIn2Jycg")
        .replyWithFile(
          200,
          path.join(__dirname, "RessourcesTest/youtube_feed_new_entries.rss"),
          {
            "content-type": "text/xml",
            charset: "UTF-8",
          }
        );

      // when
      await clock.tickAsync(15000);
      await events.once(listener, "update");

      // assertion
      expect(updateListenerSpy).to.have.been.calledTwice;
      expect(updateListenerSpy.secondCall.args[0])
        .to.have.property("items")
        .that.deep.include.members([
          expectedFirstElmt,
          expectedLastElmt,
          newEntry,
        ]);
      expect(newEntriesListenerSpy).to.have.been.calledTwice;
      expect(updateListenerSpy.secondCall.args[0])
        .to.have.property("items")
        .that.deep.include.members([newEntry]);

      // when
      nock("https://www.youtube.com")
        .get("/feeds/videos.xml?channel_id=UCh2YBKhYIy-_LtfCIn2Jycg")
        .replyWithFile(
          200,
          path.join(__dirname, "RessourcesTest/youtube_feed_new_entries.rss"),
          {
            "content-type": "text/xml",
            charset: "UTF-8",
          }
        );

      await clock.tickAsync(15000);
      await events.once(listener, "update");

      // assertion
      expect(updateListenerSpy).to.have.been.calledThrice;
      expect(updateListenerSpy.secondCall.args[0])
        .to.have.property("items")
        .that.deep.include.members([
          expectedFirstElmt,
          expectedLastElmt,
          newEntry,
        ]);
      expect(newEntriesListenerSpy).to.not.have.been.calledThrice;

      // then
      listener.stop();
    });

    /**
     * This test will test the usage of the librairie with, in the order
     *  - 1 fetch of the original document (here trigger update and new_entries events)
     *  - 1 fetch with the original document and a new entry (here trigger update and new_entries events)
     *  - 1 fetch of the previous document (here trigger update events)
     */
    it("fetches with start loop in 3 times and history is initialize", async function () {
      // given
      const clock = sinon.useFakeTimers();

      nock("https://www.youtube.com")
        .get("/feeds/videos.xml?channel_id=UCh2YBKhYIy-_LtfCIn2Jycg")
        .replyWithFile(
          200,
          path.join(__dirname, "RessourcesTest/youtube_feed.rss"),
          {
            "content-type": "text/xml",
            charset: "UTF-8",
          }
        );

      const listener = new YoutubeListenerRss(
        defaultChannelID,
        defaultTimeloop,
        defaultHistory
      );

      // spy
      const updateListenerSpy = sinon.spy();
      const newEntriesListenerSpy = sinon.spy();

      // start timer
      listener.on("update", updateListenerSpy);
      listener.on("newEntries", newEntriesListenerSpy);

      listener.start();

      // when
      await events.once(listener, "update");

      // assertion
      expect(updateListenerSpy).to.have.been.calledOnce;
      expect(updateListenerSpy.firstCall.args[0])
        .to.have.property("items")
        .that.deep.include.members([expectedFirstElmt, expectedLastElmt]);
      expect(newEntriesListenerSpy).to.have.been.called;
      expect(newEntriesListenerSpy.firstCall.args[0])
        .that.deep.include.members([expectedLastElmt])
        .and.that.not.deep.include.members([expectedFirstElmt]);
      expect(updateListenerSpy.firstCall.args[0].items.length).to.be.eql(
        newEntriesListenerSpy.firstCall.args[0].length + 1
      );

      // todo update the rss feed
      // Fake RSS entry to simulate an update
      const newEntry = expectedElmts[2];

      nock("https://www.youtube.com")
        .get("/feeds/videos.xml?channel_id=UCh2YBKhYIy-_LtfCIn2Jycg")
        .replyWithFile(
          200,
          path.join(__dirname, "RessourcesTest/youtube_feed_new_entries.rss"),
          {
            "content-type": "text/xml",
            charset: "UTF-8",
          }
        );

      // when
      await clock.tickAsync(15000);
      await events.once(listener, "update");

      // assertion
      expect(updateListenerSpy).to.have.been.calledTwice;
      expect(updateListenerSpy.secondCall.args[0])
        .to.have.property("items")
        .that.deep.include.members([
          expectedFirstElmt,
          expectedLastElmt,
          newEntry,
        ]);
      expect(newEntriesListenerSpy).to.have.been.calledTwice;
      expect(updateListenerSpy.secondCall.args[0])
        .to.have.property("items")
        .that.deep.include.members([newEntry]);

      // when
      nock("https://www.youtube.com")
        .get("/feeds/videos.xml?channel_id=UCh2YBKhYIy-_LtfCIn2Jycg")
        .replyWithFile(
          200,
          path.join(__dirname, "RessourcesTest/youtube_feed_new_entries.rss"),
          {
            "content-type": "text/xml",
            charset: "UTF-8",
          }
        );

      await clock.tickAsync(15000);
      await events.once(listener, "update");

      // assertion
      expect(updateListenerSpy).to.have.been.calledThrice;
      expect(updateListenerSpy.secondCall.args[0])
        .to.have.property("items")
        .that.deep.include.members([
          expectedFirstElmt,
          expectedLastElmt,
          newEntry,
        ]);
      expect(newEntriesListenerSpy).to.not.have.been.calledThrice;

      // then
      listener.stop();
    });
  });
});