// external lib
import * as Parser from "rss-parser";

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

// Unit test
import assert from "assert";
import * as chai from "chai";
import sinon from "ts-sinon";
import sinonChai from "sinon-chai";
import { ImportMock, InPlaceMockManager } from "ts-mock-imports";

chai.use(sinonChai);

const expect = chai.expect;

describe("test class RSS: jsonfile", function () {
  const infosListener: ListenerRss.Config = {
    address: "fake.rss.service",
    timeloop: 15,
    customfields: {
      description: ["media:group", "media:description"],
      icon: ["media:group", "media:thumbnail"],
    },
    lastEntriesLinks: ["my_url_02.com"],
  };

  const mockedRSSOutput: Parser.Output<any> = {
    items: [
      {
        title: "my title 02",
        "media:group": {
          "media:description": "my description 02",
          "media:thumbnail": [
            { $: { height: 360, width: 420, url: "my_image02.jpg" } },
          ],
        },
        link: "my_url_02.com",
        pubDate: "myDate02",
      },
      {
        title: "my title 01",
        "media:group": {
          "media:description": "my description 01",
          "media:thumbnail": [
            { $: { height: 360, width: 420, url: "my_image01.jpg" } },
          ],
        },
        link: "my_url_01.com",
        pubDate: "myDate01",
      },
      {
        title: "my title 00",
        "media:group": {
          "media:description": "my description 00",
          "media:thumbnail": [
            { $: { height: 360, width: 420, url: "my_image00.jpg" } },
          ],
        },
        link: "my_url_00.com",
        pubDate: "myDate00",
      },
    ],
  };

  describe("Building Ytb listener", function () {
    it("builds with 4 params", function () {
      const myListener = new ListenerRss({
        address: "fake.rss.service",
        timeloop: 15,
        customfields: {
          description: ["media:group", "media:description"],
          icon: ["media:group", "media:thumbnail"],
        },
        lastEntriesLinks: ["my_url_02.com"],
      });

      // assertions
      // myListener data
      expect(myListener.timeloop).to.eql(15);
      expect(myListener.address).to.eql("fake.rss.service");
      expect(myListener.customfields).to.eql({
        description: ["media:group", "media:description"],
        icon: ["media:group", "media:thumbnail"],
      });
      expect(myListener.parser)
        .to.have.property("options")
        .to.have.property("customFields")
        .to.be.eql({
          feed: [],
          item: ["media:group", "media:group"],
        });
      expect(myListener.lastEntriesLinks).to.be.eql(["my_url_02.com"]);
    });

    it("builds with 3 params (no custom fields)", function () {
      const myListener = new ListenerRss({
        address: "fake.rss.service",
        timeloop: 15,
        lastEntriesLinks: ["my_url_02.com"],
      });

      // assertions
      // myListener data
      expect(myListener.timeloop).to.eql(15);
      expect(myListener.address).to.eql("fake.rss.service");
      expect(myListener.customfields).to.eql(undefined);
      expect(myListener.parser)
        .to.have.property("options")
        .to.have.property("customFields")
        .to.be.eql({
          feed: [],
          item: [],
        });
      expect(myListener.lastEntriesLinks).to.be.eql(["my_url_02.com"]);
    });

    it("build with 3 params (no timeloop)", function () {
      const myListener = new ListenerRss({
        address: "fake.rss.service",
        customfields: {
          description: ["media:group", "media:description"],
          icon: ["media:group", "media:thumbnail"],
        },
        lastEntriesLinks: ["my_url_02.com"],
      });

      // assertions
      // myListener data
      expect(myListener.timeloop).to.eql(5 * 60);
      expect(myListener.address).to.eql("fake.rss.service");
      expect(myListener.customfields).to.eql({
        description: ["media:group", "media:description"],
        icon: ["media:group", "media:thumbnail"],
      });
      expect(myListener.parser)
        .to.have.property("options")
        .to.have.property("customFields")
        .to.be.eql({
          feed: [],
          item: ["media:group", "media:group"],
        });
      expect(myListener.lastEntriesLinks).to.be.eql(["my_url_02.com"]);
    });

    it("build with 3 params (no lastEntries)", function () {
      const myListener = new ListenerRss({
        address: "fake.rss.service",
        customfields: {
          description: ["media:group", "media:description"],
          icon: ["media:group", "media:thumbnail"],
        },
      });

      // assertions
      // myListener data
      expect(myListener.timeloop).to.eql(5 * 60);
      expect(myListener.address).to.eql("fake.rss.service");
      expect(myListener.customfields).to.eql({
        description: ["media:group", "media:description"],
        icon: ["media:group", "media:thumbnail"],
      });
      expect(myListener.parser)
        .to.have.property("options")
        .to.have.property("customFields")
        .to.be.eql({
          feed: [],
          item: ["media:group", "media:group"],
        });
      expect(myListener.lastEntriesLinks).to.be.eql([]);
    });

    it("builds with 1 params (only address)", function () {
      const myListener = new ListenerRss({
        address: "fake.rss.service",
      });

      // assertions
      // myListener data
      expect(myListener.timeloop).to.eql(5 * 60);
      expect(myListener.address).to.eql("fake.rss.service");
      expect(myListener.customfields).to.eql(undefined);
      expect(myListener.parser)
        .to.have.property("options")
        .to.have.property("customFields")
        .to.be.eql({
          feed: [],
          item: [],
        });
      expect(myListener.lastEntriesLinks).to.be.eql([]);
    });
  });

  describe("export property", function () {
    it("should export properties into a ListenerRSSInfos", function () {
      // given
      const myListener = new ListenerRss(infosListener);

      // assertions
      expect(myListener.getProperty()).to.be.eql(infosListener);
    });
  });

  describe("data fetching", function () {
    it("fetches without issues", async function () {
      // given
      const mockManager: InPlaceMockManager<Parser> = ImportMock.mockClassInPlace<Parser>(
        Parser
      );
      const stubParser = mockManager.mock("parseURL");
      stubParser.resolves(mockedRSSOutput);

      const myListener = new ListenerRss(infosListener);

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

      // then
      expect(stubParser).to.have.been.calledOnce;
      expect(stubParser).to.have.been.calledWith(infosListener.address);
      expect(res).to.be.eql(mockedRSSOutput);
    });

    it("rejects when fetching fails", async function () {
      // given
      const mockManager: InPlaceMockManager<Parser> = ImportMock.mockClassInPlace<Parser>(
        Parser
      );
      const stubParser = mockManager.mock("parseURL");
      const err = new Error("connect ECONNREFUSED 127.0.0.1:80");
      stubParser.rejects(err);

      const myListener = new ListenerRss({
        address: "bad.rss.service",
        customfields: {
          description: ["media:group", "media:description"],
          icon: ["media:group", "media:thumbnail"],
        },
      });
      // when
      await assert.rejects(() => myListener.fetchRSS(), err);
    });
  });

  describe("start", function () {
    it("fetches immediately the RSS information", async function () {
      // given
      const clock = sinon.useFakeTimers();

      const mockManager: InPlaceMockManager<Parser> = ImportMock.mockClassInPlace<Parser>(
        Parser
      );
      const stubParser = mockManager.mock("parseURL");
      stubParser.resolves(mockedRSSOutput);

      // classic build
      const myListener = new ListenerRss(infosListener);

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

      // start timer
      myListener.on("update", updateListenerSpy);

      myListener.start();

      // when
      await clock.tickAsync(1);

      // then
      expect(updateListenerSpy).to.have.been.calledOnce;
      expect(updateListenerSpy).to.have.been.calledWith(mockedRSSOutput);
      expect(stubParser).to.have.calledWith(myListener.address);
      myListener.stop();
    });

    it("has fetched multiple times after a while", async function () {
      // given
      const clock = sinon.useFakeTimers();

      const mockManager: InPlaceMockManager<Parser> = ImportMock.mockClassInPlace<Parser>(
        Parser
      );
      const stubParser = mockManager.mock("parseURL");
      stubParser.resolves(mockedRSSOutput);

      // classic build
      const myListener = new ListenerRss({
        ...infosListener,
        timeloop: 15,
      });

      //spy
      const updateListenerSpy: sinon.SinonSpy = sinon.spy();
      const newRSSOutput = {
        ...mockedRSSOutput,
        items: mockedRSSOutput.items.concat({
          title: "my title 03",
          "media:group": {
            "media:description": "my description 03",
            "media:thumbnail": [
              { $: { height: 360, width: 420, url: "my_image03.jpg" } },
            ],
          },
          link: "my_url_03.com",
          pubDate: "myDate03",
        }),
      };

      // start timer
      myListener.on("update", updateListenerSpy);

      myListener.start();

      // when
      await clock.tickAsync(1);
      stubParser.resolves(newRSSOutput);
      await clock.tickAsync(60000);

      // then
      expect(updateListenerSpy).to.have.been.callCount(5);
      expect(updateListenerSpy.firstCall).to.have.been.calledWith(
        mockedRSSOutput
      );
      expect(updateListenerSpy.secondCall).to.have.been.calledWith(
        newRSSOutput
      );

      myListener.stop();
    });

    it("notifies with a 'error' when fetching fails", async function () {
      const clock = sinon.useFakeTimers();

      const mockManager: InPlaceMockManager<Parser> = ImportMock.mockClassInPlace<Parser>(
        Parser
      );
      const stubParser = mockManager.mock("parseURL");
      const expectedErr = new Error("connect ECONNREFUSED 127.0.0.1:80");
      stubParser.rejects(expectedErr);

      // classic build
      const myListener = new ListenerRss({
        ...infosListener,
        timeloop: 60,
      });

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

      myListener.on("error", updateErrorListenerSpy);
      myListener.on("update", updateListenerSpy);

      // start timer
      myListener.start();

      // wait and assertion
      // After 1ms
      await clock.tickAsync(1);
      expect(updateErrorListenerSpy).to.have.been.calledOnce;
      expect(updateListenerSpy).to.not.have.been.called;
      expect(updateErrorListenerSpy).to.have.been.calledWith(expectedErr);

      // After 60s
      await clock.tickAsync(60000);
      expect(updateErrorListenerSpy).to.have.been.calledTwice;
      expect(updateListenerSpy).to.not.have.been.called;

      // When the service is back
      stubParser.resolves(mockedRSSOutput);
      await clock.tickAsync(60000);

      expect(updateListenerSpy).to.have.been.calledOnce;
      expect(updateListenerSpy).to.have.been.calledWith(mockedRSSOutput);

      myListener.stop();
    });

    it("notifies with 'newEntries' when a new entry is detected", async function () {
      // given
      const clock = sinon.useFakeTimers();

      const mockManager = ImportMock.mockClassInPlace<Parser>(Parser);
      const stubParser = mockManager.mock("parseURL");
      stubParser.resolves(mockedRSSOutput);
      const newEntry = {
        title: "my title 03",
        "media:group": {
          "media:description": "my description 03",
          "media:thumbnail": [
            { $: { height: 360, width: 420, url: "my_image03.jpg" } },
          ],
        },
        link: "my_url_03.com",
        pubDate: "myDate03",
      };
      const newRSSOutput = {
        ...mockedRSSOutput,
        items: [newEntry, ...mockedRSSOutput.items],
      };

      // classic build
      const myListener = new ListenerRss({
        ...infosListener,
        timeloop: 60,
      });

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

      myListener.on("update", updateListenerSpy);
      myListener.on("newEntries", newEntriesListenerSpy);

      // when
      myListener.start();

      // then
      await clock.tickAsync(1);
      expect(updateListenerSpy).to.have.been.calledOnce;
      expect(newEntriesListenerSpy).to.not.have.been.called;

      // given
      stubParser.resolves(newRSSOutput);

      // then
      await clock.tickAsync(60000);
      expect(updateListenerSpy).to.have.been.calledTwice;
      expect(newEntriesListenerSpy).to.have.been.calledOnce;
      expect(newEntriesListenerSpy).to.have.been.calledWith([newEntry]);

      // given
      newEntriesListenerSpy.resetHistory();

      // then
      await clock.tickAsync(60000);
      expect(updateListenerSpy).to.have.been.calledThrice;
      expect(updateListenerSpy).to.have.been.calledWith(mockedRSSOutput);
      expect(newEntriesListenerSpy).to.not.have.been.called;

      myListener.stop();
    });

    it("not notifies with 'newEntries' when a new entry is detected but she's already in the history", async function () {
      // given
      const clock = sinon.useFakeTimers();

      const mockManager = ImportMock.mockClassInPlace<Parser>(Parser);
      const stubParser = mockManager.mock("parseURL");
      stubParser.resolves(mockedRSSOutput);
      const newEntry = {
        title: "my title 03",
        "media:group": {
          "media:description": "my description 03",
          "media:thumbnail": [
            { $: { height: 360, width: 420, url: "my_image03.jpg" } },
          ],
        },
        link: "my_url_03.com",
        pubDate: "myDate03",
      };
      const newRSSOutput = {
        ...mockedRSSOutput,
        items: [newEntry, ...mockedRSSOutput.items],
      };

      // classic build
      const myListener = new ListenerRss({
        ...infosListener,
        timeloop: 60,
        lastEntriesLinks: ["my_url_02.com", "my_url_01.com", "my_url_00.com"],
      });

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

      myListener.on("update", updateListenerSpy);
      myListener.on("newEntries", newEntriesListenerSpy);

      // when
      myListener.start();

      // then
      await clock.tickAsync(1);
      expect(updateListenerSpy).to.have.been.calledOnce;
      expect(newEntriesListenerSpy).to.not.have.been.calledOnce;

      // given
      stubParser.resolves(newRSSOutput);

      // then
      await clock.tickAsync(60000);
      expect(updateListenerSpy).to.have.been.calledTwice;
      expect(newEntriesListenerSpy).to.have.been.calledOnce;
      expect(newEntriesListenerSpy).to.have.been.calledWith([newEntry]);

      // given
      newEntriesListenerSpy.resetHistory();

      // then
      await clock.tickAsync(60000);
      expect(updateListenerSpy).to.have.been.calledThrice;
      expect(updateListenerSpy).to.have.been.calledWith(mockedRSSOutput);
      expect(newEntriesListenerSpy).to.not.have.been.called;

      myListener.stop();
    });
  });
});