/**
 * @author Martin Karkowski
 * @email m.karkowski@zema.de
 * @create date 2021-11-13 08:17:19
 * @modify date 2021-11-13 09:44:51
 * @desc [description]
 */

import { assert } from "chai";
import "chai/register-should";
import { describe, it } from "mocha";
import { extractUniqueValues } from "./mapMethods";
import { MergeData } from "./mergedData";

describe("mergedData", function () {
  // Describe the required Test:
  it("data subscription", function (done) {
    const m = new Map<string, string>();
    const d = new MergeData(m, (m) => extractUniqueValues(m));
    m.set("a", "b");
    m.set("b", "b");

    d.update();

    d.data.subscribe((result) => {
      assert.isTrue(
        result.length === 1,
        "Elements have the same identity, but should be differend"
      );
      assert.isTrue([...result][0] === "b", "Element is element");
      done();
    });
  });

  it("data subscription. Update called twice", function (done) {
    const m = new Map<string, string>();
    const d = new MergeData(m, (m) => extractUniqueValues(m));
    m.set("a", "b");
    m.set("b", "b");
    d.update(m);
    d.data.subscribe((result) => {
      assert.isTrue(
        result.length === 1,
        "Elements have the same identity, but should be differend"
      );
      assert.isTrue([...result][0] === "b", "Element is element");
      done();
    });
    d.update(m);
  });

  it("onchange subscription: added", function (done) {
    const m = new Map<string, string>();
    const d = new MergeData(m, (m) => extractUniqueValues(m));
    m.set("a", "b");
    m.set("b", "b");

    d.onChange.subscribe((result) => {
      assert.isTrue(
        result.added.length === 1,
        "Elements have the same identity, but should be differend"
      );
      assert.isTrue([...result.added][0] === "b", "Element is element");
      done();
    });

    d.update(m);
  });

  it("onchange subscription: removed", function (done) {
    const m = new Map<string, string>();
    const d = new MergeData(m, (m) => extractUniqueValues(m));
    m.set("a", "b");
    m.set("b", "b");

    d.onChange.subscribe((result) => {
      assert.isTrue(
        result.removed.length === 0,
        "Elements have the same identity, but should be differend"
      );
      done();
    });

    d.update(m);
  });
});