import { NavigationPresenterImpl } from "../../../src/content/presenters/NavigationPresenter";
import { expect } from "chai";

describe("NavigationPresenterImpl", () => {
  let sut: NavigationPresenterImpl;

  const testRel = (done: () => void, rel: string, html: string) => {
    const method =
      rel === "prev" ? sut.openLinkPrev.bind(sut) : sut.openLinkNext.bind(sut);
    document.body.innerHTML = html;
    method();
    setTimeout(() => {
      expect(document.location.hash).to.equal(`#${rel}`);
      done();
    }, 0);
  };
  const testPrev = (html: string) => (done: () => void) =>
    testRel(done, "prev", html);
  const testNext = (html: string) => (done: () => void) =>
    testRel(done, "next", html);

  before(() => {
    sut = new NavigationPresenterImpl();
  });

  describe("#linkPrev", () => {
    it(
      'navigates to <link> elements whose rel attribute is "prev"',
      testPrev('<link rel="prev" href="#prev" />')
    );

    it(
      'navigates to <link> elements whose rel attribute starts with "prev"',
      testPrev('<link rel="prev bar" href="#prev" />')
    );

    it(
      'navigates to <link> elements whose rel attribute ends with "prev"',
      testPrev('<link rel="foo prev" href="#prev" />')
    );

    it(
      'navigates to <link> elements whose rel attribute contains "prev"',
      testPrev('<link rel="foo prev bar" href="#prev" />')
    );

    it(
      'navigates to <a> elements whose rel attribute is "prev"',
      testPrev('<a rel="prev" href="#prev">click me</a>')
    );

    it(
      'navigates to <a> elements whose rel attribute starts with "prev"',
      testPrev('<a rel="prev bar" href="#prev">click me</a>')
    );

    it(
      'navigates to <a> elements whose rel attribute ends with "prev"',
      testPrev('<a rel="foo prev" href="#prev">click me</a>')
    );

    it(
      'navigates to <a> elements whose rel attribute contains "prev"',
      testPrev('<a rel="foo prev bar" href="#prev">click me</a>')
    );

    it(
      'navigates to <a> elements whose text matches "prev"',
      testPrev('<a href="#dummy">preview</a><a href="#prev">go to prev</a>')
    );

    it(
      'navigates to <a> elements whose text matches "previous"',
      testPrev(
        '<a href="#dummy">previously</a><a href="#prev">previous page</a>'
      )
    );

    it(
      'navigates to <a> elements whose decoded text matches "<<"',
      testPrev('<a href="#dummy">click me</a><a href="#prev">&lt;&lt;</a>')
    );

    it(
      "navigates to matching <a> elements by clicking",
      testPrev(
        `<a rel="prev" href="#dummy" onclick="return location = '#prev', false">go to prev</a>`
      )
    );

    it(
      "prefers link[rel~=prev] to a[rel~=prev]",
      testPrev(
        '<a rel="prev" href="#dummy">click me</a><link rel="prev" href="#prev" />'
      )
    );

    it(
      "prefers a[rel~=prev] to a::text(pattern)",
      testPrev(
        '<a href="#dummy">go to prev</a><a rel="prev" href="#prev">click me</a>'
      )
    );
  });

  describe("#linkNext", () => {
    it(
      'navigates to <link> elements whose rel attribute is "next"',
      testNext('<link rel="next" href="#next" />')
    );

    it(
      'navigates to <link> elements whose rel attribute starts with "next"',
      testNext('<link rel="next bar" href="#next" />')
    );

    it(
      'navigates to <link> elements whose rel attribute ends with "next"',
      testNext('<link rel="foo next" href="#next" />')
    );

    it(
      'navigates to <link> elements whose rel attribute contains "next"',
      testNext('<link rel="foo next bar" href="#next" />')
    );

    it(
      'navigates to <a> elements whose rel attribute is "next"',
      testNext('<a rel="next" href="#next">click me</a>')
    );

    it(
      'navigates to <a> elements whose rel attribute starts with "next"',
      testNext('<a rel="next bar" href="#next">click me</a>')
    );

    it(
      'navigates to <a> elements whose rel attribute ends with "next"',
      testNext('<a rel="foo next" href="#next">click me</a>')
    );

    it(
      'navigates to <a> elements whose rel attribute contains "next"',
      testNext('<a rel="foo next bar" href="#next">click me</a>')
    );

    it(
      'navigates to <a> elements whose text matches "next"',
      testNext(
        '<a href="#dummy">inextricable</a><a href="#next">go to next</a>'
      )
    );

    it(
      'navigates to <a> elements whose decoded text matches ">>"',
      testNext('<a href="#dummy">click me</a><a href="#next">&gt;&gt;</a>')
    );

    it(
      "navigates to matching <a> elements by clicking",
      testNext(
        `<a rel="next" href="#dummy" onclick="return location = '#next', false">go to next</a>`
      )
    );

    it(
      "prefers link[rel~=next] to a[rel~=next]",
      testNext(
        '<a rel="next" href="#dummy">click me</a><link rel="next" href="#next" />'
      )
    );

    it(
      "prefers a[rel~=next] to a::text(pattern)",
      testNext(
        '<a href="#dummy">next page</a><a rel="next" href="#next">click me</a>'
      )
    );
  });
});