// Copyright 2018 The Distill Template Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/* global it, describe, before, beforeEach, after, afterEach */

const jsdom = require('jsdom');
const { JSDOM } = jsdom;

const expect = require('chai').expect;
const distill = require('../dist/transforms.v2.js');

// omitJSDOMErrors as JSDOM routinely can't parse modern CSS
const virtualConsole = new jsdom.VirtualConsole();
virtualConsole.sendTo(console, { omitJSDOMErrors: true });
const options = { runScripts: 'outside-only', QuerySelector: true, virtualConsole: virtualConsole };

describe('Distill V2 (transforms)', function() {

  it('should export its expected interface', function() {
    expect(distill.testing).to.be.an('object');
    expect(distill.usesTemplateV2).to.be.a('function');
    expect(distill.render).to.be.a('function');
    expect(distill.distillify).to.be.a('function');
  });

  describe('#usesTemplateV2()', function() {

    it('should detect v1', function() {
      const frag = JSDOM.fragment('<script src="https://distill.pub/template.v1.js"></script>');
      expect(distill.usesTemplateV2(frag)).to.be.false;
    });

    it('should detect v2', function() {
      const frag = JSDOM.fragment('<script src="https://distill.pub/template.v2.js"></script>');
      expect(distill.usesTemplateV2(frag)).to.be.true;
    });

    it('should detect local scripts as well', function() {
      const frag = JSDOM.fragment('<script src="/template.v2.js"></script>');
      expect(distill.usesTemplateV2(frag)).to.be.true;
    });

    it('should error on unknown distill script', function() {
      const frag = JSDOM.fragment('<script src="https://distill.pub/template.v42.js"></script>');
      expect(()=> distill.usesTemplateV2(frag)).to.throw('unknown');
    });

    it('should error on no distill script', function() {
      const frag = JSDOM.fragment('<script src="https://code.jquery.com/jquery-3.2.1.js"></script>');
      expect(()=> distill.usesTemplateV2(frag)).to.throw('at all');
    });

  });

  describe('#render()', function() {

    describe('should extract metadata', function() {

      it('should extract citations', function() {
        const dom = new JSDOM('<d-cite key="test-citation-key">sth</d-cite>', options);
        const data = {};
        const extractCitations = distill.testing.extractors.get('ExtractCitations');
        expect(extractCitations).to.be.a('function');
        extractCitations(dom.window.document, data);
        expect(data).to.have.property('citations');
        const citations = data.citations;
        expect(citations).to.be.an.instanceof(Array);
        expect(citations).to.have.lengthOf(1);
        const citation = citations[0];
        expect(citation).to.equal('test-citation-key');
      });

      it('should extract bibliography', function() {
        const dom = new JSDOM(`
          <d-cite key="mercier2011humans">sth</d-cite>
          <d-bibliography>
            <script type="text/bibtex">
            @article{mercier2011humans,
            title={Why do humans reason? Arguments for an argumentative theory},
            author={Mercier, Hugo and Sperber, Dan},
            journal={Behavioral and brain sciences},
            volume={34},
            number={02},
            pages={57--74},
            year={2011},
            publisher={Cambridge Univ Press},
            doi={10.1017/S0140525X10000968}
            }
            </script>
          </d-bibliography>
          `, options);
        const data = {};
        const extractBibliography = distill.testing.extractors.get('ExtractBibliography');
        extractBibliography(dom.window.document, data);
        expect(data.bibliography).to.be.an.instanceof(Map);
        const entry = data.bibliography.get('mercier2011humans');
        expect(entry).to.be.an('object');
        expect(entry).to.have.property('year', '2011');
      });

      it('should extract front-matter');

    }); // metadata

    describe('should transform the DOM', function() {

      it('should add Google scholar citation information', function() {
        const dom = new JSDOM('', options);
        const data = {
          authors: [
            {firstName: 'Frank', lastName: 'Underwood', affiliation: 'Google Brain', affiliationURL: 'https://g.co/brain'},
            {firstName: 'Shan', lastName: 'Carter', affiliation: 'Google Brain', affiliationURL: 'https://g.co/brain'},
          ],
          doiSuffix: 'test-doi-suffix'
        };
        const firstAuthorName = data.authors[0].firstName + ' ' + data.authors[0].lastName;
        const GSfirstAuthorName = data.authors[0].lastName + ', ' + data.authors[0].firstName;

        const meta = distill.testing.transforms.get('Meta');
        expect(meta).to.be.a('function');

        meta(dom.window.document, data);
        const metaTags = dom.window.document.querySelectorAll('meta');
        expect(metaTags).to.not.be.empty;

        // Google Scholar
        const GSAuthorTags = Array.prototype.filter.call(metaTags, (tag) => {
          return tag.name === 'citation_author';
        });
        expect(GSAuthorTags).to.have.lengthOf(2);
        const GSFirstAuthorTag = GSAuthorTags[0];

        expect(GSFirstAuthorTag.content).to.equal(GSfirstAuthorName);

        // Schema.org Author tags
        const SOAuthorTags = Array.prototype.filter.call(metaTags, (tag) => {
          return tag.getAttribute('property') === 'article:author';
        });
        expect(SOAuthorTags).to.have.lengthOf(2);
        const SOFirstAuthorTag = SOAuthorTags[0];
        expect(SOFirstAuthorTag.content).to.equal(firstAuthorName);

      });

      it('given already correct data, it should add Google scholar references information', function() {
        const dom = new JSDOM('', options);
        const data = {
          doiSuffix: 'test-doi-suffix',
          citations: ['test-citation-key'],
          bibliography: new Map([[
            'test-citation-key', {
              title: 'Why do humans reason? Arguments for an argumentative theory',
              author: 'Mercier, Hugo and Sperber, Dan',
              journal: 'Behavioral and brain sciences',
              volume: 34,
              number: 2
            }
          ]])
        };
        const meta = distill.testing.transforms.get('Meta');
        expect(meta).to.be.a('function');
        meta(dom.window.document, data);
        const metaTags = [].slice.call(dom.window.document.querySelectorAll('meta[name="citation_reference"]'));
        expect(metaTags).to.not.be.empty;
      });

      it('given an arxiv article, it should add a special Google scholar arxiv citation', function() {
        const dom = new JSDOM('', options);
        const data = {
          doiSuffix: 'test-doi-suffix',
          citations: ['dumoulin2016guide'],
          bibliography: new Map([[
            'dumoulin2016guide', {
              title: 'A guide to convolution arithmetic for deep learning',
              author: 'Dumoulin, Vincent and Visin, Francesco',
              journal: 'arXiv preprint arXiv:1603.07285',
              year: '2016',
              url: 'https://arxiv.org/pdf/1603.07285.pdf'
            }
          ]])
        };

        const meta = distill.testing.transforms.get('Meta');
        expect(meta).to.be.a('function');
        meta(dom.window.document, data);

        const metaTags = [].slice.call(dom.window.document.querySelectorAll('meta[name="citation_reference"]'));
        expect(metaTags).to.not.be.empty;

        const metaTag = metaTags[0];
        expect(metaTag).to.have.property('content');

        const content = metaTag.content;
        expect(content).to.include('citation_title');
        expect(content).to.include('citation_author');
        expect(content.match(/citation_author=/g).length).to.equal(2);
        expect(content).to.include('citation_publication_date');
        expect(content).to.include('citation_arxiv_id');
        expect(content).to.not.include('journal');
      });

      it('given only a DOM (and publish data), it should add Google scholar references information', function() {
        const dom = new JSDOM(`
          <d-cite key="mercier2011humans">sth</d-cite>
          <d-bibliography>
            <script type="text/bibtex">
            @article{mercier2011humans,
            title={Why do humans reason? Arguments for an argumentative theory},
            author={Mercier, Hugo and Sperber, Dan},
            journal={Behavioral and brain sciences},
            volume={34},
            number={02},
            pages={57--74},
            year={2011},
            publisher={Cambridge Univ Press},
            doi={10.1017/S0140525X10000968}
            }
            </script>
          </d-bibliography>
          `, options);
        const data = { publishedDate: new Date(), updatedDate: new Date() };
        distill.render(dom.window.document, data, false);
        const metaTags = [].slice.call(dom.window.document.querySelectorAll('meta[name="citation_reference"]'));
        expect(metaTags).to.not.be.empty;
      });

    });

  }); // render

  it('should export #distillify()', function() {
    expect(distill.distillify).to.be.a('function');
  });

  describe('#distillify()', function() {

    it('should ensure existence of header');
    it('should ensure existence of footer');
    it('should ensure existence of distill appendix');

  });

}); // describe 'Transform'