import { TestBed, inject } from '@angular/core/testing';

import { DiffService, ModificationType } from './diff.service';
import { LinenumberingService } from './linenumbering.service';

describe('DiffService', () => {
    const brMarkup = (no: number): string => {
        return (
            '<br class="os-line-break">' +
            '<span class="line-number-' +
            no.toString() +
            ' os-line-number" contenteditable="false" data-line-number="' +
            no +
            '">&nbsp;</span>'
        );
    };
    const noMarkup = (no: number): string => {
        return (
            '<span class="line-number-' +
            no.toString() +
            ' os-line-number" contenteditable="false" data-line-number="' +
            no +
            '">&nbsp;</span>'
        );
    };

    const baseHtml1 =
        '<p>' +
        noMarkup(1) +
        'Line 1 ' +
        brMarkup(2) +
        'Line 2 ' +
        brMarkup(3) +
        'Line <strong>3<br>' +
        noMarkup(4) +
        'Line 4 ' +
        brMarkup(5) +
        'Line</strong> 5</p>' +
        '<ul class="ul-class">' +
        '<li class="li-class">' +
        noMarkup(6) +
        'Line 6 ' +
        brMarkup(7) +
        'Line 7' +
        '</li>' +
        '<li class="li-class"><ul>' +
        '<li>' +
        noMarkup(8) +
        'Level 2 LI 8</li>' +
        '<li>' +
        noMarkup(9) +
        'Level 2 LI 9</li>' +
        '</ul></li>' +
        '</ul>' +
        '<p>' +
        noMarkup(10) +
        'Line 10 ' +
        brMarkup(11) +
        'Line 11</p>';
    let baseHtmlDom1: DocumentFragment;

    const baseHtml2 =
        '<p>' +
        noMarkup(1) +
        'Single text line</p>\
<p>' +
        noMarkup(2) +
        'sdfsdfsdfsdf dsfsdfsdfdsflkewjrl ksjfl ksdjf&nbsp;klnlkjBavaria ipsum dolor sit amet Biazelt Auffisteign ' +
        brMarkup(3) +
        'Schorsch mim Radl foahn Ohrwaschl Steckerleis wann griagd ma nacha wos z’dringa glacht Mamalad, ' +
        brMarkup(4) +
        'muass? I bin a woschechta Bayer sowos oamoi und sei und glei wirds no fui lustiga: Jo mei khkhis des ' +
        brMarkup(5) +
        'schee middn ognudelt, Trachtnhuat Biawambn gscheid: Griasd eich midnand etza nix Gwiass woass ma ned ' +
        brMarkup(6) +
        'owe. Dahoam gscheckate middn Spuiratz des is a gmahde Wiesn. Des is schee so Obazda san da, Haferl ' +
        brMarkup(7) +
        'pfenningguat schoo griasd eich midnand.</p>\
<ul>\
<li>' +
        noMarkup(8) +
        'Auffi Gamsbart nimma de Sepp Ledahosn Ohrwaschl um Godds wujn Wiesn Deandlgwand Mongdratzal! Jo ' +
        brMarkup(9) +
        'leck mi Mamalad i daad mechad?</li>\
<li>' +
        noMarkup(10) +
        'Do nackata Wurscht i hob di narrisch gean, Diandldrahn Deandlgwand vui huift vui woaß?</li>\
<li>' +
        noMarkup(11) +
        'Ned Mamalad auffi i bin a woschechta Bayer greaßt eich nachad, umananda gwiss nia need ' +
        brMarkup(12) +
        'Weiznglasl.</li>\
<li>' +
        noMarkup(13) +
        'Woibbadinga noch da Giasinga Heiwog Biazelt mechad mim Spuiratz, soi zwoa.</li>\
</ul>\
<p>' +
        noMarkup(14) +
        'I waar soweid Blosmusi es nomoi. Broadwurschtbudn des is a gmahde Wiesn Kirwa mogsd a Bussal ' +
        brMarkup(15) +
        'Guglhupf schüds nei. Luja i moan oiwei Baamwach Watschnbaam, wiavui baddscher! Biakriagal a fescha ' +
        brMarkup(16) +
        '1Bua Semmlkneedl iabaroi oba um Godds wujn Ledahosn wui Greichats. Geh um Godds wujn luja heid ' +
        brMarkup(17) +
        'greaßt eich nachad woaß Breihaus eam! De om auf’n Gipfe auf gehds beim Schichtl mehra Baamwach a ' +
        brMarkup(18) +
        'bissal wos gehd ollaweil gscheid:</p>\
<blockquote>\
<p>' +
        noMarkup(19) +
        'Scheans Schdarmbeaga See i hob di narrisch gean i jo mei is des schee! Nia eam ' +
        brMarkup(20) +
        'hod vasteh i sog ja nix, i red ja bloß sammawiedaguad, umma eana obandeln! Zwoa ' +
        brMarkup(21) +
        'jo mei scheans amoi, san und hoggd Milli barfuaßat gscheit. Foidweg vui huift ' +
        brMarkup(22) +
        'vui singan, mehra Biakriagal om auf’n Gipfe! Ozapfa sodala Charivari greaßt eich ' +
        brMarkup(23) +
        'nachad Broadwurschtbudn do middn liberalitas Bavariae sowos Leonhardifahrt:</p>\
</blockquote>\
<p>' +
        noMarkup(24) +
        'Wui helfgod Wiesn, ognudelt schaugn: Dahoam gelbe Rüam Schneid singan wo hi sauba i moan scho aa no ' +
        brMarkup(25) +
        'a Maß a Maß und no a Maß nimma. Is umananda a ganze Hoiwe zwoa, Schneid. Vui huift vui Brodzeid kumm ' +
        brMarkup(26) +
        'geh naa i daad vo de allerweil, gor. Woaß wia Gams, damischa. A ganze Hoiwe Ohrwaschl Greichats ' +
        brMarkup(27) +
        'iabaroi Prosd Engelgwand nix Reiwadatschi.Weibaleid ognudelt Ledahosn noch da Giasinga Heiwog i daad ' +
        brMarkup(28) +
        'Almrausch, Ewig und drei Dog nackata wea ko, dea ko. Meidromml Graudwiggal nois dei, nackata. No ' +
        brMarkup(29) +
        'Diandldrahn nix Gwiass woass ma ned hod boarischer: Samma sammawiedaguad wos, i hoam Brodzeid. Jo ' +
        brMarkup(30) +
        'mei Sepp Gaudi, is ma Wuascht do Hendl Xaver Prosd eana an a bravs. Sauwedda an Brezn, abfieseln.</p>';
    let baseHtmlDom2: DocumentFragment;

    const baseHtml3 =
        '<ol>' +
        '<li>' +
        noMarkup(1) +
        'Line 1</li>' +
        '<li>' +
        noMarkup(2) +
        'Line 2</li>' +
        '<li><ol>' +
        '<li>' +
        noMarkup(3) +
        'Line 3.1</li>' +
        '<li>' +
        noMarkup(4) +
        'Line 3.2</li>' +
        '<li>' +
        noMarkup(5) +
        'Line 3.3</li>' +
        '</ol></li>' +
        '<li>' +
        noMarkup(6) +
        ' Line 4</li></ol>';

    beforeAll(inject([DiffService], (service: DiffService) => {
        baseHtmlDom1 = service.htmlToFragment(baseHtml1);
        baseHtmlDom2 = service.htmlToFragment(baseHtml2);
        service.insertInternalLineMarkers(baseHtmlDom1);
        service.insertInternalLineMarkers(baseHtmlDom2);
    }));

    beforeEach(() => {
        TestBed.configureTestingModule({
            providers: [DiffService]
        });
    });

    describe('extraction of lines', () => {
        it('locates line number nodes', inject([DiffService], (service: DiffService) => {
            let lineNumberNode = service.getLineNumberNode(baseHtmlDom1, 4);
            expect(lineNumberNode.parentNode.nodeName).toBe('STRONG');

            lineNumberNode = service.getLineNumberNode(baseHtmlDom1, 9);
            expect(lineNumberNode.parentNode.nodeName).toBe('UL');

            lineNumberNode = service.getLineNumberNode(baseHtmlDom1, 15);
            expect(lineNumberNode).toBe(null);
        }));

        it('finds the common ancestor', inject([DiffService], (service: DiffService) => {
            let fromLineNode, toLineNode, commonAncestor;

            fromLineNode = service.getLineNumberNode(baseHtmlDom1, 6);
            toLineNode = service.getLineNumberNode(baseHtmlDom1, 7);
            commonAncestor = service.getCommonAncestor(fromLineNode, toLineNode);
            expect(commonAncestor.commonAncestor.nodeName).toBe('#document-fragment');

            fromLineNode = service.getLineNumberNode(baseHtmlDom1, 6);
            toLineNode = service.getLineNumberNode(baseHtmlDom1, 8);
            commonAncestor = service.getCommonAncestor(fromLineNode, toLineNode);
            expect(commonAncestor.commonAncestor.nodeName).toBe('#document-fragment');

            fromLineNode = service.getLineNumberNode(baseHtmlDom1, 6);
            toLineNode = service.getLineNumberNode(baseHtmlDom1, 10);
            commonAncestor = service.getCommonAncestor(fromLineNode, toLineNode);
            expect(commonAncestor.commonAncestor.nodeName).toBe('#document-fragment');
        }));

        it('renders DOMs correctly (1)', inject([DiffService], (service: DiffService) => {
            const lineNo = service.getLineNumberNode(baseHtmlDom1, 7),
                greatParent = lineNo.parentNode.parentNode;
            let lineTrace = [lineNo.parentNode, lineNo];

            const pre = service.serializePartialDomToChild(greatParent, lineTrace, true);
            expect(pre).toBe('<UL class="ul-class"><LI class="li-class">Line 6 ');

            lineTrace = [lineNo.parentNode, lineNo];
            const post = service.serializePartialDomFromChild(greatParent, lineTrace, true);
            expect(post).toBe(
                'Line 7' +
                    '</LI>' +
                    '<LI class="li-class"><UL>' +
                    '<LI>Level 2 LI 8</LI>' +
                    '<LI>Level 2 LI 9</LI>' +
                    '</UL></LI>' +
                    '</UL>'
            );
        }));

        it('renders DOMs correctly (2)', inject([DiffService], (service: DiffService) => {
            const lineNo = service.getLineNumberNode(baseHtmlDom1, 9),
                greatParent = lineNo.parentNode.parentNode,
                lineTrace = [lineNo.parentNode, lineNo];

            const pre = service.serializePartialDomToChild(greatParent, lineTrace, true);
            expect(pre).toBe('<LI class="li-class"><UL><LI>Level 2 LI 8</LI>');
        }));

        it('extracts a single line', inject([DiffService], (service: DiffService) => {
            const diff = service.extractRangeByLineNumbers(baseHtml1, 1, 2);
            expect(diff.html).toBe('<P class="os-split-after">Line 1 ');
            expect(diff.outerContextStart).toBe('');
            expect(diff.outerContextEnd).toBe('');
        }));

        it('extracts lines from nested UL/LI-structures', inject([DiffService], (service: DiffService) => {
            const diff = service.extractRangeByLineNumbers(baseHtml1, 7, 9);
            expect(diff.html).toBe(
                'Line 7</LI><LI class="li-class os-split-after"><UL class="os-split-after"><LI>Level 2 LI 8</LI>'
            );
            expect(diff.ancestor.nodeName).toBe('UL');
            expect(diff.outerContextStart).toBe('<UL class="ul-class os-split-before os-split-after">');
            expect(diff.outerContextEnd).toBe('</UL>');
            expect(diff.innerContextStart).toBe('<LI class="li-class os-split-before">');
            expect(diff.innerContextEnd).toBe('</UL></LI>');
            expect(diff.previousHtmlEndSnippet).toBe('</LI></UL>');
            expect(diff.followingHtmlStartSnippet).toBe(
                '<UL class="ul-class os-split-before os-split-after"><LI class="li-class os-split-after"><UL class="os-split-after">'
            );
        }));

        it('extracts lines from double-nested UL/LI-structures (1)', inject([DiffService], (service: DiffService) => {
            const html =
                '<p>' +
                noMarkup(1) +
                'Line 1</p>' +
                '<ul><li><p>' +
                noMarkup(2) +
                'Line 2' +
                brMarkup(3) +
                'Line 3' +
                brMarkup(4) +
                'Line 5</p></li></ul>';
            const diff = service.extractRangeByLineNumbers(html, 3, 4);
            expect(diff.html).toBe('Line 3');
            expect(diff.ancestor.nodeName).toBe('P');
            expect(diff.outerContextStart).toBe(
                '<UL class="os-split-before os-split-after"><LI class="os-split-before os-split-after"><P class="os-split-before os-split-after">'
            );
            expect(diff.outerContextEnd).toBe('</P></LI></UL>');
            expect(diff.innerContextStart).toBe('');
            expect(diff.innerContextEnd).toBe('');
            expect(diff.previousHtmlEndSnippet).toBe('</P></LI></UL>');
            expect(diff.followingHtmlStartSnippet).toBe(
                '<UL class="os-split-before os-split-after"><LI class="os-split-before os-split-after"><P class="os-split-before os-split-after">'
            );
        }));

        it('extracts lines from double-nested UL/LI-structures (2)', inject([DiffService], (service: DiffService) => {
            const html =
                '<p>' +
                noMarkup(1) +
                'Line 1</p>' +
                '<ul><li><p>' +
                noMarkup(2) +
                'Line 2' +
                brMarkup(3) +
                'Line 3' +
                brMarkup(4) +
                '</p></li></ul>';
            const diff = service.extractRangeByLineNumbers(html, 2, 3);
            expect(diff.html).toBe(
                '<UL class="os-split-after"><LI class="os-split-after"><P class="os-split-after">Line 2'
            );
            expect(diff.outerContextStart).toBe('');
            expect(diff.outerContextEnd).toBe('');
            expect(diff.innerContextStart).toBe('');
            expect(diff.innerContextEnd).toBe('</P></LI></UL>');
            expect(diff.previousHtmlEndSnippet).toBe('');

            // @TODO in followingHtmlStartSnippet, os-split-li is not set yet in this case.
            // This is not entirely correct, but as this field is never actually used, it's not bothering (yet)
            // This comment remains to document a potential pitfall in the future
            // expect(diff.followingHtmlStartSnippet).toBe('<UL><LI class="os-split-li"><P>');
        }));

        it('extracts a single line right before a UL/LI', inject(
            [DiffService, LinenumberingService],
            (service: DiffService, lineNumbering: LinenumberingService) => {
                // Test case for https://github.com/OpenSlides/OpenSlides/issues/3226
                let html =
                    '<p>A line</p><p>Another line</p>\n<ul>\t<li>A list item</li>\t<li>Yet another item</li></ul>';
                html = lineNumbering.insertLineNumbers(html, 80);
                const diff = service.extractRangeByLineNumbers(html, 2, 3);
                expect(diff.html).toBe('<P>Another line</P>\n');
            }
        ));

        it('extracts lines from a more complex example', inject([DiffService], (service: DiffService) => {
            const diff = service.extractRangeByLineNumbers(baseHtml2, 6, 11);

            expect(diff.html).toBe(
                'owe. Dahoam gscheckate middn Spuiratz des is a gmahde Wiesn. Des is schee so Obazda san da, Haferl pfenningguat schoo griasd eich midnand.</P><UL class="os-split-after"><LI>Auffi Gamsbart nimma de Sepp Ledahosn Ohrwaschl um Godds wujn Wiesn Deandlgwand Mongdratzal! Jo leck mi Mamalad i daad mechad?</LI><LI>Do nackata Wurscht i hob di narrisch gean, Diandldrahn Deandlgwand vui huift vui woaß?</LI>'
            );
            expect(diff.ancestor.nodeName).toBe('#document-fragment');
            expect(diff.outerContextStart).toBe('');
            expect(diff.outerContextEnd).toBe('');
            expect(diff.innerContextStart).toBe('<P class="os-split-before">');
            expect(diff.innerContextEnd).toBe('</UL>');
            expect(diff.previousHtmlEndSnippet).toBe('</P>');
            expect(diff.followingHtmlStartSnippet).toBe('<UL class="os-split-after">');
        }));

        it('extracts the end of a section', inject([DiffService], (service: DiffService) => {
            const diff = service.extractRangeByLineNumbers(baseHtml2, 29, null);

            expect(diff.html).toBe(
                'Diandldrahn nix Gwiass woass ma ned hod boarischer: Samma sammawiedaguad wos, i hoam Brodzeid. Jo mei Sepp Gaudi, is ma Wuascht do Hendl Xaver Prosd eana an a bravs. Sauwedda an Brezn, abfieseln.</P>'
            );
            expect(diff.ancestor.nodeName).toBe('#document-fragment');
            expect(diff.outerContextStart).toBe('');
            expect(diff.outerContextEnd).toBe('');
            expect(diff.innerContextStart).toBe('<P class="os-split-before">');
            expect(diff.innerContextEnd).toBe('');
            expect(diff.previousHtmlEndSnippet).toBe('</P>');
            expect(diff.followingHtml).toBe('');
            expect(diff.followingHtmlStartSnippet).toBe('');
        }));

        it('preserves the numbering of OLs (1)', inject([DiffService], (service: DiffService) => {
            const diff = service.extractRangeByLineNumbers(baseHtml3, 5, 7);

            expect(diff.html).toBe('<LI>Line 3.3</LI></OL></LI><LI> Line 4</LI></OL>');
            expect(diff.ancestor.nodeName).toBe('#document-fragment');
            expect(diff.innerContextStart).toBe(
                '<OL class="os-split-before" start="3"><LI class="os-split-before"><OL class="os-split-before" start="3">'
            );
            expect(diff.innerContextEnd).toBe('');
            expect(diff.previousHtmlEndSnippet).toBe('</OL></LI></OL>');
        }));

        it('preserves the numbering of OLs (2)', inject([DiffService], (service: DiffService) => {
            const diff = service.extractRangeByLineNumbers(baseHtml3, 3, 5);

            expect(diff.html).toBe(
                '<LI class="os-split-after"><OL class="os-split-after"><LI>Line 3.1</LI><LI>Line 3.2</LI>'
            );
            expect(diff.ancestor.nodeName).toBe('OL');
            expect(diff.outerContextStart).toBe('<OL class="os-split-before os-split-after" start="3">');
            expect(diff.outerContextEnd).toBe('</OL>');
        }));

        it('escapes text resembling HTML-Tags', inject([DiffService], (service: DiffService) => {
            const inHtml =
                '<h2>' +
                noMarkup(1) +
                'Looks like a &lt;p&gt; tag &lt;/p&gt;</h2><p>' +
                noMarkup(2) +
                'Another line</p>';
            const diff = service.extractRangeByLineNumbers(inHtml, 1, 2);
            expect(diff.html).toBe('<H2>Looks like a &lt;p&gt; tag &lt;/p&gt;</H2>');
        }));

        it('marks split list items', inject([DiffService], (service: DiffService) => {
            const html =
                '<ol><li>' + noMarkup(1) + 'Line 1' + brMarkup(2) + 'Line 2' + brMarkup(3) + 'Line 3</li></ol>';
            let diff = service.extractRangeByLineNumbers(html, 2, 3);
            expect(diff.outerContextStart.toLowerCase()).toBe(
                '<ol class="os-split-before os-split-after" start="1"><li class="os-split-before os-split-after">'
            );

            diff = service.extractRangeByLineNumbers(html, 3, null);
            expect(diff.innerContextStart.toLowerCase()).toBe(
                '<ol class="os-split-before" start="1"><li class="os-split-before">'
            );
        }));

        it('does not mark the second list item as being split', inject([DiffService], (service: DiffService) => {
            const html =
                '<ol><li>' +
                noMarkup(1) +
                'Line 1</li><li>' +
                noMarkup(2) +
                'Line 2' +
                brMarkup(3) +
                'Line 3</li></ol>';
            const diff = service.extractRangeByLineNumbers(html, 2, 3);
            expect(diff.outerContextStart.toLowerCase()).toBe('<ol class="os-split-before os-split-after" start="2">');
            expect(diff.innerContextStart.toLowerCase()).toBe('');
            expect(diff.html.toLowerCase()).toBe('<li class="os-split-after">line 2');
        }));

        it('sets the start in a more complex list', inject([DiffService], (service: DiffService) => {
            const html =
                '<ol start="10"><li>' +
                noMarkup(1) +
                'Line 1</li><li>' +
                noMarkup(2) +
                'Line 2' +
                brMarkup(3) +
                'Line 3</li>' +
                '<li>' +
                noMarkup(4) +
                'Line 4</li></ol>';
            const diff = service.extractRangeByLineNumbers(html, 3, 4);
            expect(diff.previousHtml.toLowerCase()).toContain('start="10"');
            expect(diff.outerContextStart.toLowerCase()).toContain('start="11"');
            expect(diff.followingHtmlStartSnippet.toLowerCase()).toContain('start="12"');
        }));
    });

    describe('merging two sections', () => {
        it('merges OLs recursively, ignoring whitespaces between OL and LI', inject(
            [LinenumberingService, DiffService],
            (lineNumbering: LinenumberingService, service: DiffService) => {
                const node1 = document.createElement('DIV');
                node1.innerHTML = '<OL><LI><OL><LI>Punkt 4.1</LI><TEMPLATE></TEMPLATE></OL></LI> </OL>';
                const node2 = document.createElement('DIV');
                node2.innerHTML = '<OL> <LI>\
<OL start="2">\
 <LI>Punkt 4.2</LI>\
<LI>Punkt 4.3</LI>\
</OL></LI></OL>';
                const out = service.replaceLinesMergeNodeArrays([node1.childNodes[0]], [node2.childNodes[0]]);
                const outHtml = lineNumbering.nodesToHtml([<Element>out[0]]);
                expect(outHtml).toBe(
                    '<ol><li><ol><li>Punkt 4.1</li><li>Punkt 4.2</li><li>Punkt 4.3</li></ol></li></ol>'
                );
            }
        ));
    });

    describe('replacing lines in the original motion', () => {
        it('replaces LIs by a P', inject([DiffService], (service: DiffService) => {
            const merged = service.replaceLines(baseHtml1, '<p>Replaced a UL by a P</p>', 6, 9);
            expect(merged).toBe(
                '<P>Line 1 Line 2 Line <STRONG>3<BR>Line 4 Line</STRONG> 5</P><P>Replaced a UL by a P</P><UL class="ul-class"><LI class="li-class"><UL><LI>Level 2 LI 9</LI></UL></LI></UL><P>Line 10 Line 11</P>'
            );
        }));

        it('replaces LIs by another LI', inject([DiffService], (service: DiffService) => {
            const merged = service.replaceLines(baseHtml1, '<UL class="ul-class"><LI>A new LI</LI></UL>', 6, 9);
            expect(merged).toBe(
                '<P>Line 1 Line 2 Line <STRONG>3<BR>Line 4 Line</STRONG> 5</P><UL class="ul-class"><LI>A new LI<UL><LI>Level 2 LI 9</LI></UL></LI></UL><P>Line 10 Line 11</P>'
            );
        }));

        it('breaks up a paragraph into two', inject([DiffService], (service: DiffService) => {
            const merged = service.replaceLines(baseHtml1, '<P>Replaced Line 10</P><P>Inserted Line 11 </P>', 10, 11);
            expect(merged).toBe(
                '<P>Line 1 Line 2 Line <STRONG>3<BR>Line 4 Line</STRONG> 5</P><UL class="ul-class"><LI class="li-class">Line 6 Line 7</LI><LI class="li-class"><UL><LI>Level 2 LI 8</LI><LI>Level 2 LI 9</LI></UL></LI></UL><P>Replaced Line 10</P><P>Inserted Line 11 Line 11</P>'
            );
        }));

        it('does not accidently merge two separate words', inject([DiffService], (service: DiffService) => {
            const merged = service.replaceLines(baseHtml1, '<p>Line 1INSERTION</p>', 1, 2),
                containsError = merged.indexOf('Line 1INSERTIONLine 2'),
                containsCorrectVersion = merged.indexOf('Line 1INSERTION Line 2');
            expect(containsError).toBe(-1);
            expect(containsCorrectVersion).toBe(3);
        }));

        it('does not accidently merge two separate words, even in lists', inject(
            [DiffService],
            (service: DiffService) => {
                // The newlines between UL and LI are the problem here
                const merged = service.replaceLines(
                        baseHtml1,
                        '<ul class="ul-class">' + '\n' + '<li class="li-class">Line 6Inserted</li>' + '\n' + '</ul>',
                        6,
                        7
                    ),
                    containsError = merged.indexOf('Line 6InsertedLine 7'),
                    containsCorrectVersion = merged.indexOf('Line 6Inserted Line 7');
                expect(containsError).toBe(-1);
                expect(containsCorrectVersion > 0).toBe(true);
            }
        ));

        it('keeps ampersands escaped', inject([DiffService], (service: DiffService) => {
            const pre = '<p>' + noMarkup(1) + 'foo &amp; bar</p>',
                after = '<p>' + noMarkup(1) + 'foo &amp; bar ins</p>';
            const merged = service.replaceLines(pre, after, 1, 2);
            expect(merged).toBe('<P>foo &amp; bar ins</P>');
        }));
    });

    describe('detecting the type of change', () => {
        it('detects a simple insertion', inject([DiffService], (service: DiffService) => {
            const htmlBefore = '<p>Test 1</p>',
                htmlAfter = '<p>Test 1 Test 2</p>' + '\n' + '<p>Test 3</p>';
            const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
            expect(calculatedType).toBe(ModificationType.TYPE_INSERTION);
        }));

        it('detects a simple insertion, ignoring case of tags', inject([DiffService], (service: DiffService) => {
            const htmlBefore = '<p>Test 1</p>',
                htmlAfter = '<P>Test 1 Test 2</P>' + '\n' + '<P>Test 3</P>';
            const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
            expect(calculatedType).toBe(ModificationType.TYPE_INSERTION);
        }));

        it('detects a simple insertion, ignoring trailing whitespaces', inject(
            [DiffService],
            (service: DiffService) => {
                const htmlBefore = '<P>Lorem ipsum dolor sit amet, sed diam voluptua. At </P>',
                    htmlAfter = '<P>Lorem ipsum dolor sit amet, sed diam voluptua. At2</P>';
                const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
                expect(calculatedType).toBe(ModificationType.TYPE_INSERTION);
            }
        ));

        it('detects a simple insertion, ignoring spaces between UL and LI', inject(
            [DiffService],
            (service: DiffService) => {
                const htmlBefore = '<UL><LI>accusam et justo duo dolores et ea rebum.</LI></UL>',
                    htmlAfter =
                        '<UL>' + '\n' + '<LI>accusam et justo duo dolores et ea rebum 123.</LI>' + '\n' + '</UL>';
                const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
                expect(calculatedType).toBe(ModificationType.TYPE_INSERTION);
            }
        ));

        it('detects a simple insertion, despite &nbsp; tags', inject([DiffService], (service: DiffService) => {
            const htmlBefore = '<P>dsds dsfsdfsdf sdf sdfs dds sdf dsds dsfsdfsdf</P>',
                htmlAfter = '<P>dsds&nbsp;dsfsdfsdf sdf sdfs dds sd345 3453 45f dsds&nbsp;dsfsdfsdf</P>';
            const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
            expect(calculatedType).toBe(ModificationType.TYPE_INSERTION);
        }));

        it('detects a simple deletion', inject([DiffService], (service: DiffService) => {
            const htmlBefore = '<p>Test 1 Test 2</p>' + '\n' + '<p>Test 3</p>',
                htmlAfter = '<p>Test 1</p>';
            const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
            expect(calculatedType).toBe(ModificationType.TYPE_DELETION);
        }));

        it('detects a simple deletion, ignoring case of tags', inject([DiffService], (service: DiffService) => {
            const htmlBefore = '<p>Test 1 Test 2</p>' + '\n' + '<p>Test 3</p>',
                htmlAfter = '<P>Test 1</P>';
            const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
            expect(calculatedType).toBe(ModificationType.TYPE_DELETION);
        }));

        it('detects a simple deletion, ignoring trailing whitespaces', inject([DiffService], (service: DiffService) => {
            const htmlBefore = '<P>Lorem ipsum dolor sit amet, sed diam voluptua. At2</P>',
                htmlAfter = '<P>Lorem ipsum dolor sit amet, sed diam voluptua. At </P>';
            const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
            expect(calculatedType).toBe(ModificationType.TYPE_DELETION);
        }));

        it('detects a simple replacement', inject([DiffService], (service: DiffService) => {
            const htmlBefore = '<p>Test 1 Test 2</p>' + '\n' + '<p>Test 3</p>',
                htmlAfter = '<p>Test 1</p>' + '\n' + '<p>Test 2</p>' + '\n' + '<p>Test 3</p>';
            const calculatedType = service.detectReplacementType(htmlBefore, htmlAfter);
            expect(calculatedType).toBe(ModificationType.TYPE_REPLACEMENT);
        }));
    });

    describe('diff normalization', () => {
        it('uppercases normal HTML tags', inject([DiffService], (service: DiffService) => {
            const unnormalized = 'The <strong>brown</strong> fox',
                normalized = service.normalizeHtmlForDiff(unnormalized);
            expect(normalized).toBe('The <STRONG>brown</STRONG> fox');
        }));

        it('uppercases the names of html attributes, but not the values, and sort the attributes', inject(
            [DiffService],
            (service: DiffService) => {
                const unnormalized =
                        'This is our cool <a href="https://www.openslides.de/">home page</a> - have a look! ' +
                        '<input type="checkbox" checked title=\'A title with "s\'>',
                    normalized = service.normalizeHtmlForDiff(unnormalized);
                expect(normalized).toBe(
                    'This is our cool <A HREF="https://www.openslides.de/">home page</A> - have a look! ' +
                        '<INPUT CHECKED TITLE=\'A title with "s\' TYPE="checkbox">'
                );
            }
        ));

        it('strips unnecessary spaces', inject([DiffService], (service: DiffService) => {
            const unnormalized = '<ul> <li>Test</li>\n</ul>',
                normalized = service.normalizeHtmlForDiff(unnormalized);
            expect(normalized).toBe('<UL><LI>Test</LI></UL>');
        }));

        it('normalizes html entities', inject([DiffService], (service: DiffService) => {
            const unnormalized = 'German characters like &szlig; or &ouml;',
                normalized = service.normalizeHtmlForDiff(unnormalized);
            expect(normalized).toBe('German characters like ß or ö');
        }));

        it('sorts css classes', inject([DiffService], (service: DiffService) => {
            const unnormalized = "<P class='os-split-before os-split-after'>Test</P>",
                normalized = service.normalizeHtmlForDiff(unnormalized);
            expect(normalized).toBe("<P CLASS='os-split-after os-split-before'>Test</P>");
        }));

        it('treats newlines like spaces', inject([DiffService], (service: DiffService) => {
            const unnormalized = '<P>Test line\n\t 2</P>',
                normalized = service.normalizeHtmlForDiff(unnormalized);
            expect(normalized).toBe('<P>Test line 2</P>');
        }));
    });

    describe('the core diff algorithm', () => {
        it('acts as documented by the official documentation', inject([DiffService], (service: DiffService) => {
            const before = 'The red brown fox jumped over the rolling log.',
                after = 'The brown spotted fox leaped over the rolling log.';
            const diff = service.diff(before, after);
            expect(diff).toBe(
                'The <del>red </del>brown <ins>spotted </ins>fox <del>jum</del><ins>lea</ins>ped over the rolling log.'
            );
        }));

        it('ignores changing cases in HTML tags', inject([DiffService], (service: DiffService) => {
            const before = 'The <strong>brown</strong> spotted fox jumped over the rolling log.',
                after = 'The <STRONG>brown</STRONG> spotted fox leaped over the rolling log.';
            const diff = service.diff(before, after);

            expect(diff).toBe(
                'The <strong>brown</strong> spotted fox <del>jum</del><ins>lea</ins>ped over the rolling log.'
            );
        }));

        it('does not insert spaces after a unchanged BR tag', inject([DiffService], (service: DiffService) => {
            const before = '<p>' + noMarkup(1) + 'Hendl Kirwa hod Maßkruag<br>' + noMarkup(2) + 'gmahde Wiesn</p>',
                after = '<p>Hendl Kirwa hod Maßkruag<br>\ngmahde Wiesn</p>';
            const diff = service.diff(before, after);

            expect(diff).toBe(before);
        }));

        it('does not mark the last line of a paragraph as change if a long new one is appended', inject(
            [DiffService],
            (service: DiffService) => {
                const before =
                        '<p><span class="os-line-number line-number-5" data-line-number="5" contenteditable="false">&nbsp;</span>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</p>',
                    after =
                        '<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</p>\n' +
                        '\n' +
                        '<p>Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.</p>';
                const diff = service.diff(before, after);
                expect(diff).toBe(
                    '<p><span class="line-number-5 os-line-number" contenteditable="false" data-line-number="5">&nbsp;</span>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</p>\n' +
                        '<p><ins>Aenean commodo ligula eget dolor. Aenean massa. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec quam felis, ultricies nec, pellentesque eu, pretium quis, sem. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu. Nulla consequat massa quis enim. Donec pede justo, fringilla vel, aliquet nec, vulputate eget, arcu.</ins></p>'
                );
            }
        ));

        it('does not result in separate paragraphs when only the first word has changed', inject(
            [DiffService],
            (service: DiffService) => {
                const before =
                        '<p class="os-split-after"><span class="os-line-number line-number-1" data-line-number="1" contenteditable="false">&nbsp;</span>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor </p>',
                    after =
                        '<p class="os-split-after">Bla ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor</p>';
                const diff = service.diff(before, after);

                expect(diff).toBe(
                    '<p class="os-split-after"><span class="line-number-1 os-line-number" contenteditable="false" data-line-number="1">&nbsp;</span><del>Lorem</del><ins>Bla</ins> ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor</p>'
                );
            }
        ));

        it('merges multiple inserts and deletes', inject([DiffService], (service: DiffService) => {
            const before = 'Some additional text to circumvent the threshold Test1 Test2 Test3 Test4 Test5 Test9',
                after = 'Some additional text to circumvent the threshold Test1 Test6 Test7 Test8 Test9';
            const diff = service.diff(before, after);

            expect(diff).toBe(
                'Some additional text to circumvent the threshold Test1 <del>Test2 Test3 Test4 Test5</del><ins>Test6 Test7 Test8</ins> Test9'
            );
        }));

        it('detects insertions and deletions in a word (1)', inject([DiffService], (service: DiffService) => {
            const before = 'Test1 Test2 Test3 Test4 Test5 Test6 Test7',
                after = 'Test1 Test Test3 Test4addon Test5 Test6 Test7';
            const diff = service.diff(before, after);

            expect(diff).toBe('Test1 Test<del>2</del> Test3 Test4<ins>addon</ins> Test5 Test6 Test7');
        }));

        it('detects insertions and deletions in a word (2)', inject([DiffService], (service: DiffService) => {
            const before = 'Test Test',
                after = 'Test Testappend';
            const diff = service.diff(before, after);

            expect(diff).toBe('Test Test<ins>append</ins>');
        }));

        it('recognizes commas as a word separator', inject([DiffService], (service: DiffService) => {
            const before =
                    'Lorem ipsum dolor sit amet, consetetur sadipscing elitr sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat',
                after =
                    'Lorem ipsum dolor sit amet, consetetur sadipscing elitr, diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat';
            const diff = service.diff(before, after);

            expect(diff).toBe(
                'Lorem ipsum dolor sit amet, consetetur sadipscing elitr<del> sed</del><ins>,</ins> diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat'
            );
        }));

        it('cannot handle changing CSS-classes', inject([DiffService], (service: DiffService) => {
            const before = "<p class='p1'>Test1 Test2</p>",
                after = "<p class='p2'>Test1 Test2</p>";
            const diff = service.diff(before, after);

            expect(diff).toBe('<P class="p1 delete">Test1 Test2</P><P class="p2 insert">Test1 Test2</P>');
        }));

        it('handles inserted paragraphs', inject([DiffService], (service: DiffService) => {
            const before = "<P>liebliche Stimme, aber deine Stimme ist rauh; du bist der Wolf.' Da gieng der </P>",
                after =
                    "<p>liebliche Stimme, aber deine Stimme ist rauh; du bist der Wolf.'</p>\
\
<p>Der Wolf hatte danach richtig schlechte laune, trank eine Flasche Rum,</p>\
\
<p>machte eine Weltreise und kam danach wieder um die Ziegen zu fressen. Da ging der</p>",
                expected =
                    '<P class="delete">liebliche Stimme, aber deine Stimme ist rauh; du bist der Wolf.\' Da gieng der </P>' +
                    '<P class="insert">liebliche Stimme, aber deine Stimme ist rauh; du bist der Wolf.\'</P>' +
                    '<P class="insert">Der Wolf hatte danach richtig schlechte laune, trank eine Flasche Rum,</P>' +
                    '<P class="insert">machte eine Weltreise und kam danach wieder um die Ziegen zu fressen. Da ging der</P>';

            const diff = service.diff(before, after);
            expect(diff).toBe(expected);
        }));

        it('handles inserted paragraphs (2)', inject([DiffService], (service: DiffService) => {
            // Specifically, Noch</p> should not be enclosed by <ins>...</ins>, as <ins>Noch </p></ins> would be seriously broken
            const before =
                    "<P>rief sie alle sieben herbei und sprach 'liebe Kinder, ich will hinaus in den Wald, seid </P>",
                after =
                    "<p>rief sie alle sieben herbei und sprach 'liebe Kinder, ich will hinaus in den Wald, seid Noch</p>" +
                    '<p>Test 123</p>',
                expected =
                    "<p>rief sie alle sieben herbei und sprach 'liebe Kinder, ich will hinaus in den Wald, seid<ins> Noch</ins></p>" +
                    '<p><ins>Test 123</ins></p>';

            const diff = service.diff(before, after);
            expect(diff).toBe(expected);
        }));

        it('handles insterted paragraphs (3)', inject([DiffService], (service: DiffService) => {
            // Hint: os-split-after should be moved from the first paragraph to the second one
            const before =
                    '<p class="os-split-after"><span class="os-line-number line-number-1" data-line-number="1" contenteditable="false">&nbsp;</span>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, </p>',
                after =
                    '<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.</p>\n' +
                    '\n' +
                    '<p>Stet clita kasd gubergren, no sea takimata sanctus est.</p>',
                expected =
                    '<p><span class="line-number-1 os-line-number" contenteditable="false" data-line-number="1">&nbsp;</span>Lorem ipsum dolor sit amet, consetetur sadipscing elitr,<ins> sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum.</ins></p>\n' +
                    '<p class="os-split-after"><ins>Stet clita kasd gubergren, no sea takimata sanctus est.</ins></p>';

            const diff = service.diff(before, after);
            expect(diff).toBe(expected);
        }));

        it('handles inserted paragraphs (4)', inject([DiffService], (service: DiffService) => {
            const before = '<p>This is a random first line that remains unchanged.</p>',
                after =
                    '<p>This is a random first line that remains unchanged.</p>' +
                    '<p style="text-align: justify;"><span style="color: #000000;">Inserting this line should not make any troubles, especially not affect the first line</span></p>' +
                    '<p style="text-align: justify;"><span style="color: #000000;">Neither should this line</span></p>',
                expected =
                    '<p>This is a random first line that remains unchanged.</p>' +
                    '<p style="text-align: justify;"><ins><span style="color: #000000;">Inserting this line should not make any troubles, especially not affect the first line</span></ins></p>' +
                    '<p style="text-align: justify;"><ins><span style="color: #000000;">Neither should this line</span></ins></p>';

            const diff = service.diff(before, after);
            expect(diff).toBe(expected);
        }));

        it('handles completely deleted paragraphs', inject([DiffService], (service: DiffService) => {
            const before =
                    "<P>Ihr könnt ohne Sorge fortgehen.'Da meckerte die Alte und machte sich getrost auf den Weg.</P>",
                after = '';
            const diff = service.diff(before, after);
            expect(diff).toBe(
                '<P class="delete">Ihr könnt ohne Sorge fortgehen.\'Da meckerte die Alte und machte sich getrost auf den Weg.</P>'
            );
        }));

        it('does not repeat the last word (1)', inject([DiffService], (service: DiffService) => {
            const before = '<P>sem. Nulla consequat massa quis enim. </P>',
                after = '<p>sem. Nulla consequat massa quis enim. TEST<br>\nTEST</p>';
            const diff = service.diff(before, after);

            expect(diff).toBe('<p>sem. Nulla consequat massa quis enim.<ins> TEST<br>TEST</ins></p>');
        }));

        it('does not repeat the last word (2)', inject([DiffService], (service: DiffService) => {
            const before = '<P>...so frißt er Euch alle mit Haut und Haar.</P>',
                after = '<p>...so frißt er Euch alle mit Haut und Haar und Augen und Därme und alles.</p>';
            const diff = service.diff(before, after);

            expect(diff).toBe(
                '<p>...so frißt er Euch alle mit Haut und Haar<ins> und Augen und Därme und alles</ins>.</p>'
            );
        }));

        it('does not break when an insertion followes a beginning tag occuring twice', inject(
            [DiffService],
            (service: DiffService) => {
                const before = '<P>...so frißt er Euch alle mit Haut und Haar.</P>\n<p>Test</p>',
                    after =
                        '<p>Einfügung 1 ...so frißt er Euch alle mit Haut und Haar und Augen und Därme und alles.</p>\n<p>Test</p>';
                const diff = service.diff(before, after);

                expect(diff).toBe(
                    '<p><ins>Einfügung 1 </ins>...so frißt er Euch alle mit Haut und Haar<ins> und Augen und Därme und alles</ins>.</p>\n<p>Test</p>'
                );
            }
        ));

        it('does not lose formattings when multiple lines are deleted', inject(
            [DiffService],
            (service: DiffService) => {
                const before =
                        '<p>' +
                        noMarkup(13) +
                        'diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd ' +
                        brMarkup(14) +
                        'gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>',
                    after = '<p>Test</p>';
                const diff = service.diff(before, after).toLowerCase(),
                    expected =
                        '<p>' +
                        noMarkup(13) +
                        '<del>diam voluptua. at vero eos et accusam et justo duo dolores et ea rebum. stet clita kasd </del>' +
                        brMarkup(14) +
                        '<del>gubergren, no sea takimata sanctus est lorem ipsum dolor sit amet.</del>' +
                        '<ins>test</ins></p>';

                expect(diff).toBe(expected.toLowerCase());
            }
        ));

        it('removed inline colors in inserted/deleted parts (1)', inject([DiffService], (service: DiffService) => {
            const before = '<P>...so frißt er Euch alle mit Haut und Haar.</P>',
                after = "<P>...so frißt er <span style='color: #000000;'>Euch alle</span> mit Haut und Haar.</P>";
            const diff = service.diff(before, after);

            expect(diff).toBe(
                '<P class="delete">...so frißt er Euch alle mit Haut und Haar.</P><P class="insert">...so frißt er <SPAN>Euch alle</SPAN> mit Haut und Haar.</P>'
            );
        }));

        it('removed inline colors in inserted/deleted parts (2)', inject([DiffService], (service: DiffService) => {
            const before = '<P>...so frißt er Euch alle mit Haut und Haar.</P>',
                after =
                    "<P>...so frißt er <span style='font-size: 2em; color: #000000; opacity: 0.5'>Euch alle</span> mit Haut und Haar.</P>";
            const diff = service.diff(before, after);

            expect(diff).toBe(
                '<P class="delete">...so frißt er Euch alle mit Haut und Haar.</P><P class="insert">...so frißt er <SPAN style="font-size: 2em; opacity: 0.5">Euch alle</SPAN> mit Haut und Haar.</P>'
            );
        }));

        it('marks a single moved word as deleted and inserted again', inject([DiffService], (service: DiffService) => {
            const before =
                    '<p>tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren bla, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>',
                after =
                    '<p>tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd bla, no sea takimata sanctus est Lorem ipsum dolor gubergren sit amet.</p>';
            const diff = service.diff(before, after);

            expect(diff).toBe(
                '<p>tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd <del>gubergren </del>bla, no sea takimata sanctus est Lorem ipsum dolor <ins>gubergren </ins>sit amet.</p>'
            );
        }));

        it('works with style-tags in spans', inject([DiffService], (service: DiffService) => {
            const before =
                    '<p class="os-split-before os-split-after"><span class="os-line-number line-number-4" data-line-number="4" contenteditable="false">&nbsp;</span><span style="color: #0000ff;" class="os-split-before os-split-after">sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing </span></p>',
                after =
                    '<p class="os-split-after os-split-before"><span class="os-split-after os-split-before" style="color: #0000ff;">sanctus est Lorem ipsum dolor sit amet. Test Lorem ipsum dolor sit amet, consetetur sadipscing </span></p>';
            const diff = service.diff(before, after);

            expect(diff).toBe(
                '<p class="os-split-after os-split-before"><span class="line-number-4 os-line-number" contenteditable="false" data-line-number="4">&nbsp;</span><span class="os-split-after os-split-before" style="color: #0000ff;">sanctus est Lorem ipsum dolor sit amet. <ins>Test </ins>Lorem ipsum dolor sit amet, consetetur sadipscing </span></p>'
            );
        }));

        it('does not lose words when changes are moved X-wise', inject([DiffService], (service: DiffService) => {
            const before = 'elitr. einsetzt. VERSCHLUCKT noch die sog. Gleichbleibend (Wird gelöscht).',
                after = 'elitr, Einfügung durch Änderung der Gleichbleibend, einsetzt.';

            const diff = service.diff(before, after);
            expect(diff).toBe(
                'elitr<del>. einsetzt. VERSCHLUCKT noch die sog.</del><ins>, Einfügung durch Änderung der</ins> Gleichbleibend<del> (Wird gelöscht).</del><ins>, einsetzt.</ins>'
            );
        }));

        it('does not fall back to block level replacement when BRs are inserted/deleted', inject(
            [DiffService],
            (service: DiffService) => {
                const before =
                        '<p>Lorem ipsum dolor sit amet, consetetur <br>sadipscing elitr.<br>Bavaria ipsum dolor sit amet o’ha wea nia ausgähd<br>kummt nia hoam i hob di narrisch gean</p>',
                    after =
                        '<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr. Sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua..<br>\n' +
                        'Bavaria ipsum dolor sit amet o’ha wea nia ausgähd<br>\n' +
                        'Autonomie erfährt ihre Grenzen</p>';
                const diff = service.diff(before, after);
                expect(diff).toBe(
                    '<p>Lorem ipsum dolor sit amet, consetetur <del><br></del>sadipscing elitr.<ins> Sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua..</ins><br>Bavaria ipsum dolor sit amet o’ha wea nia ausgähd<br><del>kummt nia hoam i hob di narrisch gean</del><ins>Autonomie erfährt ihre Grenzen</ins></p>'
                );
            }
        ));

        it('does not a change in a very specific case', inject([DiffService], (service: DiffService) => {
            // See diff._fixWrongChangeDetection
            const inHtml =
                    '<p>Test 123<br>wir strikt ab. lehnen wir ' +
                    brMarkup(1486) +
                    'ab.<br>' +
                    noMarkup(1487) +
                    'Gegenüber</p>',
                outHtml = '<p>Test 123<br>\n' + 'wir strikt ab. lehnen wir ab.<br>\n' + 'Gegenüber</p>';
            const diff = service.diff(inHtml, outHtml);
            expect(diff).toBe(
                '<p>Test 123<br>wir strikt ab. lehnen wir ' +
                    brMarkup(1486) +
                    'ab.<br>' +
                    noMarkup(1487) +
                    'Gegenüber</p>'
            );
        }));
    });

    describe('ignoring line numbers', () => {
        it('works despite line numbers, part 1', inject(
            [DiffService, LinenumberingService],
            (service: DiffService, lineNumbering: LinenumberingService) => {
                let before = '<P>...so frißt er Euch alle mit Haut und Haar.</P>';
                const after = '<p>...so frißt er Euch alle mit Haut und Haar und Augen und Därme und alles.</p>';
                before = lineNumbering.insertLineNumbers(before, 15, null, null, 2);
                const diff = service.diff(before, after);

                expect(diff).toBe(
                    '<p>' +
                        noMarkup(2) +
                        '...so frißt er ' +
                        brMarkup(3) +
                        'Euch alle mit ' +
                        brMarkup(4) +
                        'Haut und Haar<ins> und Augen und Därme und alles</ins>.</p>'
                );
            }
        ));

        it('works with an inserted paragraph', inject(
            [DiffService, LinenumberingService],
            (service: DiffService, lineNumbering: LinenumberingService) => {
                let before =
                    '<P>their grammar, their pronunciation and their most common words. Everyone realizes why a </P>';
                const after =
                    '<P>their grammar, their pronunciation and their most common words. Everyone realizes why a</P>\n' +
                    '<P>NEW PARAGRAPH 2.</P>';

                before = lineNumbering.insertLineNumbers(before, 80, null, null, 2);
                const diff = service.diff(before, after);
                expect(diff).toBe(
                    '<p>' +
                        noMarkup(2) +
                        'their grammar, their pronunciation and their most common words. Everyone ' +
                        brMarkup(3) +
                        'realizes why a</p>\n' +
                        '<p><ins>NEW PARAGRAPH 2.</ins></p>'
                );
            }
        ));

        it('works with two inserted paragraphs', inject(
            [DiffService, LinenumberingService],
            (service: DiffService, lineNumbering: LinenumberingService) => {
                // Hint: If the last paragraph is a P again, the Diff still fails and falls back to paragraph-based diff
                // This leaves room for future improvements
                let before =
                    '<P>their grammar, their pronunciation and their most common words. Everyone realizes why a </P>\n<div>Go on</div>';
                const after =
                    '<P>their grammar, their pronunciation and their most common words. Everyone realizes why a</P>\n' +
                    '<P>NEW PARAGRAPH 1.</P>\n' +
                    '<P>NEW PARAGRAPH 2.</P>\n' +
                    '<div>Go on</div>';

                before = lineNumbering.insertLineNumbers(before, 80, null, null, 2);
                const diff = service.diff(before, after);
                expect(diff).toBe(
                    '<p>' +
                        noMarkup(2) +
                        'their grammar, their pronunciation and their most common words. Everyone ' +
                        brMarkup(3) +
                        'realizes why a</p>\n' +
                        '<p><ins>NEW PARAGRAPH 1.</ins></p>\n' +
                        '<p><ins>NEW PARAGRAPH 2.</ins></p>\n' +
                        '<div>' +
                        noMarkup(4) +
                        'Go on</div>'
                );
            }
        ));

        it('detects broken HTML and lowercases class names', inject([DiffService], (service: DiffService) => {
            const before =
                    '<p><span class="line-number-3 os-line-number" data-line-number="3" contenteditable="false">&nbsp;</span>holen, da rief sie alle sieben herbei und sprach:</p>\n\n<p><span class="line-number-4 os-line-number" data-line-number="4" contenteditable="false">&nbsp;</span><span style="color: #000000;">"Liebe Kinder, ich will hinaus in den Wald, seid auf der Hut vor dem Wolf! Wenn er <br class="os-line-break"><span class="line-number-5 os-line-number" data-line-number="5" contenteditable="false">&nbsp;</span>hereinkommt, frisst er euch alle mit Haut und Haar. Der Bösewicht verstellt sich oft, aber <br class="os-line-break"><span class="line-number-6 os-line-number" data-line-number="6" contenteditable="false">&nbsp;</span>an der rauen Stimme und an seinen schwarzen Füßen werdet ihr ihn schon erkennen."</span></p>\n\n<p><span class="line-number-7 os-line-number" data-line-number="7" contenteditable="false">&nbsp;</span>Die Geißlein sagten: " Liebe Mutter, wir wollen uns schon in acht nehmen, du kannst ohne </p>',
                after =
                    '<p>holen, da rief sie alle sieben herbei und sprach:</p>\n\n<p><span style="color: #000000;">Hello</span></p>\n\n<p><span style="color: #000000;">World</span></p>\n\n<p><span style="color: #000000;">Ya</span></p>\n\n<p>Die Geißlein sagten: " Liebe Mutter, wir wollen uns schon in acht nehmen, du kannst ohne</p>';
            const diff = service.diff(before, after);
            expect(diff).toBe(
                '<P class="delete"><SPAN class="line-number-3 os-line-number" data-line-number="3" contenteditable="false"> </SPAN>holen, da rief sie alle sieben herbei und sprach:</P><DEL>\n\n</DEL>' +
                    '<P class="delete"><SPAN class="line-number-4 os-line-number" data-line-number="4" contenteditable="false"> </SPAN><SPAN>"Liebe Kinder, ich will hinaus in den Wald, seid auf der Hut vor dem Wolf! Wenn er <BR class="os-line-break"><SPAN class="line-number-5 os-line-number" data-line-number="5" contenteditable="false"> </SPAN>hereinkommt, frisst er euch alle mit Haut und Haar. Der Bösewicht verstellt sich oft, aber <BR class="os-line-break"><SPAN class="line-number-6 os-line-number" data-line-number="6" contenteditable="false"> </SPAN>an der rauen Stimme und an seinen schwarzen Füßen werdet ihr ihn schon erkennen."</SPAN></P><DEL>\n\n</DEL><P class="delete"><SPAN class="line-number-7 os-line-number" data-line-number="7" contenteditable="false"> </SPAN>Die Geißlein sagten: " Liebe Mutter, wir wollen uns schon in acht nehmen, du kannst ohne </P>' +
                    '<P class="insert">holen, da rief sie alle sieben herbei und sprach:</P><INS>\n\n</INS>' +
                    '<P class="insert"><SPAN>Hello</SPAN></P><INS>\n\n</INS>' +
                    '<P class="insert"><SPAN>World</SPAN></P><INS>\n\n</INS>' +
                    '<P class="insert"><SPAN>Ya</SPAN></P><INS>\n\n</INS>' +
                    '<P class="insert">Die Geißlein sagten: " Liebe Mutter, wir wollen uns schon in acht nehmen, du kannst ohne</P>'
            );
        }));

        it('line breaks at dashes does not delete/insert the last/first word of the split lines', inject(
            [DiffService, LinenumberingService],
            (service: DiffService, lineNumbering: LinenumberingService) => {
                let before =
                    '<ul><li>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy ei rmodtem-Porinv idunt ut labore et dolore magna aliquyam erat, sed diam voluptua.</li></ul>';
                const after =
                    '<ul><li>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy ei rmodtem-Porinv idunt ut labore et dolore magna aliquyam erat, sed diam voluptua.</li></ul>';

                before = lineNumbering.insertLineNumbers(before, 90);
                const diff = service.diff(before, after);
                expect(diff).toBe(
                    '<ul><li>' +
                        noMarkup(1) +
                        'Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy ei rmodtem-' +
                        brMarkup(2) +
                        'Porinv idunt ut labore et dolore magna aliquyam erat, sed diam voluptua.</li></ul>'
                );
            }
        ));
    });

    describe('addCSSClassToFirstTag function', () => {
        it('works with plain tags', inject([DiffService], (service: DiffService) => {
            const strIn = "<ol start='2'><li>",
                inserted = service.addCSSClassToFirstTag(strIn, 'newClass');
            expect(inserted).toBe('<ol start=\'2\' class="newClass"><li>');
        }));

        it('works with tags already having classes', inject([DiffService], (service: DiffService) => {
            const strIn = "<ol start='2' class='my-old-class'><li>",
                inserted = service.addCSSClassToFirstTag(strIn, 'newClass');
            expect(inserted).toBe('<ol start=\'2\' class="my-old-class newClass"><li>');
        }));
    });

    describe('removeDuplicateClassesInsertedByCkeditor', () => {
        it('removes additional classes', inject([DiffService], (service: DiffService) => {
            const strIn =
                    '<ul class="os-split-before os-split-after"><li class="os-split-before"><ul class="os-split-before os-split-after"><li class="os-split-before">...here it goes on</li><li class="os-split-before">This has been added</li></ul></li></ul>',
                cleaned = service.removeDuplicateClassesInsertedByCkeditor(strIn);
            expect(cleaned).toBe(
                '<UL class="os-split-before os-split-after"><LI class="os-split-before"><UL class="os-split-before os-split-after"><LI class="os-split-before">...here it goes on</LI><LI>This has been added</LI></UL></LI></UL>'
            );
        }));
    });

    describe('detecting changed line number range', () => {
        it('detects changed line numbers in the middle', inject([DiffService], (service: DiffService) => {
            const before =
                    '<p>' +
                    noMarkup(1) +
                    'foo &amp; bar' +
                    brMarkup(2) +
                    'Another line' +
                    brMarkup(3) +
                    'This will be changed' +
                    brMarkup(4) +
                    'This, too' +
                    brMarkup(5) +
                    'End</p>',
                after =
                    '<p>' +
                    noMarkup(1) +
                    'foo &amp; bar' +
                    brMarkup(2) +
                    'Another line' +
                    brMarkup(3) +
                    'This has been changed' +
                    brMarkup(4) +
                    'End</p>';

            const diff = service.diff(before, after);
            const affected = service.detectAffectedLineRange(diff);
            expect(affected).toEqual({ from: 3, to: 5 });
        }));
        it('detects changed line numbers at the beginning', inject(
            [DiffService, LinenumberingService],
            (service: DiffService, lineNumbering: LinenumberingService) => {
                let before =
                    '<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat</p>';
                const after =
                    '<p>sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat</p>';

                before = lineNumbering.insertLineNumbers(before, 20);
                const diff = service.diff(before, after);

                const affected = service.detectAffectedLineRange(diff);
                expect(affected).toEqual({ from: 1, to: 2 });
            }
        ));
    });

    describe('stripping ins/del-styles/tags', () => {
        it('deletes to be deleted nodes', inject([DiffService], (service: DiffService) => {
            const inHtml =
                '<p>Test <span class="delete">Test 2</span> Another test <del>Test 3</del></p><p class="delete">Test 4</p>';
            const stripped = service.diffHtmlToFinalText(inHtml);
            expect(stripped).toBe('<P>Test  Another test </P>');
        }));

        it('produces empty paragraphs, if necessary', inject([DiffService], (service: DiffService) => {
            const inHtml =
                '<p class="delete">Test <span class="delete">Test 2</span> Another test <del>Test 3</del></p><p class="delete">Test 4</p>';
            const stripped = service.diffHtmlToFinalText(inHtml);
            expect(stripped).toBe('');
        }));

        it('Removes INS-tags', inject([DiffService], (service: DiffService) => {
            const inHtml = '<p>Test <ins>Test <strong>2</strong></ins> Another test</p>';
            const stripped = service.diffHtmlToFinalText(inHtml);
            expect(stripped).toBe('<P>Test Test <STRONG>2</STRONG> Another test</P>');
        }));

        it('Removes .insert-classes', inject([DiffService], (service: DiffService) => {
            const inHtml =
                '<p class="insert">Test <strong>1</strong></p><p class="insert anotherclass">Test <strong>2</strong></p>';
            const stripped = service.diffHtmlToFinalText(inHtml);
            expect(stripped).toBe('<P>Test <STRONG>1</STRONG></P><P class="anotherclass">Test <STRONG>2</STRONG></P>');
        }));
    });
});