package html

import (
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"net/url"
	"os"
	"regexp"
	"testing"

	"github.com/tdewolff/minify/v2"
	"github.com/tdewolff/minify/v2/css"
	"github.com/tdewolff/minify/v2/js"
	"github.com/tdewolff/minify/v2/json"
	"github.com/tdewolff/minify/v2/svg"
	"github.com/tdewolff/minify/v2/xml"
	"github.com/tdewolff/test"
)

func TestHTML(t *testing.T) {
	htmlTests := []struct {
		html     string
		expected string
	}{
		{`html`, `html`},
		{`<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd">`, `<!doctype html>`},
		{`<!-- comment -->`, ``},
		{`<style><!--\ncss\n--></style>`, `<style><!--\ncss\n--></style>`},
		{`<style>&</style>`, `<style>&</style>`},
		{`<html><head></head><body>x</body></html>`, `x`},
		{`<meta http-equiv="content-type" content="text/html; charset=utf-8">`, `<meta charset=utf-8>`},
		{`<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />`, `<meta charset=utf-8>`},
		{`<meta http-equiv=" content-type " content=" text/html;  charset=utf-8 ">`, `<meta charset=utf-8>`},
		{`<meta http-equiv="Content-Security-Policy" content="default-src 'self'; img-src https://*; child-src 'none';">`, `<meta http-equiv=content-security-policy content="default-src 'self'; img-src https://*; child-src 'none';">`},
		{`<meta name="keywords" content="a, b">`, `<meta name=keywords content="a,b">`},
		//{`<meta name="keywords" content=" a,  b ">`, `<meta name=keywords content="a,b">`}, // TODO
		{`<meta name="viewport" content="width = 996" />`, `<meta name=viewport content="width=996">`},
		{`<span attr="test"></span>`, `<span attr=test></span>`},
		{`<span attr='test&apos;test'></span>`, `<span attr="test'test"></span>`},
		{`<span attr="test&quot;test"></span>`, `<span attr='test"test'></span>`},
		{`<span attr='test""&apos;&amp;test'></span>`, `<span attr='test""&#39;&test'></span>`},
		{`<span attr="test/test"></span>`, `<span attr=test/test></span>`},
		{`<span attr="test/"></span>`, `<span attr=test/></span>`},
		{`<span>&amp;</span>`, `<span>&</span>`},
		{`<span>&lt;</span>`, `<span>&lt;</span>`},
		{`<span>&gt;</span>`, `<span>></span>`},
		{`<code>&quot;&rsquor;</code>`, `<code>"&#8217;</code>`},
		{`<small>&#160;</small>`, `<small>&#160;</small>`},
		{`<span name="&lt;&apos;">a</span>`, `<span name="<'">a</span>`},
		{`<span clear=none method=GET></span>`, `<span></span>`},
		{`<span onload="javascript:x;"></span>`, `<span onload=x;></span>`},
		{`<span selected="selected"></span>`, `<span selected></span>`},
		{`<noscript><html><img id="x"></noscript>`, `<noscript><img id=x></noscript>`},
		{`<body id="main"></body>`, `<body id=main>`},
		{`<link href="data:text/plain, data">`, `<link href=data:,+data>`},
		{`<svg width="100" height="100"><circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" /></svg>`, `<svg width="100" height="100"><circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" /></svg>`},
		{`</span >`, `</span>`},
		{`<meta name=viewport content="width=0.1, initial-scale=1.0 , maximum-scale=1000">`, `<meta name=viewport content="width=.1,initial-scale=1,maximum-scale=1e3">`},
		{`<br/>`, `<br>`},
		{`<input type="radio" value="">`, `<input type=radio value>`},
		{`<input type="radio" value="on">`, `<input type=radio>`},
		{`<input type="text" value="">`, `<input>`},

		// increase coverage
		{`<script style="css">js</script>`, `<script style=css>js</script>`},
		{`<script type="text/javascript">js</script>`, `<script>js</script>`},
		{`<script type="application/javascript">js</script>`, `<script>js</script>`},
		{`<meta http-equiv="content-type" content="text/plain, text/html">`, `<meta http-equiv=content-type content="text/plain,text/html">`},
		{`<meta property="rdfa" content="data">`, `<meta property="rdfa" content="data">`},
		{`<span attr=""></span>`, `<span attr></span>`},
		{`<code>x</code>`, `<code>x</code>`},
		{`<p></p><p></p>`, `<p><p>`},
		{`<ul><li></li> <li></li></ul>`, `<ul><li><li></ul>`},
		{`<p></p><a></a>`, `<p></p><a></a>`},
		{`<p></p>x<a></a>`, `<p></p>x<a></a>`},
		{`<span style=>`, `<span>`},
		{`<button onclick=>`, `<button>`},

		// whitespace
		{`cats  and 	dogs `, `cats and dogs`},
		{` <div> <i> test </i> <b> test </b> </div> `, `<div><i>test</i> <b>test</b></div>`},
		{`<strong>x </strong>y`, `<strong>x </strong>y`},
		{`<strong>x </strong> y`, `<strong>x</strong> y`},
		{"<strong>x </strong>\ny", "<strong>x</strong>\ny"},
		{`<p>x </p>y`, `<p>x</p>y`},
		{`x <p>y</p>`, `x<p>y`},
		{` <!doctype html> <!--comment--> <html> <body><p></p></body></html> `, `<!doctype html><p>`}, // spaces before html and at the start of html are dropped
		{`<p>x<br> y`, `<p>x<br>y`},
		{`<p>x </b> <b> y`, `<p>x</b> <b>y`},
		{`a <code></code> b`, `a <code></code>b`},
		{`a <code>code</code> b`, `a <code>code</code> b`},
		{`a <code> code </code> b`, `a <code>code</code> b`},
		{`a <script>script</script> b`, `a <script>script</script>b`},
		{"text\n<!--comment-->\ntext", "text\ntext"},
		{"abc\n</body>\ndef", "abc\ndef"},
		{"<x>\n<!--y-->\n</x>", "<x></x>"},
		{"a <template> b </template> c", "a <template>b</template>c"},
		{`<p class="  name  ">`, `<p class=name>`},
		{`<p onclick="  javascript:lala  ">`, `<p onclick=lala>`},
		{`<p url="  http://test  ">`, `<p url=http://test>`},

		// from HTML Minifier
		{`<DIV TITLE="blah">boo</DIV>`, `<div title=blah>boo</div>`},
		{"<p title\n\n\t  =\n     \"bar\">foo</p>", `<p title=bar>foo`},
		{`<p class=" foo      ">foo bar baz</p>`, `<p class=foo>foo bar baz`},
		{`<input maxlength="     5 ">`, `<input maxlength=5>`},
		{`<input type="text">`, `<input>`},
		{`<form method="get">`, `<form>`},
		{`<script language="Javascript">alert(1)</script>`, `<script>alert(1)</script>`},
		{`<script></script>`, ``},
		{`<p onclick=" JavaScript: x">x</p>`, `<p onclick=" x">x`},
		{`<span Selected="selected"></span>`, `<span selected></span>`},
		{`<table><thead><tr><th>foo</th><th>bar</th></tr></thead><tfoot><tr><th>baz</th><th>qux</th></tr></tfoot><tbody><tr><td>boo</td><td>moo</td></tr></tbody></table>`,
			`<table><thead><tr><th>foo<th>bar<tfoot><tr><th>baz<th>qux<tbody><tr><td>boo<td>moo</table>`},
		{`<select><option>foo</option><option>bar</option></select>`, `<select><option>foo<option>bar</select>`},
		{`<meta name="keywords" content="A, B">`, `<meta name=keywords content="A,B">`},
		{`<iframe><html> <p> x </p> </html></iframe>`, `<iframe><p>x</iframe>`},
		{`<math> &int;_a_^b^{f(x)<over>1+x} dx </math>`, `<math> &int;_a_^b^{f(x)<over>1+x} dx </math>`},
		{`<script language="x" charset="x" src="y"></script>`, `<script src=y></script>`},
		{`<style media="all">x</style>`, `<style>x</style>`},
		{`<a id="abc" name="abc">y</a>`, `<a id=abc>y</a>`},
		{`<a name="abc" id="abc">y</a>`, `<a id=abc>y</a>`},
		{`<a id="" value="">y</a>`, `<a value>y</a>`},

		// from Kangax html-minfier
		{`<span style="font-family:&quot;Helvetica Neue&quot;,&quot;Helvetica&quot;,Helvetica,Arial,sans-serif">text</span>`, `<span style='font-family:"Helvetica Neue","Helvetica",Helvetica,Arial,sans-serif'>text</span>`},

		// go-fuzz
		{`<meta e t n content=ful><a b`, `<meta e t n content="ful"><a b>`},
		{`<img alt=a'b="">`, `<img alt='a&#39;b=""'>`},
		{`</b`, `</b`},
		{`<title></`, `<title></`},
		{`<svg <`, `<svg <`},
		{`<svg "`, `<svg "`},
		{`<svg></`, `<svg></`},
		{`<script><!--<`, `<script><!--<`},

		// bugs
		{`<amp-analytics type=adobeanalytics_nativeConfig>`, `<amp-analytics type=adobeanalytics_nativeConfig>`}, // #270
		{`<p>text</p><br>text`, `<p>text</p><br>text`},                                                           // #122
		{`text <img> text`, `text <img> text`},                                                                   // #89
		{`text <progress></progress> text`, `text <progress></progress> text`},                                   // #89
		{`<pre> <x> a  b </x> </pre>`, `<pre> <x> a  b </x> </pre>`},                                             // #82
		{`<svg id="1"></svg>`, `<svg id="1"></svg>`},                                                             // #67
	}

	m := minify.New()
	m.AddFunc("text/html", Minify)
	m.AddFunc("text/css", func(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
		_, err := io.Copy(w, r)
		return err
	})
	m.AddFunc("application/javascript", func(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
		_, err := io.Copy(w, r)
		return err
	})
	for _, tt := range htmlTests {
		t.Run(tt.html, func(t *testing.T) {
			r := bytes.NewBufferString(tt.html)
			w := &bytes.Buffer{}
			err := Minify(m, w, r, nil)
			test.Minify(t, tt.html, err, w.String(), tt.expected)
		})
	}
}

func TestHTMLCSSJS(t *testing.T) {
	htmlTests := []struct {
		html     string
		expected string
	}{
		// bugs
		{`<div style="font-family: Arial, &#39;sans-serif&#39;; font-size: 22px;">`, `<div style=font-family:Arial,sans-serif;font-size:22px>`}, // #272
	}

	m := minify.New()
	m.AddFunc("text/html", Minify)
	m.AddFunc("text/css", css.Minify)
	m.AddFunc("application/javascript", js.Minify)
	for _, tt := range htmlTests {
		t.Run(tt.html, func(t *testing.T) {
			r := bytes.NewBufferString(tt.html)
			w := &bytes.Buffer{}
			err := Minify(m, w, r, nil)
			test.Minify(t, tt.html, err, w.String(), tt.expected)
		})
	}
}

func TestHTMLKeepEndTags(t *testing.T) {
	htmlTests := []struct {
		html     string
		expected string
	}{
		{`<p></p><p></p>`, `<p></p><p></p>`},
		{`<ul><li></li><li></li></ul>`, `<ul><li></li><li></li></ul>`},
	}

	m := minify.New()
	htmlMinifier := &Minifier{KeepEndTags: true}
	for _, tt := range htmlTests {
		t.Run(tt.html, func(t *testing.T) {
			r := bytes.NewBufferString(tt.html)
			w := &bytes.Buffer{}
			err := htmlMinifier.Minify(m, w, r, nil)
			test.Minify(t, tt.html, err, w.String(), tt.expected)
		})
	}
}

func TestHTMLKeepConditionalComments(t *testing.T) {
	htmlTests := []struct {
		html     string
		expected string
	}{
		{`<!--[if IE 6]> <b> </b> <![endif]-->`, `<!--[if IE 6]><b></b><![endif]-->`},
		{`<![if IE 6]> <b> </b> <![endif]>`, `<![if IE 6]><b></b><![endif]>`},
		{`<!--[if IE 6]--> <b> </b> <!--[endif]-->`, `<!--[if IE 6]--><b></b><!--[endif]-->`},
		{`<!--[if !mso]><!--> <b> </b> <!--<![endif]-->`, `<!--[if !mso]><!--><b></b><!--<![endif]-->`},
		{`<!--[if gt IE 6]><!--> <b> </b> <![endif]-->`, `<!--[if gt IE 6]><!--><b></b><![endif]-->`},
	}

	m := minify.New()
	htmlMinifier := &Minifier{KeepConditionalComments: true}
	for _, tt := range htmlTests {
		t.Run(tt.html, func(t *testing.T) {
			r := bytes.NewBufferString(tt.html)
			w := &bytes.Buffer{}
			err := htmlMinifier.Minify(m, w, r, nil)
			test.Minify(t, tt.html, err, w.String(), tt.expected)
		})
	}
}

func TestHTMLKeepWhitespace(t *testing.T) {
	htmlTests := []struct {
		html     string
		expected string
	}{
		{`cats  and 	dogs `, `cats and dogs`},
		{` <div> <i> test </i> <b> test </b> </div> `, `<div> <i> test </i> <b> test </b> </div>`},
		{`<strong>x </strong>y`, `<strong>x </strong>y`},
		{`<strong>x </strong> y`, `<strong>x </strong> y`},
		{"<strong>x </strong>\ny", "<strong>x </strong>\ny"},
		{`<p>x </p>y`, `<p>x </p>y`},
		{`x <p>y</p>`, `x <p>y`},
		{` <!doctype html> <!--comment--> <html> <body><p></p></body></html> `, `<!doctype html><p>`}, // spaces before html and at the start of html are dropped
		{`<p>x<br> y`, `<p>x<br> y`},
		{`<p>x </b> <b> y`, `<p>x </b> <b> y`},
		{`a <code>code</code> b`, `a <code>code</code> b`},
		{`a <code></code> b`, `a <code></code> b`},
		{`a <script>script</script> b`, `a <script>script</script> b`},
		{"text\n<!--comment-->\ntext", "text\ntext"},
		{"text\n<!--comment-->text<!--comment--> text", "text\ntext text"},
		{"abc\n</body>\ndef", "abc\ndef"},
		{"<x>\n<!--y-->\n</x>", "<x>\n</x>"},
		{"<style>lala{color:red}</style>", "<style>lala{color:red}</style>"},
	}

	m := minify.New()
	htmlMinifier := &Minifier{KeepWhitespace: true}
	for _, tt := range htmlTests {
		t.Run(tt.html, func(t *testing.T) {
			r := bytes.NewBufferString(tt.html)
			w := &bytes.Buffer{}
			err := htmlMinifier.Minify(m, w, r, nil)
			test.Minify(t, tt.html, err, w.String(), tt.expected)
		})
	}
}

func TestHTMLURL(t *testing.T) {
	htmlTests := []struct {
		url      string
		html     string
		expected string
	}{
		{`http://example.com/`, `<a href=http://example.com/>link</a>`, `<a href=//example.com/>link</a>`},
		{`https://example.com/`, `<a href=http://example.com/>link</a>`, `<a href=http://example.com/>link</a>`},
		{`http://example.com/`, `<a href=https://example.com/>link</a>`, `<a href=https://example.com/>link</a>`},
		{`https://example.com/`, `<a href=https://example.com/>link</a>`, `<a href=//example.com/>link</a>`},
		{`http://example.com/`, `<a href="   http://example.com  ">x</a>`, `<a href=//example.com>x</a>`},
		{`http://example.com/`, `<link rel="stylesheet" type="text/css" href="http://example.com">`, `<link rel=stylesheet href=//example.com>`},
		{`http://example.com/`, `<!doctype html> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head profile="http://dublincore.org/documents/dcq-html/"> <!-- Barlesque 2.75.0 --> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />`,
			`<!doctype html><html xmlns=//www.w3.org/1999/xhtml xml:lang=en><head profile=//dublincore.org/documents/dcq-html/><meta charset=utf-8>`},
		{`http://example.com/`, `<html xmlns="http://www.w3.org/1999/xhtml"></html>`, `<html xmlns=//www.w3.org/1999/xhtml>`},
		{`https://example.com/`, `<html xmlns="http://www.w3.org/1999/xhtml"></html>`, `<html xmlns=http://www.w3.org/1999/xhtml>`},
		{`http://example.com/`, `<html xmlns="https://www.w3.org/1999/xhtml"></html>`, `<html xmlns=https://www.w3.org/1999/xhtml>`},
		{`https://example.com/`, `<html xmlns="https://www.w3.org/1999/xhtml"></html>`, `<html xmlns=//www.w3.org/1999/xhtml>`},
	}

	m := minify.New()
	m.AddFunc("text/html", Minify)
	for _, tt := range htmlTests {
		t.Run(tt.url, func(t *testing.T) {
			r := bytes.NewBufferString(tt.html)
			w := &bytes.Buffer{}
			m.URL, _ = url.Parse(tt.url)
			err := Minify(m, w, r, nil)
			test.Minify(t, tt.html, err, w.String(), tt.expected)
		})
	}
}

func TestSpecialTagClosing(t *testing.T) {
	m := minify.New()
	m.AddFunc("text/html", Minify)
	m.AddFunc("text/css", func(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
		b, err := ioutil.ReadAll(r)
		test.Error(t, err)
		test.String(t, string(b), "</script>")
		_, err = w.Write(b)
		return err
	})

	html := `<style></script></style>`
	r := bytes.NewBufferString(html)
	w := &bytes.Buffer{}
	err := Minify(m, w, r, nil)
	test.Minify(t, html, err, w.String(), html)
}

func TestReaderErrors(t *testing.T) {
	r := test.NewErrorReader(0)
	w := &bytes.Buffer{}
	m := minify.New()
	err := Minify(m, w, r, nil)
	test.T(t, err, test.ErrPlain, "return error at first read")
}

func TestWriterErrors(t *testing.T) {
	errorTests := []struct {
		html string
		n    []int
	}{
		{`<!doctype>`, []int{0}},
		{`text`, []int{0}},
		{`<foo attr=val>`, []int{0, 1, 2, 3, 4, 5}},
		{`</foo>`, []int{0}},
		{`<style>x</style>`, []int{2}},
		{`<textarea>x</textarea>`, []int{2}},
		{`<code>x</code>`, []int{2}},
		{`<pre>x</pre>`, []int{2}},
		{`<svg>x</svg>`, []int{0}},
		{`<math>x</math>`, []int{0}},
		{`<!--[if IE 6]> text <![endif]-->`, []int{0, 1, 2}},
		{`<![if IE 6]> text <![endif]>`, []int{0}},
	}

	m := minify.New()
	m.Add("text/html", &Minifier{
		KeepConditionalComments: true,
	})

	for _, tt := range errorTests {
		for _, n := range tt.n {
			t.Run(fmt.Sprint(tt.html, " ", tt.n), func(t *testing.T) {
				r := bytes.NewBufferString(tt.html)
				w := test.NewErrorWriter(n)
				err := m.Minify("text/html", w, r)
				test.T(t, err, test.ErrPlain)
			})
		}
	}
}

func TestMinifyErrors(t *testing.T) {
	errorTests := []struct {
		html string
		err  error
	}{
		{`<style>abc</style>`, test.ErrPlain},
		{`<p style="abc"/>`, test.ErrPlain},
		{`<p onclick="abc"/>`, test.ErrPlain},
		{`<svg></svg>`, test.ErrPlain},
		{`<math></math>`, test.ErrPlain},
	}

	m := minify.New()
	m.AddFunc("text/css", func(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
		return test.ErrPlain
	})
	m.AddFunc("application/javascript", func(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
		return test.ErrPlain
	})
	m.AddFunc("image/svg+xml", func(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
		return test.ErrPlain
	})
	m.AddFunc("application/mathml+xml", func(_ *minify.M, w io.Writer, r io.Reader, _ map[string]string) error {
		return test.ErrPlain
	})
	for _, tt := range errorTests {
		t.Run(tt.html, func(t *testing.T) {
			r := bytes.NewBufferString(tt.html)
			w := &bytes.Buffer{}
			err := Minify(m, w, r, nil)
			test.T(t, err, tt.err)
		})
	}
}

////////////////////////////////////////////////////////////////

func ExampleMinify() {
	m := minify.New()
	m.AddFunc("text/html", Minify)
	m.AddFunc("text/css", css.Minify)
	m.AddFunc("image/svg+xml", svg.Minify)
	m.AddFuncRegexp(regexp.MustCompile("^(application|text)/(x-)?(java|ecma)script$"), js.Minify)
	m.AddFuncRegexp(regexp.MustCompile("[/+]json$"), json.Minify)
	m.AddFuncRegexp(regexp.MustCompile("[/+]xml$"), xml.Minify)

	// set URL to minify link locations too
	m.URL, _ = url.Parse("https://www.example.com/")
	if err := m.Minify("text/html", os.Stdout, os.Stdin); err != nil {
		panic(err)
	}
}

func ExampleMinify_options() {
	m := minify.New()
	m.Add("text/html", &Minifier{
		KeepDefaultAttrVals: true,
		KeepWhitespace:      true,
	})

	if err := m.Minify("text/html", os.Stdout, os.Stdin); err != nil {
		panic(err)
	}
}

func ExampleMinify_reader() {
	b := bytes.NewReader([]byte("<html><body><h1>Example</h1></body></html>"))

	m := minify.New()
	m.Add("text/html", &Minifier{})

	r := m.Reader("text/html", b)
	if _, err := io.Copy(os.Stdout, r); err != nil {
		panic(err)
	}
	// Output: <h1>Example</h1>
}

func ExampleMinify_writer() {
	m := minify.New()
	m.Add("text/html", &Minifier{})

	w := m.Writer("text/html", os.Stdout)
	w.Write([]byte("<html><body><h1>Example</h1></body></html>"))
	w.Close()
	// Output: <h1>Example</h1>
}
