package xml

import (
	"bytes"
	"fmt"
	"os"
	"regexp"
	"testing"

	"github.com/tdewolff/minify/v2"
	"github.com/tdewolff/test"
)

func TestXML(t *testing.T) {
	xmlTests := []struct {
		xml      string
		expected string
	}{
		{`<!-- comment -->`, ``},
		{`<A>x</A>`, `<A>x</A>`},
		{`<a><b>x</b></a>`, `<a><b>x</b></a>`},
		{"<a><b>x\ny</b></a>", "<a><b>x\ny</b></a>"},
		{`<a> <![CDATA[ a ]]> </a>`, `<a>a</a>`},
		{`<a >a</a >`, `<a>a</a>`},
		{`<?xml  version="1.0" ?>`, `<?xml version="1.0"?>`},
		{`<x></x>`, `<x/>`},
		{`<x> </x>`, `<x/>`},
		{`<x a="b"></x>`, `<x a="b"/>`},
		{`<x a=""></x>`, `<x a=""/>`},
		{`<x a=a></x>`, `<x a=a/>`},
		{"<x a=\" a \n\r\t b \"/>", `<x a=" a     b "/>`},
		{`<x a="&apos;b&quot;"></x>`, `<x a="'b&#34;"/>`},
		{`<x a="&quot;&quot;'"></x>`, `<x a='""&#39;'/>`},
		{`<x a="&amp;&lt;&gt;"></x>`, `<x a="&amp;&lt;>"/>`},
		{`<x>&amp;&lt;&gt;</x>`, `<x>&amp;&lt;></x>`},
		{`<!DOCTYPE foo SYSTEM "Foo.dtd">`, `<!DOCTYPE foo SYSTEM "Foo.dtd">`},
		{`text <!--comment--> text`, `text text`},
		{"text\n<!--comment-->\ntext", "text\ntext"},
		{`<!doctype html>`, `<!doctype html=>`}, // bad formatted, doctype must be uppercase and html must have attribute value
		{"<x>\n<!--y-->\n</x>", `<x></x>`},
		{`<style>lala{color:red}</style>`, `<style>lala{color:red}</style>`},
		{`cats  and 	dogs `, `cats and dogs`},

		// go fuzz
		{`</0`, `</0`},
		{`<!DOCTYPE`, `<!DOCTYPE`},
		{`<![CDATA[`, ``},
	}

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

func TestXMLKeepWhitespace(t *testing.T) {
	xmlTests := []struct {
		xml      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>`},
		{"text\n<!--comment-->\ntext", "text\ntext"},
		{"text\n<!--comment-->text<!--comment--> text", "text\ntext text"},
		{"<x>\n<!--y-->\n</x>", "<x>\n</x>"},
		{`<style>lala{color:red}</style>`, `<style>lala{color:red}</style>`},
		{`<x> <?xml?> </x>`, `<x><?xml?> </x>`},
		{`<x> <![CDATA[ x ]]> </x>`, `<x> x </x>`},
		{`<x> <![CDATA[ <<<<< ]]> </x>`, `<x><![CDATA[ <<<<< ]]></x>`},
	}

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

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 {
		xml string
		n   []int
	}{
		{`<!DOCTYPE foo>`, []int{0}},
		{`<?xml?>`, []int{0, 1}},
		{`<a x=y z="val">`, []int{0, 1, 2, 3, 4, 8, 9}},
		{`<foo/>`, []int{1}},
		{`</foo>`, []int{0}},
		{`<foo></foo>`, []int{1}},
		{`<![CDATA[data<<<<<]]>`, []int{0}},
		{`text`, []int{0}},
	}

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

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

func ExampleMinify() {
	m := minify.New()
	m.AddFuncRegexp(regexp.MustCompile("[/+]xml$"), Minify)

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