package htmlformat

import (
	"strings"
	"testing"

	"github.com/google/go-cmp/cmp"
)

func TestFormat(t *testing.T) {
	tests := []struct {
		name     string
		input    string
		expected string
	}{
		{
			name:  "missing closing tags are inserted",
			input: `<li>`,
			expected: `<li>
</li>
`,
		},
		{
			name:  "html attribute escaping is normalized",
			input: `<ol> <li style="&amp;&#38;"> A </li> <li> B </li> </ol> `,
			expected: `<ol>
 <li style="&amp;&amp;">A</li>
 <li>B</li>
</ol>
`,
		},
		{
			name:  "bare ampersands are escaped",
			input: `<ol> <li style="&"> A </li> <li> B </li> </ol> `,
			expected: `<ol>
 <li style="&amp;">A</li>
 <li>B</li>
</ol>
`,
		},
		{
			name:  "html elements are indented",
			input: `<ol> <li class="name"> A </li> <li> B </li> </ol> `,
			expected: `<ol>
 <li class="name">A</li>
 <li>B</li>
</ol>
`,
		},
		{
			name:     "text fragments are supported",
			input:    `test 123`,
			expected: `test 123` + "\n",
		},
		{
			name: "script tags are only indented",
			input: `<script>
	var x = 1;
</script>`,
			expected: `<script>
  var x = 1;
</script>` + "\n",
		},
		{
			name:  "phrasing content element children are kept on the same line, including punctuation",
			input: `<ul><li><a href="http://example.com">Test</a>.</li></ul>`,
			expected: `<ul>
 <li>
  <a href="http://example.com">Test</a>.
 </li>
</ul>
`,
		},
		{
			name: "style content is indented consistently",
			input: `<style>
body {
  text-color: red;
}
</style>`,
			expected: `<style>
  body {
    text-color: red;
  }
</style>
`,
		},
		{
			name:  "space after text node with punctuation is preserved",
			input: `<p><a href="https://example.com">Link</a>. <a href="https://example.org">Another</a></p>`,
			expected: `<p>
 <a href="https://example.com">Link</a>.
 <a href="https://example.org">Another</a>
</p>
`,
		},
		{
			name:  "spaces are not added around elements ending with punctuation",
			input: "<div><time>19:00</time>–<time>20:00</time></div>",
			expected: `<div>
 <time>19:00</time>–<time>20:00</time>
</div>
`,
		},
	}

	for _, test := range tests {
		test := test
		t.Run(test.name, func(t *testing.T) {
			t.Parallel()

			r := strings.NewReader(test.input)
			w := new(strings.Builder)
			if err := Fragment(w, r); err != nil {
				t.Fatalf("failed to format: %v", err)
			}
			if diff := cmp.Diff(test.expected, w.String()); diff != "" {
				t.Error(diff)
			}
		})
	}
}