package mail

import (
	"bytes"
	"strings"
	"testing"
)

func TestEmbeddedMarkIsPNG(t *testing.T) {
	t.Parallel()

	if !bytes.HasPrefix(markPNG, []byte("\x89PNG\r\n\x1a\n")) {
		t.Fatal("embedded mark is not PNG data")
	}
}

func TestQuestionAnsweredContent(t *testing.T) {
	t.Parallel()

	text, htmlBody := questionAnsweredContent("https://plumber.example/", QuestionAnswered{
		ToName:        `<Sam & Pat>`,
		QuestionID:    "question-123",
		QuestionTitle: `<b>Leaky sink</b>`,
		AnswerBody:    "Replace the cartridge.\nThen test the handle. <script>alert('x')</script>",
	})

	for _, want := range []string{
		"Ask a Plumber First",
		"Shop response",
		"cid:answer-notification-mark",
		"https://plumber.example/questions/question-123",
		"white-space:pre-wrap",
		"&lt;Sam &amp; Pat&gt;",
		"&lt;b&gt;Leaky sink&lt;/b&gt;",
		"&lt;script&gt;alert(&#39;x&#39;)&lt;/script&gt;",
	} {
		if !strings.Contains(htmlBody, want) {
			t.Errorf("HTML missing %q", want)
		}
	}
	for _, unsafe := range []string{
		"<Sam & Pat>",
		"<b>Leaky sink</b>",
		"<script>alert('x')</script>",
	} {
		if strings.Contains(htmlBody, unsafe) {
			t.Errorf("HTML contains unescaped content %q", unsafe)
		}
	}
	if strings.Contains(htmlBody, "{{") {
		t.Error("HTML contains an unresolved template token")
	}
	for _, want := range []string{
		`Hi <Sam & Pat>,`,
		`Your question "<b>Leaky sink</b>"`,
		"Replace the cartridge.\nThen test the handle.",
		"https://plumber.example/questions/question-123",
	} {
		if !strings.Contains(text, want) {
			t.Errorf("text missing %q", want)
		}
	}
}

func TestQuestionAnsweredContentUsesFallbackTitle(t *testing.T) {
	t.Parallel()

	text, htmlBody := questionAnsweredContent("https://plumber.example", QuestionAnswered{})
	if !strings.Contains(text, `"your question"`) {
		t.Errorf("text missing fallback title")
	}
	if !strings.Contains(htmlBody, "a plumber replied to:</p>") ||
		!strings.Contains(htmlBody, "“your question”") {
		t.Errorf("HTML missing fallback title")
	}
}