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package render

import (
	"strings"
	"testing"
)

func TestMermaidBlockRendersAsDiagram(t *testing.T) {
	src := "# Title\n\n```mermaid\ngraph TD\n  A-->B\n```\n\n```go\nfmt.Println(\"hi\")\n```\n"
	out, err := New().ToHTML([]byte(src))
	if err != nil {
		t.Fatal(err)
	}
	html := string(out)

	// The mermaid block becomes a <pre class="mermaid"> carrying the source.
	if !strings.Contains(html, `<pre class="mermaid">`) {
		t.Fatalf("no mermaid container in output:\n%s", html)
	}
	if !strings.Contains(html, "graph TD") || !strings.Contains(html, "A--&gt;B") {
		t.Fatalf("mermaid source missing/not escaped:\n%s", html)
	}
	// The mermaid source must NOT have been syntax-highlighted (no chroma spans
	// wrapping it).
	if strings.Contains(html, `class="mermaid"`) && strings.Contains(html, "graph TD</span>") {
		t.Fatalf("mermaid block was highlighted:\n%s", html)
	}
	// A normal code block is still highlighted (chroma emits classed markup).
	if !strings.Contains(html, "chroma") {
		t.Errorf("expected the go code block to be highlighted:\n%s", html)
	}
}

func TestMermaidEscapesHTML(t *testing.T) {
	// A diagram label containing markup must be escaped, never emitted raw.
	src := "```mermaid\ngraph TD\n  A[\"<img src=x onerror=alert(1)>\"]\n```\n"
	out, err := New().ToHTML([]byte(src))
	if err != nil {
		t.Fatal(err)
	}
	html := string(out)
	if strings.Contains(html, "<img src=x") {
		t.Fatalf("raw HTML leaked from mermaid source:\n%s", html)
	}
	if !strings.Contains(html, "&lt;img") {
		t.Fatalf("expected escaped markup:\n%s", html)
	}
}