package classes_test

import (
	"testing"

	"git.golem15.com/golem15/sm-sitemap-plugin/classes"
)

// TestRewrite pins the PHP routes.php frontend_url rewrite: the backend URL
// is replaced inside loc, inside xhtml:link href and in the exact stylesheet
// href, nowhere else; slashes are trimmed on both; an empty or "0" frontend
// URL and equal URLs leave the document unchanged.
func TestRewrite(t *testing.T) {
	const backend = "https://api.ex.pl"
	doc := "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
		`<?xml-stylesheet type="text/xsl" href="https://api.ex.pl/sitemap.xsl"?>` + "\n" +
		`<urlset><url><loc>https://api.ex.pl/a</loc><lastmod>2026</lastmod><changefreq>https://api.ex.pl</changefreq><priority>1</priority>` +
		`<xhtml:link rel="alternate" hreflang="pl" href="https://api.ex.pl/a"/><xhtml:link rel="alternate" hreflang="en" href="https://api.ex.pl/en/a"/>` +
		`<extra>https://api.ex.pl/x</extra></url><url><loc>https://other.pl/https://api.ex.pl</loc><changefreq>c</changefreq><priority>p</priority></url></urlset>` + "\n"
	want := "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
		`<?xml-stylesheet type="text/xsl" href="https://www.ex.pl/sitemap.xsl"?>` + "\n" +
		`<urlset><url><loc>https://www.ex.pl/a</loc><lastmod>2026</lastmod><changefreq>https://api.ex.pl</changefreq><priority>1</priority>` +
		`<xhtml:link rel="alternate" hreflang="pl" href="https://www.ex.pl/a"/><xhtml:link rel="alternate" hreflang="en" href="https://www.ex.pl/en/a"/>` +
		`<extra>https://api.ex.pl/x</extra></url><url><loc>https://other.pl/https://www.ex.pl</loc><changefreq>c</changefreq><priority>p</priority></url></urlset>` + "\n"
	for _, frontend := range []string{"https://www.ex.pl", "https://www.ex.pl/", "https://www.ex.pl///"} {
		for _, back := range []string{backend, backend + "/"} {
			if got := classes.Rewrite(doc, back, frontend); got != want {
				t.Fatalf("Rewrite(%q, %q):\n%s\nwant:\n%s", back, frontend, got, want)
			}
		}
	}
	for _, frontend := range []string{"", "0"} {
		if got := classes.Rewrite(doc, backend, frontend); got != doc {
			t.Fatalf("frontend %q changed the document", frontend)
		}
	}
	if got := classes.Rewrite(doc, backend, backend); got != doc {
		t.Fatal("equal URLs changed the document")
	}
	if got := classes.Rewrite(doc, backend+"/", backend); got != doc {
		t.Fatal("equal URLs up to a slash changed the document")
	}
	// An empty backend URL replaces nothing.
	if got := classes.Rewrite(doc, "", "https://www.ex.pl"); got != doc {
		t.Fatal("an empty backend URL changed the document")
	}
	// A stylesheet on another path is not the PHP pattern.
	other := `<?xml-stylesheet type="text/xsl" href="https://api.ex.pl/other.xsl"?>`
	if got := classes.Rewrite(other, backend, "https://www.ex.pl"); got != other {
		t.Fatalf("other stylesheet = %q", got)
	}
}