package docsite

import "testing"

// root is the real corpus, relative to this package. Every gate below
// runs against it.
const root = "../../docs/site"

// TestNavAndFilesAgreeBothWays keeps the table of contents honest in
// both directions. A page nav.json names must exist — Load fails on
// that one — and a page on disk that no nav entry reaches must not. An
// unreachable page is the worse failure: it looks written, and nobody
// ever reads it.
func TestNavAndFilesAgreeBothWays(t *testing.T) {
	site, err := Load(root)
	if err != nil {
		t.Fatalf("load: %v", err)
	}

	seen := map[string]bool{}
	for _, p := range site.Pages() {
		if seen[p.Slug] {
			t.Errorf("%s: appears in nav.json more than once", p.Slug)
		}
		seen[p.Slug] = true

		if p.Title == "" {
			t.Errorf("%s: no `# ` title", p.Slug)
		}
		if p != site.Index && p.Blurb == "" {
			t.Errorf("%s: no blurb in nav.json (it renders on the /docs index)", p.Slug)
		}
		if p != site.Index && p.Label == "" {
			t.Errorf("%s: no label in nav.json", p.Slug)
		}
	}

	files, err := MarkdownFiles(root)
	if err != nil {
		t.Fatalf("walk %s: %v", root, err)
	}
	for _, slug := range files {
		if !seen[slug] {
			t.Errorf("docs/site/%s.md exists but no nav.json entry reaches it", slug)
		}
	}
}

// TestOrphanPagesAreCaught proves the gate above can actually fail. The
// check that never fires is the check nobody notices is broken.
func TestOrphanPagesAreCaught(t *testing.T) {
	site, err := Load("testdata/orphan")
	if err != nil {
		t.Fatalf("load: %v", err)
	}
	seen := map[string]bool{}
	for _, p := range site.Pages() {
		seen[p.Slug] = true
	}
	files, err := MarkdownFiles("testdata/orphan")
	if err != nil {
		t.Fatalf("walk: %v", err)
	}
	var orphans []string
	for _, slug := range files {
		if !seen[slug] {
			orphans = append(orphans, slug)
		}
	}
	if len(orphans) != 1 || orphans[0] != "stranded" {
		t.Errorf("orphans = %v, want [stranded]", orphans)
	}
}

// TestNavNamingAMissingPageFails is the other direction.
func TestNavNamingAMissingPageFails(t *testing.T) {
	if _, err := Load("testdata/missing"); err == nil {
		t.Fatal("Load succeeded on a nav.json naming a page that does not exist")
	}
}