package httpd

import (
	"io/fs"
	"regexp"
	"strings"
	"testing"
)

// A reader has no copy of the book, so nothing that cites it belongs on a page they can open.
var bookTalk = regexp.MustCompile(`(?i)\b(chapter|appendix|rule) \d|BOOK\.md|BUILD\.md|SPEC-NOTES`)

func TestNoPageTalksToWhoeverWroteIt(t *testing.T) {
	names, err := fs.Glob(templateFS, "templates/*.html")
	if err != nil || len(names) == 0 {
		t.Fatalf("found no templates to read: %v", err)
	}
	for _, name := range names {
		body, err := fs.ReadFile(templateFS, name)
		if err != nil {
			t.Fatal(err)
		}
		for i, line := range strings.Split(string(body), "\n") {
			// A go comment is for whoever writes barerepo, and a template has no comments to skip.
			if found := bookTalk.FindString(line); found != "" {
				t.Errorf("%s:%d shows a reader %q, and a reader has no book", name, i+1, found)
			}
		}
	}
}