package chrome

import (
	"embed"
	"html/template"
)

//go:embed templates/chrome.tmpl
var templateFS embed.FS

// Attach parses the shared chrome partials ("srht-nav", "srht-env-banner",
// "srht-head-links", "srht-repo-list", "srht-repo-table") into t, so a service
// layout can invoke them. Call it once per template set, before the layout
// that references the partials is executed.
//
// It installs Funcs first, because the partials call them: an unknown function
// is a parse error, so a caller who had not merged Funcs would get a startup
// panic naming a template it never wrote. Installing them here also means the
// partials keep working when a service overrides a helper afterwards — its own
// Funcs call wins for its own templates.
func Attach(t *template.Template) (*template.Template, error) {
	return t.Funcs(Funcs()).ParseFS(templateFS, "templates/chrome.tmpl")
}

// MustAttach is Attach for the common wire-up-at-startup path, where a parse
// failure is a programmer error.
func MustAttach(t *template.Template) *template.Template {
	t, err := Attach(t)
	if err != nil {
		panic(err)
	}
	return t
}