// Package webui embeds the HTML templates and static assets.
//
// It lives at the repository root next to the files it embeds, because Go's
// embed directive cannot reach outside its own directory. The HTTP handlers
// that consume these assets live in internal/web.
//
// Everything the browser needs — Bootstrap, Bootstrap Icons and their web
// font, and Chart.js — is vendored here rather than loaded from a CDN, so the
// management interface works on a network with no Internet access. That is not
// a hypothetical: a DNS server whose own UI needs working DNS to render is
// unusable in exactly the situation an administrator most needs it.
package webui

import (
	"embed"
	"io/fs"
)

//go:embed templates
var templatesFS embed.FS

//go:embed static
var staticFS embed.FS

// Templates returns the template tree rooted at the templates directory.
func Templates() fs.FS {
	sub, err := fs.Sub(templatesFS, "templates")
	if err != nil {
		// Unreachable: the directory is embedded at build time.
		panic("webui: templates directory is missing from the binary: " + err.Error())
	}
	return sub
}

// Static returns the static asset tree rooted at the static directory.
func Static() fs.FS {
	sub, err := fs.Sub(staticFS, "static")
	if err != nil {
		panic("webui: static directory is missing from the binary: " + err.Error())
	}
	return sub
}