// Package webui embeds the built web application into the binary so the tool
// ships as a single file with no runtime assets to install.
package webui

import (
	"embed"
	"io/fs"
)

//go:embed all:dist
var dist embed.FS

// FS returns the built web app rooted at its index.html, or nil when the
// frontend has not been built into this binary.
func FS() fs.FS {
	sub, err := fs.Sub(dist, "dist")
	if err != nil {
		return nil
	}
	if _, err := fs.Stat(sub, "index.html"); err != nil {
		return nil
	}
	return sub
}

// Built reports whether a real UI is embedded, as opposed to the placeholder
// that keeps the package compiling before the frontend is built.
func Built() bool {
	sub := FS()
	if sub == nil {
		return false
	}
	_, err := fs.Stat(sub, "assets")
	return err == nil
}