package static

import (
	"embed"
	"io/fs"
	"log"
	"os"
	"path/filepath"
)

//go:embed build
var embeddedBuild embed.FS

func BuildFS() fs.FS {
	sub, err := fs.Sub(embeddedBuild, "build")
	if err != nil {
		log.Printf("[static] embed nao disponivel, tentando filesystem: %v", err)
		// Fallback: look for build directory relative to the backend binary
		dir := os.Getenv("YAUM_STATIC_DIR")
		if dir == "" {
			// Try common locations
			candidates := []string{
				"../frontend/build",
				"frontend/build",
				"./build",
			}
			for _, c := range candidates {
				if info, e := os.Stat(c); e == nil && info.IsDir() {
					dir = c
					break
				}
			}
		}
		if dir != "" {
			abs, _ := filepath.Abs(dir)
			log.Printf("[static] servindo de %s", abs)
			return os.DirFS(dir)
		}
		return nil
	}
	log.Println("[static] servindo de embed")
	return sub
}