package webapp

import (
	"embed"
	"io/fs"
	"net/http"
	"os"
)

//go:embed dist
var embeddedWebappFS embed.FS

// GetFilesystem returns a HTTP filesystem with the embedded webapp files
func GetFilesystem() (http.FileSystem, error) {
	// Try embedded filesystem first (production mode)
	if embeddedFS, err := fs.Sub(embeddedWebappFS, "dist"); err == nil {
		// Check if embedded filesystem has content by trying to open index.html
		if _, err := embeddedFS.Open("index.html"); err == nil {
			return http.FS(embeddedFS), nil
		}
	}

	// Fallback to filesystem for development (when dist exists locally)
	if _, err := os.Stat("dist"); err == nil {
		return http.Dir("dist"), nil
	}

	// Fall back to an empty filesystem if files don't exist
	return http.Dir("."), nil
}