package static

import (
	"embed"
	"io"
	"io/fs"
	"log"
	"net/http"
	"strings"
)

//go:embed app/dist
var appFS embed.FS

var Handler = func() http.HandlerFunc {
	distFS, err := fs.Sub(appFS, "app/dist")
	if err != nil {
		log.Fatalln(err)
	}
	fileServer := http.FileServer(http.FS(distFS))
	return func(w http.ResponseWriter, r *http.Request) {
		path := strings.TrimPrefix(r.URL.Path, "/")
		_, err := distFS.Open(path)
		if err == nil || path == "" {
			fileServer.ServeHTTP(w, r)
			return
		}
		indexFile, err := distFS.Open("index.html")
		if err != nil {
			http.Error(w, "frontend build not found", http.StatusInternalServerError)
			return
		}
		defer func() { _ = indexFile.Close() }()
		stat, _ := indexFile.Stat()
		http.ServeContent(w, r, "index.html", stat.ModTime(), indexFile.(io.ReadSeeker))
	}
}()