package main

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

// The built frontend is compiled into the binary, so deployment is one file.
//
//go:embed all:web/dist
var webFS embed.FS

func webHandler() http.Handler {
	dist, err := fs.Sub(webFS, "web/dist")
	if err != nil {
		panic(err)
	}
	fileServer := http.FileServer(http.FS(dist))
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		p := strings.TrimPrefix(path.Clean(r.URL.Path), "/")
		if p != "" {
			if _, err := fs.Stat(dist, p); err != nil {
				// SPA fallback: unknown paths serve the app shell.
				r.URL.Path = "/"
			}
		}
		fileServer.ServeHTTP(w, r)
	})
}