//go:build !dev

package main

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

//go:embed web/dist
var webFS embed.FS

func spaHandler() http.Handler {
	return &spa{root: "web/dist", fs: webFS}
}

type spa struct {
	root string
	fs   embed.FS
}

func (h *spa) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	path := filepath.Join(h.root, r.URL.Path)
	f, err := h.fs.Open(path)
	if err != nil {
		index, readErr := h.fs.ReadFile(filepath.Join(h.root, "index.html"))
		if readErr != nil {
			http.Error(w, "not found", 404)
			return
		}
		w.Header().Set("Content-Type", "text/html; charset=utf-8")
		w.Write(index)
		return
	}
	f.Close()

	sub, err := fs.Sub(h.fs, h.root)
	if err != nil {
		http.Error(w, "not found", 404)
		return
	}
	http.FileServer(http.FS(sub)).ServeHTTP(w, r)
}