package server

import (
	"net/http"
	"strings"

	"glchat/internal/httpx"
)

// reservedPrefixes are handled by the API, the gateway or the file CDN; an
// unknown path under them is a real 404 and must not receive the SPA shell.
// `/updates/` — статика автообновления: обёртка ждёт JSON или 404, а не HTML.
var reservedPrefixes = []string{"/api/", "/gateway", "/files/", "/rtc", "/updates/"}

func isReservedPath(path string) bool {
	for _, prefix := range reservedPrefixes {
		if path == strings.TrimSuffix(prefix, "/") || strings.HasPrefix(path, prefix) {
			return true
		}
	}
	return false
}

func (s *Server) handleFallback(w http.ResponseWriter, r *http.Request) {
	if isReservedPath(r.URL.Path) {
		httpx.WriteError(w, httpx.NewError(httpx.CodeNotFound, "resource not found"))
		return
	}
	if r.Method == http.MethodGet || r.Method == http.MethodHead {
		s.static.serve(w, r)
		return
	}
	httpx.WriteError(w, httpx.NewError(httpx.CodeNotFound, "resource not found"))
}