package ocpp

import (
	"context"
	"encoding/base64"
	"net/http"
)

// Proxy mode reuses the Session read loops (session.go) to pump frames between
// the charger and Anker's cloud while tapping status and injecting our own
// control calls. This file only provides the upstream dialer and auth helpers;
// the CSMS is handed the already-dialed upstream connection via Accept.

// DialUpstream opens a client OCPP 1.6J connection to an upstream CSMS (Anker's
// cloud) for proxy mode. authHeader, when non-empty, is sent as the Authorization
// request header (OCPP security profile 1 Basic auth).
func DialUpstream(ctx context.Context, url, authHeader string) (*Conn, error) {
	h := http.Header{}
	if authHeader != "" {
		h.Set("Authorization", authHeader)
	}
	return Dial(ctx, url, []string{"ocpp1.6"}, h)
}

// BasicAuthHeader builds an HTTP Basic Authorization header value.
func BasicAuthHeader(user, pass string) string {
	return "Basic " + base64.StdEncoding.EncodeToString([]byte(user+":"+pass))
}