package weblive

import (
	"encoding/json"
	"os"
	"strings"

	"github.com/pion/webrtc/v3"
)

// MediaEngine 与 API 构建（全局复用，避免重复注册编解码器）
func buildAPI() (*webrtc.API, error) {
	m := &webrtc.MediaEngine{}
	if err := m.RegisterDefaultCodecs(); err != nil {
		return nil, err
	}
	api := webrtc.NewAPI(webrtc.WithMediaEngine(m))
	return api, nil
}

func iceServersFromEnv() []webrtc.ICEServer {
	raw := strings.TrimSpace(os.Getenv("LIVE_ICE_SERVERS"))
	if raw == "" {
		return []webrtc.ICEServer{
			{URLs: []string{"stun:stun.l.google.com:19302"}},
		}
	}
	var servers []webrtc.ICEServer
	if err := json.Unmarshal([]byte(raw), &servers); err != nil {
		return []webrtc.ICEServer{{URLs: []string{"stun:stun.l.google.com:19302"}}}
	}
	return servers
}