package config

import "strings"

// DetectProtocol infers protocol from a share/proxy URI or config body.
func DetectProtocol(raw string) Protocol {
	lower := strings.ToLower(strings.TrimSpace(raw))
	switch {
	case strings.HasPrefix(lower, "hysteria2://"), strings.HasPrefix(lower, "hy2://"):
		return ProtocolHysteria2
	case strings.HasPrefix(lower, "vless://"):
		return ProtocolVLESS
	case strings.HasPrefix(lower, "vmess://"):
		return ProtocolVMess
	case strings.HasPrefix(lower, "trojan://"):
		return ProtocolTrojan
	case strings.HasPrefix(lower, "awg://"), strings.HasPrefix(lower, "amneziawg://"),
		strings.HasPrefix(lower, "wireguard://"), strings.HasPrefix(lower, "vpn://"):
		return ProtocolAWG
	case strings.Contains(lower, "[interface]") && (strings.Contains(lower, "privatekey") || strings.Contains(lower, "private_key") || strings.Contains(lower, "private key")):
		return ProtocolAWG
	case strings.HasPrefix(strings.TrimSpace(raw), "{") && (strings.Contains(lower, "client_priv_key") || strings.Contains(lower, "server_pub_key")):
		return ProtocolAWG
	case strings.HasPrefix(lower, "naive+"), strings.HasPrefix(lower, "naive://"),
		strings.HasPrefix(lower, "https://"), strings.HasPrefix(lower, "quic://"),
		strings.HasPrefix(lower, "http://"):
		return ProtocolNaive
	default:
		return ""
	}
}