package aerotun

import "time"

const (
	ProtocolName      = "AeroTUN"
	ProtocolVersion   = 1
	DefaultMTU        = 1420
	DefaultPort       = 51830
	MagicHeader       = 0xAE70 // "AE"
	FlagCompressedLZ4 = 0x01
	FlagKeepalive     = 0x02
	StoragePath       = "/etc/proxmox-router/vpn/aerotun_instances.json"
)

// TunnelInstance represents a configured AeroTUN interface and its live status
type TunnelInstance struct {
	ID             string    `json:"id"`
	Name           string    `json:"name"`            // e.g. "aerotun0"
	Mode           string    `json:"mode"`            // "server" (listen) or "client" (dial)
	ListenPort     int       `json:"listen_port"`     // UDP port to bind
	RemoteEndpoint string    `json:"remote_endpoint"` // "host:port" (used if client or static peer)
	LocalAddress   string    `json:"local_address"`   // CIDR e.g. "10.99.0.1/24"
	PeerAddress    string    `json:"peer_address"`    // Peer CIDR e.g. "10.99.0.2/24"
	PSK            string    `json:"psk"`             // 32-byte hex/base64 pre-shared key
	Compression    bool      `json:"compression"`     // Enable adaptive LZ4
	MTU            int       `json:"mtu"`             // e.g. 1420
	DefaultRoute   bool      `json:"default_route"`   // Route 0.0.0.0/0 via this tunnel
	Disabled       bool      `json:"disabled"`        // MikroTik 'X' flag
	Comment        string    `json:"comment,omitempty"`
	CreatedAt      time.Time `json:"created_at"`

	// Runtime state & telemetry
	Running            bool    `json:"running"`
	ActivePeerEndpoint string  `json:"active_peer_endpoint,omitempty"`
	LastHandshake      string  `json:"last_handshake,omitempty"`
	RxBytes            uint64  `json:"rx_bytes"`
	TxBytes            uint64  `json:"tx_bytes"`
	RawBytesIn         uint64  `json:"raw_bytes_in"`  // uncompressed RX payload
	RawBytesOut        uint64  `json:"raw_bytes_out"` // uncompressed TX payload
	WireBytesIn        uint64  `json:"wire_bytes_in"` // actual wire RX
	WireBytesOut       uint64  `json:"wire_bytes_out"`// actual wire TX
	SavedBytes         uint64  `json:"saved_bytes"`   // Bandwidth saved through compression
	CompressionRatio   string  `json:"compression_ratio,omitempty"`
	PacketsRx          uint64  `json:"packets_rx"`
	PacketsTx          uint64  `json:"packets_tx"`
	CompressedPackets  uint64  `json:"compressed_packets"`
	RawPackets         uint64  `json:"raw_packets"`
}

// SummaryStats aggregates performance across all AeroTUN tunnels
type SummaryStats struct {
	TotalTunnels     int    `json:"total_tunnels"`
	ActiveTunnels    int    `json:"active_tunnels"`
	TotalRxBytes     uint64 `json:"total_rx_bytes"`
	TotalTxBytes     uint64 `json:"total_tx_bytes"`
	TotalSavedBytes  uint64 `json:"total_saved_bytes"`
	AverageRatio     string `json:"average_ratio"`
	AlgorithmCrypto  string `json:"algorithm_crypto"`
	AlgorithmCompress string `json:"algorithm_compress"`
}