package topology

// MeshTopology represents the current mesh state shared between
// the CNI plugin (reader) and DaemonSet (writer).
type MeshTopology struct {
	// NodeID identifies this node in the mesh.
	NodeID string `json:"node_id"`

	// ClusterID identifies the cluster this node belongs to.
	ClusterID string `json:"cluster_id"`

	// Mode indicates the active modes: "overlay", "underlay", or "both".
	Mode string `json:"mode"`

	// Peers are the WireGuard mesh peers (overlay mode).
	Peers []PeerInfo `json:"peers,omitempty"`

	// OverlaySubnets are subnets reachable via WireGuard tunnels.
	OverlaySubnets []SubnetRoute `json:"overlay_subnets,omitempty"`

	// UnderlaySubnets are subnets reachable via VLAN bridges.
	UnderlaySubnets []SubnetRoute `json:"underlay_subnets,omitempty"`

	// WireGuard interface configuration (overlay).
	WireGuard WireGuardConfig `json:"wireguard,omitempty"`
}

// PeerInfo describes a WireGuard mesh peer.
type PeerInfo struct {
	PublicKey  string   `json:"public_key"`
	Endpoint  string   `json:"endpoint"`
	AllowedIPs []string `json:"allowed_ips"`
	ClusterID string   `json:"cluster_id,omitempty"`
}

// SubnetRoute maps a destination CIDR to an interface.
type SubnetRoute struct {
	Dst       string `json:"dst"`       // e.g., "172.16.0.0/24"
	Via       string `json:"via"`       // e.g., "vlan100" or "wg0"
	Mode      string `json:"mode"`      // "overlay" or "underlay"
}

// WireGuardConfig holds the local node's WireGuard configuration.
type WireGuardConfig struct {
	InterfaceName string `json:"interface_name"` // e.g., "wg0"
	ListenPort    int    `json:"listen_port"`
	PrivateKeyPath string `json:"private_key_path"`
}