package cni

import (
	"encoding/json"

	"github.com/containernetworking/cni/pkg/types"
)

// NetConf is the CNI network configuration parsed from the NetworkAttachmentDefinition.
type NetConf struct {
	types.NetConf

	// MeshConfig is the path to the mesh topology file (e.g., /etc/kedge/mesh.json).
	MeshConfig string `json:"meshConfig"`

	// UnderlayRoutes are subnets reachable via VLAN bridge interfaces (underlay mode).
	UnderlayRoutes []SubnetRoute `json:"underlayRoutes,omitempty"`

	// OverlayRoutes are subnets reachable via WireGuard/VXLAN tunnels (overlay mode).
	OverlayRoutes []SubnetRoute `json:"overlayRoutes,omitempty"`
}

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

// ParseNetConf parses the CNI network configuration from raw bytes.
func ParseNetConf(data []byte) (*NetConf, error) {
	conf := &NetConf{}
	if err := json.Unmarshal(data, conf); err != nil {
		return nil, err
	}
	return conf, nil
}