package cmd

import (
	"fmt"

	"github.com/spf13/cobra"
	"github.com/david/knox/internal/db"
	"github.com/david/knox/internal/watch"
)

// NewGossipCmd exposes peer status/diff for the gossip protocol.
func NewGossipCmd(kdb *db.KnoxDB) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "gossip",
		Short: "Inspect peer-to-peer observation sync",
	}
	cmd.AddCommand(
		&cobra.Command{
			Use:   "status",
			Short: "Show known peers and knowledge vectors",
			RunE: func(c *cobra.Command, args []string) error {
				peers, err := kdb.ListPeers()
				if err != nil {
					return err
				}
				vector, err := kdb.KnowledgeVector()
				if err != nil {
					return err
				}
				fmt.Printf("node_id: %s\n", kdb.NodeID())
				fmt.Printf("peers (static: %d configured):\n", len(watch.PeerAddrs()))
				for _, p := range peers {
					fmt.Printf("  %-24s %-28s last=%s  vector=%d\n", p.PeerID, p.Addr, p.LastHandshake, p.Cursor)
				}
				if len(peers) == 0 {
					fmt.Println("  (none — set KNOX_PEERS to sync with other nodes)")
				}
				fmt.Println("knowledge vector (node_id -> max hcl):")
				for nid, hcl := range vector {
					if nid == kdb.NodeID() {
						continue
					}
					fmt.Printf("  %-24s -> %d\n", nid, hcl)
				}
				return nil
			},
		},
	)
	return cmd
}