// Copyright The Monogon Project Authors.
// SPDX-License-Identifier: Apache-2.0

package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"os/signal"

	"github.com/spf13/cobra"

	"source.monogon.dev/metropolis/cli/metroctl/core"
	"source.monogon.dev/metropolis/proto/api"
)

var approveCmd = &cobra.Command{
	Short: "Approves a candidate node, if specified; lists nodes pending approval otherwise.",
	Use:   "approve [node-id]",
	Args:  PrintUsageOnWrongArgs(cobra.MaximumNArgs(1)), // One positional argument: node ID
	RunE: func(cmd *cobra.Command, args []string) error {
		ctx, _ := signal.NotifyContext(context.Background(), os.Interrupt)
		cc, err := newAuthenticatedClient(ctx)
		if err != nil {
			return fmt.Errorf("while creating client: %w", err)
		}
		mgmt := api.NewManagementClient(cc)

		// Get a list of all nodes pending approval by calling Management.GetNodes.
		// We need this list regardless of whether we're actually approving nodes, or
		// just listing them.
		nodes, err := core.GetNodes(ctx, mgmt, "node.state == NODE_STATE_NEW")
		if err != nil {
			log.Fatalf("While fetching a list of nodes pending approval: %v", err)
		}

		if len(args) == 0 {
			// If no id was given, just list the nodes pending approval.
			if len(nodes) != 0 {
				for _, n := range nodes {
					fmt.Println(n.Id)
				}
			} else {
				log.Print("There are no nodes pending approval at this time.")
			}
		} else {
			// Otherwise, try to approve the nodes matching the supplied ids.
			for _, tgtNodeId := range args {
				n := nodeById(nodes, tgtNodeId)
				if n == nil {
					return fmt.Errorf("couldn't find a new node matching id %s", tgtNodeId)
				}
				// nolint:SA5011
				_, err := mgmt.ApproveNode(ctx, &api.ApproveNodeRequest{
					Pubkey: n.Pubkey,
				})
				if err != nil {
					return fmt.Errorf("while approving node %s: %w", tgtNodeId, err)
				}
				log.Printf("Approved node %s.", tgtNodeId)
			}
		}
		return nil
	},
}

func init() {
	rootCmd.AddCommand(approveCmd)
}

// nodeById returns the node matching id, if it exists within nodes.
func nodeById(nodes []*api.Node, id string) *api.Node {
	for _, n := range nodes {
		if n.Id == id {
			return n
		}
	}
	return nil
}