package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"isle/bootstrap"
	"isle/daemon"
	"isle/jsonutil"
	"os"
	"sort"
)

var subCmdHostCreate = subCmd{
	name:  "create",
	descr: "Creates a new host in the network, writing its new bootstrap.json to stdout",
	do: func(ctx subCmdCtx) error {
		var (
			flags    = ctx.flagSet(false)
			hostName hostNameFlag
			ip       ipFlag
		)

		hostNameF := flags.VarPF(
			&hostName,
			"hostname", "n",
			"Name of the host to generate bootstrap.json for",
		)

		flags.VarP(&ip, "ip", "i", "IP of the new host. An available IP will be chosen if none is given.")

		canCreateHosts := flags.Bool(
			"can-create-hosts",
			false,
			"The new host should have the ability to create hosts too",
		)

		if err := flags.Parse(ctx.args); err != nil {
			return fmt.Errorf("parsing flags: %w", err)
		}

		if !hostNameF.Changed {
			return errors.New("--hostname is required")
		}

		res, err := ctx.daemonRPC.CreateHost(
			ctx, hostName.V, daemon.CreateHostOpts{
				IP:             ip.V,
				CanCreateHosts: *canCreateHosts,
			},
		)
		if err != nil {
			return fmt.Errorf("calling CreateHost: %w", err)
		}

		return json.NewEncoder(os.Stdout).Encode(res.JoiningBootstrap)
	},
}

var subCmdHostList = subCmd{
	name:  "list",
	descr: "Lists all hosts in the network, and their IPs",
	do: func(ctx subCmdCtx) error {
		hostsRes, err := ctx.getHosts()
		if err != nil {
			return fmt.Errorf("calling GetHosts: %w", err)
		}

		type host struct {
			Name string
			VPN  struct {
				IP string
			}
			Storage bootstrap.GarageHost `json:",omitempty"`
		}

		hosts := make([]host, 0, len(hostsRes.Hosts))
		for _, h := range hostsRes.Hosts {

			host := host{
				Name:    string(h.Name),
				Storage: h.Garage,
			}

			host.VPN.IP = h.IP().String()

			hosts = append(hosts, host)
		}

		sort.Slice(hosts, func(i, j int) bool { return hosts[i].Name < hosts[j].Name })

		return jsonutil.WriteIndented(os.Stdout, hosts)
	},
}

var subCmdHostRemove = subCmd{
	name:  "remove",
	descr: "Removes a host from the network",
	do: func(ctx subCmdCtx) error {
		var (
			flags    = ctx.flagSet(false)
			hostName hostNameFlag
		)

		hostNameF := flags.VarPF(
			&hostName,
			"hostname", "n",
			"Name of the host to remove",
		)

		if err := flags.Parse(ctx.args); err != nil {
			return fmt.Errorf("parsing flags: %w", err)
		}

		if !hostNameF.Changed {
			return errors.New("--hostname is required")
		}

		if err := ctx.daemonRPC.RemoveHost(ctx, hostName.V); err != nil {
			return fmt.Errorf("calling RemoveHost: %w", err)
		}

		return nil
	},
}

var subCmdHost = subCmd{
	name:   "host",
	plural: "s",
	descr:  "Sub-commands having to do with configuration of hosts in the network",
	do: func(ctx subCmdCtx) error {
		return ctx.doSubCmd(
			subCmdHostCreate,
			subCmdHostRemove,
			subCmdHostList,
		)
	},
}