package main

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

var subCmdHostsCreate = subCmd{
	name:  "create",
	descr: "Creates a new host in the network, writing its new bootstrap.json to stdout",
	do: func(subCmdCtx subCmdCtx) error {
		var (
			flags    = subCmdCtx.flagSet(false)
			hostName nebula.HostName
			ip       netip.Addr
		)

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

		ipF := flags.VarPF(
			textUnmarshalerFlag{&ip}, "ip", "i", "IP of the new host",
		)

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

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

		if !hostNameF.Changed || !ipF.Changed {
			return errors.New("--hostname and --ip are required")
		}

		var res daemon.CreateHostResult
		err := subCmdCtx.daemonRCPClient.Call(
			subCmdCtx.ctx,
			&res,
			"CreateHost",
			daemon.CreateHostRequest{
				HostName: hostName,
				IP:       ip,
				Opts: daemon.CreateHostOpts{
					CanCreateHosts: *canCreateHosts,
				},
			},
		)
		if err != nil {
			return fmt.Errorf("calling CreateHost: %w", err)
		}

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

var subCmdHostsList = subCmd{
	name:  "list",
	descr: "Lists all hosts in the network, and their IPs",
	do: func(subCmdCtx subCmdCtx) error {
		hostsRes, err := subCmdCtx.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 subCmdHostsRemove = subCmd{
	name:  "remove",
	descr: "Removes a host from the network",
	do: func(subCmdCtx subCmdCtx) error {
		var (
			flags    = subCmdCtx.flagSet(false)
			hostName nebula.HostName
		)

		hostNameF := flags.VarPF(
			textUnmarshalerFlag{&hostName},
			"hostname", "h",
			"Name of the host to remove",
		)

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

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

		err := subCmdCtx.daemonRCPClient.Call(
			subCmdCtx.ctx, nil, "RemoveHost", daemon.RemoveHostRequest{
				HostName: hostName,
			},
		)
		if err != nil {
			return fmt.Errorf("calling RemoveHost: %w", err)
		}

		return nil
	},
}

var subCmdHosts = subCmd{
	name:  "hosts",
	descr: "Sub-commands having to do with configuration of hosts in the network",
	do: func(subCmdCtx subCmdCtx) error {
		return subCmdCtx.doSubCmd(
			subCmdHostsCreate,
			subCmdHostsRemove,
			subCmdHostsList,
		)
	},
}