package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"isle/daemon/network"
	"os"
)

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 (
			hostName hostNameFlag
			ip       ipFlag
		)

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

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

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

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

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

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

		currBoostrap, err := ctx.daemonRPC.GetBootstrap(ctx)
		if err != nil {
			return nil, fmt.Errorf("calling GetBootstrap: %w", err)
		}

		hosts := currBoostrap.HostsOrdered()

		type storageAllocationView struct {
			ID        string `yaml:"id"`
			RPCPort   int    `yaml:"rpc_port"`
			S3APIPort int    `yaml:"s3_api_port"`
		}

		type hostView struct {
			Name string `yaml:"name"`
			VPN  struct {
				IP         string `yaml:"ip"`
				PublicAddr string `yaml:"public_addr,omitempty"`
			}
			Storage struct {
				Allocations []storageAllocationView `yaml:"allocations"`
			} `yaml:",omitempty"`
		}

		hostViews := make([]hostView, len(hosts))
		for i, host := range hosts {
			storageAllocViews := make([]storageAllocationView, len(host.Garage.Instances))
			for i := range host.Garage.Instances {
				storageAllocViews[i] = storageAllocationView(host.Garage.Instances[i])
			}

			hostView := hostView{
				Name: string(host.Name),
			}

			hostView.VPN.IP = host.IP().String()
			hostView.VPN.PublicAddr = host.Nebula.PublicAddr
			hostView.Storage.Allocations = storageAllocViews
			hostViews[i] = hostView
		}

		return hostViews, nil
	}),
}

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

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

		ctx, err := ctx.withParsedFlags()
		if 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,
		)
	},
}