package serverctl

import (
	"encoding/json"
	"errors"
	"io"
	"log"
	"os"
	"os/exec"
	"time"

	"github.com/gravitl/netmaker/database"
	"github.com/gravitl/netmaker/functions"
	"github.com/gravitl/netmaker/models"
	"github.com/gravitl/netmaker/servercfg"
)

func GetServerWGConf() (models.IntClient, error) {
	var server models.IntClient
	collection, err := database.FetchRecords(database.INT_CLIENTS_TABLE_NAME)
	if err != nil {
		return models.IntClient{}, errors.New("could not find comms server")
	}
	for _, value := range collection {
		json.Unmarshal([]byte(value), &server)
		if server.Network == "comms" && server.IsServer == "yes" {
			return server, nil
		}
	}
	return models.IntClient{}, errors.New("could not find comms server")
}

func CreateCommsNetwork() (bool, error) {

	iscreated := false
	exists, err := functions.NetworkExists("comms")

	if exists || err != nil {
		log.Println("comms network already exists. Skipping...")
		return true, err
	} else {
		var network models.Network

		network.NetID = "comms"
		network.IsIPv6 = "no"
		network.IsIPv4 = "yes"
		network.IsGRPCHub = "yes"
		network.AddressRange = servercfg.GetGRPCWGAddressRange()
		network.DisplayName = "comms"
		network.SetDefaults()
		network.SetNodesLastModified()
		network.SetNetworkLastModified()
		network.KeyUpdateTimeStamp = time.Now().Unix()
		network.IsLocal = "no"
		network.KeyUpdateTimeStamp = time.Now().Unix()

		log.Println("Creating comms network...")
		value, err := json.Marshal(network)
		if err != nil {
			return false, err
		}
		database.Insert(network.NetID, string(value), database.NETWORKS_TABLE_NAME)
	}
	if err == nil {
		iscreated = true
	}
	return iscreated, err
}

func InstallNetclient() error {
	if !FileExists("/etc/netclient/netclient") {
		_, err := copy("./netclient/netclient", "/etc/netclient/netclient")
		if err != nil {
			log.Println("could not create /etc/netclient")
			return err
		}
	}
	return nil
}

func FileExists(f string) bool {
	info, err := os.Stat(f)
	if os.IsNotExist(err) {
		return false
	}
	return !info.IsDir()
}

func copy(src, dst string) (int64, error) {
	sourceFileStat, err := os.Stat(src)
	if err != nil {
		return 0, err
	}

	if !sourceFileStat.Mode().IsRegular() {
		return 0, errors.New(src + " is not a regular file")
	}

	source, err := os.Open(src)
	if err != nil {
		return 0, err
	}
	defer source.Close()

	destination, err := os.Create(dst)
	if err != nil {
		return 0, err
	}
	defer destination.Close()
	nBytes, err := io.Copy(destination, source)
	err = os.Chmod(dst, 0755)
	if err != nil {
		log.Println(err)
	}
	return nBytes, err
}

func RemoveNetwork(network string) (bool, error) {
	_, err := os.Stat("/etc/netclient/netclient")
	if err != nil {
		log.Println("could not find /etc/netclient")
		return false, err
	}
	cmdoutput, err := exec.Command("/etc/netclient/netclient", "leave", "-n", network).Output()
	if err != nil {
		log.Println(string(cmdoutput))
		return false, err
	}
	log.Println("Server removed from network " + network)
	return true, err

}

func AddNetwork(network string) (bool, error) {
	pubip, err := servercfg.GetPublicIP()
	if err != nil {
		log.Println("could not get public IP.")
		return false, err
	}

	_, err = os.Stat("/etc/netclient")
	if os.IsNotExist(err) {
		os.Mkdir("/etc/netclient", 744)
	} else if err != nil {
		log.Println("could not find or create /etc/netclient")
		return false, err
	}
	token, err := functions.CreateServerToken(network)
	if err != nil {
		log.Println("could not create server token for " + network)
		return false, err
	}
	_, err = os.Stat("/etc/netclient/netclient")
	if os.IsNotExist(err) {
		err = InstallNetclient()
		if err != nil {
			return false, err
		}
	}
	err = os.Chmod("/etc/netclient/netclient", 0755)
	if err != nil {
		log.Println("could not change netclient directory permissions")
		return false, err
	}
	log.Println("executing network join: " + "/etc/netclient/netclient " + "join " + "-t " + token + " -name " + "netmaker" + " -endpoint " + pubip)

	joinCMD := exec.Command("/etc/netclient/netclient", "join", "-t", token, "-name", "netmaker", "-endpoint", pubip)
	err = joinCMD.Run()
	if err != nil {
		log.Println("Failed to add server to network " + network)
		return false, err
	}
	log.Println("Server added to network " + network)
	return true, err
}