package serverctl

import (
	"errors"
	"net"
	"os"
	"strings"
	"time"

	"github.com/gravitl/netmaker/database"
	"github.com/gravitl/netmaker/logger"
	"github.com/gravitl/netmaker/logic"
	"github.com/gravitl/netmaker/logic/acls"
	"github.com/gravitl/netmaker/logic/acls/nodeacls"
	"github.com/gravitl/netmaker/models"
	"github.com/gravitl/netmaker/netclient/ncutils"
	"github.com/gravitl/netmaker/servercfg"
)

// COMMS_NETID - name of the comms network
var COMMS_NETID string

const (
	// NETMAKER_BINARY_NAME - name of netmaker binary
	NETMAKER_BINARY_NAME = "netmaker"
)

// InitializeCommsNetwork - Check if comms network exists (for MQ, DNS, SSH traffic), if not, create
func InitializeCommsNetwork() error {

	setCommsID()

	commsNetwork, err := logic.GetNetwork(COMMS_NETID)
	if err != nil {
		var network models.Network
		network.NetID = COMMS_NETID
		network.AddressRange = servercfg.GetCommsCIDR()
		network.IsPointToSite = "yes"
		network.DefaultUDPHolePunch = "yes"
		network.IsComms = "yes"
		logger.Log(1, "comms net does not exist, creating with ID,", network.NetID, "and CIDR,", network.AddressRange)
		_, err = logic.CreateNetwork(network)
		return err
	} else if commsNetwork.DefaultACL == "" {
		commsNetwork.DefaultACL = "yes"
		if err = logic.SaveNetwork(&commsNetwork); err != nil {
			logger.Log(1, "comms net default acl is set incorrectly, please manually adjust to \"yes\",", COMMS_NETID)
		}
	}
	time.Sleep(time.Second << 1)
	SyncServerNetwork(COMMS_NETID)

	return nil
}

// SetJWTSecret - sets the jwt secret on server startup
func setCommsID() {
	currentid, idErr := logic.FetchCommsNetID()
	if idErr != nil {
		commsid := logic.RandomString(8)
		if err := logic.StoreCommsNetID(commsid); err != nil {
			logger.FatalLog("something went wrong when configuring comms id")
		}
		COMMS_NETID = commsid
		servercfg.SetCommsID(COMMS_NETID)
		return
	}
	COMMS_NETID = currentid
	servercfg.SetCommsID(COMMS_NETID)
}

// InitServerNetclient - intializes the server netclient
// 1. Check if config directory exists, if not attempt to make
// 2. Check current networks and run pull to get interface up to date in case of restart
func InitServerNetclient() error {
	netclientDir := ncutils.GetNetclientPath()
	_, err := os.Stat(netclientDir + "/config")
	if os.IsNotExist(err) {
		os.MkdirAll(netclientDir+"/config", 0700)
	} else if err != nil {
		logger.Log(1, "could not find or create", netclientDir)
		return err
	}

	var networks, netsErr = logic.GetNetworks()
	if netsErr == nil || database.IsEmptyRecord(netsErr) {
		for _, network := range networks {
			var currentServerNode, nodeErr = logic.GetNetworkServerLocal(network.NetID)
			if nodeErr == nil {
				if err = logic.ServerPull(&currentServerNode, true); err != nil {
					logger.Log(1, "failed pull for network", network.NetID, ", on server node", currentServerNode.ID)
				}
			}
		}
	}

	return nil
}

// SyncServerNetwork - ensures a wg interface and node exists for server
func SyncServerNetwork(network string) error {
	serverNetworkSettings, err := logic.GetNetwork(network)
	if err != nil {
		return err
	}
	localnets, err := net.Interfaces()
	if err != nil {
		return err
	}

	ifaceExists := false
	for _, localnet := range localnets {
		if serverNetworkSettings.DefaultInterface == localnet.Name {
			ifaceExists = true
		}
	}

	serverNode, err := logic.GetNetworkServerLocal(network)
	if !ifaceExists && (err == nil && serverNode.ID != "") {
		return logic.ServerUpdate(&serverNode, true)
	} else if !ifaceExists {
		_, err := logic.ServerJoin(&serverNetworkSettings)
		if err != nil {
			if err == nil {
				err = errors.New("network add failed for " + serverNetworkSettings.NetID)
			}
			if !strings.Contains(err.Error(), "macaddress_unique") { // ignore macaddress unique error throws
				logger.Log(1, "error adding network", serverNetworkSettings.NetID, "during sync:", err.Error())
			}
		}
	}

	// remove networks locally that do not exist in database
	/*
		for _, localnet := range localnets {
			if strings.Contains(localnet.Name, "nm-") {
				var exists = ""
				if serverNetworkSettings.DefaultInterface == localnet.Name {
					exists = serverNetworkSettings.NetID
				}
				if exists == "" {
					err := logic.DeleteNodeByID(serverNode, true)
					if err != nil {
						if err == nil {
							err = errors.New("network delete failed for " + exists)
						}
						logger.Log(1, "error removing network", exists, "during sync", err.Error())
					}
				}
			}
		}
	*/
	return nil
}

// SetDefaultACLS - runs through each network to see if ACL's are set. If not, goes through each node in network and adds the default ACL
func SetDefaultACLS() error {
	// upgraded systems will not have ACL's set, which is why we need this function
	nodes, err := logic.GetAllNodes()
	if err != nil {
		return err
	}
	for i := range nodes {
		currentNodeACL, err := nodeacls.FetchNodeACL(nodeacls.NetworkID(nodes[i].Network), nodeacls.NodeID(nodes[i].ID))
		if (err != nil && (database.IsEmptyRecord(err) || strings.Contains(err.Error(), "no node ACL present"))) || currentNodeACL == nil {
			if _, err = nodeacls.CreateNodeACL(nodeacls.NetworkID(nodes[i].Network), nodeacls.NodeID(nodes[i].ID), acls.Allowed); err != nil {
				logger.Log(1, "could not create a default ACL for node", nodes[i].ID)
			}
		}
	}
	return nil
}