package controller

import (
	"context"
	"fmt"
	"strconv"

	"github.com/gravitl/netmaker/functions"
	nodepb "github.com/gravitl/netmaker/grpc"
	"github.com/gravitl/netmaker/models"
	"go.mongodb.org/mongo-driver/mongo"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

type NodeServiceServer struct {
	NodeDB *mongo.Collection
	nodepb.UnimplementedNodeServiceServer
}

func (s *NodeServiceServer) ReadNode(ctx context.Context, req *nodepb.ReadNodeReq) (*nodepb.ReadNodeRes, error) {
	// convert string id (from proto) to mongoDB ObjectId
	macaddress := req.GetMacaddress()
	networkName := req.GetNetwork()
	network, _ := functions.GetParentNetwork(networkName)

	node, err := GetNode(macaddress, networkName)

	if err != nil {
		return nil, status.Errorf(codes.InvalidArgument, fmt.Sprintf("Something went wrong: %v", err))
	}

	/*
		if node == nil {
			return nil, status.Errorf(codes.NotFound, fmt.Sprintf("Could not find node with Mac Address %s: %v", req.GetMacaddress(), err))
		}
	*/
	// Cast to ReadNodeRes type
	response := &nodepb.ReadNodeRes{
		Node: &nodepb.Node{
			Macaddress:      node.MacAddress,
			Name:            node.Name,
			Address:         node.Address,
			Endpoint:        node.Endpoint,
			Password:        node.Password,
			Nodenetwork:     node.Network,
			Interface:       node.Interface,
			Localaddress:    node.LocalAddress,
			Postdown:        node.PostDown,
			Postup:          node.PostUp,
			Checkininterval: node.CheckInInterval,
			Ispending:       node.IsPending,
			Publickey:       node.PublicKey,
			Listenport:      node.ListenPort,
			Keepalive:       node.PersistentKeepalive,
			Islocal:         *network.IsLocal,
			Localrange:      network.LocalRange,
		},
	}
	return response, nil
}

func (s *NodeServiceServer) CreateNode(ctx context.Context, req *nodepb.CreateNodeReq) (*nodepb.CreateNodeRes, error) {
	// Get the protobuf node type from the protobuf request type
	// Essentially doing req.Node to access the struct with a nil check
	data := req.GetNode()
	// Now we have to convert this into a NodeItem type to convert into BSON
	node := models.Node{
		// ID:       primitive.NilObjectID,
		MacAddress:          data.GetMacaddress(),
		LocalAddress:        data.GetLocaladdress(),
		Name:                data.GetName(),
		Address:             data.GetAddress(),
		AccessKey:           data.GetAccesskey(),
		Endpoint:            data.GetEndpoint(),
		PersistentKeepalive: data.GetKeepalive(),
		Password:            data.GetPassword(),
		Interface:           data.GetInterface(),
		Network:             data.GetNodenetwork(),
		IsPending:           data.GetIspending(),
		PublicKey:           data.GetPublickey(),
		ListenPort:          data.GetListenport(),
	}

	err := ValidateNodeCreate(node.Network, node)

	if err != nil {
		// return internal gRPC error to be handled later
		return nil, err
	}

	//Check to see if key is valid
	//TODO: Triple inefficient!!! This is the third call to the DB we make for networks
	validKey := functions.IsKeyValid(node.Network, node.AccessKey)
	network, err := functions.GetParentNetwork(node.Network)
	if err != nil {
		return nil, status.Errorf(codes.NotFound, fmt.Sprintf("Could not find network: %v", err))
	} else {
		fmt.Println("Creating node in network " + network.NetID)
		fmt.Println("Network is local? " + strconv.FormatBool(*network.IsLocal))
		fmt.Println("Range if local: " + network.LocalRange)
	}

	if !validKey {
		//Check to see if network will allow manual sign up
		//may want to switch this up with the valid key check and avoid a DB call that way.
		if *network.AllowManualSignUp {
			node.IsPending = true
		} else {
			return nil, status.Errorf(
				codes.Internal,
				fmt.Sprintf("Invalid key, and network does not allow no-key signups"),
			)
		}
	}

	node, err = CreateNode(node, node.Network)

	if err != nil {
		// return internal gRPC error to be handled later
		return nil, status.Errorf(
			codes.Internal,
			fmt.Sprintf("Internal error: %v", err),
		)
	}
	// return the node in a CreateNodeRes type
	response := &nodepb.CreateNodeRes{
		Node: &nodepb.Node{
			Macaddress:   node.MacAddress,
			Localaddress: node.LocalAddress,
			Name:         node.Name,
			Address:      node.Address,
			Endpoint:     node.Endpoint,
			Password:     node.Password,
			Interface:    node.Interface,
			Nodenetwork:  node.Network,
			Ispending:    node.IsPending,
			Publickey:    node.PublicKey,
			Listenport:   node.ListenPort,
			Keepalive:    node.PersistentKeepalive,
			Islocal:      *network.IsLocal,
			Localrange:   network.LocalRange,
		},
	}
	err = SetNetworkNodesLastModified(node.Network)
	if err != nil {
		return nil, status.Errorf(codes.NotFound, fmt.Sprintf("Could not update network last modified date: %v", err))
	}

	return response, nil
}

func (s *NodeServiceServer) CheckIn(ctx context.Context, req *nodepb.CheckInReq) (*nodepb.CheckInRes, error) {
	// Get the protobuf node type from the protobuf request type
	// Essentially doing req.Node to access the struct with a nil check
	data := req.GetNode()
	//postchanges := req.GetPostchanges()
	// Now we have to convert this into a NodeItem type to convert into BSON
	node := models.Node{
		// ID:       primitive.NilObjectID,
		MacAddress:          data.GetMacaddress(),
		Address:             data.GetAddress(),
		Endpoint:            data.GetEndpoint(),
		Network:             data.GetNodenetwork(),
		Password:            data.GetPassword(),
		LocalAddress:        data.GetLocaladdress(),
		ListenPort:          data.GetListenport(),
		PersistentKeepalive: data.GetKeepalive(),
		PublicKey:           data.GetPublickey(),
	}

	checkinresponse, err := NodeCheckIn(node, node.Network)

	if err != nil {
		// return internal gRPC error to be handled later
		if checkinresponse == (models.CheckInResponse{}) || !checkinresponse.IsPending {
			return nil, status.Errorf(
				codes.Internal,
				fmt.Sprintf("Internal error: %v", err),
			)
		}
	}
	// return the node in a CreateNodeRes type
	response := &nodepb.CheckInRes{
		Checkinresponse: &nodepb.CheckInResponse{
			Success:          checkinresponse.Success,
			Needpeerupdate:   checkinresponse.NeedPeerUpdate,
			Needdelete:       checkinresponse.NeedDelete,
			Needconfigupdate: checkinresponse.NeedConfigUpdate,
			Needkeyupdate:    checkinresponse.NeedKeyUpdate,
			Nodemessage:      checkinresponse.NodeMessage,
			Ispending:        checkinresponse.IsPending,
		},
	}
	return response, nil
}

func (s *NodeServiceServer) UpdateNode(ctx context.Context, req *nodepb.UpdateNodeReq) (*nodepb.UpdateNodeRes, error) {
	// Get the node data from the request
	data := req.GetNode()
	// Now we have to convert this into a NodeItem type to convert into BSON
	nodechange := models.NodeUpdate{
		// ID:       primitive.NilObjectID,
		MacAddress:          data.GetMacaddress(),
		Name:                data.GetName(),
		Address:             data.GetAddress(),
		LocalAddress:        data.GetLocaladdress(),
		Endpoint:            data.GetEndpoint(),
		Password:            data.GetPassword(),
		PersistentKeepalive: data.GetKeepalive(),
		Network:             data.GetNodenetwork(),
		Interface:           data.GetInterface(),
		PostDown:            data.GetPostdown(),
		PostUp:              data.GetPostup(),
		IsPending:           data.GetIspending(),
		PublicKey:           data.GetPublickey(),
		ListenPort:          data.GetListenport(),
	}

	// Convert the Id string to a MongoDB ObjectId
	macaddress := nodechange.MacAddress
	networkName := nodechange.Network
	network, _ := functions.GetParentNetwork(networkName)

	err := ValidateNodeUpdate(networkName, nodechange)
	if err != nil {
		return nil, err
	}

	node, err := functions.GetNodeByMacAddress(networkName, macaddress)
	if err != nil {
		return nil, status.Errorf(
			codes.NotFound,
			fmt.Sprintf("Could not find node with supplied Mac Address: %v", err),
		)
	}

	newnode, err := UpdateNode(nodechange, node)

	if err != nil {
		return nil, status.Errorf(
			codes.NotFound,
			fmt.Sprintf("Could not find node with supplied Mac Address: %v", err),
		)
	}
	return &nodepb.UpdateNodeRes{
		Node: &nodepb.Node{
			Macaddress:   newnode.MacAddress,
			Localaddress: newnode.LocalAddress,
			Name:         newnode.Name,
			Address:      newnode.Address,
			Endpoint:     newnode.Endpoint,
			Password:     newnode.Password,
			Interface:    newnode.Interface,
			Postdown:     newnode.PostDown,
			Postup:       newnode.PostUp,
			Nodenetwork:  newnode.Network,
			Ispending:    newnode.IsPending,
			Publickey:    newnode.PublicKey,
			Listenport:   newnode.ListenPort,
			Keepalive:    newnode.PersistentKeepalive,
			Islocal:      *network.IsLocal,
			Localrange:   network.LocalRange,
		},
	}, nil
}

func (s *NodeServiceServer) DeleteNode(ctx context.Context, req *nodepb.DeleteNodeReq) (*nodepb.DeleteNodeRes, error) {
	fmt.Println("beginning node delete")
	macaddress := req.GetMacaddress()
	network := req.GetNetworkName()

	success, err := DeleteNode(macaddress, network)

	if err != nil || !success {
		fmt.Println("Error deleting node.")
		fmt.Println(err)
		return nil, status.Errorf(codes.NotFound, fmt.Sprintf("Could not find/delete node with mac address %s", macaddress))
	}

	fmt.Println("updating network last modified of " + req.GetNetworkName())
	err = SetNetworkNodesLastModified(req.GetNetworkName())
	if err != nil {
		fmt.Println("Error updating Network")
		fmt.Println(err)
		return nil, status.Errorf(codes.NotFound, fmt.Sprintf("Could not update network last modified date: %v", err))
	}

	return &nodepb.DeleteNodeRes{
		Success: true,
	}, nil
}

func (s *NodeServiceServer) GetPeers(req *nodepb.GetPeersReq, stream nodepb.NodeService_GetPeersServer) error {
	// Initiate a NodeItem type to write decoded data to
	//data := &models.PeersResponse{}
	// collection.Find returns a cursor for our (empty) query
	//cursor, err := s.NodeDB.Find(context.Background(), bson.M{})
	peers, err := GetPeersList(req.GetNetwork())

	if err != nil {
		return status.Errorf(codes.Internal, fmt.Sprintf("Unknown internal error: %v", err))
	}
	// cursor.Next() returns a boolean, if false there are no more items and loop will break
	for i := 0; i < len(peers); i++ {

		// If no error is found send node over stream
		stream.Send(&nodepb.GetPeersRes{
			Peers: &nodepb.PeersResponse{
				Address:      peers[i].Address,
				Endpoint:     peers[i].Endpoint,
				Gatewayrange: peers[i].GatewayRange,
				Isgateway:    peers[i].IsGateway,
				Publickey:    peers[i].PublicKey,
				Keepalive:    peers[i].KeepAlive,
				Listenport:   peers[i].ListenPort,
				Localaddress: peers[i].LocalAddress,
			},
		})
	}

	node, err := functions.GetNodeByMacAddress(req.GetNetwork(), req.GetMacaddress())
	if err != nil {
		return status.Errorf(codes.Internal, fmt.Sprintf("Could not get node: %v", err))
	}

	err = TimestampNode(node, false, true, false)
	if err != nil {
		return status.Errorf(codes.Internal, fmt.Sprintf("Internal error occurred: %v", err))
	}

	return nil
}