//nolint
package headscale

import (
	"context"
	"encoding/json"
	"time"

	"github.com/juanfont/headscale/gen/go/headscale/v1"
	"github.com/rs/zerolog/log"
	"gorm.io/datatypes"
	"tailscale.com/tailcfg"
)

type headscaleV1APIServer struct { // v1.HeadscaleServiceServer
	v1.UnimplementedHeadscaleServiceServer
	h *Headscale
}

func newHeadscaleV1APIServer(h *Headscale) v1.HeadscaleServiceServer {
	return headscaleV1APIServer{
		h: h,
	}
}

func (api headscaleV1APIServer) GetNamespace(
	ctx context.Context,
	request *v1.GetNamespaceRequest,
) (*v1.GetNamespaceResponse, error) {
	namespace, err := api.h.GetNamespace(request.GetName())
	if err != nil {
		return nil, err
	}

	return &v1.GetNamespaceResponse{Namespace: namespace.toProto()}, nil
}

func (api headscaleV1APIServer) CreateNamespace(
	ctx context.Context,
	request *v1.CreateNamespaceRequest,
) (*v1.CreateNamespaceResponse, error) {
	namespace, err := api.h.CreateNamespace(request.GetName())
	if err != nil {
		return nil, err
	}

	return &v1.CreateNamespaceResponse{Namespace: namespace.toProto()}, nil
}

func (api headscaleV1APIServer) RenameNamespace(
	ctx context.Context,
	request *v1.RenameNamespaceRequest,
) (*v1.RenameNamespaceResponse, error) {
	err := api.h.RenameNamespace(request.GetOldName(), request.GetNewName())
	if err != nil {
		return nil, err
	}

	namespace, err := api.h.GetNamespace(request.GetNewName())
	if err != nil {
		return nil, err
	}

	return &v1.RenameNamespaceResponse{Namespace: namespace.toProto()}, nil
}

func (api headscaleV1APIServer) DeleteNamespace(
	ctx context.Context,
	request *v1.DeleteNamespaceRequest,
) (*v1.DeleteNamespaceResponse, error) {
	err := api.h.DestroyNamespace(request.GetName())
	if err != nil {
		return nil, err
	}

	return &v1.DeleteNamespaceResponse{}, nil
}

func (api headscaleV1APIServer) ListNamespaces(
	ctx context.Context,
	request *v1.ListNamespacesRequest,
) (*v1.ListNamespacesResponse, error) {
	namespaces, err := api.h.ListNamespaces()
	if err != nil {
		return nil, err
	}

	response := make([]*v1.Namespace, len(namespaces))
	for index, namespace := range namespaces {
		response[index] = namespace.toProto()
	}

	log.Trace().Caller().Interface("namespaces", response).Msg("")

	return &v1.ListNamespacesResponse{Namespaces: response}, nil
}

func (api headscaleV1APIServer) CreatePreAuthKey(
	ctx context.Context,
	request *v1.CreatePreAuthKeyRequest,
) (*v1.CreatePreAuthKeyResponse, error) {
	var expiration time.Time
	if request.GetExpiration() != nil {
		expiration = request.GetExpiration().AsTime()
	}

	preAuthKey, err := api.h.CreatePreAuthKey(
		request.GetNamespace(),
		request.GetReusable(),
		request.GetEphemeral(),
		&expiration,
	)
	if err != nil {
		return nil, err
	}

	return &v1.CreatePreAuthKeyResponse{PreAuthKey: preAuthKey.toProto()}, nil
}

func (api headscaleV1APIServer) ExpirePreAuthKey(
	ctx context.Context,
	request *v1.ExpirePreAuthKeyRequest,
) (*v1.ExpirePreAuthKeyResponse, error) {
	preAuthKey, err := api.h.GetPreAuthKey(request.GetNamespace(), request.Key)
	if err != nil {
		return nil, err
	}

	err = api.h.ExpirePreAuthKey(preAuthKey)
	if err != nil {
		return nil, err
	}

	return &v1.ExpirePreAuthKeyResponse{}, nil
}

func (api headscaleV1APIServer) ListPreAuthKeys(
	ctx context.Context,
	request *v1.ListPreAuthKeysRequest,
) (*v1.ListPreAuthKeysResponse, error) {
	preAuthKeys, err := api.h.ListPreAuthKeys(request.GetNamespace())
	if err != nil {
		return nil, err
	}

	response := make([]*v1.PreAuthKey, len(preAuthKeys))
	for index, key := range preAuthKeys {
		response[index] = key.toProto()
	}

	return &v1.ListPreAuthKeysResponse{PreAuthKeys: response}, nil
}

func (api headscaleV1APIServer) RegisterMachine(
	ctx context.Context,
	request *v1.RegisterMachineRequest,
) (*v1.RegisterMachineResponse, error) {
	log.Trace().
		Str("namespace", request.GetNamespace()).
		Str("machine_key", request.GetKey()).
		Msg("Registering machine")

	// TODO(kradalby): Currently, if it fails to find a requested expiry, non will be set
	// This means that if a user is to slow with register a machine, it will possibly not
	// have the correct expiry.
	requestedTime := time.Time{}
	if requestedTimeIf, found := api.h.requestedExpiryCache.Get(request.GetKey()); found {
		log.Trace().
			Caller().
			Str("machine", request.Key).
			Msg("Expiry time found in cache, assigning to node")
		if reqTime, ok := requestedTimeIf.(time.Time); ok {
			requestedTime = reqTime
		}
	}

	machine, err := api.h.RegisterMachineFromAuthCallback(
		request.GetKey(),
		request.GetNamespace(),
		RegisterMethodCLI,
		&requestedTime,
	)
	if err != nil {
		return nil, err
	}

	return &v1.RegisterMachineResponse{Machine: machine.toProto()}, nil
}

func (api headscaleV1APIServer) GetMachine(
	ctx context.Context,
	request *v1.GetMachineRequest,
) (*v1.GetMachineResponse, error) {
	machine, err := api.h.GetMachineByID(request.GetMachineId())
	if err != nil {
		return nil, err
	}

	return &v1.GetMachineResponse{Machine: machine.toProto()}, nil
}

func (api headscaleV1APIServer) DeleteMachine(
	ctx context.Context,
	request *v1.DeleteMachineRequest,
) (*v1.DeleteMachineResponse, error) {
	machine, err := api.h.GetMachineByID(request.GetMachineId())
	if err != nil {
		return nil, err
	}

	err = api.h.DeleteMachine(
		machine,
	)
	if err != nil {
		return nil, err
	}

	return &v1.DeleteMachineResponse{}, nil
}

func (api headscaleV1APIServer) ExpireMachine(
	ctx context.Context,
	request *v1.ExpireMachineRequest,
) (*v1.ExpireMachineResponse, error) {
	machine, err := api.h.GetMachineByID(request.GetMachineId())
	if err != nil {
		return nil, err
	}

	api.h.ExpireMachine(
		machine,
	)

	log.Trace().
		Str("machine", machine.Name).
		Time("expiry", *machine.Expiry).
		Msg("machine expired")

	return &v1.ExpireMachineResponse{Machine: machine.toProto()}, nil
}

func (api headscaleV1APIServer) ListMachines(
	ctx context.Context,
	request *v1.ListMachinesRequest,
) (*v1.ListMachinesResponse, error) {
	if request.GetNamespace() != "" {
		machines, err := api.h.ListMachinesInNamespace(request.GetNamespace())
		if err != nil {
			return nil, err
		}

		response := make([]*v1.Machine, len(machines))
		for index, machine := range machines {
			response[index] = machine.toProto()
		}

		return &v1.ListMachinesResponse{Machines: response}, nil
	}

	machines, err := api.h.ListMachines()
	if err != nil {
		return nil, err
	}

	response := make([]*v1.Machine, len(machines))
	for index, machine := range machines {
		response[index] = machine.toProto()
	}

	return &v1.ListMachinesResponse{Machines: response}, nil
}

func (api headscaleV1APIServer) GetMachineRoute(
	ctx context.Context,
	request *v1.GetMachineRouteRequest,
) (*v1.GetMachineRouteResponse, error) {
	machine, err := api.h.GetMachineByID(request.GetMachineId())
	if err != nil {
		return nil, err
	}

	routes, err := machine.RoutesToProto()
	if err != nil {
		return nil, err
	}

	return &v1.GetMachineRouteResponse{
		Routes: routes,
	}, nil
}

func (api headscaleV1APIServer) EnableMachineRoutes(
	ctx context.Context,
	request *v1.EnableMachineRoutesRequest,
) (*v1.EnableMachineRoutesResponse, error) {
	machine, err := api.h.GetMachineByID(request.GetMachineId())
	if err != nil {
		return nil, err
	}

	err = api.h.EnableRoutes(machine, request.GetRoutes()...)
	if err != nil {
		return nil, err
	}

	routes, err := machine.RoutesToProto()
	if err != nil {
		return nil, err
	}

	return &v1.EnableMachineRoutesResponse{
		Routes: routes,
	}, nil
}

func (api headscaleV1APIServer) CreateApiKey(
	ctx context.Context,
	request *v1.CreateApiKeyRequest,
) (*v1.CreateApiKeyResponse, error) {
	var expiration time.Time
	if request.GetExpiration() != nil {
		expiration = request.GetExpiration().AsTime()
	}

	apiKey, _, err := api.h.CreateAPIKey(
		&expiration,
	)
	if err != nil {
		return nil, err
	}

	return &v1.CreateApiKeyResponse{ApiKey: apiKey}, nil
}

func (api headscaleV1APIServer) ExpireApiKey(
	ctx context.Context,
	request *v1.ExpireApiKeyRequest,
) (*v1.ExpireApiKeyResponse, error) {
	var apiKey *APIKey
	var err error

	apiKey, err = api.h.GetAPIKey(request.Prefix)
	if err != nil {
		return nil, err
	}

	err = api.h.ExpireAPIKey(apiKey)
	if err != nil {
		return nil, err
	}

	return &v1.ExpireApiKeyResponse{}, nil
}

func (api headscaleV1APIServer) ListApiKeys(
	ctx context.Context,
	request *v1.ListApiKeysRequest,
) (*v1.ListApiKeysResponse, error) {
	apiKeys, err := api.h.ListAPIKeys()
	if err != nil {
		return nil, err
	}

	response := make([]*v1.ApiKey, len(apiKeys))
	for index, key := range apiKeys {
		response[index] = key.toProto()
	}

	return &v1.ListApiKeysResponse{ApiKeys: response}, nil
}

// The following service calls are for testing and debugging
func (api headscaleV1APIServer) DebugCreateMachine(
	ctx context.Context,
	request *v1.DebugCreateMachineRequest,
) (*v1.DebugCreateMachineResponse, error) {
	namespace, err := api.h.GetNamespace(request.GetNamespace())
	if err != nil {
		return nil, err
	}

	routes, err := stringToIPPrefix(request.GetRoutes())
	if err != nil {
		return nil, err
	}

	log.Trace().
		Caller().
		Interface("route-prefix", routes).
		Interface("route-str", request.GetRoutes()).
		Msg("")

	hostinfo := tailcfg.Hostinfo{
		RoutableIPs: routes,
		OS:          "TestOS",
		Hostname:    "DebugTestMachine",
	}

	log.Trace().Caller().Interface("hostinfo", hostinfo).Msg("")

	hostinfoJson, err := json.Marshal(hostinfo)
	if err != nil {
		return nil, err
	}

	newMachine := Machine{
		MachineKey: request.GetKey(),
		Name:       request.GetName(),
		Namespace:  *namespace,

		Expiry:               &time.Time{},
		LastSeen:             &time.Time{},
		LastSuccessfulUpdate: &time.Time{},

		HostInfo: datatypes.JSON(hostinfoJson),
	}

	api.h.registrationCache.Set(
		request.GetKey(),
		newMachine,
		requestedExpiryCacheExpiration,
	)

	return &v1.DebugCreateMachineResponse{Machine: newMachine.toProto()}, nil
}

func (api headscaleV1APIServer) mustEmbedUnimplementedHeadscaleServiceServer() {}