package grpcapi

import (
	context "context"
	"fmt"
	"log"
	"net"

	"git.coopgo.io/coopgo-platform/groups-management/handlers"
	"github.com/spf13/viper"
	"google.golang.org/grpc"
	codes "google.golang.org/grpc/codes"
	"google.golang.org/grpc/reflection"
	status "google.golang.org/grpc/status"
)

type GroupsManagementServerImpl struct {
	handler handlers.GroupsManagementHandler
}

func NewGroupsManagementServer(h handlers.GroupsManagementHandler) *GroupsManagementServerImpl {
	return &GroupsManagementServerImpl{
		handler: h,
	}
}

func (s GroupsManagementServerImpl) AddGroup(ctx context.Context, req *AddGroupRequest) (*AddGroupResponse, error) {

	g := req.Group.ToStorageType()
	group, err := s.handler.AddGroup(g)
	if err != nil {
		fmt.Println(err)
		return nil, status.Errorf(codes.AlreadyExists, "group creation failed : %v", err)
	}
	response, err := GroupFromStorageType(group)
	if err != nil {
		fmt.Println(err)
		return nil, status.Errorf(codes.Internal, "issue while retrieving group : %v", err)
	}
	return &AddGroupResponse{Group: response}, nil
}
func (s GroupsManagementServerImpl) GetGroup(ctx context.Context, req *GetGroupRequest) (*GetGroupResponse, error) {
	group, err := s.handler.GetGroup(req.Id)
	if err != nil {
		fmt.Println(err)
		return nil, status.Errorf(codes.AlreadyExists, "issue while retrieving group : %v", err)
	}
	response, err := GroupFromStorageType(group)
	if err != nil {
		fmt.Println(err)
		return nil, status.Errorf(codes.Internal, "issue while retrieving group : %v", err)
	}
	return &GetGroupResponse{Group: response}, nil
}
func (s GroupsManagementServerImpl) GetGroups(ctx context.Context, req *GetGroupsRequest) (*GetGroupsResponse, error) {
	responses, err := s.handler.GetGroups(req.Namespaces)
	if err != nil {
		return nil, status.Errorf(codes.NotFound, "could not get groups : %v", err)
	}
	var groups []*Group

	for _, g := range responses {
		group, err := GroupFromStorageType(&g)
		if err != nil {
			return nil, status.Errorf(codes.Internal, "could not get groups : %v", err)
		}
		groups = append(groups, group)
	}
	return &GetGroupsResponse{Groups: groups}, nil
}
func (s GroupsManagementServerImpl) GetGroupsBatch(ctx context.Context, req *GetGroupsBatchRequest) (*GetGroupsBatchResponse, error) {
	responses, err := s.handler.GetGroupsBatch(req.Groupids)
	if err != nil {
		return nil, status.Errorf(codes.NotFound, "could not get groups : %v", err)
	}
	var groups []*Group

	for _, g := range responses {
		group, err := GroupFromStorageType(&g)
		if err != nil {
			return nil, status.Errorf(codes.Internal, "could not get groups : %v", err)
		}
		groups = append(groups, group)
	}
	return &GetGroupsBatchResponse{Groups: groups}, nil
}
func (s GroupsManagementServerImpl) Subscribe(ctx context.Context, req *SubscribeRequest) (*SubscribeResponse, error) {
	err := s.handler.Subscribe(req.Groupid, req.Memberid)
	if err != nil {
		return nil, status.Errorf(codes.AlreadyExists, "could not subscribe : %v", err)
	}
	return &SubscribeResponse{
		Ok: true,
	}, nil

}
func (s GroupsManagementServerImpl) Unsubscribe(context.Context, *UnsubscribeRequest) (*UnsubscribeResponse, error) {
	return nil, status.Errorf(codes.Unimplemented, "method Unsubscribe not implemented")
}
func (s GroupsManagementServerImpl) mustEmbedUnimplementedGroupsManagementServer() {}

func Run(done chan error, cfg *viper.Viper, handler handlers.GroupsManagementHandler) {
	var (
		dev_env = cfg.GetBool("dev_env")
		address = ":" + cfg.GetString("services.grpc.port")
	)
	fmt.Println("-> GRPC server on", address)

	server := grpc.NewServer()
	RegisterGroupsManagementServer(server, NewGroupsManagementServer(handler))
	l, err := net.Listen("tcp", address)
	if err != nil {
		log.Fatal(err)
	}

	if dev_env {
		reflection.Register(server)
	}

	if err := server.Serve(l); err != nil {
		fmt.Println("gRPC service ended")
		done <- err
	}
}