package dedicated

import (
	"context"
	"fmt"
	"strings"
	"sync"
	"time"

	"github.com/sercand/kuberesolver/v5"
	tigrpc "github.com/tidbcloud/tiinf/transport/tigrpc/client"
	"google.golang.org/grpc"
	"google.golang.org/protobuf/types/known/emptypb"

	globaldedicatedv1 "github.com/tidbcloud/tidb-management-service/api/spec/global/dedicated/v1"
	"github.com/tidbcloud/tidb-management-service/tempo-wrapper/internal/config"
	grpcutil "github.com/tidbcloud/tidb-management-service/utilities/grpc"
)

var (
	dedicatedGlobalVpcSvcOnce sync.Once
	dedicatedGlobalVpcSvcCli  globaldedicatedv1.VpcServiceClient
)

func getDedicatedGlobalVpcClient() globaldedicatedv1.VpcServiceClient {
	dedicatedGlobalVpcSvcOnce.Do(func() {
		timeout := time.Duration(config.Config().Grpc.Timeout) * time.Second
		ctx, cancel := context.WithTimeout(context.Background(), timeout)
		defer cancel()

		addr := config.Config().Grpc.DedicatedGlobalAddr
		interceptors := []grpc.UnaryClientInterceptor{
			grpcutil.TimeoutInterceptor(timeout),
			grpcutil.ClientPayloadLogInterceptor,
		}
		opts := []tigrpc.Option{
			tigrpc.WithDefault(),
			tigrpc.WithUnaryInterceptors(interceptors...),
		}
		if strings.HasPrefix(addr, "kubernetes://") {
			kuberesolver.RegisterInCluster()
			opts = append(opts, tigrpc.WithLoadBalance())
		}

		conn, err := tigrpc.NewClientContext(ctx, addr, opts...)
		if err != nil {
			panic(fmt.Sprintf("dial dedicated vpc service: %s", err))
		}
		dedicatedGlobalVpcSvcCli = globaldedicatedv1.NewVpcServiceClient(conn)
	})

	return dedicatedGlobalVpcSvcCli
}

func CreateCidr(
	ctx context.Context,
	req *globaldedicatedv1.CreateCidrRequest,
) (*globaldedicatedv1.CreateCidrResponse, error) {
	return getDedicatedGlobalVpcClient().CreateCidr(ctx, req)
}

func QueryCidrs(
	ctx context.Context,
	req *globaldedicatedv1.QueryCidrsRequest,
) (*globaldedicatedv1.QueryCidrsResponse, error) {
	return getDedicatedGlobalVpcClient().QueryCidrs(ctx, req)
}

func UpdateCidr(
	ctx context.Context,
	req *globaldedicatedv1.UpdateCidrRequest,
) (*globaldedicatedv1.UpdateCidrResponse, error) {
	return getDedicatedGlobalVpcClient().UpdateCidr(ctx, req)
}

func DeleteCidr(ctx context.Context, req *globaldedicatedv1.DeleteCidrRequest) (*emptypb.Empty, error) {
	return getDedicatedGlobalVpcClient().DeleteCidr(ctx, req)
}

func GetDefaultCidr(
	ctx context.Context,
	req *globaldedicatedv1.GetDefaultCidrRequest,
) (*globaldedicatedv1.GetDefaultCidrResponse, error) {
	return getDedicatedGlobalVpcClient().GetDefaultCidr(ctx, req)
}