package cli

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

	"github.com/sercand/kuberesolver/v5"
	br "github.com/tidbcloud/serverless-service/idl/pbgen/proto/rpc"
	tigrpc "github.com/tidbcloud/tiinf/transport/tigrpc/client"

	"github.com/tidbcloud/tidb-management-service/serverless-global-service/pkg/config"
	"github.com/tidbcloud/tidb-management-service/utilities/bizerr"
	grpcutil "github.com/tidbcloud/tidb-management-service/utilities/grpc"
)

var (
	serverlessBRSvcOnce sync.Once
	serverlessBRSvcCli  br.BackupRestoreServiceClient
)

func getBRSvcClient() br.BackupRestoreServiceClient {
	serverlessBRSvcOnce.Do(func() {
		addr := config.Global().ServerConfig.DependentSvcAddresses.Serverless
		timeoutMs := config.Global().ServerConfig.DependentSvcAddresses.WaitTimeoutInMilliSec
		opts := []tigrpc.Option{
			tigrpc.WithPrometheus(),
			tigrpc.WithTracing(),
			tigrpc.WithUnaryInterceptors(
				grpcutil.ClientPayloadLogInterceptor,
				grpcutil.TimeoutInterceptor(time.Duration(timeoutMs)*time.Millisecond),
			),
		}
		if strings.HasPrefix(addr, "kubernetes://") {
			kuberesolver.RegisterInCluster()
			opts = append(opts, tigrpc.WithLoadBalance())
		}
		conn, err := tigrpc.NewClientConn(addr, opts...)
		if err != nil {
			panic(fmt.Sprintf("dial serverless-svc: %s", err))
		}
		serverlessBRSvcCli = br.NewBackupRestoreServiceClient(conn)
	})

	return serverlessBRSvcCli
}

func UpdateBackupSchedule(ctx context.Context, req *br.UpdateBackupPolicyRequest) bizerr.BizError {
	_, err := getBRSvcClient().UpdateBackupPolicy(ctx, req)
	if err != nil {
		return bizerr.WrapGrpcError(err, "update backup schedule failed")
	}
	return nil
}

func ListAutoBackupSetting(
	ctx context.Context,
	req *br.ListBackupPoliciesRequest,
) ([]*br.BackupPolicy, bizerr.BizError) {
	resp, err := getBRSvcClient().ListBackupPolicies(ctx, req)
	if err != nil {
		return nil, bizerr.WrapGrpcError(err, "get auto backup setting failed")
	}

	return resp.GetBackupPolicies(), nil
}