package openapi

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

	"github.com/sercand/kuberesolver/v5"
	openapilegacy "github.com/tidbcloud/idl/pbgen/proto/openapi/cm"
	tigrpc "github.com/tidbcloud/tiinf/transport/tigrpc/client"
	"google.golang.org/grpc"
	"google.golang.org/protobuf/types/known/emptypb"

	"github.com/tidbcloud/tidb-management-service/tempo-wrapper/internal/config"
	grpcutil "github.com/tidbcloud/tidb-management-service/utilities/grpc"
)

var (
	openapiSvcOnce sync.Once
	openapiSvcCli  openapilegacy.ClusterClient
)

func getOpenapiSvcClient() openapilegacy.ClusterClient {
	openapiSvcOnce.Do(func() {
		timeout := time.Duration(config.Config().Grpc.Timeout) * time.Second
		ctx, cancel := context.WithTimeout(context.Background(), timeout)
		defer cancel()

		addr := config.Config().Grpc.CorePortalAddr
		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 mgmt-serverless-svc: %s", err))
		}
		openapiSvcCli = openapilegacy.NewClusterClient(conn)
	})

	return openapiSvcCli
}

func ListOpenAPIRegion(ctx context.Context) (*openapilegacy.ListProviderRegionsResp, error) {
	client := getOpenapiSvcClient()

	resp, err := client.ListProviderRegions(ctx, &emptypb.Empty{})
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func ListClustersOfProject(
	ctx context.Context,
	req *openapilegacy.ListClustersOfProjectReq,
) (*openapilegacy.ListClustersOfProjectResp, error) {
	client := getOpenapiSvcClient()

	resp, err := client.ListClustersOfProject(ctx, req)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func GetCluster(ctx context.Context, req *openapilegacy.GetClusterReq) (*openapilegacy.ClusterItem, error) {
	client := getOpenapiSvcClient()

	resp, err := client.GetCluster(ctx, req)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func UpdateCluster(ctx context.Context, req *openapilegacy.UpdateClusterReq) (*emptypb.Empty, error) {
	client := getOpenapiSvcClient()

	resp, err := client.UpdateCluster(ctx, req)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func DeleteCluster(ctx context.Context, req *openapilegacy.DeleteClusterReq) (*emptypb.Empty, error) {
	client := getOpenapiSvcClient()

	resp, err := client.DeleteCluster(ctx, req)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func CreateCluster(ctx context.Context, req *openapilegacy.CreateClusterReq) (*openapilegacy.CreateClusterResp, error) {
	client := getOpenapiSvcClient()

	resp, err := client.CreateCluster(ctx, req)
	if err != nil {
		return nil, err
	}
	return resp, nil
}