package cmd

import (
	"context"
	"fmt"
	"strings"

	"github.com/spf13/cobra"
	"github.com/tidbcloud/dataflow-service/app/container"
	"github.com/tidbcloud/dataflow-service/internal/cmd/bootstrap/server"
	"github.com/tidbcloud/dataflow-service/pkg/log"
	openapi "github.com/tidbcloud/tidb-management-service/api/spec/tidb_cloud_open_api/common/v1beta1"
	mgmt "github.com/tidbcloud/tidb-management-service/api/spec/tidb_mgmt_service/v1"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
)

type customStatusCreateOptions struct {
	clusterID      uint64
	statusType     string
	statusName     string
	overrideStatus string
	timeoutSecs    int64
	blockActions   []string
}

func (o customStatusCreateOptions) request() (*mgmt.SetClusterCustomStatusRequest, error) {
	if err := validateClusterID(o.clusterID); err != nil {
		return nil, err
	}
	statusName := strings.TrimSpace(o.statusName)
	if statusName == "" {
		return nil, fmt.Errorf("status-name is required")
	}
	if o.timeoutSecs < 0 {
		return nil, fmt.Errorf("timeout-secs must not be negative")
	}

	statusType, err := parseCustomStatusType(o.statusType)
	if err != nil {
		return nil, err
	}
	overrideStatus, err := parseClusterState(o.overrideStatus)
	if err != nil {
		return nil, err
	}
	blockActions, err := parseClusterActions(o.blockActions)
	if err != nil {
		return nil, err
	}

	status := &mgmt.ClusterCustomStatus{
		ClusterId:      o.clusterID,
		StatusName:     statusName,
		StatusType:     statusType,
		OverrideStatus: overrideStatus,
	}
	if o.timeoutSecs > 0 {
		status.TimeoutSecs = &o.timeoutSecs
	}
	if len(blockActions) > 0 {
		status.Mutex = &mgmt.ClusterCustomStatus_CustomMutex{
			ClusterAction: blockActions,
		}
	}
	return &mgmt.SetClusterCustomStatusRequest{CustomStatus: status}, nil
}

func parseCustomStatusType(value string) (mgmt.CustomStatusType, error) {
	name := strings.ToUpper(strings.TrimSpace(value))
	if !strings.HasPrefix(name, "CUSTOM_STATUS_TYPE_") {
		name = "CUSTOM_STATUS_TYPE_" + name
	}
	valueNumber, ok := mgmt.CustomStatusType_value[name]
	if !ok || valueNumber == int32(mgmt.CustomStatusType_CUSTOM_STATUS_TYPE_UNSPECIFIED) {
		return mgmt.CustomStatusType_CUSTOM_STATUS_TYPE_UNSPECIFIED,
			fmt.Errorf("invalid status-type %q", value)
	}
	return mgmt.CustomStatusType(valueNumber), nil
}

func parseClusterState(value string) (*openapi.ClusterState, error) {
	name := strings.ToUpper(strings.TrimSpace(value))
	if name == "" {
		return nil, nil
	}
	if !strings.HasPrefix(name, "CLUSTER_STATE_") && name == "UNSPECIFIED" {
		name = "CLUSTER_STATE_" + name
	}
	valueNumber, ok := openapi.ClusterState_value[name]
	if !ok {
		return nil, fmt.Errorf("invalid override-status %q", value)
	}
	state := openapi.ClusterState(valueNumber)
	return &state, nil
}

func parseClusterActions(values []string) ([]mgmt.ClusterAction, error) {
	actions := make([]mgmt.ClusterAction, 0, len(values))
	for _, value := range values {
		name := strings.ToUpper(strings.TrimSpace(value))
		if !strings.HasPrefix(name, "CLUSTER_ACTION_") {
			name = "CLUSTER_ACTION_" + name
		}
		valueNumber, ok := mgmt.ClusterAction_value[name]
		if !ok || valueNumber == int32(mgmt.ClusterAction_CLUSTER_ACTION_UNSPECIFIED) {
			return nil, fmt.Errorf("invalid block-action %q", value)
		}
		actions = append(actions, mgmt.ClusterAction(valueNumber))
	}
	return actions, nil
}

func validateClusterID(clusterID uint64) error {
	if clusterID == 0 {
		return fmt.Errorf("cluster-id must be greater than zero")
	}
	return nil
}

func initializeCustomStatusJob(ctx context.Context) (context.Context, error) {
	if _, err := server.NewServer(ctx, server.ServerOption{EnableEventBusConsumer: false}); err != nil {
		return nil, err
	}
	return log.WithTraceID(ctx), nil
}

func writeProtoJSON(cmd *cobra.Command, message proto.Message) error {
	output, err := protojson.MarshalOptions{Indent: "  "}.Marshal(message)
	if err != nil {
		return fmt.Errorf("marshal response: %w", err)
	}
	_, err = fmt.Fprintln(cmd.OutOrStdout(), string(output))
	return err
}

func newCustomStatusCreateCommand() *cobra.Command {
	options := customStatusCreateOptions{}
	cmd := &cobra.Command{
		Use:   "create",
		Short: "create a cluster custom status",
		RunE: func(cmd *cobra.Command, _ []string) error {
			request, err := options.request()
			if err != nil {
				return err
			}
			ctx, err := initializeCustomStatusJob(cmd.Context())
			if err != nil {
				return err
			}
			status, bizErr := container.Global().MgmtSvcGrpcClient.SetClusterCustomStatus(ctx, request)
			if bizErr != nil {
				return bizErr.Chain("create custom status")
			}
			return writeProtoJSON(cmd, status)
		},
	}
	cmd.Flags().Uint64Var(&options.clusterID, "cluster-id", 0, "cluster ID")
	cmd.Flags().StringVar(&options.statusType, "status-type", "", "custom status type, for example PITR")
	cmd.Flags().StringVar(&options.statusName, "status-name", "", "unique custom status name for the cluster and type")
	cmd.Flags().StringVar(&options.overrideStatus, "override-status", "", "optional cluster state override, for example MAINTENANCE")
	cmd.Flags().Int64Var(&options.timeoutSecs, "timeout-secs", 0, "optional custom status timeout in seconds")
	cmd.Flags().StringSliceVar(&options.blockActions, "block-action", nil, "cluster action to block while this status exists; repeat or separate values with commas")
	return cmd
}

func newCustomStatusDeleteCommand() *cobra.Command {
	var clusterID, statusID uint64
	cmd := &cobra.Command{
		Use:   "delete",
		Short: "delete a cluster custom status by ID",
		RunE: func(cmd *cobra.Command, _ []string) error {
			if err := validateClusterID(clusterID); err != nil {
				return err
			}
			if statusID == 0 {
				return fmt.Errorf("status-id must be greater than zero")
			}
			ctx, err := initializeCustomStatusJob(cmd.Context())
			if err != nil {
				return err
			}
			if err := container.Global().MgmtSvcGrpcClient.DeleteClusterCustomStatus(ctx, &mgmt.DeleteClusterCustomStatusRequest{
				ClusterId: clusterID,
				StatusId:  statusID,
			}); err != nil {
				return err.Chain("delete custom status")
			}
			_, err = fmt.Fprintf(cmd.OutOrStdout(), "deleted custom status %d from cluster %d\n", statusID, clusterID)
			return err
		},
	}
	cmd.Flags().Uint64Var(&clusterID, "cluster-id", 0, "cluster ID")
	cmd.Flags().Uint64Var(&statusID, "status-id", 0, "custom status ID")
	return cmd
}

func newCustomStatusQueryCommand() *cobra.Command {
	var clusterID uint64
	var statusType string
	cmd := &cobra.Command{
		Use:   "query",
		Short: "query cluster custom statuses by type",
		RunE: func(cmd *cobra.Command, _ []string) error {
			if err := validateClusterID(clusterID); err != nil {
				return err
			}
			parsedStatusType, err := parseCustomStatusType(statusType)
			if err != nil {
				return err
			}
			ctx, err := initializeCustomStatusJob(cmd.Context())
			if err != nil {
				return err
			}
			response, bizErr := container.Global().MgmtSvcGrpcClient.IsClusterCustomStatusExisted(ctx, &mgmt.IsClusterCustomStatusExistedRequest{
				ClusterId:  clusterID,
				StatusType: parsedStatusType,
			})
			if bizErr != nil {
				return bizErr.Chain("query custom status")
			}
			return writeProtoJSON(cmd, response)
		},
	}
	cmd.Flags().Uint64Var(&clusterID, "cluster-id", 0, "cluster ID")
	cmd.Flags().StringVar(&statusType, "status-type", "", "custom status type, for example PITR")
	return cmd
}

func newCustomStatusCommand() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "custom_status",
		Short: "manage cluster custom statuses",
	}
	cmd.AddCommand(
		newCustomStatusCreateCommand(),
		newCustomStatusDeleteCommand(),
		newCustomStatusQueryCommand(),
	)
	return cmd
}

func init() {
	jobCmd.AddCommand(newCustomStatusCommand())
}