/*
Copyright 2021 Gravitational, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package services

import (
	"github.com/gravitational/trace"

	"github.com/gravitational/teleport/api/types"
	"github.com/gravitational/teleport/lib/utils"
)

// MarshalDatabaseServer marshals the DatabaseServer resource to JSON.
func MarshalDatabaseServer(databaseServer types.DatabaseServer, opts ...MarshalOption) ([]byte, error) {
	if err := databaseServer.CheckAndSetDefaults(); err != nil {
		return nil, trace.Wrap(err)
	}

	cfg, err := CollectOptions(opts)
	if err != nil {
		return nil, trace.Wrap(err)
	}

	switch databaseServer := databaseServer.(type) {
	case *types.DatabaseServerV3:
		if !cfg.PreserveResourceID {
			// avoid modifying the original object
			// to prevent unexpected data races
			copy := *databaseServer
			copy.SetResourceID(0)
			databaseServer = &copy
		}
		return utils.FastMarshal(databaseServer)
	default:
		return nil, trace.BadParameter("unrecognized database server version %T", databaseServer)
	}
}

// UnmarshalDatabaseServer unmarshals the DatabaseServer resource from JSON.
func UnmarshalDatabaseServer(data []byte, opts ...MarshalOption) (types.DatabaseServer, error) {
	if len(data) == 0 {
		return nil, trace.BadParameter("missing database server data")
	}
	cfg, err := CollectOptions(opts)
	if err != nil {
		return nil, trace.Wrap(err)
	}
	var h types.ResourceHeader
	if err := utils.FastUnmarshal(data, &h); err != nil {
		return nil, trace.Wrap(err)
	}
	switch h.Version {
	case types.V3:
		var s types.DatabaseServerV3
		if err := utils.FastUnmarshal(data, &s); err != nil {
			return nil, trace.BadParameter(err.Error())
		}
		if err := s.CheckAndSetDefaults(); err != nil {
			return nil, trace.Wrap(err)
		}
		if cfg.ID != 0 {
			s.SetResourceID(cfg.ID)
		}
		if !cfg.Expires.IsZero() {
			s.SetExpiry(cfg.Expires)
		}
		return &s, nil
	}
	return nil, trace.BadParameter("database server resource version %q is not supported", h.Version)
}