// Copyright 2020 PingCAP, 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,
// See the License for the specific language governing permissions and
// limitations under the License.

package owner

import (
	"encoding/json"

	"github.com/pingcap/ticdc/pkg/config"
)

// ChangefeedResp holds the most common usage information for a changefeed
type ChangefeedResp struct {
	FeedState    string               `json:"state"`
	TSO          uint64               `json:"tso"`
	Checkpoint   string               `json:"checkpoint"`
	RunningError *config.RunningError `json:"error"`
}

// MarshalJSON use to marshal ChangefeedResp
func (c ChangefeedResp) MarshalJSON() ([]byte, error) {
	// alias the original type to prevent recursive call of MarshalJSON
	type Alias ChangefeedResp
	if c.FeedState == string(config.StateNormal) {
		c.RunningError = nil
	}
	return json.Marshal(struct {
		Alias
	}{
		Alias: Alias(c),
	})
}