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// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 kibana

import (
	"encoding/json"
	"fmt"

	"github.com/elastic/beats/libbeat/common"
)

// RemoveIndexPattern removes the index pattern entry from a given dashboard export
func RemoveIndexPattern(data []byte) (common.MapStr, error) {

	var kbResult struct {
		// Has to be defined as interface instead of Type directly as it has to be assigned again
		// and otherwise would not contain the full content.
		Objects []common.MapStr
	}

	var result common.MapStr
	// Full struct need to not loose any data
	err := json.Unmarshal(data, &result)
	if err != nil {
		return nil, err
	}

	// For easier handling, unmarshal into predefined struct
	err = json.Unmarshal(data, &kbResult)
	if err != nil {
		return nil, err
	}

	var objs []interface{}

	for _, obj := range kbResult.Objects {
		v, err := obj.GetValue("type")
		if err != nil {
			return nil, fmt.Errorf("type key not found or not string")
		}
		if v != "index-pattern" {
			objs = append(objs, obj)
		}
	}

	result["objects"] = objs

	return result, nil
}