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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 common

import "math"

// DefaultDecimalPlacesCount is the default number of decimal places
const DefaultDecimalPlacesCount = 4

// Round rounds the given float64 value and ensures that it has a maximum of
// "precision" decimal places.
func Round(val float64, precision int64) (newVal float64) {
	var round float64
	pow := math.Pow(10, float64(precision))
	digit := pow * val
	_, div := math.Modf(digit)
	if div >= 0.5 {
		round = math.Ceil(digit)
	} else {
		round = math.Floor(digit)
	}
	newVal = round / pow
	return
}