// Copyright 2018 Google LLC
//
// 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 bigquery

import (
	"crypto/rand"
	"encoding/hex"
)

// Support for random values (typically job IDs and insert IDs).

// For testing.
var randomIDFn = randomID

func randomID() string {
	var b [16]byte
	if _, err := rand.Read(b[:]); err != nil {
		panic("bigquery: failed to generate random ID: " + err.Error())
	}
	return hex.EncodeToString(b[:]) // 32 alphanumeric hex characters (e.g. "4a7f9c2d1e8b3a0f...")
}

// Seed is a no-op.
//
// Deprecated: Seed is no longer supported as random IDs are now cryptographically secure.
func Seed(s int64) {}
