// Copyright © 2023 OpenIM. All rights reserved.
//
// 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 zookeeper

import (
	"os"
	"strings"
)

// getEnv returns the value of an environment variable if it exists, otherwise it returns the fallback value.
func getEnv(key, fallback string) string {
	if value, exists := os.LookupEnv(key); exists {
		return value
	}
	return fallback
}

// getZkAddrFromEnv returns the Zookeeper addresses combined from the ZOOKEEPER_ADDRESS and ZOOKEEPER_PORT environment variables.
// If the environment variables are not set, it returns the fallback value.
func getZkAddrFromEnv(fallback []string) []string {
	address, addrExists := os.LookupEnv("ZOOKEEPER_ADDRESS")
	port, portExists := os.LookupEnv("ZOOKEEPER_PORT")

	if addrExists && portExists {
		addresses := strings.Split(address, ",")
		for i, addr := range addresses {
			addresses[i] = addr + ":" + port
		}
		return addresses
	}
	return fallback
}