/*******************************************************************************
 * Copyright 2018 - Present Okta, 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,
 * 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 utils

import (
	"bufio"
	"log"
	"os"
	"strings"
)

func ParseEnvironment() {
	if _, err := os.Stat(".env"); os.IsNotExist(err) {
		log.Printf("Environment Variable file (.env) is not present.  Relying on Global Environment Variables")
	}

	setEnvVariable("CLIENT_ID", os.Getenv("CLIENT_ID"))
	setEnvVariable("ISSUER", os.Getenv("ISSUER"))
	setEnvVariable("USERNAME", os.Getenv("USERNAME"))
	setEnvVariable("PASSWORD", os.Getenv("PASSWORD"))
	if os.Getenv("CLIENT_ID") == "" {
		log.Printf("Could not resolve a CLIENT_ID environment variable.")
		os.Exit(1)
	}

	if os.Getenv("ISSUER") == "" {
		log.Printf("Could not resolve a ISSUER environment variable.")
		os.Exit(1)
	}
}

func setEnvVariable(env string, current string) {
	if current != "" {
		return
	}

	file, _ := os.Open(".env")
	defer file.Close()

	lookInFile := bufio.NewScanner(file)
	lookInFile.Split(bufio.ScanLines)

	for lookInFile.Scan() {
		parts := strings.Split(lookInFile.Text(), "=")
		key, value := parts[0], parts[1]
		if key == env {
			os.Setenv(key, value)
		}
	}
}