// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2016 Datadog, Inc.

package internal

import (
	"os"
	"strconv"
	"time"

	"gopkg.in/DataDog/dd-trace-go.v1/internal/log"
)

// BoolEnv returns the parsed boolean value of an environment variable, or
// def otherwise.
func BoolEnv(key string, def bool) bool {
	vv, ok := os.LookupEnv(key)
	if !ok {
		return def
	}
	v, err := strconv.ParseBool(vv)
	if err != nil {
		log.Warn("Non-boolean value for env var %s, defaulting to %t. Parse failed with error: %v", key, def, err)
		return def
	}
	return v
}

// IntEnv returns the parsed int value of an environment variable, or
// def otherwise.
func IntEnv(key string, def int) int {
	vv, ok := os.LookupEnv(key)
	if !ok {
		return def
	}
	v, err := strconv.Atoi(vv)
	if err != nil {
		log.Warn("Non-integer value for env var %s, defaulting to %d. Parse failed with error: %v", key, def, err)
		return def
	}
	return v
}

// DurationEnv returns the parsed duration value of an environment variable, or
// def otherwise.
func DurationEnv(key string, def time.Duration) time.Duration {
	vv, ok := os.LookupEnv(key)
	if !ok {
		return def
	}
	v, err := time.ParseDuration(vv)
	if err != nil {
		log.Warn("Non-duration value for env var %s, defaulting to %d. Parse failed with error: %v", key, def, err)
		return def
	}
	return v
}