// Package envutil provides environment variable parsing helpers with fallback values.
package envutil

import (
	"os"
	"strconv"
	"time"
)

// String returns the environment variable value or fallback when empty.
func String(key string, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}

// Int returns the parsed integer environment variable or fallback on parse error.
func Int(key string, fallback int) int {
	v := os.Getenv(key)
	if v == "" {
		return fallback
	}

	i, err := strconv.Atoi(v)
	if err != nil {
		return fallback
	}

	return i
}

// Duration returns the parsed duration environment variable or fallback on parse error.
func Duration(key string, fallback time.Duration) time.Duration {
	v := os.Getenv(key)
	if v == "" {
		return fallback
	}

	d, err := time.ParseDuration(v)
	if err != nil {
		return fallback
	}

	return d
}