package utils

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

// FormatTime formats time in a standard format
func FormatTime(t time.Time) string {
	return t.Format(time.RFC3339)
}

// GetEnvOrDefault returns environment variable value or default if not set
func GetEnvOrDefault(key, defaultValue string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return defaultValue
}

// GetEnvOrDefaultInt returns environment variable as int or default if not set/invalid
func GetEnvOrDefaultInt(key string, defaultValue int) int {
	if value := os.Getenv(key); value != "" {
		if intValue, err := strconv.Atoi(value); err == nil {
			return intValue
		}
	}
	return defaultValue
}

// GetEnvOrDefaultBool returns environment variable as bool or default if not set/invalid
func GetEnvOrDefaultBool(key string, defaultValue bool) bool {
	if value := os.Getenv(key); value != "" {
		if boolValue, err := strconv.ParseBool(value); err == nil {
			return boolValue
		}
	}
	return defaultValue
}

// GetEnvOrDefaultDuration returns environment variable as duration or default if not set/invalid
func GetEnvOrDefaultDuration(key string, defaultValue time.Duration) time.Duration {
	if value := os.Getenv(key); value != "" {
		if duration, err := time.ParseDuration(value); err == nil {
			return duration
		}
	}
	return defaultValue
}

// MustGetEnv returns environment variable value or panics if not set
func MustGetEnv(key string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	panic("Required environment variable not set: " + key)
}

// IsEnvSet checks if an environment variable is set (even if empty)
func IsEnvSet(key string) bool {
	_, exists := os.LookupEnv(key)
	return exists
}