// Package config handles application configuration from environment variables.
package config

import (
	"os"
	"strconv"
)

// Config holds all application configuration.
type Config struct {
	Port        string
	DatabaseURL string
	Environment string
}

// Load reads configuration from environment variables with sensible defaults.
func Load() *Config {
	return &Config{
		Port:        getEnv("PORT", "8080"),
		DatabaseURL: getEnv("DATABASE_URL", "postgres://flowreader:flowreader@db:5432/flowreader?sslmode=disable"),
		Environment: getEnv("ENV", "development"),
	}
}

// getEnv returns the value of an environment variable or a default value.
func getEnv(key, defaultValue string) string {
	if value, exists := os.LookupEnv(key); exists {
		return value
	}
	return defaultValue
}

// getEnvInt returns an integer environment variable or a default value.
func getEnvInt(key string, defaultValue int) int {
	if value, exists := os.LookupEnv(key); exists {
		if intValue, err := strconv.Atoi(value); err == nil {
			return intValue
		}
	}
	return defaultValue
}