package config

import (
	"os"
	"strconv"
)

type Config struct {
	Server ServerConfig
	Auth   AuthConfig
	DB     DBConfig
}

type ServerConfig struct {
	Port int
}

type AuthConfig struct {
	Username string
	Password string
	Secret   string
}

type DBConfig struct {
	DSN string
}

func Load() *Config {
	return &Config{
		Server: ServerConfig{
			Port: getEnvInt("ENERGY_PORT", 8080),
		},
		Auth: AuthConfig{
			Username: getEnv("ENERGY_AUTH_USER", "admin"),
			Password: getEnv("ENERGY_AUTH_PASSWORD", ""),
			Secret:   getEnv("ENERGY_AUTH_SECRET", "change-me-in-production"),
		},
		DB: DBConfig{
			DSN: getEnv("ENERGY_DB_DSN", "postgres://energy:changeme@localhost:5433/energy"),
		},
	}
}

func getEnv(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}

func getEnvInt(key string, fallback int) int {
	if v := os.Getenv(key); v != "" {
		if i, err := strconv.Atoi(v); err == nil {
			return i
		}
	}
	return fallback
}