saveinmed/backend/internal/config/config.go

package config

import (
	"fmt"
	"os"
	"strconv"
	"strings"
	"time"

	"github.com/joho/godotenv"
)

// Config centralizes runtime configuration loaded from the environment.
type Config struct {
	AppName                string
	Port                   string
	DatabaseURL            string
	MercadoPagoBaseURL     string
	MercadoPagoAccessToken string
	MarketplaceCommission  float64
	BuyerFeeRate           float64 // Fee rate applied to buyer prices (e.g., 0.12 = 12%)
	JWTSecret              string
	JWTExpiresIn           time.Duration
	PasswordPepper         string
	CORSOrigins            []string
	BackendHost            string
	SwaggerSchemes         []string
	AdminName              string
	AdminUsername          string
	AdminEmail             string
	AdminPassword          string
	MercadoPagoPublicKey   string
	MapboxAccessToken      string
}

// Load reads configuration from environment variables and applies sane defaults
// for local development.
func Load() (*Config, error) {
	_ = godotenv.Load() // Load from .env if present

	cfg := Config{
		AppName:                getEnv("APP_NAME", "saveinmed-performance-core"),
		Port:                   getEnv("BACKEND_PORT", "8214"),
		DatabaseURL:            getEnv("DATABASE_URL", "postgres://postgres:postgres@localhost:5432/saveinmed?sslmode=disable"),
		MercadoPagoBaseURL:     getEnv("MERCADOPAGO_BASE_URL", "https://api.mercadopago.com"),
		MercadoPagoAccessToken: getEnv("MERCADOPAGO_ACCESS_TOKEN", "TEST-00000000-0000-0000-0000-000000000000"), // Default dummy
		MarketplaceCommission:  getEnvFloat("MARKETPLACE_COMMISSION", 2.5),
		BuyerFeeRate:           getEnvFloat("BUYER_FEE_RATE", 0.12), // 12% invisible fee
		JWTSecret:              getEnv("JWT_SECRET", "dev-secret"),
		JWTExpiresIn:           getEnvDuration("JWT_EXPIRES_IN", 24*time.Hour),
		PasswordPepper:         getEnv("PASSWORD_PEPPER", ""),
		CORSOrigins:            getEnvStringSlice("CORS_ORIGINS", []string{"*"}),
		BackendHost:            getEnv("BACKEND_HOST", ""),
		SwaggerSchemes:         getEnvStringSlice("SWAGGER_SCHEMES", []string{"http"}),
		AdminName:              getEnv("ADMIN_NAME", "Administrator"),
		AdminUsername:          getEnv("ADMIN_USERNAME", "admin"),
		AdminEmail:             getEnv("ADMIN_EMAIL", "admin@saveinmed.com"),
		AdminPassword:          getEnv("ADMIN_PASSWORD", "admin123"),
		MercadoPagoPublicKey:   getEnv("MERCADOPAGO_PUBLIC_KEY", "TEST-PUBLIC-KEY"),
		MapboxAccessToken:      getEnv("MAPBOX_ACCESS_TOKEN", ""),
	}

	return &cfg, nil
}

// Addr returns the address binding for the HTTP server.
func (c Config) Addr() string {
	return fmt.Sprintf(":%s", c.Port)
}

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

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

func getEnvDuration(key string, fallback time.Duration) time.Duration {
	if value := os.Getenv(key); value != "" {
		if parsed, err := time.ParseDuration(value); err == nil {
			return parsed
		}
	}
	return fallback
}

func getEnvFloat(key string, fallback float64) float64 {
	if value := os.Getenv(key); value != "" {
		if parsed, err := strconv.ParseFloat(value, 64); err == nil {
			return parsed
		}
	}
	return fallback
}

func getEnvStringSlice(key string, fallback []string) []string {
	if value := os.Getenv(key); value != "" {
		parts := strings.Split(value, ",")
		result := make([]string, 0, len(parts))
		for _, p := range parts {
			if trimmed := strings.TrimSpace(p); trimmed != "" {
				result = append(result, trimmed)
			}
		}
		if len(result) > 0 {
			return result
		}
	}
	return fallback
}