feat: complete go rewrite

internal/config/config.go

@@ -0,0 +1,81 @@
+package config
+
+import (
+	"log"
+	"os"
+	"strconv"
+
+	"github.com/joho/godotenv"
+)
+
+type Config struct {
+	Port           string
+	PGHost         string
+	PGPort         string
+	PGUser         string
+	PGPassword     string
+	PGDatabase     string
+	SMTPServer     string
+	SMTPPort       int
+	SMTPUser       string
+	SMTPPassword   string
+	SenderEmail    string
+	AdminUsername  string
+	AdminPassword  string
+	SecretKey      string
+	BaseURL        string
+}
+
+var Current *Config
+
+func Load() *Config {
+	if err := godotenv.Load(); err != nil {
+		log.Println("No .env file found, using environment variables")
+	}
+
+	cfg := &Config{
+		Port:          getEnv("PORT", "5001"),
+		PGHost:        getEnv("PG_HOST", "localhost"),
+		PGPort:        getEnv("PG_PORT", "5432"),
+		PGUser:        getEnv("PG_USER", "postgres"),
+		PGPassword:    getEnv("PG_PASSWORD", ""),
+		PGDatabase:    getEnv("PG_DATABASE", "newsletter"),
+		SMTPServer:    getEnv("SMTP_SERVER", ""),
+		SMTPPort:      getEnvInt("SMTP_PORT", 465),
+		SMTPUser:      getEnv("SMTP_USER", ""),
+		SMTPPassword:  getEnv("SMTP_PASSWORD", ""),
+		SenderEmail:   getEnv("SENDER_EMAIL", ""),
+		AdminUsername: getEnv("ADMIN_USERNAME", "admin"),
+		AdminPassword: getEnv("ADMIN_PASSWORD", "changeme"),
+		SecretKey:     getEnv("SECRET_KEY", "your-secret-key"),
+		BaseURL:       getEnv("BASE_URL", "localhost:5001"),
+	}
+
+	if cfg.SenderEmail == "" {
+		cfg.SenderEmail = cfg.SMTPUser
+	}
+
+	Current = cfg
+	return cfg
+}
+
+func getEnv(key, defaultValue string) string {
+	value := os.Getenv(key)
+	if value == "" {
+		return defaultValue
+	}
+	return value
+}
+
+func getEnvInt(key string, defaultValue int) int {
+	value := os.Getenv(key)
+	if value == "" {
+		return defaultValue
+	}
+	intVal, err := strconv.Atoi(value)
+	if err != nil {
+		log.Printf("Invalid integer for %s: %v", key, err)
+		return defaultValue
+	}
+	return intVal
+}