feat: use caarlos0/env for config

internal/config/config.go

@@ -1,56 +1,26 @@
 package config
 
-import "os"
+import (
+	"github.com/caarlos0/env/v11"
+)
 
 // Config holds the application configuration
 type Config struct {
-	ServerAddress  string
-	DatabaseURL    string
-	DatabaseName   string
-	CollectionName string
-	LogLevel       string
-	Environment    string // Added environment field
-	Version        string // Application version
+	ServerAddress  string `env:"MCP_REGISTRY_SERVER_ADDRESS" envDefault:":8080"`
+	DatabaseURL    string `env:"MCP_REGISTRY_DATABASE_URL" envDefault:"mongodb://localhost:27017"`
+	DatabaseName   string `env:"MCP_REGISTRY_DATABASE_NAME" envDefault:"mcp-registry"`
+	CollectionName string `env:"MCP_REGISTRY_COLLECTION_NAME" envDefault:"servers_v2"`
+	LogLevel       string `env:"MCP_REGISTRY_LOG_LEVEL" envDefault:"info"`
+	Environment    string `env:"MCP_REGISTRY_ENVIRONMENT" envDefault:"production"`
+	Version        string `env:"MCP_REGISTRY_VERSION" envDefault:"dev"`
 }
 
 // NewConfig creates a new configuration with default values
 func NewConfig() *Config {
-	// Get environment from OS environment variable or default to "production"
-	env := os.Getenv("APP_ENV")
-	if env == "" {
-		env = "production"
-	}
-
-	// Get version from environment variable or default to "dev"
-	version := os.Getenv("APP_VERSION")
-	if version == "" {
-		version = "dev"
-	}
-
-	// Get database URL from environment variable or default to localhost
-	dbURL := os.Getenv("DATABASE_URL")
-	if dbURL == "" {
-		dbURL = "localhost:5432"
-	}
-
-	// Get database name from environment variable or default to "mcp_registry"
-	dbName := os.Getenv("DATABASE_NAME")
-	if dbName == "" {
-		dbName = "mcp-registry"
-	}
-	// Get collection name from environment variable or default to "entries"
-	collectionName := os.Getenv("COLLECTION_NAME")
-	if collectionName == "" {
-		collectionName = "servers_v2"
-	}
-
-	return &Config{
-		ServerAddress:  ":8080",
-		DatabaseURL:    dbURL,
-		DatabaseName:   dbName,
-		CollectionName: collectionName,
-		LogLevel:       "info",
-		Environment:    env,
-		Version:        version,
+	var cfg Config
+	err := env.Parse(&cfg)
+	if err != nil {
+		panic(err)
 	}
+	return &cfg
 }