Centralize env vars loading

backend/internal/config/config.go

@@ -0,0 +1,67 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type Config struct {
+	DBPath        string
+	WorkDir       string
+	StaticPath    string
+	Port          string
+	AdminEmail    string
+	AdminPassword string
+}
+
+func DefaultConfig() *Config {
+	return &Config{
+		DBPath:     "./novamd.db",
+		WorkDir:    "./data",
+		StaticPath: "../frontend/dist",
+		Port:       "8080",
+	}
+}
+
+// Load creates a new Config instance with values from environment variables
+func Load() (*Config, error) {
+	config := DefaultConfig()
+
+	if dbPath := os.Getenv("NOVAMD_DB_PATH"); dbPath != "" {
+		config.DBPath = dbPath
+	}
+	if err := ensureDir(filepath.Dir(config.DBPath)); err != nil {
+		return nil, fmt.Errorf("failed to create database directory: %w", err)
+	}
+
+	if workDir := os.Getenv("NOVAMD_WORKDIR"); workDir != "" {
+		config.WorkDir = workDir
+	}
+	if err := ensureDir(config.WorkDir); err != nil {
+		return nil, fmt.Errorf("failed to create work directory: %w", err)
+	}
+
+	if staticPath := os.Getenv("NOVAMD_STATIC_PATH"); staticPath != "" {
+		config.StaticPath = staticPath
+	}
+
+	if port := os.Getenv("NOVAMD_PORT"); port != "" {
+		config.Port = port
+	}
+
+	config.AdminEmail = os.Getenv("NOVAMD_ADMIN_EMAIL")
+	config.AdminPassword = os.Getenv("NOVAMD_ADMIN_PASSWORD")
+	if config.AdminEmail == "" || config.AdminPassword == "" {
+		return nil, fmt.Errorf("NOVAMD_ADMIN_EMAIL and NOVAMD_ADMIN_PASSWORD must be set")
+	}
+
+	return config, nil
+}
+
+func ensureDir(dir string) error {
+	if dir == "" {
+		return nil
+	}
+	return os.MkdirAll(dir, 0755)
+}