reworked api interfaces

pkg/garth/auth/credentials/credentials.go

@@ -0,0 +1,37 @@
+package auth
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/joho/godotenv"
+)
+
+// LoadEnvCredentials loads credentials from .env file
+func LoadEnvCredentials() (email, password, domain string, err error) {
+	// Determine project root (assuming .env is in the project root)
+	projectRoot := "/home/sstent/Projects/go-garth"
+	envPath := filepath.Join(projectRoot, ".env")
+
+	// Load .env file
+	if err := godotenv.Load(envPath); err != nil {
+		return "", "", "", fmt.Errorf("error loading .env file from %s: %w", envPath, err)
+	}
+
+	email = os.Getenv("GARMIN_EMAIL")
+	password = os.Getenv("GARMIN_PASSWORD")
+	domain = os.Getenv("GARMIN_DOMAIN")
+
+	if email == "" {
+		return "", "", "", fmt.Errorf("GARMIN_EMAIL not found in .env file")
+	}
+	if password == "" {
+		return "", "", "", fmt.Errorf("GARMIN_PASSWORD not found in .env file")
+	}
+	if domain == "" {
+		domain = "garmin.com" // default value
+	}
+
+	return email, password, domain, nil
+}

pkg/garth/auth/credentials/doc.go

@@ -0,0 +1,4 @@
+// Package credentials provides helpers for loading user credentials and
+// environment configuration used during authentication and local development.
+// Note: This is an internal package and not intended for direct external use.
+package auth