feat: added basic backend features to it

  - Set up API framework (Gin Gonic)
  - Set up ORM/DB library (GORM)
  - Design database schema (Users, Accounts, Transactions, Loans, Goals)
  - Set up database connection and migrations

1 files changed, 54 insertions, 0 deletions

diff --git a/backend/internal/config/config.go b/backend/internal/config/config.go
new file mode 100644
index 0000000..f61f423
--- /dev/null
+++ b/backend/internal/config/config.go
@@ -0,0 +1,54 @@
+package config
+
+import (
+	"log"
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+// Config holds the application configuration
+type Config struct {
+	DatabaseDSN string
+	JWTSecret   string // Secret key for signing JWTs
+	// Add other config fields here later (e.g., server port)
+}
+
+// LoadConfig loads configuration from environment variables or a .env file
+func LoadConfig() (*Config, error) {
+	// Attempt to load .env file (useful for development)
+	// In production, rely on environment variables set directly
+	err := godotenv.Load() // Load .env file from current directory or parent dirs
+	if err != nil {
+		log.Println("No .env file found, relying on environment variables")
+	}
+
+	dsn := os.Getenv("DATABASE_DSN")
+	if dsn == "" {
+		// Set a default for local development if not provided
+		log.Println("DATABASE_DSN not set, using default local PostgreSQL DSN")
+		log.Println("IMPORTANT: Ensure PostgreSQL is running with the correct credentials.")
+		log.Println("Try creating a database 'finance' and setting up a user with the correct permissions.")
+		log.Println("Example commands:")
+		log.Println("  createdb finance")
+		log.Println("  createuser -P -s -e user_name")
+
+		// Use more common/generic default credentials
+		dsn = "host=localhost user=postgres password=postgres dbname=finance port=5432 sslmode=disable TimeZone=UTC"
+		// Consider making the default conditional or removing it for stricter environments
+	}
+
+	jwtSecret := os.Getenv("JWT_SECRET")
+	if jwtSecret == "" {
+		log.Println("WARNING: JWT_SECRET environment variable not set. Using an insecure default.")
+		// !!! IMPORTANT: Use a strong, randomly generated secret in production !!!
+		// For development only:
+		jwtSecret = "insecure-default-dev-secret-change-me"
+		// return nil, errors.New("JWT_SECRET environment variable is required")
+	}
+
+	return &Config{
+		DatabaseDSN: dsn,
+		JWTSecret:   jwtSecret,
+	}, nil
+}