Update dependencies and refactor database connection handling

main.go

@@ -5,30 +5,53 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"time"
 
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/joho/godotenv"
+	"github.com/urfave/cli/v2"
 )
 
-func main() {
-	err := godotenv.Load()
-	if err != nil {
-		log.Fatal("Error al cargar el archivo .env")
-	}
+var pool *pgxpool.Pool
+var ctx = context.Background()
 
-	dbpool, err := pgxpool.New(context.Background(), os.Getenv("PG_FROM_DB_URL"))
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "Unable to create connection pool: %v\n", err)
-		os.Exit(1)
-	}
-	defer dbpool.Close()
-
-	var greeting string
-	err = dbpool.QueryRow(context.Background(), "select 'Hello, world!'").Scan(&greeting)
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "QueryRow failed: %v\n", err)
-		os.Exit(1)
-	}
-
-	fmt.Println(greeting)
+type Task struct {
+	Id        int       `json:"id"`
+	Text      string    `json:"text"`
+	Completed bool      `json:"completed"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+func init() {
+	if err := godotenv.Load(); err != nil {
+		log.Fatal("Error al cargar el archivo .env", err)
+	}
+
+	var err error
+	pool, err = pgxpool.New(ctx, os.Getenv("PG_FROM_DB_URL"))
+	if err != nil {
+		log.Fatal("Unable to connect to database:", err)
+	}
+
+	if err := pool.Ping(ctx); err != nil {
+		log.Fatal("Unable to ping database:", err)
+	}
+
+	fmt.Println("Connected to PostgreSQL database!")
+}
+
+func main() {
+	app := &cli.App{
+		Name:     "Go Todo App",
+		Usage:    "A simple CLI program to manage your tasks",
+		Commands: []*cli.Command{
+			// We'll add commands here
+		},
+	}
+
+	err := app.Run(os.Args)
+	if err != nil {
+		log.Fatal(err)
+	}
 }