ADD: added database connection for players data handling and started login funtion with database

backend/internal/database/initTables.go

@@ -5,28 +5,66 @@ import (
 	"fmt"
 	"log"
 
+	"volleyball/internal/player"
+
 	_ "github.com/lib/pq" // Import the PostgreSQL driver
 )
 
-const playerTable = `
-	CREATE TABLE IF NOT EXISTS players (
+const teamTable = `
+	CREATE TABLE IF NOT EXISTS teams (
 		id SERIAL PRIMARY KEY,
-		name VARCHAR(100) NOT NULL,
-		age INT NOT NULL,
-		birthday DATE NOT NULL
+		player1_id uuid NOT NULL,	
+		player2_id uuid NOT NULL,
+		formation_date DATE NOT NULL DEFAULT CURRENT_DATE,
+		FOREIGN KEY (player1_id) REFERENCES players(id),
+		FOREIGN KEY (player2_id) REFERENCES players(id)
 	);
 `
 
-func InitTables(db *sql.DB) {
+var tableNames = []string{
+	"players",
+	"teams",
+}
+
+func CheckIfTablesExist(db *sql.DB) (bool, error) {
+	for _, tableName := range tableNames {
+		exists, err := tableExists(db, tableName)
+		if err != nil {
+			return false, fmt.Errorf("error checking if table %s exists: %w", tableName, err)
+		}
+		if !exists {
+			return false, nil // At least one table does not exist
+		}
+	}
+	return true, nil // All tables exist
+}
+
+func tableExists(db *sql.DB, tableName string) (bool, error) {
+	query := `
+		SELECT EXISTS (
+			SELECT FROM information_schema.tables 
+			WHERE table_schema = 'public' AND table_name = $1
+		);
+	`
+	var exists bool
+	err := db.QueryRow(query, tableName).Scan(&exists)
+	return exists, err
+}
+
+func InitTables(d *sql.DB) error {
 	tables := []string{
-		playerTable,
+		player.PlayerTable,
+		player.RoleTable,
+		teamTable,
 	}
 
 	for _, table := range tables {
-		if _, err := db.Exec(table); err != nil {
+		if _, err := d.Exec(table); err != nil {
 			log.Fatalf("Error creating table: %v", err)
+			return fmt.Errorf("error creating table: %w", err)
 		}
 	}
 
-	fmt.Println("Tables initialized successfully.")
+	log.Println("Tables initialized successfully.")
+	return nil
 }