check exists email or phone

routes.py

@@ -4,6 +4,7 @@ from app import app, db, bcrypt, login_manager
 from models import User, Listing, Booking, Image, Document, Amenities
 from datetime import datetime
 from utils import generate_password, send_email, save_document
+import re
 
 @login_manager.user_loader
 def load_user(user_id):
@@ -43,15 +44,28 @@ def logout():
 def register():
     if request.method == 'POST':
         email = request.form['email']
+        phone = request.form['phone']
+
+        existing_user = User.query.filter((User.email == email) | (User.phone == phone)).first()
+        if existing_user:
+            error_message = "User with this email or phone number already exists."
+            return render_template('register.html', error=error_message)
+
+        phone_pattern = re.compile(r'^(\+\d{1,3}|8)?\d{10,15}$')
+        if not phone_pattern.match(phone):
+            error_message = "Invalid phone number format."
+            return render_template('register.html', error=error_message)
+
         password_plain = generate_password()
         password = bcrypt.generate_password_hash(password_plain).decode('utf-8')
-        phone = request.form['phone']
         user = User(email=email, password=password, phone=phone)
         db.session.add(user)
         db.session.commit()
+
         send_email(email, 'Your Account Password', f'Your password is: {password_plain}')
         login_user(user)
         return redirect(url_for('upload_document'))
+
     return render_template('register.html')
 
 @app.route('/upload-document', methods=['GET', 'POST'])