#!/usr/bin/env python3
"""
Functions for validating forms.
"""

async def validate_register(request, form):
	"""Validate data from the registration form."""
	username = form.get('username')
	email = form.get('email')
	password = form.get('password')
	password_verify = form.get('password_verify')

	async with request.app['pool'].acquire() as conn:
		users = await conn.fetch(
			"SELECT username, email FROM user_info "
			"WHERE username = $1 OR email = $2",
			username, email)

	errors = {'password': [], 'username': [], 'email': []}
	if password != password_verify:
		errors['password'].append("Passwords do not match.")
	if len(password) < 8 or len(password) > 10240:
		errors['password'].append(
			"Password must be between 8 and 10240 characters long.")
	if len(username) < 3 or len(username) > 20:
		errors['username'].append(
			"Username must be between 3 and 20 characters long.")
	if username in [user['username'] for user in users]:
		errors['username'].append("Username already in use.")
	if email in [user['email'] for user in users]:
		errors['email'].append("Email already in use.")
	
	return errors