#!/usr/bin/env python3
"""
Various different tools for Buckler.
"""
import email.mime.text
import smtplib
import secrets

import config


def send_mail(to_addr, subject, body):
	"""
	Sends an email.
	"""
	msg = email.mime.text.MIMEText(body, 'plain', 'utf8')
	msg['From'] = config.email['user']
	msg['To'] = to_addr
	msg['Subject'] = subject

	with smtplib.SMTP_SSL(config.email['host'],config.email['port']) as server:
		server.login(config.email['user'], config.email['password'])
		server.send_message(msg)


async def send_invite(request, to_addr):
	"""
	Sends an invitation.
	"""
	token = secrets.token_urlsafe(32)
	async with request.app['pool'].acquire() as conn:
		await conn.execute(
			"INSERT INTO invite (email, token) "
			"VALUES ($1, $2)",
			to_addr, token)
	d = {'invite': token}
	invite_url = request.app.router['register'].url_for().with_query(d)
	invite_url = 'https://' + config.server_domain + str(invite_url)
	body = "Buckle up.\n" + invite_url
	send_mail(to_addr, "Buckler Invite", body)


async def send_confirmation(request, user_id, to_addr):
	"""
	Sends an email confirmation.
	"""
	token = secrets.token_urlsafe(32)
	async with request.app['pool'].acquire() as conn:
		await conn.execute(
			"INSERT INTO email_confirmation (user_id, token) "
			"VALUES ($1, $2)",
			user_id, token)
	d = {'confirm': token}
	confirm_url = request.app.router['register'].url_for().with_query(d)
	confirm_url = 'https://' + config.server_domain + str(confirm_url)
	body = "Buckle up.\n" + confirm_url
	send_mail(to_addr, "Confirm Email", body)


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


def find_dict(lst, key, value):
	"""
	Returns the index of the dictionary in the given `lst` which
	has d[`key`] == `value`.
	"""
	for i, d in enumerate(lst):
		if d[key] == value:
			return i
	return -1