from datetime import datetime, timedelta

from flask import (
    render_template,
    redirect,
    session,
    abort,
    url_for,
    flash
)

from flask.ext.login import current_user

from client.errors import HTTPError

from app.main import main
from app.main.dao import users_dao
from app.main.forms import RegisterUserForm

from app import user_api_client


@main.route('/register', methods=['GET', 'POST'])
def register():
    if current_user and current_user.is_authenticated():
        return redirect(url_for('main.choose_service'))

    form = RegisterUserForm()

    if form.validate_on_submit():
        if users_dao.is_email_unique(form.email_address.data):
            try:
                user = user_api_client.register_user(form.name.data,
                                                     form.email_address.data,
                                                     form.mobile_number.data,
                                                     form.password.data)
            except HTTPError as e:
                if e.status_code == 404:
                    abort(404)
                else:
                    raise e

            # TODO possibly there should be some exception handling
            # for sending sms and email codes.
            # How do we report to the user there is a problem with
            # sending codes apart from service unavailable?
            # at the moment i believe http 500 is fine.
            users_dao.send_verify_code(user.id, 'sms')
            users_dao.send_verify_code(user.id, 'email')
            session['expiry_date'] = str(datetime.now() + timedelta(hours=1))
            session['user_details'] = {"email": user.email_address, "id": user.id}
            return redirect(url_for('main.verify'))
        else:
            flash('There was an error registering your account')

    return render_template('views/register.html', form=form)