from flask import (
    render_template,
    redirect,
    session,
    url_for,
    current_app
)

from flask_login import (
    current_user,
    login_required
)
from notifications_python_client.errors import HTTPError
from werkzeug.exceptions import abort

from app.main import main
from app.main.forms import ServiceNameForm
from app.notify_client.models import InvitedUser

from app import (
    invite_api_client,
    user_api_client,
    service_api_client
)

from app.utils import (
    email_safe,
    is_gov_user
)


def _add_invited_user_to_service(invited_user):
    invitation = InvitedUser(**invited_user)
    # if invited user add to service and redirect to dashboard
    user = user_api_client.get_user(session['user_id'])
    service_id = invited_user['service']
    user_api_client.add_user_to_service(service_id, user.id, invitation.permissions)
    invite_api_client.accept_invite(service_id, invitation.id)
    return service_id


def _create_service(service_name, email_from, form):
    try:
        service_id = service_api_client.create_service(service_name=service_name,
                                                       message_limit=current_app.config['DEFAULT_SERVICE_LIMIT'],
                                                       restricted=True,
                                                       user_id=session['user_id'],
                                                       email_from=email_from)
        session['service_id'] = service_id
        return service_id, None
    except HTTPError as e:
        if e.status_code == 400 and e.message['name']:
            form.name.errors.append("This service name is already in use")
            return None, e
        else:
            raise e


def _create_example_template(service_id):
    example_sms_template = service_api_client.create_service_template(
        'Example text message template',
        'sms',
        'Hey ((name)), I’m trying out Notify. Today is ((day of week)) and my favourite colour is ((colour)).',
        service_id,
        process_type='priority',
    )
    return example_sms_template


@main.route("/add-service", methods=['GET', 'POST'])
@login_required
def add_service():
    invited_user = session.get('invited_user')
    if invited_user:
        service_id = _add_invited_user_to_service(invited_user)
        return redirect(url_for('main.service_dashboard', service_id=service_id))

    if not is_gov_user(current_user.email_address):
        abort(403)

    form = ServiceNameForm()
    heading = 'Which service do you want to set up notifications for?'

    if form.validate_on_submit():
        email_from = email_safe(form.name.data)
        service_name = form.name.data

        service_id, error = _create_service(service_name, email_from, form)
        if error:
            return render_template('views/add-service.html', form=form, heading=heading)
        if len(service_api_client.get_active_services({'user_id': session['user_id']}).get('data', [])) > 1:
            return redirect(url_for('main.service_dashboard', service_id=service_id))

        example_sms_template = _create_example_template(service_id)

        return redirect(url_for(
            'main.start_tour',
            service_id=service_id,
            template_id=example_sms_template['data']['id'],
        ))
    else:
        return render_template(
            'views/add-service.html',
            form=form,
            heading=heading
        )