# -*- coding: utf-8 -*-
# Copyright 2016-2017 LasLabs Inc.
# License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl.html).

import logging
import urllib
from openerp import _, api, fields, models
from openerp.exceptions import ValidationError

_logger = logging.getLogger(__name__)
try:
    import pyotp
except ImportError:
    _logger.debug(
        'Could not import PyOTP. Please make sure this library is available in'
        ' your environment.'
    )


class ResUsersAuthenticatorCreate(models.TransientModel):
    _name = 'res.users.authenticator.create'
    _description = 'MFA App/Device Creation Wizard'

    name = fields.Char(
        string='Authentication App/Device Name',
        help='A name that will help you remember this authentication'
             ' app/device',
        required=True,
        index=True,
    )
    secret_key = fields.Char(
        default=lambda s: pyotp.random_base32(),
        required=True,
    )
    qr_code_tag = fields.Html(
        compute='_compute_qr_code_tag',
        string='QR Code',
        help='Scan this image with your authentication app to add your'
             ' account',
    )
    user_id = fields.Many2one(
        comodel_name='res.users',
        default=lambda s: s._default_user_id(),
        required=True,
        string='Associated User',
        help='This is the user whose account the new authentication app/device'
             ' will be tied to',
        readonly=True,
        index=True,
        ondelete='cascade',
    )
    confirmation_code = fields.Char(
        string='Confirmation Code',
        help='Enter the latest six digit code generated by your authentication'
             ' app',
        required=True,
    )

    @api.model
    def _default_user_id(self):
        user_id = self.env.context.get('uid')
        return self.env['res.users'].browse(user_id)

    @api.multi
    @api.depends(
        'secret_key',
        'user_id.display_name',
        'user_id.company_id.display_name',
    )
    def _compute_qr_code_tag(self):
        for record in self:
            if not record.user_id:
                continue

            totp = pyotp.TOTP(record.secret_key)
            provisioning_uri = totp.provisioning_uri(
                record.user_id.display_name.encode('utf-8'),
                issuer_name=record.user_id.company_id.display_name,
            )
            provisioning_uri = urllib.quote(provisioning_uri)

            qr_width = qr_height = 300
            tag_base = '<img src="/report/barcode/?type=QR&amp;'
            tag_params = 'value=%s&amp;width=%s&amp;height=%s">' % (
                provisioning_uri,
                qr_width,
                qr_height
            )
            record.qr_code_tag = tag_base + tag_params

    @api.multi
    def action_create(self):
        self.ensure_one()
        self._perform_validations()
        self._create_authenticator()

        action_data = self.env.ref('base.action_res_users_my').read()[0]
        action_data.update({'res_id': self.user_id.id})
        return action_data

    @api.multi
    def _perform_validations(self):
        totp = pyotp.TOTP(self.secret_key)
        if not totp.verify(self.confirmation_code):
            raise ValidationError(_(
                'Your confirmation code is not correct. Please try again,'
                ' making sure that your MFA device is set to the correct time'
                ' and that you have entered the most recent code generated by'
                ' your authentication app.'
            ))

    @api.multi
    def _create_authenticator(self):
        self.env['res.users.authenticator'].create({
            'name': self.name,
            'secret_key': self.secret_key,
            'user_id': self.user_id.id,
        })