# coding: utf-8
# Part of Odoo. See LICENSE file for full copyright and licensing details.
import json
import logging
import pprint
import random
import requests
import string
from werkzeug.exceptions import Forbidden

from odoo import fields, models, api, _
from odoo.exceptions import ValidationError

_logger = logging.getLogger(__name__)

class PosPaymentMethod(models.Model):
    _inherit = 'pos.payment.method'

    def _get_payment_terminal_selection(self):
        return super(PosPaymentMethod, self)._get_payment_terminal_selection() + [('odoo_adyen', 'Odoo Payments by Adyen'), ('adyen', 'Adyen')]

    # Adyen
    adyen_api_key = fields.Char(string="Adyen API key", help='Used when connecting to Adyen: https://docs.adyen.com/user-management/how-to-get-the-api-key/#description', copy=False)
    adyen_terminal_identifier = fields.Char(help='[Terminal model]-[Serial number], for example: P400Plus-123456789', copy=False)
    adyen_test_mode = fields.Boolean(help='Run transactions in the test environment.')

    # Odoo Payments by Adyen
    adyen_account_id = fields.Many2one('adyen.account', related='company_id.adyen_account_id')
    adyen_payout_id = fields.Many2one('adyen.payout', string='Adyen Payout', domain="[('adyen_account_id', '=', adyen_account_id)]")
    adyen_terminal_id = fields.Many2one('adyen.terminal', string='Adyen Terminal', domain="[('adyen_account_id', '=', adyen_account_id)]")

    adyen_latest_response = fields.Char(help='Technical field used to buffer the latest asynchronous notification from Adyen.', copy=False, groups='base.group_erp_manager')
    adyen_latest_diagnosis = fields.Char(help='Technical field used to determine if the terminal is still connected.', copy=False, groups='base.group_erp_manager')

    @api.constrains('adyen_terminal_identifier')
    def _check_adyen_terminal_identifier(self):
        for payment_method in self:
            if not payment_method.adyen_terminal_identifier:
                continue
            existing_payment_method = self.search([('id', '!=', payment_method.id),
                                                   ('adyen_terminal_identifier', '=', payment_method.adyen_terminal_identifier)],
                                                  limit=1)
            if existing_payment_method:
                raise ValidationError(_('Terminal %s is already used on payment method %s.')
                                      % (payment_method.adyen_terminal_identifier, existing_payment_method.display_name))

    def _get_adyen_endpoints(self):
        return {
            'terminal_request': 'https://terminal-api-%s.adyen.com/async',
        }

    @api.onchange('adyen_terminal_id')
    def onchange_use_payment_terminal(self):
        for payment_method in self:
            if payment_method.use_payment_terminal == 'odoo_adyen' and payment_method.adyen_terminal_id:
                payment_method.adyen_terminal_identifier = payment_method.adyen_terminal_id.terminal_uuid

    def _is_write_forbidden(self, fields):
        whitelisted_fields = set(('adyen_latest_response', 'adyen_latest_diagnosis'))
        return super(PosPaymentMethod, self)._is_write_forbidden(fields - whitelisted_fields)

    def _adyen_diagnosis_request_data(self, pos_config_name):
        service_id = ''.join(random.choices(string.ascii_letters + string.digits, k=10))
        return {
            "SaleToPOIRequest": {
                "MessageHeader": {
                    "ProtocolVersion": "3.0",
                    "MessageClass": "Service",
                    "MessageCategory": "Diagnosis",
                    "MessageType": "Request",
                    "ServiceID": service_id,
                    "SaleID": pos_config_name,
                    "POIID": self.adyen_terminal_identifier,
                },
                "DiagnosisRequest": {
                    "HostDiagnosisFlag": False
                }
            }
        }

    def get_latest_adyen_status(self, pos_config_name):
        self.ensure_one()

        # Poll the status of the terminal if there's no new
        # notification we received. This is done so we can quickly
        # notify the user if the terminal is no longer reachable due
        # to connectivity issues.
        self.proxy_adyen_request(self._adyen_diagnosis_request_data(pos_config_name))

        latest_response = self.sudo().adyen_latest_response
        latest_response = json.loads(latest_response) if latest_response else False
        self.sudo().adyen_latest_response = ''  # avoid handling old responses multiple times

        return {
            'latest_response': latest_response,
            'last_received_diagnosis_id': self.sudo().adyen_latest_diagnosis,
        }

    def proxy_adyen_request(self, data, operation=False):
        ''' Necessary because Adyen's endpoints don't have CORS enabled '''
        if not operation:
            operation = 'terminal_request'

        if self.use_payment_terminal == 'odoo_adyen':
            return self._proxy_adyen_request_odoo_proxy(data, operation)
        else:
            return self._proxy_adyen_request_direct(data, operation)

    def _proxy_adyen_request_direct(self, data, operation):
        self.ensure_one()
        TIMEOUT = 10

        _logger.info('request to adyen\n%s', pprint.pformat(data))

        environment = 'test' if self.adyen_test_mode else 'live'
        endpoint = self._get_adyen_endpoints()[operation] % environment
        headers = {
            'x-api-key': self.adyen_api_key,
        }
        req = requests.post(endpoint, json=data, headers=headers, timeout=TIMEOUT)

        # Authentication error doesn't return JSON
        if req.status_code == 401:
            return {
                'error': {
                    'status_code': req.status_code,
                    'message': req.text
                }
            }

        if req.text == 'ok':
            return True

        return req.json()

    def _proxy_adyen_request_odoo_proxy(self, data, operation):
        try:
            return self.env.company.sudo().adyen_account_id._adyen_rpc(operation, {
                'request_data': data,
                'account_code': self.sudo().adyen_payout_id.code,
                'notification_url': self.env['ir.config_parameter'].sudo().get_param('web.base.url'),
            })
        except Forbidden:
            return {
                'error': {
                    'status_code': 401,
                }
            }