## $Id: payment.py 12696 2015-03-09 00:53:07Z uli $
##
## Copyright (C) 2011 Uli Fouquet & Henrik Bettermann
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
##
"""
These are the payment tickets.
"""
import decimal
import grok
import uuid
from datetime import datetime
from zope.component import getUtilitiesFor
from zope.event import notify
from waeup.ikoba.interfaces import MessageFactory as _
from waeup.ikoba.utils.helpers import attrs_to_fields
from waeup.ikoba.utils.logger import Logger
from waeup.ikoba.payments.interfaces import (
    IPayment, STATE_UNPAID, STATE_FAILED, STATE_PAID,
    IPaymentGatewayService, IPayer, IPaymentItem, IPayee,
    IPaymentGatewayServicesLister,
    )


def format_payment_item_values(payment_item_values, currency):
    """Format tuples (description, currency, amount) for output.

    `currency` passed in is the 'target' currency.

    Returns a list of formated values. Last item is total sum.
    XXX: we do not really respect currency. If different items
         have different currencies, we are choked.
    """
    result = []
    total = decimal.Decimal("0.00")
    for descr, item_currency, amount in payment_item_values:
        total += amount
        if item_currency != currency:
            raise ValueError(
                "Different currencies in payment items not supported.")
        result.append((descr, '%s %0.2f' % (item_currency, amount)))
    result.append((_('Total'), '%s %0.2f' % (currency, total)))
    return result


def get_payment_providers():
    """Get all payment providers registered.
    """
    return dict(
        getUtilitiesFor(IPaymentGatewayService)
    )


class PaymentGatewayServicesLister(grok.GlobalUtility):
    grok.implements(IPaymentGatewayServicesLister)

    def __call__(self):
        """Get all services of payment gateways registered.
        """
        return get_payment_providers()


class PaymentProviderServiceBase(grok.GlobalUtility):

    grok.baseclass()
    grok.implements(IPaymentGatewayService)

    title = u'Sample Credit Card Service'


@attrs_to_fields
class Payment(grok.Container, Logger):
    """This is a payment.
    """
    grok.implements(IPayment)
    grok.provides(IPayment)

    logger_name = 'waeup.ikoba.${sitename}.payments'
    logger_filename = 'payments.log'
    logger_format_str = '"%(asctime)s","%(user)s",%(message)s'

    @property
    def amount(self):
        """The amount of a payment.

        Equals the sum of items contained.
        """
        return sum(
            [item.amount for item in self.values()],
            decimal.Decimal("0.00")  # default value
        )

    def __init__(self):
        super(Payment, self).__init__()
        self.creation_date = datetime.utcnow()
        self.payment_date = None
        self.payment_id = u'PAY_' + unicode(uuid.uuid4().hex)
        self.state = STATE_UNPAID
        return

    def approve(self, payment_date=None):
        """A payment was approved.

        Successful ending; the payment is marked as payed.

        If `payment_date` is given, it must be a datetime object
        giving a datetime in UTC timezone.

        Raises ObjectModifiedEvent.
        """
        if payment_date is None:
            payment_date = datetime.utcnow()
        self.payment_date = payment_date
        self.state = STATE_PAID
        notify(grok.ObjectModifiedEvent(self))

    def mark_failed(self, reason=None):
        """Mark payment as failed.

        Raises ObjectModifiedEvent.
        """
        self.state = STATE_FAILED
        notify(grok.ObjectModifiedEvent(self))

    def add_payment_item(self, item):
        """Add `item`

        Returns the key under which the `item` was stored. Please do
        not make anby assumptions about the key. It will be a
        string. That is all we can tell.

        """
        cnt = 0
        while str(cnt) in self:
            cnt += 1
        self[str(cnt)] = item
        return str(cnt)


@attrs_to_fields
class Payer(object):
    """A Payment is for testing.

    It cannot be stored in ZODB.
    """
    grok.implements(IPayer)


@attrs_to_fields
class PaymentItem(grok.Model):

    grok.implements(IPaymentItem)

    def __init__(self):
        super(PaymentItem, self).__init__()


@attrs_to_fields
class Payee(object):
    """Someone being paid.

    This is for testing only and cannot be stored in ZODB.
    """
    grok.implements(IPayee)