#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
SàT website: Salut à Toi's presentation website
Copyright (C) 2012  Jérôme Poisson (goffi@goffi.org)

This file is part of SàT website.

SàT website is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Foobar 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 Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with Foobar.  If not, see <http://www.gnu.org/licenses/>.
"""

from django.utils.translation import ugettext_lazy as _, string_concat, get_language
from django.utils.html import format_html
from django.core.mail import send_mail
from django import forms
from django.conf import settings
from collections import OrderedDict
from email import email
import utils


## Fields ##


class Section(forms.Field):
    def __init__(self, *args, **kwargs):
        kwargs['required'] = False
        super(Section, self).__init__(*args, **kwargs)

class BooleanField(forms.BooleanField):
    def __init__(self, *args, **kwargs):
        super(BooleanField, self).__init__(*args, **kwargs)

class CharField(forms.CharField):
    def __init__(self, label=None, *args, **kwargs):
        try:
            placeholder = kwargs.pop('placeholder')
        except KeyError:
            placeholder = label

        super(CharField, self).__init__(*args, **kwargs)
        self.widget.attrs.update({'class': "form-control",
                                  'placeholder': placeholder})

class EmailField(forms.EmailField):
    def __init__(self, *args, **kwargs):
        super(EmailField, self).__init__(*args, **kwargs)
        self.widget.attrs.update({'class': "form-control",
                                  'placeholder': self.label})

class ChoiceField(forms.ChoiceField):
    def __init__(self, *args, **kwargs):
        super(ChoiceField, self).__init__(*args, **kwargs)
        self.widget.attrs.update({'class': "form-control"})

    def choice_label(self, value):
        """Return the label corresponding to the given value.
    
        @param value (unicode): a choice value
        @return: unicode
        """
        for current_value, label in self.choices:
            if unicode(current_value) == unicode(value):
                return unicode(label)
        return u''

        
## Forms ##


class RegistrationForm(forms.Form):

    section_1 = Section(label=_(u'Identity'))
    name = CharField(label=_(u'Name'))
    surname = CharField(label=_(u'Surname'))
    address = CharField(label=_(u'Address, postal code, municipality'))

    section_2 = Section(label=_(u'Contacts'))
    email = EmailField(label=_(u'Email address'))
    email_confirmation = EmailField(label=_(u'Email address confirmation'))
    jid = EmailField(required=False, label=_(u'Jabber ID (for example your SàT login)'))

    section_3 = Section(label=_(u'Subscription'))
    subscription_amount = ChoiceField(choices=[(amount, u"%s €" % amount) for amount in utils.get_asso_subscr_amounts()])

    section_3b = Section(label="")
    payment_method = ChoiceField(choices=[(u"card", _(u"Credit or debit card")), (u"transfer", _(u"Bank transfer"))],
                               help_text=_(u'Choose "Credit or debit card" to pay via CB, Visa or Mastercard using a secure banking service. Choose "Bank transfer" to proceed manually with the association\'s IBAN/BIC numbers. For both methods, we will first send you an email containing all the details.'), widget=forms.RadioSelect)

    section_5 = Section(label=_(u'Reference'))
    ref = CharField(required=False, label=_(u"Reference"), placeholder=_(u"Adherent number in case of a renewal"))

    section_6 = Section(label=_(u'Comment'))
    comment = CharField(required=False, label=_(u"Comment"), placeholder="", widget=forms.Textarea(attrs={'rows': 3}))

    def html_link(url, label):
        return string_concat('<a target="#" href="', url, '">', label, '</a>')

    agreement_label = [_(u"I read the "),
                       html_link(settings.ASSO_URL_STATUTES, _(u"Statutes")),
                       _(u" and "),
                       html_link(settings.ASSO_URL_RULES, _(u"Rules")),
                       _(u" of the association, and agree to both of them."),
                       ]
    agreement_confirmation = BooleanField(label=string_concat(*agreement_label))

    def sections(self):
        """Get the fields grouped in sections.
        
        @return: OrderedDict binding section name to a list of fields
        """ 
        sections = OrderedDict()
        current_section = None
        for field in self:
            if isinstance(field.field, Section):
                current_section = sections.setdefault(field.label, [])
            else:
                current_section.append(field)
        return sections


    def results(self, user_readable=True):
        """Get the results submitted by the user as a list of couple. Keep the
        pertinent fields and filter out the inappropriate ones.
    
        @param user_readable: set to True to prefer the field labels to their names
        @return: list of couple (name, value) or (label, value)
        """
        if not self.is_valid():
            return ''
        results = []
        for field in self:
            if isinstance(field.field, Section):
                continue
            if field.name in ('email_confirmation', 'agreement_confirmation') or not field.value():
                continue
            if field.name == "payment_method" and self['subscription_amount'].value() == "0":
                continue
            value = field.value()
            if user_readable:
                if isinstance(field.field, ChoiceField):
                    value = field.field.choice_label(value)
                results.append((field.label, value))
            else:
                results.append((field.name, value))
        if user_readable:
            results.append((_(u'Language'), utils.get_language_name_local(get_language())))
        else:
            results.append(('lang', get_language()))
        return results

    def result_as_string(self, user_readable=True):
        """Get the result as a string to be sent for example via email.

        @param user_readable: set to True to prefer the field labels to their names
        @return: list of couple (name, value) or (label, value)
        """
        return '\n'.join([name + ': ' + value for name, value in self.results(user_readable)])
        
    def process_submitted_data(self):
        if not self.is_valid():
            return
        # send email to user
        send_mail(_(u'Inscription à Salut à Toi'), self.result_as_string(True), settings.EMAIL_BACKEND, [self['email'].value()], fail_silently=False)
        # send email to admins
        send_mail(_(u'Inscription à Salut à Toi'), self.result_as_string(False), settings.EMAIL_BACKEND, [email for name, email in settings.ADMINS], fail_silently=False)