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from urlparse import urljoin

from datetime import datetime

from django import forms

from django.utils.translation import ugettext as _

from django.contrib.auth.forms import UserCreationForm, AuthenticationForm, \

    PasswordResetForm, PasswordChangeForm, SetPasswordForm

from django.core.mail import send_mail

from django.contrib.auth.tokens import default_token_generator

from django.template import Context, loader

from django.utils.http import int_to_base36

from django.core.urlresolvers import reverse

from django.utils.functional import lazy

from django.utils.safestring import mark_safe

from django.contrib import messages

from django.utils.encoding import smart_str

from django.forms.models import fields_for_model

from astakos.im.models import (

    AstakosUser, Invitation, get_latest_terms,

    EmailChange, PendingThirdPartyUser

)

from astakos.im.settings import (INVITATIONS_PER_LEVEL, DEFAULT_FROM_EMAIL,

    BASEURL, SITENAME, RECAPTCHA_PRIVATE_KEY, DEFAULT_CONTACT_EMAIL,

    RECAPTCHA_ENABLED, LOGGING_LEVEL, PASSWORD_RESET_EMAIL_SUBJECT,

    NEWPASSWD_INVALIDATE_TOKEN

)

from astakos.im.widgets import DummyWidget, RecaptchaWidget

from astakos.im.functions import send_change_email

# since Django 1.4 use django.core.urlresolvers.reverse_lazy instead

from astakos.im.util import reverse_lazy, reserved_email, get_query

import logging

import hashlib

import recaptcha.client.captcha as captcha

from random import random

logger = logging.getLogger(__name__)

class LocalUserCreationForm(UserCreationForm):

    """

    Extends the built in UserCreationForm in several ways:

    * Adds email, first_name, last_name, recaptcha_challenge_field, recaptcha_response_field field.

    * The username field isn't visible and it is assigned a generated id.

    * User created is not active.

    """

    recaptcha_challenge_field = forms.CharField(widget=DummyWidget)

    recaptcha_response_field = forms.CharField(widget=RecaptchaWidget, label='')

    class Meta:

        model = AstakosUser

        fields = ("email", "first_name", "last_name", "has_signed_terms", "has_signed_terms")

    def __init__(self, *args, **kwargs):

        """

        Changes the order of fields, and removes the username field.

        """

        request = kwargs.pop('request', None)

        if request:

            self.ip = request.META.get('REMOTE_ADDR',

                                       request.META.get('HTTP_X_REAL_IP', None))

        super(LocalUserCreationForm, self).__init__(*args, **kwargs)

        self.fields.keyOrder = ['email', 'first_name', 'last_name',

                                'password1', 'password2']

        if RECAPTCHA_ENABLED:

            self.fields.keyOrder.extend(['recaptcha_challenge_field',

                                         'recaptcha_response_field',])

        if get_latest_terms():

            self.fields.keyOrder.append('has_signed_terms')

        if 'has_signed_terms' in self.fields:

            # Overriding field label since we need to apply a link

            # to the terms within the label

            terms_link_html = '<a href="%s" target="_blank">%s</a>' \

                    % (reverse('latest_terms'), _("the terms"))

            self.fields['has_signed_terms'].label = \

                    mark_safe("I agree with %s" % terms_link_html)

    def clean_email(self):

        email = self.cleaned_data['email']

        if not email:

            raise forms.ValidationError(_("This field is required"))

        if reserved_email(email):

            raise forms.ValidationError(_("This email is already used"))

        return email

    def clean_has_signed_terms(self):

        has_signed_terms = self.cleaned_data['has_signed_terms']

        if not has_signed_terms:

            raise forms.ValidationError(_('You have to agree with the terms'))

        return has_signed_terms

    def clean_recaptcha_response_field(self):

        if 'recaptcha_challenge_field' in self.cleaned_data:

            self.validate_captcha()

        return self.cleaned_data['recaptcha_response_field']

    def clean_recaptcha_challenge_field(self):

        if 'recaptcha_response_field' in self.cleaned_data:

            self.validate_captcha()

        return self.cleaned_data['recaptcha_challenge_field']

    def validate_captcha(self):

        rcf = self.cleaned_data['recaptcha_challenge_field']

        rrf = self.cleaned_data['recaptcha_response_field']

        check = captcha.submit(rcf, rrf, RECAPTCHA_PRIVATE_KEY, self.ip)

        if not check.is_valid:

            raise forms.ValidationError(_('You have not entered the correct words'))

    def save(self, commit=True):

        """

        Saves the email, first_name and last_name properties, after the normal

        save behavior is complete.

        """

        user = super(LocalUserCreationForm, self).save(commit=False)

        if commit:

            user.save()

            logger._log(LOGGING_LEVEL, 'Created user %s' % user.email, [])

        return user

class InvitedLocalUserCreationForm(LocalUserCreationForm):

    """

    Extends the LocalUserCreationForm: email is readonly.

    """

    class Meta:

        model = AstakosUser

        fields = ("email", "first_name", "last_name", "has_signed_terms")

    def __init__(self, *args, **kwargs):

        """

        Changes the order of fields, and removes the username field.

        """

        super(InvitedLocalUserCreationForm, self).__init__(*args, **kwargs)

        #set readonly form fields

        ro = ('email', 'username',)

        for f in ro:

            self.fields[f].widget.attrs['readonly'] = True

    def save(self, commit=True):

        user = super(InvitedLocalUserCreationForm, self).save(commit=False)

        level = user.invitation.inviter.level + 1

        user.level = level

        user.invitations = INVITATIONS_PER_LEVEL.get(level, 0)

        user.email_verified = True

        if commit:

            user.save()

        return user

class ThirdPartyUserCreationForm(forms.ModelForm):

    id = forms.CharField(

        widget=forms.HiddenInput(),

        label='',

        required=False

    )

    third_party_identifier = forms.CharField(

        widget=forms.HiddenInput(),

        label=''

    )

    class Meta:

        model = AstakosUser

        fields = ['id', 'email', 'third_party_identifier', 'first_name', 'last_name']

    def __init__(self, *args, **kwargs):

        """

        Changes the order of fields, and removes the username field.

        """

        self.request = kwargs.get('request', None)

        if self.request:

            kwargs.pop('request')

        latest_terms = get_latest_terms()

        if latest_terms:

            self._meta.fields.append('has_signed_terms')

        super(ThirdPartyUserCreationForm, self).__init__(*args, **kwargs)

        if latest_terms:

            self.fields.keyOrder.append('has_signed_terms')

        if 'has_signed_terms' in self.fields:

            # Overriding field label since we need to apply a link

            # to the terms within the label

            terms_link_html = '<a href="%s" target="_blank">%s</a>' \

                    % (reverse('latest_terms'), _("the terms"))

            self.fields['has_signed_terms'].label = \

                    mark_safe("I agree with %s" % terms_link_html)

    def clean_email(self):

        email = self.cleaned_data['email']

        if not email:

            raise forms.ValidationError(_("This field is required"))

        return email

    def clean_has_signed_terms(self):

        has_signed_terms = self.cleaned_data['has_signed_terms']

        if not has_signed_terms:

            raise forms.ValidationError(_('You have to agree with the terms'))

        return has_signed_terms

    def save(self, commit=True):

        user = super(ThirdPartyUserCreationForm, self).save(commit=False)

        user.set_unusable_password()

        user.provider = get_query(self.request).get('provider')

        if commit:

            user.save()

            logger._log(LOGGING_LEVEL, 'Created user %s' % user.email, [])

        return user

class InvitedThirdPartyUserCreationForm(ThirdPartyUserCreationForm):

    """

    Extends the ThirdPartyUserCreationForm: email is readonly.

    """

    def __init__(self, *args, **kwargs):

        """

        Changes the order of fields, and removes the username field.

        """

        super(InvitedThirdPartyUserCreationForm, self).__init__(*args, **kwargs)

        #set readonly form fields

        ro = ('email',)

        for f in ro:

            self.fields[f].widget.attrs['readonly'] = True

    def save(self, commit=True):

        user = super(InvitedThirdPartyUserCreationForm, self).save(commit=False)

        level = user.invitation.inviter.level + 1

        user.level = level

        user.invitations = INVITATIONS_PER_LEVEL.get(level, 0)

        user.email_verified = True

        if commit:

            user.save()

        return user

class ShibbolethUserCreationForm(ThirdPartyUserCreationForm):

    additional_email = forms.CharField(widget=forms.HiddenInput(), label='', required = False)

    def __init__(self, *args, **kwargs):

        super(ShibbolethUserCreationForm, self).__init__(*args, **kwargs)

        # copy email value to additional_mail in case user will change it

        name = 'email'

        field = self.fields[name]

        self.initial['additional_email'] = self.initial.get(name, field.initial)

        self.initial['email'] = None

    def clean_email(self):

        email = self.cleaned_data['email']

        if self.instance:

            if self.instance.email == email:

                raise forms.ValidationError(_("This is your current email."))

        for user in AstakosUser.objects.filter(email=email):

            if user.provider == 'shibboleth':

                raise forms.ValidationError(_(

                        "This email is already associated with another \

                         shibboleth account."

                    )

                )

            else:

                raise forms.ValidationError(_("This email is already used"))

        super(ShibbolethUserCreationForm, self).clean_email()

        return email

    def save(self, commit=True):

        user = super(ShibbolethUserCreationForm, self).save(commit=False)

        try:

            p = PendingThirdPartyUser.objects.get(

                provider=user.provider,

                third_party_identifier=user.third_party_identifier

            )

        except:

            pass

        else:

            p.delete()

        return user

class InvitedShibbolethUserCreationForm(ShibbolethUserCreationForm, InvitedThirdPartyUserCreationForm):

    pass

class LoginForm(AuthenticationForm):

    username = forms.EmailField(label=_("Email"))

    recaptcha_challenge_field = forms.CharField(widget=DummyWidget)

    recaptcha_response_field = forms.CharField(widget=RecaptchaWidget, label='')

    def __init__(self, *args, **kwargs):

        was_limited = kwargs.get('was_limited', False)

        request = kwargs.get('request', None)

        if request:

            self.ip = request.META.get('REMOTE_ADDR',

                                       request.META.get('HTTP_X_REAL_IP', None))

        t = ('request', 'was_limited')

        for elem in t:

            if elem in kwargs.keys():

                kwargs.pop(elem)

        super(LoginForm, self).__init__(*args, **kwargs)

        self.fields.keyOrder = ['username', 'password']

        if was_limited and RECAPTCHA_ENABLED:

            self.fields.keyOrder.extend(['recaptcha_challenge_field',

                                         'recaptcha_response_field',])

    def clean_recaptcha_response_field(self):

        if 'recaptcha_challenge_field' in self.cleaned_data:

            self.validate_captcha()

        return self.cleaned_data['recaptcha_response_field']

    def clean_recaptcha_challenge_field(self):

        if 'recaptcha_response_field' in self.cleaned_data:

            self.validate_captcha()

        return self.cleaned_data['recaptcha_challenge_field']

    def validate_captcha(self):

        rcf = self.cleaned_data['recaptcha_challenge_field']

        rrf = self.cleaned_data['recaptcha_response_field']

        check = captcha.submit(rcf, rrf, RECAPTCHA_PRIVATE_KEY, self.ip)

        if not check.is_valid:

            raise forms.ValidationError(_('You have not entered the correct words'))

    def clean(self):

        """

        Override default behavior in order to check user's activation later

        """

        try:

            super(LoginForm, self).clean()

        except forms.ValidationError, e:

            if self.user_cache is None:

                raise

            if self.request:

                if not self.request.session.test_cookie_worked():

                    raise

        return self.cleaned_data

class ProfileForm(forms.ModelForm):

    """

    Subclass of ``ModelForm`` for permiting user to edit his/her profile.

    Most of the fields are readonly since the user is not allowed to change them.

    The class defines a save method which sets ``is_verified`` to True so as the user

    during the next login will not to be redirected to profile page.

    """

    renew = forms.BooleanField(label='Renew token', required=False)

    class Meta:

        model = AstakosUser

        fields = ('email', 'first_name', 'last_name', 'auth_token', 'auth_token_expires')

    def __init__(self, *args, **kwargs):

        self.session_key = kwargs.pop('session_key', None)

        super(ProfileForm, self).__init__(*args, **kwargs)

        instance = getattr(self, 'instance', None)

        ro_fields = ('email', 'auth_token', 'auth_token_expires')

        if instance and instance.id:

            for field in ro_fields:

                self.fields[field].widget.attrs['readonly'] = True

    def save(self, commit=True):

        user = super(ProfileForm, self).save(commit=False)

        user.is_verified = True

        if self.cleaned_data.get('renew'):

            user.renew_token(

                flush_sessions=True,

                current_key=self.session_key

            )

        if commit:

            user.save()

        return user

class FeedbackForm(forms.Form):

    """

    Form for writing feedback.

    """

    feedback_msg = forms.CharField(widget=forms.Textarea, label=u'Message')

    feedback_data = forms.CharField(widget=forms.HiddenInput(), label='',

                                    required=False)

class SendInvitationForm(forms.Form):

    """

    Form for sending an invitations

    """

    email = forms.EmailField(required = True, label = 'Email address')

    first_name = forms.EmailField(label = 'First name')

    last_name = forms.EmailField(label = 'Last name')

class ExtendedPasswordResetForm(PasswordResetForm):

    """

    Extends PasswordResetForm by overriding save method:

    passes a custom from_email in send_mail.

    Since Django 1.3 this is useless since ``django.contrib.auth.views.reset_password``

    accepts a from_email argument.

    """

    def clean_email(self):

        email = super(ExtendedPasswordResetForm, self).clean_email()

        try:

            user = AstakosUser.objects.get(email=email, is_active=True)

            if not user.has_usable_password():

                raise forms.ValidationError(_("This account has not a usable password."))

        except AstakosUser.DoesNotExist, e:

            raise forms.ValidationError(_('That e-mail address doesn\'t have an associated user account. Are you sure you\'ve registered?'))

        return email

    def save(self, domain_override=None, email_template_name='registration/password_reset_email.html',

             use_https=False, token_generator=default_token_generator, request=None):

        """

        Generates a one-use only link for resetting password and sends to the user.

        """

        for user in self.users_cache:

            url = reverse('django.contrib.auth.views.password_reset_confirm',

                          kwargs={'uidb36':int_to_base36(user.id),

                                  'token':token_generator.make_token(user)})

            url = urljoin(BASEURL, url)

            t = loader.get_template(email_template_name)

            c = {

                'email': user.email,

                'url': url,

                'site_name': SITENAME,

                'user': user,

                'baseurl': BASEURL,

                'support': DEFAULT_CONTACT_EMAIL

            }

            from_email = DEFAULT_FROM_EMAIL

            send_mail(_(PASSWORD_RESET_EMAIL_SUBJECT),

                t.render(Context(c)), from_email, [user.email])

class EmailChangeForm(forms.ModelForm):

    class Meta:

        model = EmailChange

        fields = ('new_email_address',)

    def clean_new_email_address(self):

        addr = self.cleaned_data['new_email_address']

        if AstakosUser.objects.filter(email__iexact=addr):

            raise forms.ValidationError(_(u'This email address is already in use. Please supply a different email address.'))

        return addr

    def save(self, email_template_name, request, commit=True):

        ec = super(EmailChangeForm, self).save(commit=False)

        ec.user = request.user

        activation_key = hashlib.sha1(str(random()) + smart_str(ec.new_email_address))

        ec.activation_key=activation_key.hexdigest()

        if commit:

            ec.save()

        send_change_email(ec, request, email_template_name=email_template_name)

class SignApprovalTermsForm(forms.ModelForm):

    class Meta:

        model = AstakosUser

        fields = ("has_signed_terms",)

    def __init__(self, *args, **kwargs):

        super(SignApprovalTermsForm, self).__init__(*args, **kwargs)

    def clean_has_signed_terms(self):

        has_signed_terms = self.cleaned_data['has_signed_terms']

        if not has_signed_terms:

            raise forms.ValidationError(_('You have to agree with the terms'))

        return has_signed_terms

class InvitationForm(forms.ModelForm):

    username = forms.EmailField(label=_("Email"))

    def __init__(self, *args, **kwargs):

        super(InvitationForm, self).__init__(*args, **kwargs)

    class Meta:

        model = Invitation

        fields = ('username', 'realname')

    def clean_username(self):

        username = self.cleaned_data['username']

        try:

            Invitation.objects.get(username = username)

            raise forms.ValidationError(_('There is already invitation for this email.'))

        except Invitation.DoesNotExist:

            pass

        return username

class ExtendedPasswordChangeForm(PasswordChangeForm):

    """

    Extends PasswordChangeForm by enabling user

    to optionally renew also the token.

    """

    if not NEWPASSWD_INVALIDATE_TOKEN:

        renew = forms.BooleanField(label='Renew token', required=False,

                                   initial=True,

                                   help_text='Unsetting this may result in security risk.')

    def __init__(self, user, *args, **kwargs):

        self.session_key = kwargs.pop('session_key', None)

        super(ExtendedPasswordChangeForm, self).__init__(user, *args, **kwargs)

    def save(self, commit=True):

        try:

            if NEWPASSWD_INVALIDATE_TOKEN or self.cleaned_data.get('renew'):

                self.user.renew_token()

            self.user.flush_sessions(current_key=self.session_key)

        except AttributeError:

            # if user model does has not such methods

            pass

        return super(ExtendedPasswordChangeForm, self).save(commit=commit)

class ExtendedSetPasswordForm(SetPasswordForm):

    """

    Extends SetPasswordForm by enabling user

    to optionally renew also the token.

    """

    if not NEWPASSWD_INVALIDATE_TOKEN:

        renew = forms.BooleanField(

            label='Renew token',

            required=False,

            initial=True,

            help_text='Unsetting this may result in security risk.'

        )

    def __init__(self, user, *args, **kwargs):

        super(ExtendedSetPasswordForm, self).__init__(user, *args, **kwargs)

    def save(self, commit=True):

        try:

            self.user = AstakosUser.objects.get(id=self.user.id)

            if NEWPASSWD_INVALIDATE_TOKEN or self.cleaned_data.get('renew'):

                self.user.renew_token()

            self.user.flush_sessions()

        except BaseException, e:

            logger.exception(e)

            pass

        return super(ExtendedSetPasswordForm, self).save(commit=commit)