import socket

from six.moves.urllib.parse import urlparse

from django.forms.models import modelformset_factory
from django import forms
from django.utils.translation import ugettext, ugettext_lazy as _
from fobi.models import (
    # Plugins
    FormElement, FormHandler,

    # Entries
    FormEntry, FormFieldsetEntry, FormElementEntry, FormHandlerEntry
)

from .base import (
    get_registered_form_element_plugins, get_registered_form_handler_plugins,
    get_theme
)
from .constants import ACTION_CHOICES
from .exceptions import ImproperlyConfigured
from .validators import url_exists


__title__ = 'fobi.forms'
__author__ = 'Artur Barseghyan <artur.barseghyan@gmail.com>'
__copyright__ = '2014-2016 Artur Barseghyan'
__license__ = 'GPL 2.0/LGPL 2.1'
__all__ = (
    'FormEntryForm', 'FormFieldsetEntryForm', 'FormElementEntryFormSet',
    'BulkChangeFormElementPluginsForm', 'BulkChangeFormHandlerPluginsForm',
    'ImportFormEntryForm', 'FormHandlerForm', 'FormHandlerEntryForm'
)

# *****************************************************************************
# *****************************************************************************
# ******************************* Entry forms *********************************
# *****************************************************************************
# *****************************************************************************


class FormEntryForm(forms.ModelForm):
    """Form for ``fobi.models.FormEntry`` model."""

    class Meta:
        """Meta class."""

        model = FormEntry
        fields = ('name', 'is_public', 'success_page_title',
                  'success_page_message', 'action',)  # 'is_cloneable',

    def __init__(self, *args, **kwargs):
        """Constructor."""
        self.request = kwargs.pop('request', None)
        if self.request is None:
            raise ImproperlyConfigured(
                ugettext("The {0} form requires a "
                         "request argument.".format(self.__class__.__name__))
                )

        super(FormEntryForm, self).__init__(*args, **kwargs)
        theme = get_theme(request=None, as_instance=True)

        self.fields['name'].widget = forms.widgets.TextInput(
            attrs={'class': theme.form_element_html_class}
        )

        self.fields['success_page_title'].widget = forms.widgets.TextInput(
            attrs={'class': theme.form_element_html_class}
        )

        self.fields['success_page_message'].widget = forms.widgets.Textarea(
            attrs={'class': theme.form_element_html_class}
        )

        self.fields['action'].widget = forms.widgets.TextInput(
            attrs={'class': theme.form_element_html_class}
        )

        # At the moment this is done for Foundation 5 theme. Remove this once
        # it's possible for a theme to override this form. Alternatively, add
        # the attrs to the theme API.
        self.fields['is_public'].widget = forms.widgets.CheckboxInput(
            attrs={'data-customforms': 'disabled'}
        )
        # self.fields['is_cloneable'].widget = forms.widgets.CheckboxInput(
        #    attrs={'data-customforms': 'disabled'}
        # )

    def clean_action(self):
        """Validate the action (URL).

        Checks if URL exists.
        """
        url = self.cleaned_data['action']
        if url:
            full_url = url

            if not (url.startswith('http://') or url.startswith('https://')):
                full_url = self.request.build_absolute_uri(url)

            parsed_url = urlparse(full_url)

            local = False

            try:
                localhost = socket.gethostbyname('localhost')
            except Exception as err:
                localhost = '127.0.0.1'

            try:
                host = socket.gethostbyname(parsed_url.hostname)

                local = (localhost == host)
            except socket.gaierror as err:
                pass

            if local:
                full_url = parsed_url.path

            if not url_exists(full_url, local=local):
                raise forms.ValidationError(
                    ugettext("Invalid action URL {0}.").format(full_url)
                )

        return url


class FormFieldsetEntryForm(forms.ModelForm):
    """Form for ``fobi.models.FormFieldsetEntry`` model."""

    class Meta:
        """Meta class."""

        model = FormFieldsetEntry
        fields = ('name',)

    def __init__(self, *args, **kwargs):
        """Constructor."""
        super(FormFieldsetEntryForm, self).__init__(*args, **kwargs)
        theme = get_theme(request=None, as_instance=True)
        self.fields['name'].widget = forms.widgets.TextInput(
            attrs={'class': theme.form_element_html_class}
        )


class FormElementForm(forms.ModelForm):
    """FormElement form."""

    # plugin_uid = forms.ChoiceField(
    #     choices=get_registered_form_element_plugins()
    # )

    class Meta:
        """Meta class."""

        model = FormElement
        fields = ('users', 'groups')


class FormElementEntryForm(forms.ModelForm):
    """FormElementEntry form."""

    plugin_uid = forms.ChoiceField(
        choices=get_registered_form_element_plugins()
    )

    class Meta:
        """Meta class."""

        model = FormElementEntry
        fields = ('form_entry', 'plugin_data', 'plugin_uid', 'position')


FormElementEntryFormSet = modelformset_factory(
    FormElementEntry, fields=('position',), extra=0, form=FormElementEntryForm
)


class FormHandlerForm(forms.ModelForm):
    """FormHandler form."""

    # plugin_uid = forms.ChoiceField(
    #     choices=get_registered_form_handler_plugins()
    # )

    class Meta:
        """Meta class."""

        model = FormHandler
        fields = ('users', 'groups')


class FormHandlerEntryForm(forms.ModelForm):
    """FormHandlerEntry form."""

    plugin_uid = forms.ChoiceField(
        choices=get_registered_form_handler_plugins()
    )

    class Meta:
        """Meta class."""

        model = FormHandlerEntry
        fields = ('form_entry', 'plugin_data', 'plugin_uid')

# *****************************************************************************
# *****************************************************************************
# *********************************** Base ************************************
# *****************************************************************************
# *****************************************************************************


class BaseBulkChangePluginsForm(forms.ModelForm):
    """Bulk change plugins form.

    - `selected_plugins` (str): List of comma separated values to be
       changed.
    - `users_action` (int): For indicating wheither the users shall be appended
      to the dashbard plugins or replaced.
    - `groups_action` (int): For indicating wheither the groups shall be
      appended to the dashboard plugins or replaced.
    """

    selected_plugins = forms.CharField(
        required=True,
        label=_("Selected plugins"),
        widget=forms.widgets.HiddenInput
    )
    users_action = forms.ChoiceField(
        required=False,
        label=_("Users action"),
        choices=ACTION_CHOICES,
        help_text=_("If set to ``replace``, the groups are replaced; "
                    "otherwise - appended.")
    )
    groups_action = forms.ChoiceField(
        required=False,
        label=_("Groups action"),
        choices=ACTION_CHOICES,
        help_text=_("If set to ``replace``, the groups are replaced; "
                    "otherwise - appended.")
    )

    class Media:
        """Media class."""

        css = {
            'all': ('css/admin_custom.css',)
        }

    def __init__(self, *args, **kwargs):
        """Constructor."""
        super(BaseBulkChangePluginsForm, self).__init__(*args, **kwargs)
        self.fields['users'].required = False
        self.fields['groups'].required = False


class BulkChangeFormElementPluginsForm(BaseBulkChangePluginsForm):
    """Bulk change form element plugins form."""

    class Meta:
        """Meta class."""

        model = FormElement
        fields = ['groups', 'groups_action', 'users', 'users_action']


class BulkChangeFormHandlerPluginsForm(BaseBulkChangePluginsForm):
    """Bulk change form handler plugins form."""

    class Meta:
        """Meta class."""

        model = FormHandler
        fields = ['groups', 'groups_action', 'users', 'users_action']

# *****************************************************************************
# *****************************************************************************
# **************************** Import form entry ******************************
# *****************************************************************************
# *****************************************************************************


class ImportFormEntryForm(forms.Form):
    """Import form entry form."""

    file = forms.FileField(required=True, label=_("File"))
    # ignore_broken_form_element_entries = forms.BooleanField(
    #     required=False,
    #     label=_("Ignore broken form element entries"))
    # ignore_broken_form_handler_entries = forms.BooleanField(
    #     required=False,
    #     label=_("Ignore broken form handler entries"))