from __future__ import absolute_import

import os

from django import forms
from django.conf import settings
from django.contrib.auth import authenticate
from django.contrib.auth.forms import AuthenticationForm
from django.contrib.auth.models import User
from django.db import models
from django.utils.html import escape
from django.utils.translation import ugettext_lazy as _

from .utils import return_attrib
from .widgets import DetailSelectMultiple, PlainWidget, EmailInput


class DetailForm(forms.ModelForm):
    def __init__(self, extra_fields=None, *args, **kwargs):
        super(DetailForm, self).__init__(*args, **kwargs)
        if extra_fields:
            for extra_field in extra_fields:
                result = return_attrib(self.instance, extra_field['field'])
                label = 'label' in extra_field and extra_field['label'] or None
                #TODO: Add others result types <=> Field types
                if isinstance(result, models.query.QuerySet):
                    self.fields[extra_field['field']] = \
                        forms.ModelMultipleChoiceField(
                            queryset=result, label=label)
                else:
                    self.fields[extra_field['field']] = forms.CharField(
                        label=extra_field['label'],
                        initial=escape(return_attrib(self.instance,
                            extra_field['field'], None)),
                            widget=PlainWidget)

        for field_name, field in self.fields.items():
            if isinstance(field.widget, forms.widgets.SelectMultiple):
                self.fields[field_name].widget = DetailSelectMultiple(
                    choices=field.widget.choices,
                    attrs=field.widget.attrs,
                    queryset=getattr(field, 'queryset', None),
                )
                self.fields[field_name].help_text = ''
            elif isinstance(field.widget, forms.widgets.Select):
                self.fields[field_name].widget = DetailSelectMultiple(
                    choices=field.widget.choices,
                    attrs=field.widget.attrs,
                    queryset=getattr(field, 'queryset', None),
                )
                self.fields[field_name].help_text = ''

        for field_name, field in self.fields.items():
            self.fields[field_name].widget.attrs.update({'readonly': 'readonly'})


class GenericConfirmForm(forms.Form):
    def __init__(self, *args, **kwargs):
        pass


class GenericAssignRemoveForm(forms.Form):
    def __init__(self, *args, **kwargs):
        left_list_qryset = kwargs.pop('left_list_qryset', None)
        right_list_qryset = kwargs.pop('right_list_qryset', None)
        left_filter = kwargs.pop('left_filter', None)
        super(GenericAssignRemoveForm, self).__init__(*args, **kwargs)
        if left_filter:
            self.fields['left_list'].queryset = left_list_qryset.filter(
                *left_filter)
        else:
            self.fields['left_list'].queryset = left_list_qryset

        self.fields['right_list'].queryset = right_list_qryset

    left_list = forms.ModelMultipleChoiceField(required=False, queryset=None)
    right_list = forms.ModelMultipleChoiceField(required=False, queryset=None)


class FilterForm(forms.Form):
    def __init__(self, list_filters, *args, **kwargs):
        super(FilterForm, self).__init__(*args, **kwargs)
        for list_filter in list_filters:
            label = list_filter.get('title', list_filter['name'])
            self.fields[list_filter['name']] = forms.ModelChoiceField(
                queryset=list_filter['queryset'],
                label=label[0].upper() + label[1:], required=False)


class ChoiceForm(forms.Form):
    """
    Form to be used in side by side templates used to add or remove
    items from a many to many field
    """
    def __init__(self, *args, **kwargs):
        choices = kwargs.pop('choices', [])
        label = kwargs.pop('label', _(u'Selection'))
        super(ChoiceForm, self).__init__(*args, **kwargs)
        self.fields['selection'].choices = choices
        self.fields['selection'].label = label
        self.fields['selection'].widget.attrs.update({'size': 14, 'class': 'choice_form'})

    selection = forms.MultipleChoiceField()


class UserForm_view(DetailForm):
    """
    Form used to display an user's public details
    """
    class Meta:
        model = User
        fields = ('username', 'first_name', 'last_name', 'email', 'is_staff', 'is_superuser', 'last_login', 'date_joined', 'groups')


class UserForm(forms.ModelForm):
    """
    Form used to edit an user's mininal fields by the user himself
    """
    class Meta:
        model = User
        fields = ('username', 'first_name', 'last_name', 'email')


class EmailAuthenticationForm(AuthenticationForm):
    """
    Override the default authentication form to use email address
    authentication
    """
    email = forms.CharField(label=_(u'Email'), max_length=75,
        widget=EmailInput(attrs={'style': 'width: 100%;'})
    )

    def clean(self):
        email = self.cleaned_data.get('email')
        password = self.cleaned_data.get('password')

        if email and password:
            self.user_cache = authenticate(email=email, password=password)
            if self.user_cache is None:
                raise forms.ValidationError(_('Please enter a correct email and password. Note that the password fields is case-sensitive.'))
            elif not self.user_cache.is_active:
                raise forms.ValidationError(_('This account is inactive.'))
        self.check_for_test_cookie()
        return self.cleaned_data

# Remove the inherited username field
EmailAuthenticationForm.base_fields.keyOrder = ['email', 'password']


class FileDisplayForm(forms.Form):
    text = forms.CharField(
        label='',  # _(u'Text'),
        widget=forms.widgets.Textarea(
            attrs={'cols': 40, 'rows': 20, 'readonly': 'readonly'}
        )
    )

    def __init__(self, *args, **kwargs):
        super(FileDisplayForm, self).__init__(*args, **kwargs)
        changelog_path = os.path.join(settings.BASE_DIR, os.sep.join(self.DIRECTORY), self.FILENAME)
        fd = open(changelog_path)
        self.fields['text'].initial = fd.read()
        fd.close()


class LicenseForm(FileDisplayForm):
    FILENAME = u'LICENSE'
    DIRECTORY = [u'..']