from django import forms
from django.utils import formats
from django.conf import settings
from django.core import serializers
from django.core.mail import EmailMessage, EmailMultiAlternatives
from django.contrib.auth.forms import UserCreationForm, UserChangeForm, AuthenticationForm, PasswordResetForm
from registration.forms import RegistrationFormUniqueEmail
from django.contrib.auth.forms import AuthenticationForm
from captcha.fields import ReCaptchaField
import simplejson

from RIGS import models

# Override the django form defaults to use the HTML date/time/datetime UI elements
forms.DateField.widget = forms.DateInput(attrs={'type': 'date'})
forms.TimeField.widget = forms.TextInput(attrs={'type': 'time'})
forms.DateTimeField.widget = forms.DateTimeInput(attrs={'type': 'datetime-local'})

# Registration


class ProfileRegistrationFormUniqueEmail(RegistrationFormUniqueEmail):
    captcha = ReCaptchaField()

    class Meta:
        model = models.Profile
        fields = ('username', 'email', 'first_name', 'last_name', 'initials')

    def clean_initials(self):
        """
        Validate that the supplied initials are unique.
        """
        if models.Profile.objects.filter(initials__iexact=self.cleaned_data['initials']):
            raise forms.ValidationError("These initials are already in use. Please supply different initials.")
        return self.cleaned_data['initials']


class CheckApprovedForm(AuthenticationForm):
    def confirm_login_allowed(self, user):
        if user.is_approved or user.is_superuser:
            return AuthenticationForm.confirm_login_allowed(self, user)
        else:
            raise forms.ValidationError("Your account hasn't been approved by an administrator yet. Please check back in a few minutes!")


# Embedded Login form - remove the autofocus
class EmbeddedAuthenticationForm(CheckApprovedForm):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['username'].widget.attrs.pop('autofocus', None)


class PasswordReset(PasswordResetForm):
    captcha = ReCaptchaField(label='Captcha')


class ProfileCreationForm(UserCreationForm):
    class Meta(UserCreationForm.Meta):
        model = models.Profile


class ProfileChangeForm(UserChangeForm):
    class Meta(UserChangeForm.Meta):
        model = models.Profile


# Events Shit
class EventForm(forms.ModelForm):
    datetime_input_formats = formats.get_format_lazy("DATETIME_INPUT_FORMATS") + list(settings.DATETIME_INPUT_FORMATS)
    meet_at = forms.DateTimeField(input_formats=datetime_input_formats, required=False)
    access_at = forms.DateTimeField(input_formats=datetime_input_formats, required=False)

    items_json = forms.CharField()

    items = {}

    related_models = {
        'person': models.Person,
        'organisation': models.Organisation,
        'venue': models.Venue,
        'mic': models.Profile,
        'checked_in_by': models.Profile,
    }

    @property
    def _get_items_json(self):
        items = {}
        for item in self.instance.items.all():
            data = serializers.serialize('json', [item])
            struct = simplejson.loads(data)
            items[item.pk] = simplejson.dumps(struct[0])
        return simplejson.dumps(items)

    def __init__(self, *args, **kwargs):
        super(EventForm, self).__init__(*args, **kwargs)

        self.fields['items_json'].initial = self._get_items_json
        self.fields['start_date'].widget.format = '%Y-%m-%d'
        self.fields['end_date'].widget.format = '%Y-%m-%d'

        self.fields['access_at'].widget.format = '%Y-%m-%dT%H:%M:%S'
        self.fields['meet_at'].widget.format = '%Y-%m-%dT%H:%M:%S'

    def init_items(self):
        self.items = self.process_items_json()
        return self.items

    def process_items_json(self, event=None):
        data = simplejson.loads(self.cleaned_data['items_json'])
        items = {}
        for key in data:
            pk = int(key)
            items[pk] = self._get_or_initialise_item(pk, data[key]['fields'], event)

        return items

    def _get_or_initialise_item(self, pk, data, event):
        try:
            item = models.EventItem.objects.get(pk=pk, event=event)
        except models.EventItem.DoesNotExist:
            # This occurs for one of two reasons
            # 1) The event has been duplicated, so the item PKs belong to another event
            # 2) The items are brand new, with negative PK values
            # In either case, we want to create the items
            item = models.EventItem()

        # Take the data from the form and update the item object
        item.name = data['name']
        item.description = data['description']
        item.quantity = data['quantity']
        item.cost = data['cost']
        item.order = data['order']

        if (event):
            item.event = event
            item.full_clean()
        else:
            item.full_clean('event')

        return item

    def clean(self):
        if self.cleaned_data.get("is_rig") and not (self.cleaned_data.get('person') or self.cleaned_data.get('organisation')):
            raise forms.ValidationError('You haven\'t provided any client contact details. Please add a person or organisation.', code='contact')
        return super(EventForm, self).clean()

    def save(self, commit=True):
        m = super(EventForm, self).save(commit=False)

        if (commit):
            m.save()
            cur_items = m.items.all()
            items = self.process_items_json(m)
            # Delete any unneeded items
            for item in cur_items:
                if item.pk not in items:
                    item.delete()

            for key in items:
                items[key].save()

        return m

    class Meta:
        model = models.Event
        fields = ['is_rig', 'name', 'venue', 'start_time', 'end_date', 'start_date',
                  'end_time', 'meet_at', 'access_at', 'description', 'notes', 'mic',
                  'person', 'organisation', 'dry_hire', 'checked_in_by', 'status',
                  'purchase_order', 'collector']


class BaseClientEventAuthorisationForm(forms.ModelForm):
    tos = forms.BooleanField(required=True, label="Terms of hire")
    name = forms.CharField(label="Your Name")

    def clean(self):
        if self.cleaned_data.get('amount') != self.instance.event.total:
            self.add_error('amount', 'The amount authorised must equal the total for the event (inc VAT).')
        return super(BaseClientEventAuthorisationForm, self).clean()

    class Meta:
        abstract = True


class InternalClientEventAuthorisationForm(BaseClientEventAuthorisationForm):
    def __init__(self, **kwargs):
        super(InternalClientEventAuthorisationForm, self).__init__(**kwargs)
        self.fields['uni_id'].required = True
        self.fields['account_code'].required = True

    class Meta:
        model = models.EventAuthorisation
        fields = ('tos', 'name', 'amount', 'uni_id', 'account_code')


class EventAuthorisationRequestForm(forms.Form):
    email = forms.EmailField(required=True, label='Authoriser Email')
