from django import forms
from django.core.exceptions import ValidationError
from django.contrib.auth.models import User
from django.forms import modelformset_factory
from kfet.models import (Account, Checkout, Article, OperationGroup, Operation,
    CheckoutStatement)
from gestioncof.models import CofProfile

# -----
# Widgets
# -----

class DateTimeWidget(forms.DateTimeInput):
    def __init__(self, attrs = None):
        super(DateTimeWidget, self).__init__(attrs)
        self.attrs['format'] = '%Y-%m-%d %H:%M'
    class Media:
        css = {
                'all': ('bootstrap-datetimepicker.min.css',)
            }
        js  = (
                'moment.js',
                'moment-fr.js',
                'bootstrap-datetimepicker.min.js',
            )
# -----
# Account forms
# -----

class AccountForm(forms.ModelForm):

    # Surcharge pour passer data à Account.save()
    def save(self, data = {}, *args, **kwargs):
        obj = super(AccountForm, self).save(commit = False, *args, **kwargs)
        obj.save(data = data)
        return obj

    class Meta:
        model  = Account
        fields = ['trigramme', 'promo', 'nickname']
        widgets = {
            'trigramme': forms.TextInput(attrs={'autocomplete': 'off'}),
        }

class AccountTriForm(AccountForm):
    class Meta(AccountForm.Meta):
        fields = ['trigramme']

class AccountNoTriForm(AccountForm):
    class Meta(AccountForm.Meta):
        exclude = ['trigramme']

class AccountRestrictForm(AccountForm):
    class Meta(AccountForm.Meta):
        fields = ['promo']

class CofForm(forms.ModelForm):
    def clean_is_cof(self):
        instance = getattr(self, 'instance', None)
        if instance and instance.pk:
            return instance.is_cof
        else:
            return False
    class Meta:
        model  = CofProfile
        fields = ['login_clipper', 'is_cof', 'departement']

class CofRestrictForm(CofForm):
    class Meta(CofForm.Meta):
        fields = ['departement']

class UserForm(forms.ModelForm):
    class Meta:
        model  = User
        fields = ['username', 'first_name', 'last_name', 'email']
        help_texts = {
            'username': ''
        }

class UserRestrictForm(UserForm):
    class Meta(UserForm.Meta):
        fields = ['first_name', 'last_name', 'email']

# -----
# Checkout forms
# -----

class CheckoutForm(forms.ModelForm):
    class Meta:
        model   = Checkout
        fields  = ['name', 'valid_from', 'valid_to', 'balance', 'is_protected']
        widgets = {
            'valid_from': DateTimeWidget(),
            'valid_to'  : DateTimeWidget(),
        }

class CheckoutRestrictForm(CheckoutForm):
    class Meta(CheckoutForm.Meta):
        fields = ['name', 'valid_from', 'valid_to']

class CheckoutStatementForm(forms.ModelForm):
    class Meta:
        model = CheckoutStatement
        fields = ['balance_new', 'amount_taken']

# -----
# Article forms
# -----

class ArticleForm(forms.ModelForm):
    class Meta:
        model  = Article
        fields = ['name', 'is_sold', 'price', 'stock', 'category']

class ArticleRestrictForm(ArticleForm):
    class Meta(ArticleForm.Meta):
        fields = ['name', 'is_sold', 'price', 'category']

# -----
# K-Psul forms
# -----

class KPsulOperationGroupForm(forms.ModelForm):
    checkout = forms.ModelChoiceField(
        queryset = Checkout.objects.filter(is_protected=False),
        widget   = forms.HiddenInput())
    class Meta:
        model  = OperationGroup
        fields = ['on_acc', 'checkout']
        widgets = {
            'on_acc'  : forms.HiddenInput(),
        }

class KPsulAccountForm(forms.ModelForm):
    class Meta:
        model   = Account
        fields  = ['trigramme']
        widgets = {
            'trigramme': forms.TextInput(
                attrs={
                    'autocomplete': 'off',
                    'spellcheck': 'false',
                }),
        }

class KPsulCheckoutForm(forms.Form):
    checkout = forms.ModelChoiceField(
            queryset=Checkout.objects.filter(is_protected=False),
            widget=forms.Select(attrs={'id':'id_checkout_select'}))

class KPsulOperationForm(forms.ModelForm):
    article = forms.ModelChoiceField(
        queryset=Article.objects.select_related('category').all(),
        required=False,
        widget  = forms.HiddenInput())
    class Meta:
        model  = Operation
        fields = ['type', 'amount', 'is_checkout', 'article', 'article_nb']
        widgets = {
            'type': forms.HiddenInput(),
            'amount': forms.HiddenInput(),
            'is_checkout': forms.HiddenInput(),
            'article_nb': forms.HiddenInput(),
        }

    def clean(self):
        super(KPsulOperationForm, self).clean()
        type_ope   = self.cleaned_data.get('type')
        amount     = self.cleaned_data.get('amount')
        article    = self.cleaned_data.get('article')
        article_nb = self.cleaned_data.get('article_nb')
        if type_ope and type_ope == Operation.PURCHASE:
            if not article or not article_nb:
                raise ValidationError(
                    "Un achat nécessite un article et une quantité")
            if article_nb < 1:
                raise ValidationError("Impossible d'acheter moins de 1 article")
            self.cleaned_data['is_checkout'] = True
        elif type_ope and type_ope in [Operation.DEPOSIT, Operation.WITHDRAW]:
            if not amount or article or article_nb:
                raise ValidationError("Bad request")
            if type_ope == Operation.DEPOSIT and amount <= 0:
                raise ValidationError("Charge non positive")
            if type_ope == Operation.WITHDRAW and amount >= 0:
                raise ValidationError("Retrait non négatif")
            self.cleaned_data['article']    = None
            self.cleaned_data['article_nb'] = None

KPsulOperationFormSet = modelformset_factory(
    Operation,
    form    = KPsulOperationForm,
    can_delete = True,
    extra   = 0,
    min_num = 1, validate_min = True)