from datetime import timedelta
from decimal import Decimal

from django import forms
from django.contrib.auth.models import User
from django.core import validators
from django.core.exceptions import ValidationError
from django.forms import modelformset_factory
from django.utils import timezone
from django.utils.translation import ugettext_lazy as _
from djconfig.forms import ConfigForm

from gestioncof.models import CofProfile
from kfet.models import (
    Account,
    AccountNegative,
    Article,
    ArticleCategory,
    Checkout,
    CheckoutStatement,
    Operation,
    OperationGroup,
    Supplier,
    Transfer,
    TransferGroup,
)
from kfet.statistic import SCALE_CLASS_CHOICES

from . import KFET_DELETED_TRIGRAMME
from .auth import KFET_GENERIC_TRIGRAMME
from .auth.forms import UserGroupForm  # noqa

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


class DateTimeWidget(forms.DateTimeInput):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.attrs["format"] = "%Y-%m-%d %H:%M"

    class Media:
        css = {"all": ("kfet/vendor/bootstrap/bootstrap-datetimepicker.min.css",)}
        js = ("kfet/vendor/bootstrap/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().save(commit=False, *args, **kwargs)
        obj.save(data=data)
        return obj

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


class AccountBalanceForm(forms.ModelForm):
    class Meta:
        model = Account
        fields = ["balance"]


class AccountTriForm(AccountForm):
    def clean_trigramme(self):
        trigramme = self.cleaned_data["trigramme"]
        return trigramme.upper()

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


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


class AccountRestrictForm(AccountForm):
    class Meta(AccountForm.Meta):
        fields = ["is_frozen"]


class AccountPwdForm(forms.Form):
    pwd1 = forms.CharField(
        label="Mot de passe K-Fêt",
        required=False,
        help_text="Le mot de passe doit contenir au moins huit caractères",
        widget=forms.PasswordInput,
    )
    pwd2 = forms.CharField(
        label="Confirmer le mot de passe", required=False, widget=forms.PasswordInput
    )

    def clean(self):
        pwd1 = self.cleaned_data.get("pwd1", "")
        pwd2 = self.cleaned_data.get("pwd2", "")
        if len(pwd1) < 8:
            raise ValidationError("Mot de passe trop court")
        if pwd1 != pwd2:
            raise ValidationError("Les mots de passes sont différents")
        super().clean()


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 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"]


class UserInfoForm(UserForm):
    first_name = forms.CharField(label="Prénom", disabled=True)
    last_name = forms.CharField(label="Nom de famille", disabled=True)

    class Meta(UserForm.Meta):
        fields = ["first_name", "last_name"]


class AccountNegativeForm(forms.ModelForm):
    class Meta:
        model = AccountNegative
        fields = [
            "authz_overdraft_amount",
            "authz_overdraft_until",
            "balance_offset",
            "comment",
        ]
        widgets = {"authz_overdraft_until": DateTimeWidget()}


# -----
# 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 CheckoutStatementCreateForm(forms.ModelForm):
    balance_001 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_002 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_005 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_01 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_02 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_05 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_1 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_2 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_5 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_10 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_20 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_50 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_100 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_200 = forms.IntegerField(min_value=0, initial=0, required=False)
    balance_500 = forms.IntegerField(min_value=0, initial=0, required=False)

    class Meta:
        model = CheckoutStatement
        exclude = [
            "by",
            "at",
            "checkout",
            "amount_error",
            "amount_taken",
            "balance_old",
            "balance_new",
        ]

    def clean(self):
        not_count = self.cleaned_data["not_count"]
        if not not_count and (
            self.cleaned_data["balance_001"] is None
            or self.cleaned_data["balance_002"] is None
            or self.cleaned_data["balance_005"] is None
            or self.cleaned_data["balance_01"] is None
            or self.cleaned_data["balance_02"] is None
            or self.cleaned_data["balance_05"] is None
            or self.cleaned_data["balance_1"] is None
            or self.cleaned_data["balance_2"] is None
            or self.cleaned_data["balance_5"] is None
            or self.cleaned_data["balance_10"] is None
            or self.cleaned_data["balance_20"] is None
            or self.cleaned_data["balance_50"] is None
            or self.cleaned_data["balance_100"] is None
            or self.cleaned_data["balance_200"] is None
            or self.cleaned_data["balance_500"] is None
        ):
            raise ValidationError(
                "Y'a un problème. Si tu comptes la caisse, mets au moins des 0 stp."
            )
        super().clean()


class CheckoutStatementUpdateForm(forms.ModelForm):
    class Meta:
        model = CheckoutStatement
        exclude = ["by", "at", "checkout", "amount_error", "amount_taken"]


# -----
# Category
# -----


class CategoryForm(forms.ModelForm):
    class Meta:
        model = ArticleCategory
        fields = ["name", "has_addcost", "has_reduction"]


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


class ArticleForm(forms.ModelForm):
    category_new = forms.CharField(
        label="Créer une catégorie", max_length=45, required=False
    )
    category = forms.ModelChoiceField(
        label="Catégorie", queryset=ArticleCategory.objects.all(), required=False
    )

    suppliers = forms.ModelMultipleChoiceField(
        label="Fournisseurs", queryset=Supplier.objects.all(), required=False
    )
    supplier_new = forms.CharField(
        label="Créer un fournisseur", max_length=45, required=False
    )

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if self.instance.pk:
            self.initial["suppliers"] = self.instance.suppliers.values_list(
                "pk", flat=True
            )

    def clean(self):
        category = self.cleaned_data.get("category")
        category_new = self.cleaned_data.get("category_new")

        if not category and not category_new:
            raise ValidationError("Sélectionnez une catégorie ou créez en une")
        elif not category:
            category, _ = ArticleCategory.objects.get_or_create(name=category_new)
            self.cleaned_data["category"] = category

        super().clean()

    class Meta:
        model = Article
        fields = [
            "name",
            "is_sold",
            "hidden",
            "price",
            "stock",
            "category",
            "box_type",
            "box_capacity",
        ]


class ArticleRestrictForm(ArticleForm):
    class Meta(ArticleForm.Meta):
        fields = [
            "name",
            "is_sold",
            "hidden",
            "price",
            "category",
            "box_type",
            "box_capacity",
        ]


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


class KPsulOperationGroupForm(forms.ModelForm):
    # FIXME(AD): Use timezone.now instead of timezone.now() to avoid using a
    # fixed datetime (application boot here).
    # One may even use: Checkout.objects.is_valid() if changing
    # to now = timezone.now is ok in 'is_valid' definition.
    checkout = forms.ModelChoiceField(
        queryset=Checkout.objects.filter(
            is_protected=False,
            valid_from__lte=timezone.now(),
            valid_to__gte=timezone.now(),
        ),
        widget=forms.HiddenInput(),
    )
    on_acc = forms.ModelChoiceField(
        queryset=Account.objects.exclude(
            trigramme__in=[KFET_DELETED_TRIGRAMME, KFET_GENERIC_TRIGRAMME]
        ),
        widget=forms.HiddenInput(),
    )

    class Meta:
        model = OperationGroup
        fields = ["on_acc", "checkout", "comment"]


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=None, widget=forms.Select(attrs={"id": "id_checkout_select"})
    )

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

        # Create the queryset on form instanciation to use the current time.
        self.fields["checkout"].queryset = Checkout.objects.is_valid().filter(
            is_protected=False
        )


class KPsulOperationForm(forms.ModelForm):
    article = forms.ModelChoiceField(
        queryset=Article.objects.select_related("category").all(),
        required=False,
        widget=forms.HiddenInput(),
    )
    article_nb = forms.IntegerField(
        required=False,
        initial=None,
        validators=[validators.MinValueValidator(1)],
        widget=forms.HiddenInput(),
    )

    class Meta:
        model = Operation
        fields = ["type", "amount", "article", "article_nb"]
        widgets = {"type": forms.HiddenInput(), "amount": forms.HiddenInput()}

    def clean(self):
        super().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")
        errors = []
        if type_ope and type_ope == Operation.PURCHASE:
            if not article or article_nb is None or article_nb < 1:
                errors.append(
                    ValidationError("Un achat nécessite un article et une quantité")
                )
        elif type_ope and type_ope in [Operation.DEPOSIT, Operation.WITHDRAW]:
            if not amount or article or article_nb:
                errors.append(ValidationError("Bad request"))
            else:
                if type_ope == Operation.DEPOSIT and amount <= 0:
                    errors.append(ValidationError("Charge non positive"))
                elif type_ope == Operation.WITHDRAW and amount >= 0:
                    errors.append(ValidationError("Retrait non négatif"))
            self.cleaned_data["article"] = None
            self.cleaned_data["article_nb"] = None

        if errors:
            raise ValidationError(errors)


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


class AddcostForm(forms.Form):
    trigramme = forms.CharField(required=False)
    amount = forms.DecimalField(
        required=False, max_digits=6, decimal_places=2, min_value=Decimal(0)
    )

    def clean(self):
        trigramme = self.cleaned_data.get("trigramme")
        if trigramme:
            try:
                Account.objects.get(trigramme=trigramme)
            except Account.DoesNotExist:
                raise ValidationError("Compte invalide")
        else:
            self.cleaned_data["amount"] = 0
        super().clean()


# -----
# Settings forms
# -----


class KFetConfigForm(ConfigForm):

    kfet_reduction_cof = forms.DecimalField(
        label="Réduction COF",
        initial=Decimal("20"),
        max_digits=6,
        decimal_places=2,
        help_text="Réduction, à donner en pourcentage, appliquée lors d'un "
        "achat par un-e membre du COF sur le montant en euros.",
    )
    kfet_addcost_amount = forms.DecimalField(
        label="Montant de la majoration (en €)",
        initial=Decimal("0"),
        required=False,
        max_digits=6,
        decimal_places=2,
    )
    kfet_addcost_for = forms.ModelChoiceField(
        label="Destinataire de la majoration",
        initial=None,
        required=False,
        help_text="Laissez vide pour désactiver la majoration.",
        queryset=(
            Account.objects.select_related("cofprofile", "cofprofile__user").all()
        ),
    )
    kfet_overdraft_duration = forms.DurationField(
        label="Durée du découvert autorisé par défaut", initial=timedelta(days=1)
    )
    kfet_overdraft_amount = forms.DecimalField(
        label="Montant du découvert autorisé par défaut (en €)",
        initial=Decimal("20"),
        max_digits=6,
        decimal_places=2,
    )
    kfet_cancel_duration = forms.DurationField(
        label="Durée pour annuler une commande sans mot de passe",
        initial=timedelta(minutes=5),
    )


class FilterHistoryForm(forms.Form):
    start = forms.DateTimeField(label=_("De"), widget=DateTimeWidget, required=False)
    end = forms.DateTimeField(label=_("À"), widget=DateTimeWidget, required=False)
    checkout = forms.ModelChoiceField(
        label=_("Caisse"),
        queryset=Checkout.objects.all(),
        required=False,
        empty_label=_("Toutes les caisses"),
    )
    account = forms.ModelChoiceField(
        label=_("Compte"),
        queryset=Account.objects.all(),
        required=False,
        empty_label=_("Tous les comptes"),
    )

    transfers_only = forms.BooleanField(widget=forms.HiddenInput, required=False)
    opes_only = forms.BooleanField(widget=forms.HiddenInput, required=False)


# -----
# Transfer forms
# -----


class TransferGroupForm(forms.ModelForm):
    class Meta:
        model = TransferGroup
        fields = ["comment"]


class TransferForm(forms.ModelForm):
    from_acc = forms.ModelChoiceField(
        queryset=Account.objects.exclude(trigramme__in=["LIQ", "#13", "GNR"]),
        widget=forms.HiddenInput(),
    )
    to_acc = forms.ModelChoiceField(
        queryset=Account.objects.exclude(trigramme__in=["LIQ", "#13", "GNR"]),
        widget=forms.HiddenInput(),
    )

    def clean_amount(self):
        amount = self.cleaned_data["amount"]
        if amount <= 0:
            raise forms.ValidationError("Montant invalide")
        return amount

    class Meta:
        model = Transfer
        fields = ["from_acc", "to_acc", "amount"]


TransferFormSet = modelformset_factory(
    Transfer, form=TransferForm, min_num=1, validate_min=True, extra=9
)

# -----
# Inventory forms
# -----


class InventoryArticleForm(forms.Form):
    article = forms.ModelChoiceField(
        queryset=Article.objects.all(), widget=forms.HiddenInput()
    )
    stock_new = forms.IntegerField(required=False)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if "initial" in kwargs:
            self.name = kwargs["initial"]["name"]
            self.stock_old = kwargs["initial"]["stock_old"]
            self.category = kwargs["initial"]["category"]
            self.category_name = kwargs["initial"]["category__name"]
            self.box_capacity = kwargs["initial"]["box_capacity"]
            self.is_sold = kwargs["initial"]["is_sold"]


# -----
# Order forms
# -----


class OrderArticleForm(forms.Form):
    article = forms.ModelChoiceField(
        queryset=Article.objects.all(), widget=forms.HiddenInput()
    )
    quantity_ordered = forms.IntegerField(required=False)

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if "initial" in kwargs:
            self.name = kwargs["initial"]["name"]
            self.stock = kwargs["initial"]["stock"]
            self.category = kwargs["initial"]["category"]
            self.category_name = kwargs["initial"]["category__name"]
            self.box_capacity = kwargs["initial"]["box_capacity"]
            self.v_all = kwargs["initial"]["v_all"]
            self.v_moy = kwargs["initial"]["v_moy"]
            self.v_et = kwargs["initial"]["v_et"]
            self.v_prev = kwargs["initial"]["v_prev"]
            self.c_rec = kwargs["initial"]["c_rec"]
            self.is_sold = kwargs["initial"]["is_sold"]


class OrderArticleToInventoryForm(forms.Form):
    article = forms.ModelChoiceField(
        queryset=Article.objects.all(), widget=forms.HiddenInput()
    )
    price_HT = forms.DecimalField(max_digits=7, decimal_places=4, required=False)
    TVA = forms.DecimalField(max_digits=7, decimal_places=2, required=False)
    rights = forms.DecimalField(max_digits=7, decimal_places=4, required=False)
    quantity_received = forms.IntegerField()

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if "initial" in kwargs:
            self.name = kwargs["initial"]["name"]
            self.category = kwargs["initial"]["category"]
            self.category_name = kwargs["initial"]["category__name"]
            self.quantity_ordered = kwargs["initial"]["quantity_ordered"]


# ----
# Formulaires pour les statistiques K-Fêt
# ----


class StatScaleForm(forms.Form):
    """Formulaire pour nettoyer les paramètres envoyés aux
    vues de statistiques K-Fêt. Non destiné à être affiché.
    """

    name = forms.ChoiceField(choices=SCALE_CLASS_CHOICES)
    begin = forms.DateTimeField(required=False)
    end = forms.DateTimeField(required=False)
    n_steps = forms.IntegerField(required=False)
    last = forms.BooleanField(required=False)


class AccountStatForm(forms.Form):
    """ Idem, mais pour la balance d'un compte """

    begin_date = forms.DateTimeField(required=False)
    end_date = forms.DateTimeField(required=False)
    last_days = forms.IntegerField(required=False)