# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
# SPDX-License-Identifier: GPL-3.0-or-later

from dal import autocomplete
from django.contrib.auth.mixins import LoginRequiredMixin
from django.db.models import Q
from django.urls import reverse
from django.utils.translation import gettext_lazy as _
from django.views.generic import CreateView, ListView, UpdateView

from django_tables2 import SingleTableView

from .forms import TransactionForm, TransactionTemplateForm, ConsoForm
from .models import Transaction, TransactionTemplate, Alias, TemplateTransaction
from .tables import ButtonTable

class TransactionCreateView(LoginRequiredMixin, SingleTableView):
    """
    View for the creation of Transaction between two note which are not :models:`transactions.RecurrentTransaction`.
    e.g. for donation/transfer between people and clubs or for credit/debit with :models:`note.NoteSpecial`
    """
    template_name = "note/transaction_form.html"

    model = Transaction
    form_class = TransactionForm

    def get_context_data(self, **kwargs):
        """
        Add some context variables in template such as page title
        """
        context = super().get_context_data(**kwargs)
        context['title'] = _('Transfer money from your account '
                             'to one or others')

        context['no_cache'] = True

        return context

    def get_form(self, form_class=None):
        """
        If the user has no right to transfer funds, then it won't have the choice of the source of the transfer.
        """
        form = super().get_form(form_class)

        if False:  # TODO: fix it with "if %user has no right to transfer funds"
            del form.fields['source']
            form.user = self.request.user

        return form

    def get_success_url(self):
        return reverse('note:transfer')


class NoteAutocomplete(autocomplete.Select2QuerySetView):
    """
    Auto complete note by aliases. Used in every search field for note
    ex: :view:`ConsoView`, :view:`TransactionCreateView`
    """

    def get_queryset(self):
        """
        When someone look for an :models:`note.Alias`, a query is sent to the dedicated API.
        This function handles the result and return a filtered list of aliases.
        """
        #  Un utilisateur non connecté n'a accès à aucune information
        if not self.request.user.is_authenticated:
            return Alias.objects.none()

        qs = Alias.objects.all()

        # self.q est le paramètre de la recherche
        if self.q:
            qs = qs.filter(Q(name__regex=self.q) | Q(normalized_name__regex=Alias.normalize(self.q))) \
                .order_by('normalized_name').distinct()

        # Filtrage par type de note (user, club, special)
        note_type = self.forwarded.get("note_type", None)
        if note_type:
            types = str(note_type).lower()
            if "user" in types:
                qs = qs.filter(note__polymorphic_ctype__model="noteuser")
            elif "club" in types:
                qs = qs.filter(note__polymorphic_ctype__model="noteclub")
            elif "special" in types:
                qs = qs.filter(note__polymorphic_ctype__model="notespecial")
            else:
                qs = qs.none()

        return qs

    def get_result_label(self, result):
        """
        Show the selected alias and the username associated
        <Alias> (aka. <Username> )
        """
        # Gère l'affichage de l'alias dans la recherche
        res = result.name
        note_name = str(result.note)
        if res != note_name:
            res += " (aka. " + note_name + ")"
        return res

    def get_result_value(self, result):
        """
        The value used for the transactions will be the id of the Note.
        """
        return str(result.note.pk)


class TransactionTemplateCreateView(LoginRequiredMixin, CreateView):
    """
    Create TransactionTemplate
    """
    model = TransactionTemplate
    form_class = TransactionTemplateForm


class TransactionTemplateListView(LoginRequiredMixin, SingleTableView):
    """
    List TransactionsTemplates
    """
    model = TransactionTemplate
    table_class = ButtonTable


class TransactionTemplateUpdateView(LoginRequiredMixin, UpdateView):
    """
    """
    model = TransactionTemplate
    form_class = TransactionTemplateForm


class ConsoView(LoginRequiredMixin, CreateView):
    """
    The Magic View that make people pay their beer and burgers.
    (Most of the magic happens in the dark world of Javascript see consos.js)
    """
    model = TemplateTransaction
    template_name = "note/conso_form.html"
    form_class = ConsoForm

    def get_context_data(self, **kwargs):
        """
        Add some context variables in template such as page title
        """
        context = super().get_context_data(**kwargs)
        context['transaction_templates'] = TransactionTemplate.objects.filter(display=True) \
            .order_by('category')
        context['title'] = _("Consommations")

        # select2 compatibility
        context['no_cache'] = True

        return context

    def get_success_url(self):
        """
        When clicking a button, reload the same page
        """
        return reverse('note:consos')