from django.views.generic import DetailView, FormView, RedirectView
from django.views.generic.detail import SingleObjectMixin
from django.contrib import messages
from django.shortcuts import redirect
from inventory.models import Game
from .models import AbstractLoan
from .forms import BorrowForm


class ReturnView(SingleObjectMixin, RedirectView):
    # Inherited classes should contain:
    # model = LoanModel
    # pattern_name = 
    redirect_slug_field = "slug"
 
    permanent = False

    def get_redirect_url(self, *args, **kwargs):
        loan = self.get_object()
        loan.return_object()
        kwargs[self.redirect_slug_field] = getattr(loan.lent_object,
            loan.lent_object_slug_field)
        messages.success(self.request, "Rendu effectué.")
        if "next" in self.request.GET:
            return self.request.GET["next"]
        return super().get_redirect_url(*args, **kwargs)


class BorrowView(SingleObjectMixin, FormView):
    # Inherited classes should contain:
    # model = LentObjectModel
    # loan_model = LoanModel
    # template_name = "path/to/template.html"
    form_class = BorrowForm # Update this for a more complex form

    def get_initial(self):
        initial = super().get_initial()
        if "loan_mail" in self.request.session:
            initial["mail"] = self.request.session["loan_mail"]
        return initial

    def get_context_data(self, **kwargs):
        self.object = self.get_object()
        return super().get_context_data(**kwargs)

    def form_valid(self, form):
        obj = self.get_object()
        ongoing = self.loan_model.ongoing_loans(obj)
        if ongoing.exists():
            ongoing.get().return_object()
        loan = self.loan_model(lent_object=obj, mail=form.cleaned_data["mail"])
        loan.save()
        self.request.session["loan_mail"] = loan.mail
        messages.success(self.request, "Votre emprunt est enregistré.")
        return redirect(self.success_pattern_name,
            getattr(obj, loan.lent_object_slug_field))

class DetailLoanView(DetailView):
    # Inherited classes should contain:
    # model = LentObjectModel
    # loan_model = LoanModel
    # template_name = "path/to/template.html"
    
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        loans = self.loan_model.ongoing_loans(self.get_object())
        is_borrowed = loans.exists()
        context["is_borrowed"] = is_borrowed 
        if is_borrowed:
            context["loan"] = loans.get()
        return context