import json
from datetime import timedelta

from django import forms
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.models import User
from django.contrib.auth.views import PasswordChangeView
from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import get_object_or_404, redirect, render
from django.urls import reverse_lazy
from django.views.generic import ListView
from django.views.generic.edit import UpdateView

from .models import Musician


class MusicianList(ListView):
    model = Musician

    def get_queryset(self):
        return Musician.objects.filter(user__is_active=True)


class UserEditForm(forms.ModelForm):
    email = forms.EmailField()

    class Meta:
        model = Musician
        exclude = [
            "user",
            "image",
            "small_image",
            "instrument",
            "position",
            "public_description",
        ]

    def __init__(self, *args, **kw):
        if "instance" in kw:
            user = kw["instance"].user
            initVals = {"email": user.email}
            if "initial" not in kw:
                kw["initial"] = initVals
            else:
                kw["initial"].update(initVals)

        super().__init__(*args, **kw)

        # Reorder fields to put email near the top
        if "email" in self.fields:
            email_field = self.fields.pop("email")
            new_fields = {}
            field_names = list(self.fields.keys())
            # Insert email at position 2 (after first two fields)
            for i, name in enumerate(field_names):
                if i == 2:
                    new_fields["email"] = email_field
                new_fields[name] = self.fields[name]
            if "email" not in new_fields:
                new_fields["email"] = email_field
            self.fields = new_fields

    def save(self, commit=True):
        if self.is_valid():
            instance = super().save(commit=commit)
            self.instance.user.email = self.cleaned_data["email"]
            self.instance.user.save()
            return instance
        return None


def own_profile(request):
    return user_edit(request, request.user)


def user_edit(request, username):
    musician = get_object_or_404(Musician, user__username=username)

    if request.method == "POST":
        form = UserEditForm(request.POST, instance=musician)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect("/")
    else:
        form = UserEditForm(instance=musician)

    return render(
        request, "musicians/musician_edit.html", {"form": form, "musician": musician}
    )


class MusicianUpdate(UpdateView):
    model = Musician
    template_name = "musicians/musician_edit.html"
    success_url = "/books/"
    fields = "__all__"


def addressbook(request):
    context = {}
    context["musicians"] = Musician.objects.filter(user__is_active=True).order_by("user__first_name")

    return render(request, "musicians/addressbook.html", context)


############################################################################################################
######################### User Management Views ############################################################
############################################################################################################


class ChangePasswordView(PasswordChangeView):
    template_name = "musicians/change_password.html"
    success_url = reverse_lazy("website:home")


def change_password(request):
    return ChangePasswordView.as_view()(request)


def logout_view(request):
    logout(request)
    return redirect(login_view)


def userlistForAutocompletion(request):
    result = [u.username for u in User.objects.all()]
    return HttpResponse(json.dumps(result), content_type="application/json")


def login_view(request):
    if request.method == "POST":
        raiseFirstLetter = lambda s: s[:1].upper() + s[1:] if s else ""
        username = raiseFirstLetter(request.POST.get("username", ""))
        password = request.POST.get("password", "")
        user = authenticate(request, username=username, password=password)
        result = {}
        result["err"] = ""
        if user is not None:
            if user.is_active:
                if not request.POST.get("remember", None):
                    # Expire in one year
                    request.session.set_expiry(timedelta(weeks=52))
                else:
                    # Expire on browser close
                    request.session.set_expiry(0)

                login(request, user)
                result["redirect"] = "/"
                if "next" in request.POST:
                    result["redirect"] = request.POST["next"]
            else:
                result["err"] = "Dein Account wurde deaktiviert."
        else:
            result["err"] = "Falscher Benutzername oder falsches Kennwort."

        return HttpResponse(json.dumps(result), content_type="application/json")

    else:
        # Check if user already logged in
        if request.user.is_authenticated:
            return redirect("/")

        if "next" in request.GET:
            nextPage = request.GET["next"]
        else:
            nextPage = "/"
        return render(request, "musicians/login.html", {"next": nextPage})