''' class views for password management '''
from django.contrib.auth import login
from django.contrib.auth.decorators import login_required
from django.core.exceptions import PermissionDenied
from django.shortcuts import redirect
from django.template.response import TemplateResponse
from django.utils.decorators import method_decorator
from django.views import View

from bookwyrm import models
from bookwyrm.emailing import password_reset_email


# pylint: disable= no-self-use
class PasswordResetRequest(View):
    ''' forgot password flow '''
    def get(self, request):
        ''' password reset page '''
        return TemplateResponse(
            request,
            'password_reset_request.html',
            {'title': 'Reset Password'}
        )

    def post(self, request):
        ''' create a password reset token '''
        email = request.POST.get('email')
        try:
            user = models.User.objects.get(email=email)
        except models.User.DoesNotExist:
            return redirect('/password-reset')

        # remove any existing password reset cods for this user
        models.PasswordReset.objects.filter(user=user).all().delete()

        # create a new reset code
        code = models.PasswordReset.objects.create(user=user)
        password_reset_email(code)
        data = {'message': 'Password reset link sent to %s' % email}
        return TemplateResponse(request, 'password_reset_request.html', data)


class PasswordReset(View):
    ''' set new password '''
    def get(self, request, code):
        ''' endpoint for sending invites '''
        if request.user.is_authenticated:
            return redirect('/')
        try:
            reset_code = models.PasswordReset.objects.get(code=code)
            if not reset_code.valid():
                raise PermissionDenied
        except models.PasswordReset.DoesNotExist:
            raise PermissionDenied

        return TemplateResponse(
            request,
            'password_reset.html',
            {'title': 'Reset Password', 'code': reset_code.code}
        )

    def post(self, request, code):
        ''' allow a user to change their password through an emailed token '''
        try:
            reset_code = models.PasswordReset.objects.get(
                code=code
            )
        except models.PasswordReset.DoesNotExist:
            data = {'errors': ['Invalid password reset link']}
            return TemplateResponse(request, 'password_reset.html', data)

        user = reset_code.user

        new_password = request.POST.get('password')
        confirm_password = request.POST.get('confirm-password')

        if new_password != confirm_password:
            data = {'errors': ['Passwords do not match']}
            return TemplateResponse(request, 'password_reset.html', data)

        user.set_password(new_password)
        user.save()
        login(request, user)
        reset_code.delete()
        return redirect('/')


@method_decorator(login_required, name='dispatch')
class ChangePassword(View):
    ''' change password as logged in user '''
    def get(self, request):
        ''' change password page '''
        data = {
            'title': 'Change Password',
            'user': request.user,
        }
        return TemplateResponse(
            request, 'preferences/change_password.html', data)

    def post(self, request):
        ''' allow a user to change their password '''
        new_password = request.POST.get('password')
        confirm_password = request.POST.get('confirm-password')

        if new_password != confirm_password:
            return redirect('preferences/password')

        request.user.set_password(new_password)
        request.user.save()
        login(request, request.user)
        return redirect(request.user.local_path)