import json
import urllib.parse

from django.conf import settings
from django.core.exceptions import ValidationError
from django.http import Http404, HttpResponse, HttpResponseRedirect
from django.shortcuts import get_object_or_404, redirect, resolve_url
from django.utils.decorators import method_decorator
from django.views import View
from django.views.decorators.csrf import csrf_exempt
from django.views.generic.base import ContextMixin, TemplateResponseMixin
from telegram.bot import Bot

from . import forms, models
from .telebot import get_bot_self, get_bot_self_uncached, run_telebot

# Create your views here.


class TemplateView(TemplateResponseMixin, ContextMixin, View):
    def get(self, request, *args, **kwargs):
        context = self.get_context_data(**kwargs)
        return self.render_to_response(context)


class RequireTelegramLogin:
    def __init__(self, func):
        self.func = func

    def __call__(self, request, *args, **kwargs):
        telegram_user_hash = request.COOKIES.get('user_hash', None)
        telegram_user = models.TelegramUser.objects.filter(
            uuid=telegram_user_hash).first()
        if telegram_user_hash is None or telegram_user is None:
            return redirect('home')
        return self.func(request=request, tg_user=telegram_user, *args, **kwargs)


class UseTelegramLogin:
    def __init__(self, func):
        self.func = func

    def __call__(self, request, *args, **kwargs):
        telegram_user_hash = request.COOKIES.get('user_hash', None)
        telegram_user = models.TelegramUser.objects.filter(
            uuid=telegram_user_hash).first()
        return self.func(request=request, tg_user=telegram_user, *args, **kwargs)


@method_decorator(UseTelegramLogin, 'dispatch')
class SoonView(TemplateView):
    template_name = "soon.haml"


@method_decorator(UseTelegramLogin, 'dispatch')
class HomeView(TemplateView):
    template_name = "index.haml"


@method_decorator(UseTelegramLogin, 'dispatch')
class TermsView(TemplateView):
    template_name = "terms.haml"


@method_decorator(UseTelegramLogin, 'dispatch')
class PrivacyView(TemplateView):
    template_name = "privacy.haml"


@method_decorator(UseTelegramLogin, 'dispatch')
class PythonLicensesView(TemplateView):
    template_name = "python_licenses.haml"


def setupWebHook(token):
    bot_webhook_url = f'https://{settings.FIRST_DOMAIN}/telegram/{token}/'
    Bot(token).set_webhook(url=bot_webhook_url)


class WebHookSetupView(View):
    def get(self, request):
        setupWebHook(settings.TELEGRAM_TOKEN)
        return HttpResponse()


@method_decorator(csrf_exempt, 'dispatch')
class WebHookView(View):
    def post(self, request, telegram):
        update = json.loads(request.body)
        run_telebot(telegram, update, request)
        print(json.dumps(update, indent=4))
        return HttpResponse()


class LoginView(View):
    def get(self, request, tuid, hsh):
        lh = models.LoginHash.objects.filter(id=tuid).first()
        if lh is None or str(lh.uuid) != hsh:
            hr = HttpResponse('Access Denied')
            hr.status_code = 401
            return hr
        response = redirect('control_panel')
        response.set_cookie(
            'user_hash', f'{lh.telegram_user.uuid}', expires=4*7*24*3600)
        lh.delete()
        return response


class LogoutView(View):
    def get(self, request):
        response = redirect('control_panel')
        response.delete_cookie('user_hash')
        return response


@method_decorator(RequireTelegramLogin, 'dispatch')
class ControlPanelView(TemplateView):
    template_name = 'control_panel.haml'


@method_decorator(RequireTelegramLogin, 'dispatch')
class AddTelegramBotView(View):
    def post(self, request, tg_user):
        token = request.POST.get('token', '')
        bot_self = get_bot_self(token=token)
        userBot = models.TelegramUserBots.objects.filter(token=token).first()
        if userBot is None:
            userBot = models.TelegramUserBots()
            userBot.owner = tg_user
            userBot.telegram_id = bot_self
            userBot.token = token
            userBot.save()
        get_bot_self_uncached(token=token)
        setupWebHook(token)
        return redirect('control_panel')


@method_decorator(RequireTelegramLogin, 'dispatch')
class DeleteAccountView(View):
    def post(self, request, tg_user):
        confirmation = request.POST.get('confirmation', '')
        if confirmation == 'Yes, delete my account and all its data':
            tg_user.delete()
            return redirect('logout')
        else:
            return HttpResponse('Strings do not match:<br>\n' +
                                f'{confirmation}<br>\n' +
                                'Yes, delete my account and all its data<br>\n' +
                                '<br>\n' +
                                'Nothing was done.')


@method_decorator(RequireTelegramLogin, 'dispatch')
class DeleteBot(TemplateView):
    template_name = 'delete_item.haml'

    def get_context_data(self, **kwargs):
        kwargs['display_template'] = 'delete_item_bot.haml'
        kwargs['previous'] = resolve_url('control_panel')
        kwargs['item'] = self._findFromContext(**kwargs)
        return super().get_context_data(**kwargs)

    def _findFromContext(self, **kwargs):
        return get_object_or_404(kwargs['tg_user'].bots, id=kwargs['bot_id'])

    def post(self, request, **kwargs):
        self._findFromContext(**kwargs).delete()
        return redirect('control_panel')


@ method_decorator(RequireTelegramLogin, 'dispatch')
class ManageGroupGenericView(TemplateView):
    def get(self, request, *args, **kwargs):
        return super().get(request, *args, **{'request_': request, **kwargs})

    def get_context_data(self, **kwargs):
        kwargs['group_preferences'] = self._findGroupPreferencesFromContext(
            **kwargs)
        kwargs['group'] = self._findGroupFromContext(**kwargs)
        kwargs = self._putForms(**kwargs)
        return super().get_context_data(**kwargs)

    def _findGroupFromContext(self, **kwargs):
        return get_object_or_404(kwargs['tg_user'].manages, id=kwargs['group_id'])

    def _findGroupPreferencesFromContext(self, **kwargs):
        group = self._findGroupFromContext(**kwargs)
        if getattr(group, 'preferences', None) is None:
            groupPreferences = models.GroupPreferences()
            groupPreferences.group = group
            groupPreferences.save()
            group = self._findGroupFromContext(**kwargs)
        return group.preferences

    def _putForms(self, **kwargs):
        request = kwargs['request_']
        if request.GET.get('form_validation_failed', 'n') == 'y':
            form = kwargs['form']
            form = self._restrain_form(
                form.__class__(request.GET, instance=form.instance),
                **{k: v for k, v in kwargs.items() if k != 'form'})
            kwargs['form'] = form
            form.full_clean()
        return kwargs

    def _restrain_form(self, form, **kwargs):
        return form

    def post(self, request, **kwargs):
        kwargs = self.get_context_data(**{**kwargs, 'request_': request})
        if (form := kwargs.get('form', None)) is not None:
            if request.POST.get('do', '') != 'delete':
                form = self._restrain_form(form.__class__(request.POST, instance=form.instance),
                                           **{k: v for k, v in kwargs.items() if k != 'form'})
                try:
                    form.full_clean()
                    form.save()
                except (ValueError, ValidationError):
                    postcopy = request.POST.copy()
                    postcopy['csrfmiddlewaretoken'] = ''
                    postcopy['do'] = ''
                    del postcopy['csrfmiddlewaretoken']
                    del postcopy['do']
                    return HttpResponseRedirect(f'{request.path}?form_validation_failed=y&{urllib.parse.urlencode(postcopy)}')
            else:
                form.instance.delete()
        return HttpResponseRedirect(kwargs.get('redirect_on_submit', None) or request.path)


class ManageGroupView(ManageGroupGenericView):
    template_name = 'manage_group.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('control_panel')
        return super().get_context_data(**kwargs)


class ManageGroupAntiSpamView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Anti-Spam'
        kwargs['form'] = forms.AntiSpam(instance=kwargs['group_preferences'])
        return super()._putForms(**kwargs)


class ManageGroupCAPTCHAView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'CAPTCHA'
        kwargs['form'] = forms.CAPTCHA(instance=kwargs['group_preferences'])
        return super()._putForms(**kwargs)


class ManageGroupJoinLeaveGreetingsView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Join/Leave Greetings'
        kwargs['form'] = forms.Greetings(instance=kwargs['group_preferences'])
        return super()._putForms(**kwargs)


class ManageGroupCannedMessageView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url(
            'manage_group_cannedmessages', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Canned Message'
        kwargs['canned_message'] = (
            kwargs['group_preferences'].canned_messages.filter(
                id=kwargs['cannedmessage_id']).first()
            or
            models.GroupCannedMessage(
                group_preferences=kwargs['group_preferences'])
        )
        kwargs['form'] = forms.CannedMessage(instance=kwargs['canned_message'])
        kwargs['deletion_allowed'] = not kwargs['canned_message']._state.adding
        kwargs['redirect_on_submit'] = kwargs['previous']
        return super()._putForms(**kwargs)


class ManageGroupCannedMessagesView(ManageGroupGenericView):
    template_name = 'manage_group_cannedmessages.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group', kwargs['group_id'])
        return super().get_context_data(**kwargs)


class ManageGroupPlannedMessagesView(ManageGroupGenericView):
    template_name = 'manage_group_plannedmessages.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group', kwargs['group_id'])
        return super().get_context_data(**kwargs)


class ManageGroupPlannedMessagesTimezoneView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group_plannedmessages', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Planned Messages\' Timezone'
        kwargs['form'] = forms.PlannedMessageTimezone(instance=kwargs['group_preferences'])
        kwargs['redirect_on_submit'] = kwargs['previous']
        return super()._putForms(**kwargs)


class ManageGroupPlannedMessageView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group_plannedmessages', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Canned Message'
        kwargs['planned_message'] = (
            kwargs['group_preferences'].planned_messages.filter(
                id=kwargs['plannedmessage_id']).first()
            or
            models.GroupPlannedMessage(
                group_preferences=kwargs['group_preferences'])
        )
        kwargs['form'] = forms.PlannedMessage(instance=kwargs['planned_message'])
        kwargs['deletion_allowed'] = not kwargs['planned_message']._state.adding
        kwargs['redirect_on_submit'] = kwargs['previous']
        return super()._putForms(**kwargs)


class ManageGroupPlannedDispatchView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group_plannedmessages', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Canned Message'
        kwargs['planned_dispatch'] = (
            kwargs['group_preferences'].planned_message_dispatches.filter(
                id=kwargs['planneddispatch_id']).first()
            or
            models.GroupPlannedDispatch(
                group_preferences=kwargs['group_preferences'])
        )
        kwargs['form'] = forms.PlannedDispatch(instance=kwargs['planned_dispatch'])
        kwargs['deletion_allowed'] = not kwargs['planned_dispatch']._state.adding
        kwargs['redirect_on_submit'] = kwargs['previous']
        return super()._putForms(**kwargs)


class ManageGroupPlannedEnablednessView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group_plannedmessages', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Planned Messages Configuration'
        kwargs['bot_choices'] = self.generate_bot_choices(**kwargs)
        kwargs['form'] = self._restrain_form(
            forms.PlannedMessageConfiguration(instance=kwargs['group_preferences']),
            **{k: v for k, v in kwargs.items() if k != 'form'})
        kwargs['redirect_on_submit'] = kwargs['previous']
        return super()._putForms(**kwargs)

    def generate_bot_choices(self, **kwargs):
        bot_choices = [
            (None, f'@{settings.BOT_NAME} (the shared bot)'),
        ]
        bots_considered = set([None])
        for bot in ([kwargs['group_preferences'].planned_message_issuer] + list(kwargs['tg_user'].bots.all())):
            if bot not in bots_considered:
                bot_choices.append((bot.id, f'@{bot.telegram_username} ({bot.telegram_id}) by {bot.owner.name}'))
                bots_considered.add(bot)
        return bot_choices

    def post(self, request, **kwargs):
        kwargs = self.get_context_data(**{**kwargs, 'request_': request})
        bot_choices = kwargs['bot_choices']
        result = super().post(request, **kwargs)
        group_preferences = models.GroupPreferences.objects.get(id=kwargs['group_preferences'].id)
        if group_preferences.planned_message_issuer is not None:
            disallowed_choice = True
            for bot_id, _ in bot_choices:
                if bot_id == group_preferences.planned_message_issuer.id:
                    disallowed_choice = False
                    break
            if disallowed_choice:
                group_preferences.planned_message_issuer = None
                group_preferences.save()
        return result

    def _restrain_form(self, form, **kwargs):
        form.fields['planned_message_issuer'].choices = kwargs['bot_choices']
        return super()._restrain_form(form, **kwargs)


class ManageAccessControlView(ManageGroupGenericView):
    template_name = 'manage_group_accesscontrol.haml'


class ManageAccessControlUseView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group_accesscontrol', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Access Control Policy'
        kwargs['form'] = forms.AccessControlUse(instance=kwargs['group_preferences'])
        kwargs['redirect_on_submit'] = kwargs['previous']
        return super()._putForms(**kwargs)


class ManageAccessControlGrantView(ManageGroupGenericView):
    template_name = 'manage_group_form.haml'
    MODEL = models.GroupAccessControlGrant

    template_name = 'manage_group_form.haml'

    def get_context_data(self, **kwargs):
        kwargs['previous'] = resolve_url('manage_group_accesscontrol', kwargs['group_id'])
        return super().get_context_data(**kwargs)

    def _putForms(self, **kwargs):
        kwargs['page_name'] = 'Access Control Grant'
        if 'accesscontrolgrant_id' not in kwargs:
            kwargs['accesscontrolgrant_id'] = 0
        kwargs['access_control_grant'] = (
            kwargs['group_preferences'].access_control_grants.filter(
                id=kwargs['accesscontrolgrant_id']).first()
            or
            models.GroupAccessControlGrant(
                group_preferences=kwargs['group_preferences'])
        )
        kwargs['admin_choices'] = self.generate_admin_choices(**kwargs)
        kwargs['form'] = self._restrain_form(
            forms.AccessControlGrant(instance=kwargs['access_control_grant']),
            **{k: v for k, v in kwargs.items() if k != 'form'})
        kwargs['deletion_allowed'] = not kwargs['access_control_grant']._state.adding
        kwargs['redirect_on_submit'] = kwargs['previous']
        return super()._putForms(**kwargs)

    def generate_admin_choices(self, **kwargs):
        admin_choices = []
        group = kwargs['group']
        group_preferences = kwargs['group_preferences']
        for admin in group.admins.all():
            if admin.as_bot is None:
                if models.GroupAccessControlGrant.objects.filter(group_preferences=group_preferences, allows=admin).first() is None:
                    admin_choices.append((admin.id, f'{admin.name} | @{admin.telegram_username or "--unset--"} ({admin.telegram_id})'))
        return admin_choices

    def _restrain_form(self, form, **kwargs):
        form.fields['allows'].choices = kwargs['admin_choices']
        return super()._restrain_form(form, **kwargs)


class ManageAccessControlRevokeView(ManageAccessControlGrantView):
    template_name = 'manage_group_formdelete.haml'

    def generate_admin_choices(self, **kwargs):
        admin_choices = []
        acg = kwargs['access_control_grant']
        if not acg._state.adding:
            admin = acg.allows
            admin_choices.append((admin.id, f'{admin.name} | @{admin.telegram_username or "--unset--"} ({admin.telegram_id})'))
        else:
            raise Http404
        return admin_choices

    def _putForms(self, **kwargs):
        new_kwargs = super()._putForms(**kwargs)
        new_kwargs['page_name'] = 'Access Control Revoke'
        return new_kwargs

    def _restrain_form(self, form, **kwargs):
        new_form = super()._restrain_form(form, **kwargs)
        for field in form.fields.items():
            field[1].widget.attrs['readonly'] = True
            field[1].widget.attrs['disabled'] = True
        return new_form