from datetime import datetime

from django.shortcuts import redirect
from django.urls import reverse_lazy
from django.views.generic import TemplateView, ListView, UpdateView
from django.contrib.auth.mixins import LoginRequiredMixin
from django.utils import timezone
from .models import Item, Machine

# Класс главной страницы (роутер)
class IndexView(TemplateView):
    template_name = 'shiftflow/landing.html'

    def get(self, request, *args, **kwargs):
        # Если юзер авторизован — сразу отправляем его в реестр
        if request.user.is_authenticated:
            return redirect('registry')
        # Если нет — показываем кнопку "Войти"
        return super().get(request, *args, **kwargs)

# Класс реестра деталей (защищен LoginRequiredMixin)
class RegistryView(LoginRequiredMixin, ListView):
    model = Item
    template_name = 'shiftflow/registry.html'
    context_object_name = 'items'

    def get_queryset(self):
        queryset = Item.objects.select_related('task', 'task__deal', 'task__material', 'machine')
        user = self.request.user
        profile = getattr(user, 'profile', None)
        role = profile.role if profile else 'operator'
        filtered = self.request.GET.get('filtered')

        # Станки
        m_ids = self.request.GET.getlist('m_ids')
        if filtered and role != 'operator' and not m_ids:
            return queryset.none()
        if m_ids:
            queryset = queryset.filter(machine_id__in=m_ids)

        # Статусы (+ агрегат "closed" = done+partial)
        statuses = self.request.GET.getlist('statuses')
        if filtered and not statuses:
            return queryset.none()
        if statuses:
            expanded = []
            for s in statuses:
                if s == 'closed':
                    expanded += ['done', 'partial']
                else:
                    expanded.append(s)
            queryset = queryset.filter(status__in=expanded)

        # Даты
        start_date = self.request.GET.get('start_date')
        end_date = self.request.GET.get('end_date')
        if not filtered:
            today = timezone.localdate()
            if role == 'clerk':
                queryset = queryset.filter(date=today, status__in=['done', 'partial'])
            elif role in ['operator', 'master']:
                queryset = queryset.filter(date=today, status__in=['work'])
            else:
                queryset = queryset.filter(date=today, status__in=['work', 'leftover'])
        else:
            if start_date:
                queryset = queryset.filter(date__gte=start_date)
            if end_date:
                queryset = queryset.filter(date__lte=end_date)

        # Списание (1С)
        is_synced = self.request.GET.get('is_synced')
        if is_synced in ['0', '1']:
            queryset = queryset.filter(is_synced_1c=bool(int(is_synced)))

        # Ограничения по ролям
        if role == 'operator':
            user_machines = profile.machines.all() if profile else Machine.objects.none()
            queryset = queryset.filter(machine__in=user_machines)
            if not filtered:
                queryset = queryset.filter(status='work')
        elif role == 'master' and not filtered:
            queryset = queryset.filter(status='work')

        return queryset.order_by('status', '-date', 'machine__name', 'task__deal__number')

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        user = self.request.user
        profile = getattr(user, 'profile', None)
        role = profile.role if profile else 'operator'
        context['user_role'] = role

        machines = Machine.objects.all()
        context['machines'] = machines
        filtered = self.request.GET.get('filtered')

        if not filtered:
            today_str = timezone.localdate().strftime('%Y-%m-%d')
            context['start_date'] = today_str
            context['end_date'] = today_str
            if role == 'clerk':
                context['selected_statuses'] = ['closed']
            elif role in ['operator', 'master']:
                context['selected_statuses'] = ['work']
            else:
                context['selected_statuses'] = ['work', 'leftover']
            context['selected_machines'] = [m.id for m in machines]
            context['all_selected_machines'] = True
        else:
            context['selected_machines'] = [int(i) for i in self.request.GET.getlist('m_ids') if i.isdigit()]
            context['selected_statuses'] = self.request.GET.getlist('statuses')
            context['start_date'] = self.request.GET.get('start_date', '')
            context['end_date'] = self.request.GET.get('end_date', '')
            context['is_synced'] = self.request.GET.get('is_synced', '')
            context['all_selected_machines'] = False

        return context


class RegistryPrintView(LoginRequiredMixin, TemplateView):
    template_name = 'shiftflow/registry_print.html'

    def dispatch(self, request, *args, **kwargs):
        profile = getattr(request.user, 'profile', None)
        role = profile.role if profile else 'operator'
        if role not in ['admin', 'technologist', 'master']:
            return redirect('registry')
        return super().dispatch(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        profile = getattr(self.request.user, 'profile', None)
        role = profile.role if profile else 'operator'
        context['user_role'] = role

        queryset = Item.objects.select_related('task', 'task__deal', 'task__material', 'task__material__category', 'machine')
        filtered = self.request.GET.get('filtered')

        m_ids = self.request.GET.getlist('m_ids')
        if filtered and not m_ids:
            queryset = queryset.none()
        if m_ids:
            queryset = queryset.filter(machine_id__in=m_ids)

        statuses = self.request.GET.getlist('statuses')
        if filtered and not statuses:
            queryset = queryset.none()
        if statuses:
            expanded = []
            for s in statuses:
                if s == 'closed':
                    expanded += ['done', 'partial']
                else:
                    expanded.append(s)
            queryset = queryset.filter(status__in=expanded)

        start_date = self.request.GET.get('start_date')
        end_date = self.request.GET.get('end_date')
        if not filtered:
            today = timezone.localdate()
            queryset = queryset.filter(date=today, status__in=['work', 'leftover'])
            start_date = today.strftime('%Y-%m-%d')
            end_date = start_date
        else:
            if start_date:
                queryset = queryset.filter(date__gte=start_date)
            if end_date:
                queryset = queryset.filter(date__lte=end_date)

        is_synced = self.request.GET.get('is_synced')
        if is_synced in ['0', '1']:
            queryset = queryset.filter(is_synced_1c=bool(int(is_synced)))

        if role == 'master' and not filtered:
            queryset = queryset.filter(status='work')

        items = list(queryset.order_by('machine__name', 'date', 'task__deal__number', 'id'))
        groups = {}
        for item in items:
            groups.setdefault(item.machine, []).append(item)

        context['groups'] = list(groups.items())
        context['printed_at'] = timezone.now()
        context['end_date'] = end_date or ''

        print_date_raw = end_date or start_date
        print_date = None
        if isinstance(print_date_raw, str) and print_date_raw:
            try:
                print_date = datetime.strptime(print_date_raw, '%Y-%m-%d').date()
            except ValueError:
                print_date = None
        context['print_date'] = print_date

        if start_date and end_date and start_date == end_date:
            context['date_label'] = start_date
        elif start_date and end_date:
            context['date_label'] = f"{start_date} — {end_date}"
        elif start_date:
            context['date_label'] = f"c {start_date}"
        elif end_date:
            context['date_label'] = f"по {end_date}"
        else:
            context['date_label'] = ''

        return context


# Вьюха детального вида и редактирования
class ItemUpdateView(LoginRequiredMixin, UpdateView):
    model = Item
    template_name = 'shiftflow/item_detail.html'
    # Перечисляем поля, которые можно редактировать в сменке
    fields = [
        'machine', 'quantity_plan', 'quantity_fact', 
        'status', 'is_synced_1c', 
        'material_taken', 'usable_waste', 'scrap_weight'
    ]
    context_object_name = 'item'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        profile = getattr(self.request.user, 'profile', None)
        role = profile.role if profile else ('admin' if self.request.user.is_superuser else 'operator')
        context['user_role'] = role
        context['machines'] = Machine.objects.all()
        return context

    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        profile = getattr(request.user, 'profile', None)
        role = profile.role if profile else ('admin' if request.user.is_superuser else 'operator')

        if role in ['admin', 'technologist']:
            machine_id = request.POST.get('machine')
            if machine_id and machine_id.isdigit():
                self.object.machine_id = int(machine_id)

            date_value = request.POST.get('date')
            if date_value:
                self.object.date = date_value

            quantity_plan = request.POST.get('quantity_plan')
            if quantity_plan and quantity_plan.isdigit():
                self.object.quantity_plan = int(quantity_plan)

            quantity_fact = request.POST.get('quantity_fact')
            if quantity_fact and quantity_fact.isdigit():
                self.object.quantity_fact = int(quantity_fact)

            status = request.POST.get('status')
            allowed_statuses = {k for k, _ in self.object.STATUS_CHOICES}
            if status in allowed_statuses:
                self.object.status = status

            self.object.is_synced_1c = bool(request.POST.get('is_synced_1c'))
            self.object.material_taken = request.POST.get('material_taken', self.object.material_taken)
            self.object.usable_waste = request.POST.get('usable_waste', self.object.usable_waste)

            scrap_weight = request.POST.get('scrap_weight')
            if scrap_weight is not None and scrap_weight != '':
                try:
                    self.object.scrap_weight = float(scrap_weight)
                except ValueError:
                    pass

            self.object.save()
            return redirect('registry')

        if role in ['operator', 'master']:
            if self.object.status != 'work':
                return redirect('registry')

            material_taken = (request.POST.get('material_taken') or '').strip()
            usable_waste = (request.POST.get('usable_waste') or '').strip()
            scrap_weight_raw = (request.POST.get('scrap_weight') or '').strip()

            errors = []
            if not material_taken:
                errors.append('Заполни поле "Взятый материал"')
            if not usable_waste:
                errors.append('Заполни поле "Остаток ДО"')
            if scrap_weight_raw == '':
                errors.append('Заполни поле "Лом (кг)" (можно 0)')

            scrap_weight = None
            if scrap_weight_raw != '':
                try:
                    scrap_weight = float(scrap_weight_raw)
                except ValueError:
                    errors.append('Поле "Лом (кг)" должно быть числом')

            status = request.POST.get('status', self.object.status)

            if errors:
                context = self.get_context_data()
                context['errors'] = errors
                return self.render_to_response(context)

            self.object.material_taken = material_taken
            self.object.usable_waste = usable_waste
            if scrap_weight is not None:
                self.object.scrap_weight = scrap_weight

            if status == 'done':
                self.object.quantity_fact = self.object.quantity_plan
                self.object.status = 'done'
                self.object.save()
                return redirect('registry')

            if status == 'partial':
                try:
                    fact = int(request.POST.get('quantity_fact', '0'))
                except ValueError:
                    fact = 0
                if fact <= 0:
                    context = self.get_context_data()
                    context['errors'] = ['При частичном закрытии укажи, сколько сделано (больше 0)']
                    return self.render_to_response(context)
                fact = max(0, min(fact, self.object.quantity_plan))
                residual = self.object.quantity_plan - fact

                self.object.quantity_fact = fact
                self.object.status = 'partial'
                self.object.save()

                if residual > 0:
                    Item.objects.create(
                        task=self.object.task,
                        date=self.object.date,
                        machine=self.object.machine,
                        quantity_plan=residual,
                        quantity_fact=0,
                        status='leftover',
                        is_synced_1c=False,
                    )

                return redirect('registry')

            return redirect('registry')

        if role == 'clerk':
            if self.object.status not in ['done', 'partial']:
                return redirect('registry')
            self.object.is_synced_1c = bool(request.POST.get('is_synced_1c'))
            self.object.save(update_fields=['is_synced_1c'])
            return redirect('registry')

        return redirect('registry')

    def get_success_url(self):
        return reverse_lazy('registry')