ACORE/apps/it_manager/views.py

from datetime import datetime

from django.contrib.auth import get_user_model
from django.contrib.auth.decorators import login_required
from django.db import models
from django.db.models import Q, Sum
from django.http import HttpResponseForbidden
from django.shortcuts import get_object_or_404
from django.utils import timezone

from apps.it_manager.models import (
    Consumable, Equipment, EquipmentAssignment, EquipmentModel,
    InternetContract, InternetProvider,
    ServiceCall, Ticket, TicketComment, WorkLog,
)
from apps.locations.models.base import Location
from core.models.directories import Directory
from core.utils.htmx import render_page
from core.utils.pagination import paginate

Employee = get_user_model()


def _is_it_staff(user):
    from core.portal_access import user_can_access
    return user_can_access(user, 'it_manager')


def _it_assignees():
    """Кандидаты в исполнители: группа IT, а также staff/superuser
    (если в группу IT ещё никого не добавили — селект не пустой)."""
    return (
        Employee.objects.filter(is_active=True)
        .filter(Q(groups__name='IT') | Q(is_staff=True) | Q(is_superuser=True))
        .distinct()
        .order_by('last_name', 'first_name')
    )

def _directory_choices(type_code):
    """(code, name)-кортежі активних записів довідника — та сама форма,
    що й колишні CharField(choices=...), для сумісності з шаблонами."""
    return list(
        Directory.objects.filter(directory_type__code=type_code, is_active=True)
        .order_by('name').values_list('code', 'name')
    )


def _resolve_directory(type_code, code):
    """Резолвить код у Directory.pk для запису у FK-поле з форми (POST шле код,
    не pk — так шаблони лишаються незмінними)."""
    if not code:
        return None
    return Directory.objects.filter(directory_type__code=type_code, code=code).values_list('id', flat=True).first()


def _it_manager_context(request):
    equipment_qs = (
        Equipment.objects.select_related(
            'equipment_model__brand', 'equipment_model__equipment_type',
            'assigned_to', 'location', 'status',
        )
        .order_by('equipment_model__equipment_type__name', 'equipment_model__name', 'serial_number')
    )
    equipment = list(equipment_qs)
    equipment_statuses = _directory_choices('equipment_status')
    equipment_counts = {code: 0 for code, _ in equipment_statuses}
    for item in equipment:
        equipment_counts[item.status.code] = equipment_counts.get(item.status.code, 0) + 1
    equipment_page = paginate(request, equipment_qs, page_param='equipment_page', size_param='equipment_per_page')

    equipment_models = list(
        EquipmentModel.objects.select_related('equipment_type', 'brand')
        .annotate(units_total=models.Count('units'))
        .order_by('equipment_type__name', 'brand__name', 'name')
    )

    tickets_qs = (
        Ticket.objects.select_related('requester', 'assignee', 'equipment', 'ticket_type', 'priority', 'status')
        .prefetch_related('comments__author')
        .order_by('-created_at')
    )
    tickets = list(tickets_qs)
    ticket_statuses = _directory_choices('ticket_status')
    ticket_counts = {code: 0 for code, _ in ticket_statuses}
    for ticket in tickets:
        ticket_counts[ticket.status.code] = ticket_counts.get(ticket.status.code, 0) + 1
    ticket_overdue_count = sum(1 for t in tickets if t.is_overdue)
    tickets_page = paginate(request, tickets_qs, page_param='tickets_page', size_param='tickets_per_page')

    month_start = timezone.localdate().replace(day=1)
    worklogs_qs = (
        WorkLog.objects.select_related('technician', 'location', 'equipment', 'ticket', 'work_type')
        .order_by('-date', '-created_at')
    )
    worklogs_page = paginate(request, worklogs_qs, page_param='worklogs_page', size_param='worklogs_per_page')
    month_hours = WorkLog.objects.filter(date__gte=month_start).aggregate(total=Sum('hours_spent'))['total'] or 0
    month_count = WorkLog.objects.filter(date__gte=month_start).count()

    consumables_qs = (
        Consumable.objects.select_related('consumable_type', 'color', 'status', 'equipment', 'location')
        .order_by('equipment', 'consumable_type__name', 'color__name')
    )
    consumables = list(consumables_qs)
    consumable_low_count = sum(1 for c in consumables if c.is_low)
    consumables_page = paginate(request, consumables_qs, page_param='consumables_page', size_param='consumables_per_page')
    printers = [e for e in equipment if e.equipment_type.code == 'printer']

    providers = list(InternetProvider.objects.order_by('name'))

    contracts_qs = (
        InternetContract.objects.select_related('provider', 'location', 'service_type', 'connection_type', 'status')
        .order_by('location__address', 'provider__name')
    )
    contracts = list(contracts_qs)
    contracts_expiring_count = sum(1 for c in contracts if c.is_expiring_soon)
    contracts_page = paginate(request, contracts_qs, page_param='contracts_page', size_param='contracts_per_page')

    service_calls_qs = (
        ServiceCall.objects.select_related('caller', 'handler', 'location', 'channel', 'ticket')
        .order_by('-date_time')
    )
    service_calls_page = paginate(
        request, service_calls_qs, page_param='servicecalls_page', size_param='servicecalls_per_page',
    )
    service_calls_count = service_calls_qs.count()

    return {
        'equipment_list': equipment,
        'equipment_page': equipment_page,
        'equipment_counts': equipment_counts,
        'equipment_types': _directory_choices('equipment_type'),
        'equipment_statuses': equipment_statuses,
        'equipment_brands': Directory.objects.filter(directory_type__code='equipment_brand', is_active=True).order_by('name'),
        'equipment_models': equipment_models,
        'it_locations': (
            Location.objects.filter(is_active=True)
            .select_related('location_region')
            .prefetch_related('pharmacy')
            .order_by('location_type', 'address')
        ),
        'it_employees': Employee.objects.filter(is_active=True).order_by('last_name', 'first_name'),

        'tickets': tickets,
        'tickets_page': tickets_page,
        'ticket_counts': ticket_counts,
        'ticket_overdue_count': ticket_overdue_count,
        'ticket_statuses': ticket_statuses,
        'ticket_priorities': _directory_choices('ticket_priority'),
        'ticket_types': _directory_choices('ticket_type'),
        'it_staff': _it_assignees(),

        'worklogs_page': worklogs_page,
        'worklog_types': _directory_choices('worklog_type'),
        'month_hours': month_hours,
        'month_count': month_count,

        'consumables_page': consumables_page,
        'consumables_count': len(consumables),
        'consumable_low_count': consumable_low_count,
        'consumable_types': _directory_choices('consumable_type'),
        'consumable_colors': _directory_choices('consumable_color'),
        'consumable_statuses': _directory_choices('consumable_status'),
        'printers': printers,

        'providers': providers,
        'contracts_page': contracts_page,
        'contracts_count': len(contracts),
        'contracts_expiring_count': contracts_expiring_count,
        'contract_service_types': _directory_choices('contract_service_type'),
        'contract_connection_types': _directory_choices('contract_connection_type'),
        'contract_statuses': _directory_choices('contract_status'),

        'service_calls_page': service_calls_page,
        'service_calls_count': service_calls_count,
        'servicecall_channels': _directory_choices('servicecall_channel'),
    }


@login_required
def it_manager_view(request):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()
    return render_page(request, 'it-manager.html', _it_manager_context(request))


@login_required
def equipment_model_create_view(request):
    """Додати модель у каталог (тип + бренд + назва). Далі за нею
    заводяться екземпляри лише з серійниками."""
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    context_extra = {}
    if request.method == 'POST':
        equipment_type_id = _resolve_directory('equipment_type', request.POST.get('equipment_type', ''))
        name = request.POST.get('name', '').strip()
        if equipment_type_id and name:
            warranty_months = request.POST.get('warranty_months', '').strip()
            EquipmentModel.objects.get_or_create(
                equipment_type_id=equipment_type_id,
                brand_id=request.POST.get('brand_id') or None,
                name=name,
                defaults={
                    'warranty_months': int(warranty_months) if warranty_months.isdigit() else None,
                    'notes': request.POST.get('notes', '').strip(),
                },
            )
        else:
            context_extra['equipment_form_error'] = 'Вкажіть тип і назву моделі.'

    context = _it_manager_context(request)
    context['it_active_tab'] = 'equipment'
    context.update(context_extra)
    return render_page(request, 'it-manager.html', context)


@login_required
def equipment_bulk_create_view(request):
    """Масовий ввід екземплярів: обираємо модель з каталогу і вставляємо
    список серійників (по одному в рядку) — створюється N одиниць на склад.
    Так більше не треба щоразу переписувати тип/бренд/модель."""
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    context_extra = {}
    if request.method == 'POST':
        model_id = request.POST.get('equipment_model_id') or None
        raw_serials = request.POST.get('serial_numbers', '')
        # серійники — по одному в рядку (або через кому); чистимо й дедуплікуємо
        serials, seen = [], set()
        for chunk in raw_serials.replace(',', '\n').splitlines():
            s = chunk.strip()
            if s and s not in seen:
                seen.add(s)
                serials.append(s)

        model = EquipmentModel.objects.filter(pk=model_id).first() if model_id else None
        if not model:
            context_extra['equipment_form_error'] = 'Оберіть модель з каталогу.'
        elif not serials:
            context_extra['equipment_form_error'] = 'Вставте хоча б один серійний номер.'
        else:
            purchase_date = request.POST.get('purchase_date') or None
            warranty_until = request.POST.get('warranty_until') or None
            # авто-розрахунок гарантії від дати покупки, якщо в моделі є термін
            if purchase_date and not warranty_until and model.warranty_months:
                try:
                    d = datetime.strptime(purchase_date, '%Y-%m-%d').date()
                    month = d.month - 1 + model.warranty_months
                    year = d.year + month // 12
                    from calendar import monthrange
                    day = min(d.day, monthrange(year, month % 12 + 1)[1])
                    warranty_until = d.replace(year=year, month=month % 12 + 1, day=day)
                except ValueError:
                    warranty_until = None
            location_id = request.POST.get('location_id') or None
            # якщо одразу видаємо на локацію — статус assigned, інакше stock
            status_code = 'assigned' if location_id else 'stock'
            status_id = _resolve_directory('equipment_status', status_code) \
                or _resolve_directory('equipment_status', 'stock')

            existing = set(
                Equipment.objects.filter(serial_number__in=serials)
                .values_list('serial_number', flat=True)
            )
            created = 0
            for s in serials:
                if s in existing:
                    continue
                Equipment.objects.create(
                    equipment_model=model,
                    serial_number=s,
                    status_id=status_id,
                    location_id=location_id,
                    purchase_date=purchase_date,
                    warranty_until=warranty_until,
                )
                created += 1
            skipped = len(serials) - created
            msg = f'Додано {created} од. «{model}»'
            if skipped:
                msg += f'; пропущено {skipped} (серійник вже існує)'
            context_extra['equipment_form_message'] = msg

    context = _it_manager_context(request)
    context['it_active_tab'] = 'equipment'
    context.update(context_extra)
    return render_page(request, 'it-manager.html', context)


@login_required
def equipment_bulk_assign_view(request):
    """Масова видача: відмічені екземпляри → локація (та/або співробітник)
    за один крок, з записом у історію переміщень."""
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    context_extra = {}
    if request.method == 'POST':
        ids = request.POST.getlist('equipment_ids')
        location_id = request.POST.get('location_id') or None
        assigned_to_id = request.POST.get('assigned_to_id') or None

        if not ids:
            context_extra['equipment_form_error'] = 'Відмітьте хоча б один екземпляр.'
        elif not location_id and not assigned_to_id:
            context_extra['equipment_form_error'] = 'Оберіть локацію або співробітника для видачі.'
        else:
            assigned_status_id = _resolve_directory('equipment_status', 'assigned')
            units = Equipment.objects.filter(pk__in=ids)
            count = 0
            for unit in units:
                # закриваємо попередню активну видачу, якщо була
                if unit.assigned_to_id:
                    EquipmentAssignment.objects.filter(
                        equipment=unit, assigned_to_id=unit.assigned_to_id, returned_at__isnull=True,
                    ).update(returned_at=timezone.now())
                if location_id:
                    unit.location_id = location_id
                if assigned_to_id:
                    unit.assigned_to_id = assigned_to_id
                if assigned_status_id:
                    unit.status_id = assigned_status_id
                unit.save()
                EquipmentAssignment.objects.create(
                    equipment=unit,
                    assigned_to_id=assigned_to_id,
                    location_id=location_id,
                    assigned_by=request.user,
                )
                count += 1
            context_extra['equipment_form_message'] = f'Видано {count} од. обладнання'

    context = _it_manager_context(request)
    context['it_active_tab'] = 'equipment'
    context.update(context_extra)
    return render_page(request, 'it-manager.html', context)


@login_required
def equipment_update_view(request, pk):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        equipment = get_object_or_404(Equipment, pk=pk)

        new_status_id = _resolve_directory('equipment_status', request.POST.get('status'))
        if new_status_id:
            equipment.status_id = new_status_id

        new_assigned_to = request.POST.get('assigned_to_id') or None
        if str(equipment.assigned_to_id or '') != str(new_assigned_to or ''):
            if equipment.assigned_to_id:
                EquipmentAssignment.objects.filter(
                    equipment=equipment, assigned_to_id=equipment.assigned_to_id, returned_at__isnull=True,
                ).update(returned_at=timezone.now())
            equipment.assigned_to_id = new_assigned_to
            if new_assigned_to:
                EquipmentAssignment.objects.create(
                    equipment=equipment, assigned_to_id=new_assigned_to,
                    location=equipment.location, assigned_by=request.user,
                )

        equipment.save()

    context = _it_manager_context(request)
    context['it_active_tab'] = 'equipment'
    return render_page(request, 'it-manager.html', context)


@login_required
def ticket_update_view(request, pk):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        ticket = get_object_or_404(Ticket, pk=pk)

        new_status_id = _resolve_directory('ticket_status', request.POST.get('status'))
        if new_status_id:
            ticket.status_id = new_status_id

        ticket.assignee_id = request.POST.get('assignee_id') or None
        ticket.save()

    context = _it_manager_context(request)
    context['it_active_tab'] = 'tickets'
    return render_page(request, 'it-manager.html', context)


@login_required
def ticket_comment_view(request, pk):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        ticket = get_object_or_404(Ticket, pk=pk)
        text = request.POST.get('text', '').strip()
        if text:
            TicketComment.objects.create(
                ticket=ticket, author=request.user, text=text,
                is_internal=bool(request.POST.get('is_internal')),
            )

    context = _it_manager_context(request)
    context['it_active_tab'] = 'tickets'
    return render_page(request, 'it-manager.html', context)


@login_required
def worklog_create_view(request):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        description = request.POST.get('description', '').strip()
        work_type_id = _resolve_directory('worklog_type', request.POST.get('work_type', ''))

        if description and work_type_id:
            try:
                log_date = datetime.strptime(request.POST.get('date', ''), '%Y-%m-%d').date()
            except ValueError:
                log_date = timezone.localdate()
            try:
                hours_spent = float(request.POST.get('hours_spent', '').strip() or 0) or None
            except ValueError:
                hours_spent = None

            WorkLog.objects.create(
                date=log_date,
                technician=request.user,
                work_type_id=work_type_id,
                location_id=request.POST.get('location_id') or None,
                equipment_id=request.POST.get('equipment_id') or None,
                ticket_id=request.POST.get('ticket_id') or None,
                description=description,
                result=request.POST.get('result', '').strip(),
                hours_spent=hours_spent,
            )

    context = _it_manager_context(request)
    context['it_active_tab'] = 'worklog'
    return render_page(request, 'it-manager.html', context)


@login_required
def consumable_create_view(request):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        model_number = request.POST.get('model_number', '').strip()
        consumable_type_id = _resolve_directory('consumable_type', request.POST.get('consumable_type', ''))
        color_id = _resolve_directory('consumable_color', request.POST.get('color', ''))

        if model_number and consumable_type_id and color_id:
            Consumable.objects.create(
                consumable_type_id=consumable_type_id,
                brand=request.POST.get('brand', '').strip(),
                model_number=model_number,
                color_id=color_id,
                equipment_id=request.POST.get('equipment_id') or None,
                location_id=request.POST.get('location_id') or None,
                page_yield=request.POST.get('page_yield') or None,
                purchase_date=request.POST.get('purchase_date') or None,
                notes=request.POST.get('notes', '').strip(),
            )

    context = _it_manager_context(request)
    context['it_active_tab'] = 'consumables'
    return render_page(request, 'it-manager.html', context)


@login_required
def consumable_update_view(request, pk):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        consumable = get_object_or_404(Consumable, pk=pk)
        new_status_code = request.POST.get('status')
        new_status_id = _resolve_directory('consumable_status', new_status_code)
        if new_status_id:
            consumable.status_id = new_status_id
            if new_status_code == 'installed' and not consumable.installed_date:
                consumable.installed_date = timezone.localdate()
        consumable.save()

    context = _it_manager_context(request)
    context['it_active_tab'] = 'consumables'
    return render_page(request, 'it-manager.html', context)


@login_required
def provider_create_view(request):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        name = request.POST.get('name', '').strip()
        if name:
            InternetProvider.objects.get_or_create(
                name=name,
                defaults={
                    'phone': request.POST.get('phone', '').strip(),
                    'email': request.POST.get('email', '').strip(),
                    'website': request.POST.get('website', '').strip(),
                    'support_phone': request.POST.get('support_phone', '').strip(),
                    'support_email': request.POST.get('support_email', '').strip(),
                    'notes': request.POST.get('notes', '').strip(),
                },
            )

    context = _it_manager_context(request)
    context['it_active_tab'] = 'providers'
    return render_page(request, 'it-manager.html', context)


@login_required
def contract_create_view(request):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        provider_id = request.POST.get('provider_id') or None
        location_id = request.POST.get('location_id') or None
        contract_number = request.POST.get('contract_number', '').strip()
        start_date = request.POST.get('start_date') or None
        service_type_id = _resolve_directory('contract_service_type', request.POST.get('service_type', ''))

        if provider_id and location_id and contract_number and start_date and service_type_id:
            InternetContract.objects.create(
                provider_id=provider_id,
                location_id=location_id,
                contract_number=contract_number,
                service_type_id=service_type_id,
                connection_type_id=_resolve_directory('contract_connection_type', request.POST.get('connection_type', '')),
                start_date=start_date,
                end_date=request.POST.get('end_date') or None,
                monthly_cost=request.POST.get('monthly_cost') or None,
                bandwidth_down=request.POST.get('bandwidth_down') or None,
                bandwidth_up=request.POST.get('bandwidth_up') or None,
                account_number=request.POST.get('account_number', '').strip(),
                static_ips=request.POST.get('static_ips', '').strip() if request.POST.get('dedicated_ip') else '',
                notes=request.POST.get('notes', '').strip(),
            )

    context = _it_manager_context(request)
    context['it_active_tab'] = 'providers'
    return render_page(request, 'it-manager.html', context)


@login_required
def contract_update_view(request, pk):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        contract = get_object_or_404(InternetContract, pk=pk)
        new_status_id = _resolve_directory('contract_status', request.POST.get('status'))
        if new_status_id:
            contract.status_id = new_status_id
        contract.save()

    context = _it_manager_context(request)
    context['it_active_tab'] = 'providers'
    return render_page(request, 'it-manager.html', context)


@login_required
def servicecall_create_view(request):
    if not _is_it_staff(request.user):
        return HttpResponseForbidden()

    if request.method == 'POST':
        caller_id = request.POST.get('caller_id') or None
        description = request.POST.get('description', '').strip()
        channel_id = _resolve_directory('servicecall_channel', request.POST.get('channel', ''))

        if caller_id and description and channel_id:
            ServiceCall.objects.create(
                caller_id=caller_id,
                handler=request.user,
                channel_id=channel_id,
                location_id=request.POST.get('location_id') or None,
                description=description,
                resolution=request.POST.get('resolution', '').strip(),
                minutes_spent=request.POST.get('minutes_spent') or None,
                ticket_id=request.POST.get('ticket_id') or None,
            )

    context = _it_manager_context(request)
    context['it_active_tab'] = 'servicecalls'
    return render_page(request, 'it-manager.html', context)