feat: update service report exports and calendar bulk downloads

Align service-record PDF/DOCX generation with task-level data and naming.

- Use Task.service_report_note as report note source
- Use Task.scheduled_date for service-record dates
- Rename per-task exports to MT...SN... format
- Add monthly SN/PN ZIP download endpoints with 7-day retention
- Add calendar 'Preuzmi sve' modal with both bulk download actions
- Prefill work-hours day/date from scheduled_date for empty tables
- Remove duplicate note table and clean extra DOCX page breaks

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/modules/fleet/views.py

@@ -6,6 +6,7 @@ import base64
 import csv
 import mimetypes
 import threading
+import zipfile
 import re
 from collections import OrderedDict
 from datetime import timedelta
@@ -183,6 +184,7 @@ def _parse_format(value):
 
 
 GENERATED_PDF_TTL_HOURS = 24
+GENERATED_ARCHIVE_TTL_DAYS = 7
 
 
 def _work_order_display_code(work_order):
@@ -192,6 +194,17 @@ def _work_order_display_code(work_order):
     return 'NALOG'
 
 
+def _sanitize_task_title_for_filename(value):
+    normalized = re.sub(r'\s+', '_', str(value or '').strip())
+    normalized = re.sub(r'[^A-Za-z0-9_-]+', '', normalized)
+    normalized = normalized.strip('._-')
+    return normalized or 'servisni_zapis'
+
+
+def _service_task_filename_label(task):
+    return f"SN-{_sanitize_task_title_for_filename(getattr(task, 'title', ''))}"
+
+
 def _pdf_filename(work_order, pdf_type):
     display_code = _work_order_display_code(work_order)
     if pdf_type == 'invoices':
@@ -214,14 +227,14 @@ def _service_records_pdf_filename(work_order, task=None):
     if not task:
         return _pdf_filename(work_order, 'service_records')
     display_code = _work_order_display_code(work_order)
-    return f"{display_code}.task-{task.pk}.work-order-service-records.pdf"
+    return f"{display_code}.{_service_task_filename_label(task)}.pdf"
 
 
 def _service_records_docx_filename(work_order, task=None):
     if not task:
         return _docx_filename(work_order, 'service_records')
     display_code = _work_order_display_code(work_order)
-    return f"{display_code}.task-{task.pk}.work-order-service-records.docx"
+    return f"{display_code}.{_service_task_filename_label(task)}.docx"
 
 
 def _resolve_service_report_tasks(work_order, task_id):
@@ -941,13 +954,13 @@ def _build_work_order_service_records_pdf(work_order, related_tasks=None):
         .prefetch_related('photos')
         .order_by('service_date', 'created_at')
     )
-    # Per-task notes; fall back to work_order.notes
+    # Per-task notes from Task.service_report_note (edited via "Uredi tekst napomene")
     task_note_parts = [
         str(task.service_report_note or '').strip()
         for task in related_tasks
         if str(task.service_report_note or '').strip()
     ]
-    notes_text = "\n".join(task_note_parts) if task_note_parts else str(work_order.notes or '').strip()
+    notes_text = "\n".join(task_note_parts) if task_note_parts else '-'
 
     buffer = BytesIO()
 
@@ -1387,8 +1400,9 @@ def _build_service_record_pdf(service_record):
     y = content_top - 6
     y -= 6
 
+    task_scheduled_date = getattr(task, 'scheduled_date', None) if task else None
     info_rows = [
-        ["ID", str(service_record.pk), "Datum", _fmt_date(service_record.service_date)],
+        ["ID", str(service_record.pk), "Datum", _fmt_date(task_scheduled_date)],
         ["Naziv", service_record.service_title or '-', "Servisni zadatak", getattr(task, 'title', '-') or '-'],
         ["Dizalica", getattr(vehicle, 'registration_number', '-') or '-', "SN", getattr(vehicle, 'crane_serial_number', '-') or '-'],
         ["Serviser", _user_display_name(service_record.performed_by) or '-', "KM", str(service_record.mileage or '-')],
@@ -1704,6 +1718,12 @@ def _docx_remove_rows_after(table, keep_rows=1):
         table._tbl.remove(row._tr)
 
 
+def _docx_remove_table(table):
+    parent = table._tbl.getparent()
+    if parent is not None:
+        parent.remove(table._tbl)
+
+
 def _docx_move_table_after_paragraph_text(document, table, marker_text):
     if not marker_text:
         return False
@@ -1745,11 +1765,15 @@ def _extract_unique_parts_entries(records):
         if match:
             serial = _normalize_whitespace(match.group(1)) or '-'
             description = _normalize_whitespace(match.group(2)) or '-'
+        related_task = getattr(record, 'task', None)
+        changed_at_value = '-'
+        if related_task and getattr(related_task, 'scheduled_date', None):
+            changed_at_value = related_task.scheduled_date.strftime('%d.%m.%Y')
         unique[key] = {
             'serial': serial,
             'description': description,
             'note': '-',
-            'changed_at': record.service_date.strftime('%d.%m.%Y') if record.service_date else '-',
+            'changed_at': changed_at_value,
         }
     return list(unique.values())
 
@@ -1791,6 +1815,27 @@ def _docx_cleanup_service_report_template(document):
             body.remove(element)
 
 
+def _docx_remove_empty_page_break_paragraphs(document):
+    body = document._body._element
+    paragraph_namespace = '{http://schemas.openxmlformats.org/wordprocessingml/2006/main}p'
+    break_namespace = '{http://schemas.openxmlformats.org/wordprocessingml/2006/main}br'
+    text_namespace = '{http://schemas.openxmlformats.org/wordprocessingml/2006/main}t'
+    wordprocessing_namespace = 'http://schemas.openxmlformats.org/wordprocessingml/2006/main'
+
+    for element in list(body):
+        if element.tag != paragraph_namespace:
+            continue
+        text = ''.join(node.text or '' for node in element.iter(text_namespace)).strip()
+        if text:
+            continue
+        has_page_break = any(
+            br.tag == break_namespace and br.get(f'{{{wordprocessing_namespace}}}type') == 'page'
+            for br in element.iter(break_namespace)
+        )
+        if has_page_break:
+            body.remove(element)
+
+
 def _build_work_order_docx_bytes(work_order):
     vehicle = work_order.vehicle
     creator = work_order.creator
@@ -1903,15 +1948,15 @@ def _build_work_order_service_records_docx_bytes(work_order, related_tasks=None)
         for task in related_tasks
     }
 
-    # Build notes: use per-task service_report_note; fall back to work_order.notes
+    # Build notes only from per-task service_report_note (edited via "Uredi tekst napomene")
     task_note_parts = [
         str(task.service_report_note or '').strip()
         for task in related_tasks
         if str(task.service_report_note or '').strip()
     ]
-    notes_text = "\n".join(task_note_parts) if task_note_parts else (str(work_order.notes or '').strip() or '-')
+    notes_text = "\n".join(task_note_parts) if task_note_parts else '-'
 
-    if len(doc.tables) >= 4:
+    if len(doc.tables) >= 3:
         info_table = doc.tables[0]
         _set_docx_cell_text(info_table, 1, 0, client_name)
         _set_docx_cell_text(info_table, 1, 1, work_order.location or '-')
@@ -1941,20 +1986,8 @@ def _build_work_order_service_records_docx_bytes(work_order, related_tasks=None)
             target_row.cells[1].text = entry['description']
             target_row.cells[2].text = entry['note']
             target_row.cells[3].text = entry['changed_at']
-
-        details_table = doc.tables[3]
-        repair_lines = []
-        for task in related_tasks:
-            task_records = records_by_task.get(task.id, [])
-            if not task_records:
-                continue
-            repair_lines.append(f"Zadatak: {task.title or f'Servisni zadatak #{task.id}'}")
-            for record in task_records:
-                description = str(record.description or '-').strip() or '-'
-                repair_lines.append(f"- {description}")
-        repair_text = "\n".join(repair_lines) if repair_lines else '-'
-        _set_docx_cell_text(details_table, 0, 0, f"Kvar: {notes_text}")
-        _set_docx_cell_text(details_table, 1, 0, f"Popravak: {repair_text}")
+        if len(doc.tables) > 3:
+            _docx_remove_table(doc.tables[3])
     else:
         raise DRFValidationError({"detail": "DOCX template ima neočekivanu strukturu (nedostaju tablice)."})
 
@@ -1997,6 +2030,7 @@ def _build_work_order_service_records_docx_bytes(work_order, related_tasks=None)
             cells[index].text = '-'
     _docx_move_table_after_paragraph_text(doc, hours_table, 'Tablica radnih sati')
     _docx_cleanup_service_report_template(doc)
+    _docx_remove_empty_page_break_paragraphs(doc)
     doc.add_page_break()
     _docx_add_heading(doc, 'Servisni zapisi', level=2)
 
@@ -2006,9 +2040,10 @@ def _build_work_order_service_records_docx_bytes(work_order, related_tasks=None)
         if not task_records:
             continue
         has_records = True
+        task_date_label = task.scheduled_date.strftime('%d.%m.%Y') if task.scheduled_date else '-'
         _docx_add_heading(doc, task.title or f"Servisni zadatak #{task.id}", level=3)
         for record in task_records:
-            doc.add_paragraph(f"Datum: {record.service_date or '-'}")
+            doc.add_paragraph(f"Datum: {task_date_label}")
             doc.add_paragraph(f"Opis: {record.description or '-'}")
             doc.add_paragraph(f"Korišteni dijelovi: {record.parts or '-'}")
             doc.add_paragraph(f"Trošak: {record.cost or '-'} EUR")
@@ -2635,6 +2670,185 @@ def monthly_costs_report_docx(request):
     return resp
 
 
+def _monthly_archive_prefix_for_user(user):
+    first_name = str(getattr(user, 'first_name', '') or '').strip()
+    last_name = str(getattr(user, 'last_name', '') or '').strip()
+    if first_name and last_name:
+        return f"{first_name[0].upper()}{last_name[0].upper()}"
+    return 'MT'
+
+
+def _generated_archives_dir():
+    root = Path(settings.MEDIA_ROOT) / 'fleet' / 'generated_archives'
+    root.mkdir(parents=True, exist_ok=True)
+    return root
+
+
+def _cleanup_expired_generated_archives():
+    root = _generated_archives_dir()
+    threshold = timezone.now() - timedelta(days=GENERATED_ARCHIVE_TTL_DAYS)
+    threshold_ts = threshold.timestamp()
+    for candidate in root.glob('*.zip'):
+        try:
+            if candidate.stat().st_mtime <= threshold_ts:
+                candidate.unlink(missing_ok=True)
+        except OSError:
+            continue
+
+
+def _persist_generated_archive(filename, content):
+    root = _generated_archives_dir()
+    timestamp = timezone.now().strftime('%Y%m%d%H%M%S')
+    stored_name = f"{timestamp}-{Path(filename).name}"
+    target = root / stored_name
+    with target.open('wb') as handle:
+        handle.write(content)
+    return target
+
+
+def _unique_zip_entry_name(entry_name, used_names):
+    candidate = entry_name
+    entry_path = Path(entry_name)
+    stem = entry_path.stem
+    suffix = entry_path.suffix
+    parent = str(entry_path.parent)
+    counter = 2
+    while candidate in used_names:
+        filename = f"{stem}-{counter}{suffix}"
+        candidate = f"{parent}/{filename}" if parent not in ('', '.') else filename
+        counter += 1
+    used_names.add(candidate)
+    return candidate
+
+
+@api_view(['GET'])
+@permission_classes([permissions.IsAuthenticated])
+def monthly_service_tasks_archive(request):
+    from datetime import date as _dt_date
+    from modules.task_management.models import Task
+
+    try:
+        year = int(request.query_params.get('year', _dt_date.today().year))
+        month = int(request.query_params.get('month', _dt_date.today().month))
+        if not (1 <= month <= 12):
+            raise ValueError()
+    except (ValueError, TypeError):
+        return Response({'detail': 'Nevažeći year/month parametar.'}, status=400)
+
+    tasks = list(
+        Task.objects
+        .filter(
+            assigned_to=request.user,
+            is_active=True,
+            scheduled_date__year=year,
+            scheduled_date__month=month,
+            work_order__isnull=False,
+            work_order__is_active=True,
+        )
+        .select_related('work_order', 'vehicle', 'work_hours_table')
+        .order_by('scheduled_date', 'created_at')
+    )
+    if not tasks:
+        return Response({'detail': 'Nema servisnih taskova za odabrani mjesec.'}, status=404)
+
+    used_names = set()
+    archive_buffer = BytesIO()
+    with zipfile.ZipFile(archive_buffer, mode='w', compression=zipfile.ZIP_DEFLATED) as archive:
+        for task in tasks:
+            work_order = task.work_order
+            if work_order is None:
+                continue
+            docx_bytes = _build_work_order_service_records_docx_bytes(work_order, related_tasks=[task])
+            base_name = _service_records_docx_filename(work_order, task)
+            entry_name = _unique_zip_entry_name(base_name, used_names)
+            archive.writestr(entry_name, docx_bytes)
+
+    archive_content = archive_buffer.getvalue()
+    if not archive_content:
+        return Response({'detail': 'Nije moguće kreirati ZIP za odabrani mjesec.'}, status=400)
+
+    prefix = _monthly_archive_prefix_for_user(request.user)
+    archive_filename = f"{prefix}-{month:02d}-{year}-SN.zip"
+    _cleanup_expired_generated_archives()
+    _persist_generated_archive(archive_filename, archive_content)
+
+    response = HttpResponse(archive_content, content_type='application/zip')
+    response['Content-Disposition'] = f'attachment; filename="{archive_filename}"'
+    return response
+
+
+@api_view(['GET'])
+@permission_classes([permissions.IsAuthenticated])
+def monthly_work_orders_archive(request):
+    from datetime import date as _dt_date
+    from modules.task_management.models import Task
+
+    try:
+        year = int(request.query_params.get('year', _dt_date.today().year))
+        month = int(request.query_params.get('month', _dt_date.today().month))
+        if not (1 <= month <= 12):
+            raise ValueError()
+    except (ValueError, TypeError):
+        return Response({'detail': 'Nevažeći year/month parametar.'}, status=400)
+
+    monthly_tasks = (
+        Task.objects
+        .filter(
+            assigned_to=request.user,
+            is_active=True,
+            scheduled_date__year=year,
+            scheduled_date__month=month,
+            work_order__isnull=False,
+            work_order__is_active=True,
+        )
+        .select_related('work_order')
+        .order_by('scheduled_date', 'created_at')
+    )
+    work_order_ids = [task.work_order_id for task in monthly_tasks if task.work_order_id]
+    if not work_order_ids:
+        return Response({'detail': 'Nema putnih naloga za odabrani mjesec.'}, status=404)
+
+    work_orders = list(
+        WorkOrder.objects
+        .filter(id__in=work_order_ids, is_active=True)
+        .select_related('vehicle', 'vehicle__client', 'creator')
+        .distinct()
+    )
+    if not work_orders:
+        return Response({'detail': 'Nema putnih naloga za odabrani mjesec.'}, status=404)
+
+    used_names = set()
+    archive_buffer = BytesIO()
+    with zipfile.ZipFile(archive_buffer, mode='w', compression=zipfile.ZIP_DEFLATED) as archive:
+        for work_order in work_orders:
+            pdf_bytes = _build_work_order_pdf(work_order)
+            work_order_pdf_name = _unique_zip_entry_name(_pdf_filename(work_order, 'work_order'), used_names)
+            archive.writestr(work_order_pdf_name, pdf_bytes)
+
+            display_code = _work_order_display_code(work_order)
+            invoices = work_order.invoices.filter(is_active=True).order_by('datum', 'created_at')
+            for index, invoice in enumerate(invoices, start=1):
+                attachment = _file_attachment(invoice.image, fallback_name=f"invoice-{index}.bin")
+                if not attachment:
+                    continue
+                invoice_filename, content, _content_type = attachment
+                archive_path = f"Racuni/{display_code}/{invoice_filename}"
+                archive.writestr(_unique_zip_entry_name(archive_path, used_names), content)
+
+    archive_content = archive_buffer.getvalue()
+    if not archive_content:
+        return Response({'detail': 'Nije moguće kreirati ZIP za odabrani mjesec.'}, status=400)
+
+    prefix = _monthly_archive_prefix_for_user(request.user)
+    archive_filename = f"{prefix}-{month:02d}-{year}-PN.zip"
+    _cleanup_expired_generated_archives()
+    _persist_generated_archive(archive_filename, archive_content)
+
+    response = HttpResponse(archive_content, content_type='application/zip')
+    response['Content-Disposition'] = f'attachment; filename="{archive_filename}"'
+    return response
+
+
 @api_view(['POST'])
 @permission_classes([permissions.IsAuthenticated])
 def pusher_auth(request):
@@ -3013,6 +3227,7 @@ class WorkOrderViewSet(viewsets.ModelViewSet):
                 'title': task.title,
                 'status': task.status,
                 'description': task.description,
+                'scheduled_date': task.scheduled_date,
                 'service_report_note': task.service_report_note or '',
                 'assigned_to_name': _user_display_name(task.assigned_to),
                 'vehicle_registration': getattr(task.vehicle, 'registration_number', None),