complete first version of main proccess

certificates/views.py

@@ -0,0 +1,114 @@
+from django.shortcuts import render, get_object_or_404, redirect
+from django.contrib.auth.decorators import login_required
+from django.contrib import messages
+from django.http import JsonResponse
+from django.urls import reverse
+from django.utils import timezone
+
+from processes.models import ProcessInstance, StepInstance
+from invoices.models import Invoice
+from installations.models import InstallationReport
+from .models import CertificateTemplate, CertificateInstance
+
+from _helpers.jalali import Gregorian
+
+
+def _to_jalali(date_obj):
+    try:
+        g = Gregorian(date_obj)
+        y, m, d = g.persian_tuple()
+        return f"{y}/{m:02d}/{d:02d}"
+    except Exception:
+        return ''
+
+
+def _render_template(template: CertificateTemplate, instance: ProcessInstance):
+    well = instance.well
+    rep = instance.representative
+    latest_report = InstallationReport.objects.filter(assignment__process_instance=instance).order_by('-created').first()
+    ctx = {
+        'today_jalali': _to_jalali(timezone.now().date()),
+        'request_code': instance.code,
+        'company_name': (template.company.name if template.company else '') or '',
+        'customer_full_name': rep.get_full_name() if rep else '',
+        'water_subscription_number': getattr(well, 'water_subscription_number', '') or '',
+        'address': getattr(well, 'address', '') or '',
+        'visit_date_jalali': _to_jalali(getattr(latest_report, 'visited_date', None)) if latest_report else '',
+    }
+    title = (template.title or '').format(**ctx)
+    body = (template.body or '')
+    for k, v in ctx.items():
+        body = body.replace(f"{{{{ {k} }}}}", str(v))
+    return title, body
+
+
+@login_required
+def certificate_step(request, instance_id, step_id):
+    instance = get_object_or_404(ProcessInstance, id=instance_id)
+
+    # Ensure all previous steps are completed and invoice settled
+    prior_steps = instance.process.steps.filter(order__lt=instance.current_step.order if instance.current_step else 9999)
+    incomplete = StepInstance.objects.filter(process_instance=instance, step__in=prior_steps).exclude(status='completed').exists()
+    if incomplete:
+        messages.error(request, 'ابتدا همه مراحل قبلی را تکمیل کنید')
+        return redirect('processes:request_list')
+    inv = Invoice.objects.filter(process_instance=instance).first()
+    if inv:
+        inv.calculate_totals()
+        if inv.remaining_amount != 0:
+            messages.error(request, 'مانده فاکتور باید صفر باشد')
+            return redirect('processes:request_list')
+
+    template = CertificateTemplate.objects.filter(is_active=True).order_by('-created').first()
+    if not template:
+        return render(request, 'certificates/missing.html', {})
+
+    title, body = _render_template(template, instance)
+    cert, _ = CertificateInstance.objects.get_or_create(
+        process_instance=instance,
+        defaults={'template': template, 'rendered_title': title, 'rendered_body': body}
+    )
+    # keep rendered up-to-date
+    cert.template = template
+    cert.rendered_title = title
+    cert.rendered_body = body
+    cert.save()
+
+    previous_step = instance.process.steps.filter(order__lt=instance.current_step.order).last() if instance.current_step else None
+    next_step = instance.process.steps.filter(order__gt=instance.current_step.order).first() if instance.current_step else None
+
+    if request.method == 'POST':
+        cert.approved = True
+        cert.approved_at = timezone.now()
+        cert.save()
+        step_instance, _ = StepInstance.objects.get_or_create(process_instance=instance, step_id=step_id)
+        step_instance.status = 'completed'
+        step_instance.completed_at = timezone.now()
+        step_instance.save()
+        if next_step:
+            instance.current_step = next_step
+            instance.save()
+            return redirect('processes:step_detail', instance_id=instance.id, step_id=next_step.id)
+        return redirect('processes:request_list')
+
+    return render(request, 'certificates/step.html', {
+        'instance': instance,
+        'template': template,
+        'cert': cert,
+        'previous_step': previous_step,
+        'next_step': next_step,
+    })
+
+
+@login_required
+def certificate_print(request, instance_id):
+    instance = get_object_or_404(ProcessInstance, id=instance_id)
+    cert = CertificateInstance.objects.filter(process_instance=instance).order_by('-created').first()
+    template = cert.template if cert else None
+    return render(request, 'certificates/print.html', {
+        'instance': instance,
+        'cert': cert,
+        'template': template,
+    })
+
+