Changed bus roll to be a pdf view. Small changes needed to be able to email to companies.

Dropdown selection in admin > buses > Email Bus Roll To Company
Will email bus roll only to the company the route is a member of. Will show all to the admin in a pdf file.

Recipients are currently hardcoded for testing purposes.

busManager/coord/email_helpers.py

@@ -0,0 +1,47 @@
+from datetime import date
+from io import BytesIO
+
+from django.contrib.admin.views.decorators import staff_member_required
+from django.core.mail import send_mail, EmailMessage
+from django.http import HttpResponse
+from django.template.loader import get_template
+from xhtml2pdf import pisa
+
+from coord.context_helpers import bus_roll_context
+from coord.models import Company
+
+
+def render_to_pdf(template, context):
+    html = get_template(template).render(context)
+    result = BytesIO()
+    pdf = pisa.pisaDocument(BytesIO(html.encode("ISO-8859-1")), result)
+    if pdf.err:
+        return HttpResponse("Invalid PDF", status_code=400, content_type='text/plan')
+    return HttpResponse(result.getvalue(), content_type='application/pdf')
+
+
+@staff_member_required
+def email_companies_bus_roll(request, query_set=None):
+    html_template = 'reports/bus_roll.html'
+    context = bus_roll_context(query_set)
+
+    for company in Company.objects.all():
+        company_route = []
+        for route in context.get("routes"):
+            bus = route.get("bus")
+            if route.get("bus").company == company:
+                company_route.append(route)
+        if not company_route:
+            continue
+        company_context = {'routes': company_route}
+        pdf = render_to_pdf(html_template, company_context)
+
+        subject = "Echuca Schools Bus Roll"
+        message = f"A new bus roll for {company.name} has been generated"
+        email_from = "bus.manager@education.vic.gov.au"
+        recipient = ["john.mullins@education.vic.gov.au", "nicole.edwards@education.vic.gov.au"]
+        email = EmailMessage(subject, message, email_from, recipient)
+        email.attach(f"school_bus_roll_{date.today()}.pdf", pdf.content)
+        email.send()
+
+    return render_to_pdf(html_template, context)