feat: dodaj prefill email potpisa i body logging

Uvodi signature polje i default predlozak potpisa za nove korisnike, te data migraciju koja popunjava postojece prazne potpise. Email flow sada dosljedno dodaje korisnicki potpis i sprema finalni body poruke u dispatch log radi audita.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/core/users/admin.py

@@ -9,7 +9,7 @@ class CustomUserAdmin(UserAdmin):
     list_display = ('email', 'first_name', 'last_name', 'occupation', 'work_position', 'residence', 'is_serviser', 'is_kupac', 'is_team_member', 'is_active', 'client_profile')
     fieldsets = (
         (None, {'fields': ('email', 'password')}),
-        ('Osobni podaci', {'fields': ('first_name', 'last_name', 'telefon', 'oib', 'occupation', 'work_position', 'residence')}),
+        ('Osobni podaci', {'fields': ('first_name', 'last_name', 'telefon', 'oib', 'occupation', 'work_position', 'residence', 'signature')}),
         ('ERP Status', {'fields': ('is_active', 'is_staff', 'is_superuser', 'is_serviser', 'is_kupac', 'is_team_member', 'is_verified', 'client_profile')}),
         ('Važni datumi', {'fields': ('last_login', 'date_joined')}),
     )
@@ -18,7 +18,7 @@ class CustomUserAdmin(UserAdmin):
     add_fieldsets = (
         (None, {
             'classes': ('wide',),
-            'fields': ('email', 'password', 'is_team_member'),
+            'fields': ('email', 'password', 'first_name', 'last_name', 'telefon', 'occupation', 'signature', 'is_team_member'),
         }),
     )
 

backend/core/users/migrations/0007_customuser_signature.py

@@ -0,0 +1,16 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0006_customuser_work_position'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='customuser',
+            name='signature',
+            field=models.TextField(blank=True, default='', verbose_name='Email potpis'),
+        ),
+    ]

backend/core/users/migrations/0008_prefill_empty_signatures.py

@@ -0,0 +1,39 @@
+from django.db import migrations
+
+
+def prefill_empty_signatures(apps, schema_editor):
+    CustomUser = apps.get_model('users', 'CustomUser')
+    for user in CustomUser.objects.all().iterator():
+        signature_value = user.signature if isinstance(user.signature, str) else ''
+        if signature_value.strip():
+            continue
+        first_name = (user.first_name or '').strip()
+        last_name = (user.last_name or '').strip()
+        full_name = f"{first_name} {last_name}".strip()
+        fallback_name = (user.email or '').strip() or 'Ime i prezime'
+        display_name = full_name or fallback_name
+        occupation = (user.occupation or '').strip()
+        name_line = f"{occupation} {display_name}".strip() if occupation else display_name
+        mobile = (user.telefon or '').strip() or "+385 91 636 3466"
+        signature = (
+            "Poslano iz aplikacije\n"
+            "S poštovanjem / Freundliche Grüße / Kind regards\n\n"
+            f"{name_line}\n\n"
+            "KNEZ LJUBO d.o.o.\n"
+            "Ivlje 44, 10040 Zagreb\n\n"
+            "Office: Donje Svetice 40, 10000 Zagreb\n\n"
+            f"Mobile: {mobile}\n\n"
+            "www.knezljubo.hr"
+        )
+        user.signature = signature
+        user.save(update_fields=['signature'])
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ('users', '0007_customuser_signature'),
+    ]
+
+    operations = [
+        migrations.RunPython(prefill_empty_signatures, migrations.RunPython.noop),
+    ]

backend/core/users/models.py

@@ -3,6 +3,17 @@ from django.core.exceptions import ValidationError
 from django.db import models
 from .managers import CustomUserManager
 
+DEFAULT_EMAIL_SIGNATURE_TEMPLATE = (
+    "Poslano iz aplikacije\n"
+    "S poštovanjem / Freundliche Grüße / Kind regards\n\n"
+    "{name_line}\n\n"
+    "KNEZ LJUBO d.o.o.\n"
+    "Ivlje 44, 10040 Zagreb\n\n"
+    "Office: Donje Svetice 40, 10000 Zagreb\n\n"
+    "Mobile: {mobile}\n\n"
+    "www.knezljubo.hr"
+)
+
 class CustomUser(AbstractUser):
     # Email koristimo za login, pa mora biti jedinstven
     username=None
@@ -19,6 +30,7 @@ class CustomUser(AbstractUser):
     occupation = models.CharField(max_length=120, blank=True, default='', verbose_name="Zanimanje")
     residence = models.CharField(max_length=255, blank=True, default='', verbose_name="Prebivalište")
     work_position = models.CharField(max_length=120, blank=True, default='', verbose_name="Na radnom mjestu")
+    signature = models.TextField(blank=True, default='', verbose_name="Email potpis")
     licence_number = models.CharField(max_length=50, blank=True, null=True, verbose_name="Broj licence")
     is_verified = models.BooleanField(default=False, verbose_name="Verificiran profil")
 
@@ -47,6 +59,27 @@ class CustomUser(AbstractUser):
         if self.is_kupac and not self.client_profile:
             raise ValidationError({'client_profile': "Korisnik koji je označen kao kupac mora imati povezan klijentski profil."})
 
+    def build_default_signature(self):
+        full_name = self.get_full_name().strip()
+        fallback_name = self.email.strip() if isinstance(self.email, str) and self.email.strip() else 'Ime i prezime'
+        display_name = full_name or fallback_name
+        occupation = self.occupation.strip() if isinstance(self.occupation, str) else ''
+        name_line = f"{occupation} {display_name}".strip() if occupation else display_name
+        mobile = self.telefon.strip() if isinstance(self.telefon, str) and self.telefon.strip() else "+385 91 636 3466"
+        return DEFAULT_EMAIL_SIGNATURE_TEMPLATE.format(
+            name_line=name_line,
+            mobile=mobile,
+        )
+
+    def get_email_signature(self):
+        stored_signature = self.signature.strip() if isinstance(self.signature, str) else ''
+        if stored_signature:
+            return stored_signature
+        return self.build_default_signature()
+
     def save(self, *args, **kwargs):
+        signature = self.signature.strip() if isinstance(self.signature, str) else ''
+        if not signature:
+            self.signature = self.build_default_signature()
         self.full_clean() # Prisiljava pokretanje clean() prije svakog save()
-        super().save(*args, **kwargs)
+        super().save(*args, **kwargs)

backend/core/users/tests/test_email_signature.py

@@ -0,0 +1,39 @@
+import uuid
+
+import pytest
+from django.contrib.auth import get_user_model
+
+
+@pytest.mark.django_db
+def test_new_user_gets_prefilled_signature():
+    User = get_user_model()
+    suffix = uuid.uuid4().hex[:8]
+    user = User.objects.create_user(
+        email=f"signature-{suffix}@example.test",
+        password="test1234",
+        first_name="Mario",
+        last_name="Tkalac",
+        telefon="+385916363466",
+    )
+
+    signature = user.signature
+    assert signature.startswith("Poslano iz aplikacije\n")
+    assert "S poštovanjem / Freundliche Grüße / Kind regards" in signature
+    assert "Mario Tkalac" in signature
+    assert "KNEZ LJUBO d.o.o." in signature
+    assert "Office: Donje Svetice 40, 10000 Zagreb" in signature
+    assert "Mobile: +385916363466" in signature
+    assert "www.knezljubo.hr" in signature
+
+
+@pytest.mark.django_db
+def test_custom_signature_is_preserved():
+    User = get_user_model()
+    user = User.objects.create_user(
+        email=f"custom-signature-{uuid.uuid4().hex[:8]}@example.test",
+        password="test1234",
+        signature="Custom email signature",
+    )
+
+    assert user.signature == "Custom email signature"
+    assert user.get_email_signature() == "Custom email signature"