Initial claims system setup

claims/models.py

@@ -0,0 +1,110 @@
+from django.conf import settings
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+
+class Project(models.Model):
+    name = models.CharField(max_length=255)
+    code = models.CharField(max_length=50, blank=True)
+    is_active = models.BooleanField(default=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        ordering = ["name"]
+
+    def __str__(self):
+        if self.code:
+            return f"{self.code} – {self.name}"
+        return self.name
+
+
+class Claim(models.Model):
+    class Status(models.TextChoices):
+        PENDING = "pending", _("Pending")
+        APPROVED = "approved", _("Approved")
+        REJECTED = "rejected", _("Rejected")
+
+    class Currency(models.TextChoices):
+        SEK = "SEK", _("Swedish krona (SEK)")
+        EUR = "EUR", _("Euro (EUR)")
+        USD = "USD", _("US dollar (USD)")
+        GBP = "GBP", _("British pound (GBP)")
+
+    submitted_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="claims_submitted",
+    )
+    full_name = models.CharField(max_length=255)
+    email = models.EmailField()
+    amount = models.DecimalField(max_digits=10, decimal_places=2)
+    currency = models.CharField(
+        max_length=3,
+        choices=Currency.choices,
+        default=Currency.SEK,
+    )
+    description = models.TextField(help_text=_("Describe what the reimbursement is for"))
+    account_number = models.CharField(max_length=50)
+    receipt = models.FileField(upload_to="receipts/", blank=True, null=True)
+    project = models.ForeignKey(
+        Project,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="claims",
+    )
+    status = models.CharField(max_length=20, choices=Status.choices, default=Status.PENDING)
+    decision_note = models.TextField(blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        ordering = ["-created_at"]
+
+    def __str__(self):
+        project = f" [{self.project}]" if self.project else ""
+        return f"{self.full_name} – {self.amount} {self.currency}{project} ({self.get_status_display()})"
+
+    def add_log(self, *, action, performed_by=None, from_status=None, to_status=None, note=""):
+        return ClaimLog.objects.create(
+            claim=self,
+            action=action,
+            from_status=from_status,
+            to_status=to_status or self.status,
+            note=note or "",
+            performed_by=performed_by,
+        )
+
+
+class ClaimLog(models.Model):
+    class Action(models.TextChoices):
+        CREATED = "created", _("Submitted")
+        STATUS_CHANGED = "status_changed", _("Status changed")
+
+    claim = models.ForeignKey(Claim, related_name="logs", on_delete=models.CASCADE)
+    action = models.CharField(max_length=32, choices=Action.choices)
+    from_status = models.CharField(
+        max_length=20,
+        choices=Claim.Status.choices,
+        null=True,
+        blank=True,
+    )
+    to_status = models.CharField(max_length=20, choices=Claim.Status.choices)
+    note = models.TextField(blank=True)
+    performed_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="claim_logs",
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    class Meta:
+        ordering = ["-created_at"]
+
+    def __str__(self):
+        return f"{self.get_action_display()} ({self.created_at:%Y-%m-%d %H:%M})"