Compensation forms refactoring

* splits compensation/forms.py and /modalForms.py into individual files inside new packages
    * general forms stay in new files in compensation/forms
    * modal forms stay in new files in compensation/forms/modals

compensation/forms/modals/payment.py

@@ -0,0 +1,136 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: ksp-servicestelle@sgdnord.rlp.de
+Created on: 18.08.22
+
+"""
+from django import forms
+from django.utils.translation import pgettext_lazy as _con, gettext_lazy as _
+
+from konova.forms.modals import RemoveModalForm, BaseModalForm
+from konova.utils.message_templates import PAYMENT_EDITED
+
+
+class NewPaymentForm(BaseModalForm):
+    """ Form handling payment related input
+
+    """
+    amount = forms.DecimalField(
+        min_value=0.00,
+        decimal_places=2,
+        label=_con("money", "Amount"),  # contextual translation
+        label_suffix=_(""),
+        help_text=_("in Euro"),
+        widget=forms.NumberInput(
+            attrs={
+                "class": "form-control",
+                "placeholder": "0,00",
+            }
+        )
+    )
+    due = forms.DateField(
+        label=_("Due on"),
+        label_suffix=_(""),
+        required=False,
+        help_text=_("Due on which date"),
+        widget=forms.DateInput(
+            attrs={
+                "type": "date",
+                "data-provide": "datepicker",
+                "class": "form-control",
+            },
+            format="%d.%m.%Y"
+        )
+    )
+    comment = forms.CharField(
+        max_length=200,
+        required=False,
+        label=_("Comment"),
+        label_suffix=_(""),
+        help_text=_("Additional comment, maximum {} letters").format(200),
+        widget=forms.Textarea(
+            attrs={
+                "rows": 5,
+                "class": "form-control"
+            }
+        )
+    )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.intervention = self.instance
+        self.form_title = _("Payment")
+        self.form_caption = _("Add a payment for intervention '{}'").format(self.intervention.title)
+
+    def is_valid(self):
+        """
+        Checks on form validity.
+
+        For this form we need to make sure that a date or a comment is set.
+        If both are missing, the user needs to enter at least an explanation why
+        there is no date to be entered.
+
+        Returns:
+            is_valid (bool): True if valid, False otherwise
+        """
+        super_valid = super().is_valid()
+        date = self.cleaned_data["due"]
+        comment = self.cleaned_data["comment"] or None
+        if not date and not comment:
+            # At least one needs to be set!
+            self.add_error(
+                "comment",
+                _("If there is no date you can enter, please explain why.")
+            )
+            return False
+        return super_valid
+
+    def save(self):
+        pay = self.instance.add_payment(self)
+        return pay
+
+
+class EditPaymentModalForm(NewPaymentForm):
+    """ Form handling edit for Payment
+
+    """
+    payment = None
+
+    def __init__(self, *args, **kwargs):
+        self.payment = kwargs.pop("payment", None)
+        super().__init__(*args, **kwargs)
+        self.form_title = _("Edit payment")
+        form_date = {
+            "amount": self.payment.amount,
+            "due": str(self.payment.due_on),
+            "comment": self.payment.comment,
+        }
+        self.load_initial_data(form_date, disabled_fields=[])
+
+    def save(self):
+        payment = self.payment
+        payment.amount = self.cleaned_data.get("amount", None)
+        payment.due_on = self.cleaned_data.get("due", None)
+        payment.comment = self.cleaned_data.get("comment", None)
+        payment.save()
+        self.instance.mark_as_edited(self.user, self.request, edit_comment=PAYMENT_EDITED)
+        self.instance.send_data_to_egon()
+        return payment
+
+
+class RemovePaymentModalForm(RemoveModalForm):
+    """ Removing modal form for Payment
+
+    Can be used for anything, where removing shall be confirmed by the user a second time.
+
+    """
+    payment = None
+
+    def __init__(self, *args, **kwargs):
+        payment = kwargs.pop("payment", None)
+        self.payment = payment
+        super().__init__(*args, **kwargs)
+
+    def save(self):
+        self.instance.remove_payment(self)