factories init (tbc)

src/models.py

@@ -22,6 +22,20 @@ class Currency(str, Enum):
         return f"Currency.{self.name}"
 
 
+class Sign(str, Enum):
+    DEBIT = "DBIT"
+    CREDIT = "CRDT"
+
+    def __str__(self):
+        return self.value
+
+    def __repr__(self):
+        return f"Sign.{self.name}"
+
+    def to_sign(self) -> int:
+        return -1 if self is Sign.DEBIT else 1
+
+
 class B4wExport(BaseModel):
     id: int = Field(alias="Id1", description="internal B4w ID")
     account_iban: str = Field(alias="OwnrAcctIBAN", pattern=IBAN_PATTERN)
@@ -30,7 +44,7 @@ class B4wExport(BaseModel):
     date_book: date = Field(alias="BookgDt")
     amount: Decimal = Field(alias="Amt")
     amount_currency: Currency = Field(alias="AmtCcy")
-    sign: int = Field(alias="CdtDbtInd")
+    sign: Sign = Field(alias="CdtDbtInd")
     reference: str = Field(alias="RmtInf")
     other_name: str = Field(alias="RmtdNm")
     other_iban: str = Field(alias="RmtdAcctIBAN")
@@ -39,19 +53,7 @@ class B4wExport(BaseModel):
 
     @property
     def amount_signed(self) -> Decimal:
-        return self.amount * self.sign
-
-    @field_validator("sign", mode="before")
-    @classmethod
-    def get_sign(cls, input_value: str) -> int:
-        if input_value == "DBIT":
-            return -1
-        elif input_value == "CRDT":
-            return 1
-        else:
-            raise ValidationError(
-                f"Invalid amount type: {input_value}. Expected DBIT or CRDT"
-            )
+        return self.amount * self.sign.to_sign()
 
     @field_validator("category", mode="before")
     @classmethod