feat: add RequestToPublish to ClassifiedAd with state management

domain/marketplace/classified_ad.py

@@ -2,8 +2,12 @@ from dataclasses import dataclass, field
 from decimal import Decimal
 
 from domain.marketplace.classified_ad_id import ClassifiedAdId
+from domain.marketplace.classified_ad_state import ClassifiedAdState
 from domain.marketplace.classified_ad_text import ClassifiedAdText
 from domain.marketplace.classified_ad_title import ClassifiedAdTitle
+from domain.marketplace.invalid_entity_state_exception import (
+    InvalidEntityStateException,
+)
 from domain.marketplace.price import Price
 from domain.marketplace.user_id import UserId
 
@@ -15,3 +19,27 @@ class ClassifiedAd:
     title: ClassifiedAdTitle
     text: ClassifiedAdText
     price: Price = field(default_factory=lambda: Price(amount=Decimal("0.00")))
+    state: ClassifiedAdState | None = None
+
+    def request_to_publish(self):
+        errors = []
+        if not self.title.title:
+            errors.append("title")
+        if not self.text.text:
+            errors.append("text")
+        if self.price.amount <= 0:
+            errors.append("price")
+
+        if errors:
+            raise InvalidEntityStateException(
+                f"Cannot publish classified ad with missing or invalid: {', '.join(errors)}"
+            )
+
+        return ClassifiedAd(
+            id=self.id,
+            _ownerId=self._ownerId,
+            title=self.title,
+            text=self.text,
+            price=self.price,
+            state=ClassifiedAdState.PendingReview,
+        )