Added offer and charge

app/models/charge.py

@@ -0,0 +1,82 @@
+from datetime import datetime, timezone
+from app.extensions import db
+from sqlalchemy.orm import relationship
+
+class Charge(db.Model):
+    __tablename__ = 'charges'
+
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    offer_id = db.Column(db.String, db.ForeignKey('offers.id'), nullable=False)
+    code = db.Column(db.String(50), nullable=False)
+    percent = db.Column(db.Float, nullable=False)
+    description = db.Column(db.String(255), nullable=True)
+    due = db.Column(db.Integer, default=0)
+    created_at = db.Column(db.DateTime, default=datetime.now(timezone.utc))
+    updated_at = db.Column(db.DateTime, default=datetime.now(timezone.utc), onupdate=datetime.now(timezone.utc))
+
+    offer = relationship(
+        "Offer",
+        back_populates="charges",
+        foreign_keys=[offer_id]
+    )
+
+    @classmethod
+    def get_all_charges(cls, offer_id=None, code=None, start_date=None, end_date=None, page=1, limit=20):
+        """
+        Get all charges with optional filtering
+
+        Args:
+            offer_id (str, optional): Filter by offer ID
+            code (str, optional): Filter by charge code
+            start_date (datetime, optional): Filter by start date (created_at)
+            end_date (datetime, optional): Filter by end date (created_at)
+            page (int, optional): Page number for pagination
+            limit (int, optional): Number of items per page
+
+        Returns:
+            tuple: (list of Charge objects, total count)
+        """
+        query = cls.query
+
+        # Apply filters if provided
+        if offer_id:
+            query = query.filter(cls.offer_id == offer_id)
+
+        if code:
+            query = query.filter(cls.code == code)
+
+        if start_date:
+            query = query.filter(cls.created_at >= start_date)
+
+        if end_date:
+            query = query.filter(cls.created_at <= end_date)
+
+        # Order by created_at descending (newest first)
+        query = query.order_by(cls.created_at.desc())
+
+        # Get total count before pagination
+        total_count = query.count()
+
+        # Apply pagination
+        offset = (page - 1) * limit
+        query = query.limit(limit).offset(offset)
+
+        return query.all(), total_count
+
+    def to_dict(self):
+        """
+        Convert the Charge object to a dictionary format for JSON serialization.
+        """
+        return {
+            'id': self.id,
+            'offer_id': self.offer_id,
+            'code': self.code,
+            'percent': self.percent,
+            'description': self.description,
+            'due': self.due,
+            'created_at': self.created_at.isoformat() if self.created_at else None,
+            'updated_at': self.updated_at.isoformat() if self.updated_at else None
+        }
+
+    def __repr__(self):
+        return f'<Charge {self.id} - {self.code}>'