from datetime import datetime, timezone, timedelta
from os.path import devnull

from app.extensions import db
from sqlalchemy.orm import relationship

class LoanCharge(db.Model):
    __tablename__ = 'loan_charges'

    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    loan_id = db.Column(db.Integer, nullable=False)
    transaction_id = db.Column(db.String(50), nullable=True)
    code = db.Column(db.String(50), nullable=False)
    amount = db.Column(db.Float, default=0.0)
    percent = db.Column(db.Float, default=0.0)
    description = db.Column(db.Text, nullable=True)
    due = db.Column(db.Integer, nullable=False)
    due_date = db.Column(db.DateTime, nullable=True)
    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))

    loan = relationship(
        "Loan",
        primaryjoin="LoanCharge.loan_id == Loan.id",
        foreign_keys=[loan_id],
        back_populates="loan_charges",
    )

    def __repr__(self):
        return f"<LoanCharge {self.id} - Loan {self.loan_id} - {self.code}>"

    def to_dict(self):
        """
        Convert the Loan charge object to a dictionary format for JSON serialization.
        """
        return {
            'id': self.id,
            'loanId': self.loan_id,
            'transactionId': self.transaction_id,
            'code': self.code,
            'amount': self.amount,
            'percent': self.percent,
            'description': self.description,
            'due': self.due
        }

    @classmethod
    def get_loan_charge_by_debt_id(cls, debt_id):
        return cls.query.filter_by(loan_id=debt_id)