from datetime import datetime, timezone
from sqlalchemy.orm import relationship
from app.extensions import db
from sqlalchemy.exc import IntegrityError
from sqlalchemy.sql import func

class Account(db.Model):
    __tablename__ = 'accounts'

    id = db.Column(db.String(50), primary_key=True)  
    customer_id = db.Column(db.String(50), nullable=False)
    account_type = db.Column(db.String(50))
    status = db.Column(db.String(20), default='active')
    lien_amount = db.Column(db.Float, default=0.0)
    created_at = db.Column(db.DateTime(timezone=True), server_default=func.now())
    updated_at = db.Column(db.DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

    # customer = relationship(
    #     "Customer",
    #     primaryjoin="Customer.id == Account.customer_id",
    #     foreign_keys=[customer_id],
    #     back_populates="accounts",
    # )

    @classmethod
    def create_account(cls, id, customer_id, account_type, status='active'):
        account = cls(
            id=id,
            customer_id=customer_id,
            account_type=account_type,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )

        try:
            db.session.add(account)
        except IntegrityError as err:
            raise ValueError(f"Database integrity error: {err}")
        return account

    @classmethod
    def is_valid_account(cls, account_id, customer_id):
        account = cls.query.filter_by(id=account_id, customer_id=customer_id).first()
        if not account:
            return False
        if account.lien_amount > 0:
            return False
        return account

    def __repr__(self):
        return f'<Account {self.id}>'