from datetime import datetime, timezone
from app.extensions import db
from app.models import account
from sqlalchemy.exc import IntegrityError
from sqlalchemy import and_, or_, not_
from sqlalchemy.sql import func

class Transaction(db.Model):
    __tablename__ = 'transactions'
    id = db.Column(
        db.Integer,
        primary_key=True,
        autoincrement=True,
    )
    transaction_id = db.Column(db.String(50), nullable=False)
    account_id = db.Column(db.String(50), nullable=True)
    customer_id = db.Column(db.String(50), nullable=True)
    type = db.Column(db.String(50), nullable=False)
    channel = db.Column(db.String(50), nullable=False)
    phone_number = db.Column(db.String(50), nullable=True)
    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())
    
    def __repr__(self):
        return f'<Transaction {self.id}>'

    @classmethod
    def create_transaction(cls, transaction_id, account_id, customer_id, type, channel):

        # if cls.query.filter_by(transaction_id=transaction_id).first():
        #     raise ValueError("Duplicate Transaction")

        if cls.query.filter( and_( cls.transaction_id ==transaction_id, cls.type==type) ).first():
            raise ValueError("Duplicate Transaction")



        transaction = cls(
            transaction_id = transaction_id,
            customer_id = customer_id,
            account_id = account_id,
            type = type,
            channel = channel,
            created_at=datetime.now(timezone.utc),
            updated_at=datetime.now(timezone.utc)
        )

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

        return transaction

    @classmethod
    def get_transaction_by_id(cls, transaction_id):
        return cls.query.get(transaction_id)