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from flask_sqlalchemy import SQLAlchemy
from datetime import datetime

db = SQLAlchemy()

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(100), nullable=False)
    email = db.Column(db.String(100), nullable=False, unique=True)
    password = db.Column(db.String(200), nullable=False)
    account_number = db.Column(db.String(20), nullable=False, unique=True)
    balance = db.Column(db.Float, nullable=False, default=0.0)
    phone = db.Column(db.String(20), nullable=True)
    pin = db.Column(db.String(200), nullable=True)
    tier = db.Column(db.Integer, default=0)
    # KYC fields
    nin = db.Column(db.String(20), nullable=True)
    bvn = db.Column(db.String(20), nullable=True)
    id_card_url = db.Column(db.String(200), nullable=True)
    nepa_bill_url = db.Column(db.String(200), nullable=True)
    kyc_status = db.Column(db.String(20), default="none")
    daily_limit = db.Column(db.Float, default=0.0)
    max_balance = db.Column(db.Float, default=200000.0)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

class Transaction(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    sender_account_number = db.Column(db.String(20), nullable=False)
    recipient_account_number = db.Column(db.String(20), nullable=False)
    amount = db.Column(db.Float, nullable=False)
    status = db.Column(db.String(20), nullable=False, default="completed")
    is_external = db.Column(db.Boolean, default=False)
    reference = db.Column(db.String(50), nullable=True)
    ai_review = db.Column(db.String(500), nullable=True)
    transaction_type = db.Column(db.String(20), default="transfer")
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)

class Alert(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    account_number = db.Column(db.String(20), nullable=False)
    message = db.Column(db.String(500), nullable=False)
    read = db.Column(db.Boolean, default=False)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)

class PurityMemory(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    account_number = db.Column(db.String(20), nullable=False)
    memory = db.Column(db.Text, nullable=False)
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)