from datetime import datetime
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash
from app.extensions import db, login_manager


class User(UserMixin, db.Model):
    __tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(255), unique=True, nullable=False, index=True)
    password_hash = db.Column(db.String(255), nullable=False)
    name = db.Column(db.String(255))
    institution = db.Column(db.String(255))
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    datasets = db.relationship('Dataset', backref='owner', lazy='dynamic')
    analysis_runs = db.relationship('AnalysisRun', backref='user', lazy='dynamic')

    def set_password(self, password):
        self.password_hash = generate_password_hash(password)

    def check_password(self, password):
        return check_password_hash(self.password_hash, password)


@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))