from flask_sqlalchemy import SQLAlchemy
from flask_login import UserMixin

from app import db

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(255), nullable=False, unique=True)
    password_hash = db.Column(db.Text, nullable=False)
    profile = db.relationship('Profile', backref='user', uselist=False, lazy='joined')

class Profile(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False, index=True)
    name = db.Column(db.String(100))
    email = db.Column(db.String(150), unique=True)
    profile_pic = db.deferred(db.Column(db.Text))  # Store image as a base64 string, deferred so it doesn't load on every query
    systolic_threshold = db.Column(db.Integer, default=140)
    diastolic_threshold = db.Column(db.Integer, default=90)
    dark_mode = db.Column(db.Boolean, default=False)
    timezone = db.Column(db.String(50), default='UTC')  # e.g., 'Australia/Sydney'
    updated_at = db.Column(db.DateTime, default=db.func.now(), onupdate=db.func.now())

class Reading(db.Model):
    __table_args__ = (
        db.Index('ix_reading_user_timestamp', 'user_id', 'timestamp'),
    )

    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    timestamp = db.Column(db.DateTime, nullable=False)
    systolic = db.Column(db.Integer, nullable=False)
    diastolic = db.Column(db.Integer, nullable=False)
    heart_rate = db.Column(db.Integer, nullable=False)
    user = db.relationship('User', backref='readings')