from datetime import datetime
from app import db
from flask_login import UserMixin
from app import login
from werkzeug.security import generate_password_hash, check_password_hash
from hashlib import md5

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key = True)
    username = db.Column(db.String(64), index = True, unique = True)
    email = db.Column(db.String(120), index = True, unique = True)
    wish = db.Column( db.String(200), index = True, unique = True)
    school = db.Column( db.String(64), index = True, unique = True )
    street = db.Column( db.String(64), index = True, unique = True )
    building = db.Column( db.Integer, index = True, unique = True )
    flat = db.Column( db.Integer, index = True, unique = True )
    password_hash = db.Column( db.String(128) )
    posts = db.relationship('Post', backref = 'author', lazy = 'dynamic')
#    about_me = db.Column( db.String(140) )
#    last_seen = db.Column( db.DateTime, default = datetime.utcnow )
    
    def __repr__(self):
        return "User {}".format(self.username)
    
    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)
    
    def avatar(self, size):
        digest = md5( self.email.lower().encode('utf-8') ).hexdigest()
        return 'https://www.gravatar.com/avatar/{}?d=identicon&s={}'.format(digest, size)


class Post(db.Model):
    id = db.Column(db.Integer, primary_key = True)
    body = db.Column( db.String(140) )
    timestamp = db.Column( db.DateTime, index = True, default = datetime.utcnow )
    user_id = db.Column( db.Integer, db.ForeignKey('user.id') )
    
    def __repr__(self):
        return "<Post {}>".format(self.body)
    
@login.user_loader
def load_user(id):
    return User.query.get( int(id) )