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

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

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, index=True)
    password_hash = db.Column(db.String(128))
    files = db.relationship('File', backref='owner', lazy='dynamic')
    shares = db.relationship('Share', backref='creator', 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)

class File(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(255))
    storage_name = db.Column(db.String(255))  # Added field for UUID-based storage
    mime_type = db.Column(db.String(128))
    size = db.Column(db.Integer, default=0)
    is_folder = db.Column(db.Boolean, default=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    parent_id = db.Column(db.Integer, db.ForeignKey('file.id'))
    
    # Add relationship to represent folder structure
    children = db.relationship('File', 
                               backref=db.backref('parent', remote_side=[id]),
                               lazy='dynamic')
    
    # Add relationship for shared files
    shares = db.relationship('Share', backref='file', lazy='dynamic')

class Share(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    file_id = db.Column(db.Integer, db.ForeignKey('file.id'))
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    token = db.Column(db.String(64), unique=True)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    expires_at = db.Column(db.DateTime, nullable=True)
    downloads = db.relationship('Download', backref='share', lazy='dynamic')

class Download(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    file_id = db.Column(db.Integer, db.ForeignKey('file.id'))
    share_id = db.Column(db.Integer, db.ForeignKey('share.id'))
    ip_address = db.Column(db.String(45))
    timestamp = db.Column(db.DateTime, default=datetime.utcnow)