models.py

from app import db
from datetime import datetime

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, nullable=False)
    email = db.Column(db.String(120), unique=True, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    
    # Relationship with progress
    progress_entries = db.relationship('Progress', backref='user', lazy=True)

class Tutorial(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    slug = db.Column(db.String(100), unique=True, nullable=False)
    category = db.Column(db.String(50), nullable=False)
    difficulty = db.Column(db.String(20), nullable=False)  # beginner, intermediate, advanced
    order_index = db.Column(db.Integer, nullable=False)
    estimated_time = db.Column(db.Integer)  # in minutes
    description = db.Column(db.Text)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

class Progress(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    tutorial_id = db.Column(db.Integer, db.ForeignKey('tutorial.id'), nullable=False)
    completed = db.Column(db.Boolean, default=False)
    current_step = db.Column(db.Integer, default=0)
    completion_date = db.Column(db.DateTime)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

class Project(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    slug = db.Column(db.String(100), unique=True, nullable=False)
    category = db.Column(db.String(50), nullable=False)
    difficulty = db.Column(db.String(20), nullable=False)
    description = db.Column(db.Text)
    estimated_time = db.Column(db.Integer)  # in minutes
    prerequisites = db.Column(db.Text)  # JSON string of tutorial IDs
    created_at = db.Column(db.DateTime, default=datetime.utcnow)