import uuid
from datetime import datetime
from sqlalchemy import Column, String, Integer, DateTime, Text, Boolean, ForeignKey
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import relationship
from app.database import Base

class Lesson(Base):
    __tablename__ = "lessons"
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    title = Column(String(255), nullable=False)
    content = Column(Text, nullable=False)
    category = Column(String(50))
    difficulty = Column(String(20))
    duration_min = Column(Integer, default=5)
    order_num = Column(Integer)
    is_premium = Column(Boolean, default=False)

class UserLesson(Base):
    __tablename__ = "user_lessons"
    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=False)
    lesson_id = Column(UUID(as_uuid=True), ForeignKey("lessons.id"), nullable=False)
    completed_at = Column(DateTime, default=datetime.utcnow)
    
    user = relationship("User", back_populates="completed_lessons")
    lesson = relationship("Lesson")