backend/database/models.py

import os
from datetime import datetime
from sqlalchemy import create_engine, Column, Integer, String, DateTime, Text, Boolean, ForeignKey
from sqlalchemy.orm import declarative_base, sessionmaker, relationship

# Configuración de SQLite
DB_PATH = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "letxipu.db")
engine = create_engine(f"sqlite:///{DB_PATH}", echo=False)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

class User(Base):
    __tablename__ = "users"
    
    id = Column(Integer, primary_key=True, index=True)
    username = Column(String, unique=True, index=True, nullable=False)
    hashed_password = Column(String, nullable=False)
    role = Column(String, default="user")
    created_at = Column(DateTime, default=datetime.utcnow)
    
    projects = relationship("Project", back_populates="owner", cascade="all, delete-orphan")


class Project(Base):
    __tablename__ = "projects"
    
    id = Column(Integer, primary_key=True, index=True)
    title = Column(String, nullable=False)
    description = Column(Text, nullable=True)
    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)
    
    owner = relationship("User", back_populates="projects")
    jobs = relationship("ResearchJob", back_populates="project", cascade="all, delete-orphan")


class ResearchJob(Base):
    __tablename__ = "research_jobs"
    
    id = Column(Integer, primary_key=True, index=True)
    project_id = Column(Integer, ForeignKey("projects.id"), nullable=False)
    query = Column(Text, nullable=False)
    status = Column(String, default="pending")  # pending, running, completed, error
    progress_pct = Column(Integer, default=0)
    report_md = Column(Text, nullable=True)
    created_at = Column(DateTime, default=datetime.utcnow)
    completed_at = Column(DateTime, nullable=True)
    
    project = relationship("Project", back_populates="jobs")

# Crear las tablas en la base de datos si no existen
def init_db():
    Base.metadata.create_all(bind=engine)

if __name__ == "__main__":
    init_db()
    print(f"Base de datos inicializada en: {DB_PATH}")