from sqlalchemy import Column, ForeignKey, String, Integer, Table
from sqlalchemy.dialects.sqlite import BLOB
from sqlalchemy.orm import relationship
from database import Base
from typing import Optional, List

project_user = Table(
    "project_user",
    Base.metadata,
    Column("project_id", Integer, ForeignKey("projects.id"), primary_key=True),
    Column("user_id", Integer, ForeignKey("users.id"), primary_key=True)
)

class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
    name = Column(String, index=True)
    email = Column(String, unique=True, index=True)
    password_hash = Column(String)
    password_salt = Column(String)
    projects = relationship("Project", secondary=project_user, back_populates="users")

class Project(Base):
    __tablename__ = "projects"

    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
    name = Column(String, index=True)
    description = Column(String)
    users = relationship("User", secondary=project_user, back_populates="projects")
    tasks = relationship("Task", back_populates="project")

class Task(Base):
    __tablename__ = "tasks"

    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
    title = Column(String, index=True)
    description = Column(String)
    status = Column(String, default="pending")
    project_id = Column(Integer, ForeignKey("projects.id"))
    project = relationship("Project", back_populates="tasks")