from sqlalchemy import Column, String, Boolean, DateTime, Date, Integer, ForeignKey
from sqlalchemy.sql import func
from sqlalchemy.orm import relationship
from app.core.database.db_session import Base

class User(Base):
    __tablename__ = "users"

    user_id = Column(String(26), primary_key=True)
    employee_code = Column(String(30), unique=True, nullable=True)
    first_name = Column(String(50), nullable=False)
    last_name = Column(String(50), nullable=False)
    display_name = Column(String(100), nullable=True)
    email = Column(String(150), unique=True, nullable=False)
    phone = Column(String(20), unique=True, nullable=False)
    password_hash = Column(String(255), nullable=False)
    profile_image_id = Column(String(26), nullable=True)  # FK defined via alter table or string to avoid circular dependency
    gender = Column(String(15), nullable=True)
    dob = Column(Date, nullable=True)
    
    department_id = Column(String(26), ForeignKey("departments.department_id", ondelete="RESTRICT"), nullable=False)
    designation_id = Column(String(26), ForeignKey("designations.designation_id", ondelete="RESTRICT"), nullable=False)
    role_id = Column(String(26), ForeignKey("roles.role_id", ondelete="RESTRICT"), nullable=False)
    manager_id = Column(String(26), ForeignKey("users.user_id", ondelete="SET NULL"), nullable=True)

    is_active = Column(Boolean, default=True)
    email_verified = Column(Boolean, default=False)
    phone_verified = Column(Boolean, default=False)
    failed_login_attempts = Column(Integer, default=0)
    is_locked = Column(Boolean, default=False)
    last_login = Column(DateTime, nullable=True)
    mfa_secret = Column(String(32), nullable=True)
    mfa_enabled = Column(Boolean, default=False)
    
    created_at = Column(DateTime, server_default=func.now())
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())
    deleted_at = Column(DateTime, nullable=True)

    # Relationships
    department = relationship("Department", foreign_keys=[department_id])
    designation = relationship("Designation", foreign_keys=[designation_id])
    role = relationship("Role", foreign_keys=[role_id])
    manager = relationship("User", remote_side=[user_id], backref="subordinates")