import uuid
from sqlalchemy import Column, String, DateTime, ForeignKey, func
from sqlalchemy.dialects.postgresql import UUID, JSONB
from sqlalchemy.orm import relationship

from app.database import Base


class AuditLog(Base):
    """
    Audit log model for tracking all system actions.
    
    Records user actions, entity changes, and system events
    for security auditing and compliance purposes.
    """
    __tablename__ = "audit_logs"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
    action = Column(String, nullable=False)
    entity_type = Column(String, nullable=True)
    entity_id = Column(String, nullable=True)
    timestamp = Column(DateTime(timezone=True), server_default=func.now())
    details = Column(JSONB, nullable=True)

    # Relationships
    user = relationship("User")