"""
Attachment Model - ServiceManagerWeb
"""
from sqlalchemy import String, ForeignKey, Integer, DateTime, func
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID
from typing import Optional, TYPE_CHECKING
from datetime import datetime
import uuid

from app.core.database import Base

if TYPE_CHECKING:
    from app.models.ticket import Ticket
    from app.models.comment import TicketComment
    from app.models.user import User


class TicketAttachment(Base):
    """Modelo de archivos adjuntos en tickets"""
    __tablename__ = "ticket_attachments"
    
    # Sobrescribir campos heredados de Base para que coincidan con la tabla real
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    # Esta tabla NO tiene updated_at, así que lo excluimos del mapping
    
    ticket_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("tickets.id", ondelete="CASCADE"),
        nullable=False
    )
    
    comment_id: Mapped[Optional[uuid.UUID]] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("ticket_comments.id", ondelete="CASCADE"),
        nullable=True
    )
    
    uploaded_by: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id"),
        nullable=False
    )
    
    filename: Mapped[str] = mapped_column(String(255), nullable=False)
    original_filename: Mapped[str] = mapped_column(String(255), nullable=False)
    mime_type: Mapped[str] = mapped_column(String(100), nullable=False)
    file_size: Mapped[int] = mapped_column(Integer, nullable=False)
    file_path: Mapped[str] = mapped_column(String(500), nullable=False)
    
    md5_hash: Mapped[Optional[str]] = mapped_column(String(32), nullable=True)
    sha256_hash: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)
    
    ticket: Mapped["Ticket"] = relationship("Ticket", back_populates="attachments")
    comment: Mapped[Optional["TicketComment"]] = relationship("TicketComment", back_populates="attachments")
    uploaded_by_user: Mapped["User"] = relationship("User")
    
    # Excluir updated_at del mapping ya que la tabla no lo tiene
    __mapper_args__ = {
        "exclude_properties": ["updated_at"]
    }