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

from app.database import Base
from app.models.enums import TeamSide


class Evidence(Base):
    """
    Evidence model for storing file metadata associated with tests.
    
    Files are stored in MinIO, and this model tracks the file location,
    integrity hash, and upload metadata.
    
    The ``team`` field distinguishes whether this evidence was uploaded by
    Red Team (attack evidence) or Blue Team (detection evidence).
    """
    __tablename__ = "evidences"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    test_id = Column(UUID(as_uuid=True), ForeignKey("tests.id"), nullable=False)
    file_name = Column(String, nullable=False)
    file_path = Column(String, nullable=False)  # Path in MinIO
    sha256_hash = Column(String, nullable=False)
    uploaded_by = Column(UUID(as_uuid=True), ForeignKey("users.id"), nullable=True)
    uploaded_at = Column(DateTime(timezone=True), server_default=func.now())
    team = Column(Enum(TeamSide, name="teamside"), nullable=False, default=TeamSide.red)
    notes = Column(Text, nullable=True)
    data_classification = Column(String(20), nullable=False, server_default="internal")

    # Relationships
    test = relationship("Test", back_populates="evidences")
    uploader = relationship("User", foreign_keys=[uploaded_by])
