import uuid
from datetime import datetime

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

from app.database import Base


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.
    """
    __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, default=datetime.utcnow)

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