from sqlalchemy import Column, String, Integer, Text, ForeignKey, Boolean
from sqlalchemy.orm import relationship
from app.models.base import BaseModel


class Document(BaseModel):
    __tablename__ = "documents"

    user_id = Column(String(36), ForeignKey("users.id"), nullable=False, index=True)
    title = Column(String(500), nullable=False)
    filename = Column(String(500), nullable=False)
    file_type = Column(String(50), nullable=False)  # pdf, md, txt, docx
    file_size = Column(Integer, nullable=False)
    file_path = Column(String(1000), nullable=False)
    folder_id = Column(String(36), ForeignKey("folders.id"), nullable=True)  # 新增
    summary = Column(Text, nullable=True)
    chunk_count = Column(Integer, default=0)
    is_indexed = Column(Boolean, default=False)

    chunks = relationship("DocumentChunk", back_populates="document", cascade="all, delete-orphan")


class DocumentChunk(BaseModel):
    __tablename__ = "document_chunks"

    document_id = Column(String(36), ForeignKey("documents.id"), nullable=False, index=True)
    chunk_index = Column(Integer, nullable=False)
    content = Column(Text, nullable=False)
    metadata_ = Column(String(2000), nullable=True)  # JSON 存储元数据
    chroma_collection = Column(String(255), nullable=True)
    chroma_id = Column(String(255), nullable=True)

    document = relationship("Document", back_populates="chunks")