from sqlalchemy import Boolean, Enum, ForeignKey, Integer, JSON, String, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base import Base
from app.models.mixins import TimestampMixin


class KnowledgeSource(TimestampMixin, Base):
    """知识来源模型：保存指南、专家标准和考试要求来源。"""

    __tablename__ = "knowledge_sources"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    source_code: Mapped[str] = mapped_column(String(64), nullable=False, unique=True, index=True)
    source_name: Mapped[str] = mapped_column(String(255), nullable=False)
    source_type: Mapped[str] = mapped_column(
        Enum("national_standard", "department_expert", "exam_requirement", "clinical_guideline", "humanistic_care", "other"),
        nullable=False,
        index=True,
    )
    authority_level: Mapped[int] = mapped_column(Integer, default=1)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)


class KnowledgeDocument(TimestampMixin, Base):
    """知识文档模型：保存知识来源下的具体文档元数据。"""

    __tablename__ = "knowledge_documents"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    source_id: Mapped[int] = mapped_column(ForeignKey("knowledge_sources.id"), nullable=False, index=True)
    department_id: Mapped[int | None] = mapped_column(ForeignKey("department.id"), nullable=True, index=True)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    task_type: Mapped[str | None] = mapped_column(String(64), index=True)
    summary: Mapped[str | None] = mapped_column(Text)
    file_path: Mapped[str | None] = mapped_column(String(512))
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)

    source = relationship("KnowledgeSource")


class KnowledgeChunk(Base):
    """知识片段模型：保存评分前检索和拼接使用的指南片段。"""

    __tablename__ = "knowledge_chunks"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    document_id: Mapped[int] = mapped_column(ForeignKey("knowledge_documents.id"), nullable=False, index=True)
    department_id: Mapped[int | None] = mapped_column(ForeignKey("department.id"), nullable=True, index=True)
    task_type: Mapped[str | None] = mapped_column(String(64), index=True)
    chunk_text: Mapped[str] = mapped_column(Text, nullable=False)
    keywords: Mapped[list | None] = mapped_column(JSON)
    weight: Mapped[float] = mapped_column(default=1.0)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)

    document = relationship("KnowledgeDocument")