"""数据表定义(SQLAlchemy 2.0)。

两张表,职责分离(见设计):
  - ProviderCredential:模型凭证(key 明文存,同 dograh,靠 DB 访问控制兜底;读时打码)
  - Assistant:助手配置,**只存模型/音色的"选项名",不嵌 key**

助手运行时再用 kind 去 ProviderCredential 取真 key(services/config_resolver.py)。
"""

from datetime import datetime

from sqlalchemy import JSON, Boolean, DateTime, ForeignKey, String, func
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column


class Base(DeclarativeBase):
    pass


class ProviderCredential(Base):
    """模型资源凭证。字段对齐前端 ComponentsModelsPage 的 ModelResource。"""

    __tablename__ = "provider_credentials"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)   # model_xxx
    name: Mapped[str] = mapped_column(String(128), default="")      # 资源名称,如 "DeepSeek-V3"
    model_id: Mapped[str] = mapped_column(String(128), default="")  # 模型ID,如 "deepseek-chat"
    type: Mapped[str] = mapped_column(String(16), index=True)       # LLM|ASR|TTS|Realtime|Embedding
    interface_type: Mapped[str] = mapped_column(String(32), default="openai")  # openai|xfyun|dashscope|gemini
    api_url: Mapped[str] = mapped_column(String(512), default="")
    api_key: Mapped[str] = mapped_column(String(512), default="")   # 明文
    # 同一 type 下的默认凭证(后端解析用;前端 ModelResource 无此字段,留作可选)
    is_default: Mapped[bool] = mapped_column(Boolean, default=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )


class KnowledgeBase(Base):
    """知识库注册表。本身引用一个 Embedding 凭证(用哪个向量模型)。

    文档/分块(pgvector)是 KB 内部实现,这里先不展开;助手侧只认 knowledge_base_id。
    """

    __tablename__ = "knowledge_bases"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)  # kb_xxx
    name: Mapped[str] = mapped_column(String(128))
    description: Mapped[str] = mapped_column(String(2048), default="")
    # 该 KB 用哪个向量模型;凭证被删则置空
    embedding_credential_id: Mapped[str | None] = mapped_column(
        String(40),
        ForeignKey("provider_credentials.id", ondelete="SET NULL"),
        nullable=True,
    )
    status: Mapped[str] = mapped_column(String(16), default="active")  # active|archived
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )


class Assistant(Base):
    """助手(单表,无版本化)。type 为可变普通列,5 种类型共用此表。

    模型/KB 以 FK 引用注册表;类型专属字段塞进 config(JSON)。
    """

    __tablename__ = "assistants"

    id: Mapped[str] = mapped_column(String(40), primary_key=True)  # asst_xxx
    name: Mapped[str] = mapped_column(String(128))
    # prompt|workflow|dify|fastgpt|opencode;创建后可改
    type: Mapped[str] = mapped_column(String(16), index=True, default="prompt")
    runtime_mode: Mapped[str] = mapped_column(String(16), default="pipeline")
    greeting: Mapped[str] = mapped_column(String(2048), default="")
    enable_interrupt: Mapped[bool] = mapped_column(Boolean, default=True)

    # ---- 引用"注册好的资源":凭证被删 → SET NULL(resolver 有默认/.env 兜底) ----
    llm_credential_id: Mapped[str | None] = mapped_column(
        String(40), ForeignKey("provider_credentials.id", ondelete="SET NULL"), nullable=True
    )
    asr_credential_id: Mapped[str | None] = mapped_column(
        String(40), ForeignKey("provider_credentials.id", ondelete="SET NULL"), nullable=True
    )
    tts_credential_id: Mapped[str | None] = mapped_column(
        String(40), ForeignKey("provider_credentials.id", ondelete="SET NULL"), nullable=True
    )
    realtime_credential_id: Mapped[str | None] = mapped_column(
        String(40), ForeignKey("provider_credentials.id", ondelete="SET NULL"), nullable=True
    )
    # KB 引用:被引用时禁止删 KB(RESTRICT),无默认兜底
    knowledge_base_id: Mapped[str | None] = mapped_column(
        String(40), ForeignKey("knowledge_bases.id", ondelete="RESTRICT"), nullable=True
    )

    # ---- 瘦类型专属字段(真列,稀疏:按 type 用其中几列) ----
    prompt: Mapped[str] = mapped_column(String(8192), default="")    # prompt / opencode
    api_url: Mapped[str] = mapped_column(String(512), default="")    # dify / fastgpt / opencode
    api_key: Mapped[str] = mapped_column(String(512), default="")    # dify / fastgpt / opencode(打码/哨兵,同凭证)
    app_id: Mapped[str] = mapped_column(String(128), default="")     # fastgpt
    # workflow 专属:图(nodes/edges)。要版本化时再迁出到 assistant_workflow 表
    graph: Mapped[dict] = mapped_column(JSON, default=dict)

    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now()
    )