"""记忆模型。"""

from datetime import datetime

from sqlalchemy import DateTime, Float, ForeignKey, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.core.ids import new_memory_id, new_memory_link_id
from app.core.time import utc_now
from app.db.base import Base


class Memory(Base):
    __tablename__ = "memories"

    id: Mapped[str] = mapped_column(String(80), primary_key=True, default=new_memory_id)
    character_id: Mapped[str] = mapped_column(String(80), ForeignKey("characters.id"), index=True)
    type: Mapped[str] = mapped_column(String(60), nullable=False)
    title: Mapped[str] = mapped_column(String(200), nullable=False)
    content: Mapped[str] = mapped_column(Text, nullable=False)
    source: Mapped[str] = mapped_column(String(80), nullable=False, default="user_explicit")
    confidence: Mapped[float] = mapped_column(Float, nullable=False, default=1.0)
    importance: Mapped[float] = mapped_column(Float, nullable=False, default=0.5)
    sensitivity: Mapped[str] = mapped_column(String(40), nullable=False, default="low")
    evidence_ids_json: Mapped[str] = mapped_column(Text, nullable=False, default="[]")
    status: Mapped[str] = mapped_column(String(40), nullable=False, default="active", index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utc_now)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=utc_now, onupdate=utc_now
    )
    deleted_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    temporal_context_json: Mapped[str] = mapped_column(
        Text, nullable=False, default="{}", server_default="{}"
    )


class MemoryLink(Base):
    __tablename__ = "memory_links"

    id: Mapped[str] = mapped_column(String(80), primary_key=True, default=new_memory_link_id)
    character_id: Mapped[str] = mapped_column(String(80), ForeignKey("characters.id"), index=True)
    source_memory_id: Mapped[str] = mapped_column(String(80), ForeignKey("memories.id"), index=True)
    target_memory_id: Mapped[str] = mapped_column(String(80), ForeignKey("memories.id"), index=True)
    relation: Mapped[str] = mapped_column(String(80), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utc_now)