from datetime import datetime

from sqlalchemy import JSON, DateTime, ForeignKey, Integer, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.core.constants import ActorValue
from app.core.database import Base
from app.core.utils.time import utc_now
from app.modules.feishu_users.models import FeishuUser
from app.modules.ai_memory.constants import (
    AIMemoryKind,
    AIMemoryScope,
    AIMemorySource,
    AIMemoryStatus,
)


class AIMemoryEntry(Base):
    __tablename__ = "ai_memory_entries"
    __table_args__ = (
        UniqueConstraint(
            "owner_id",
            "fingerprint",
            name="uq_ai_memory_owner_fingerprint",
        ),
    )

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    code: Mapped[str] = mapped_column(String(64), unique=True, index=True)
    fingerprint: Mapped[str | None] = mapped_column(
        String(64), nullable=True, index=True
    )
    owner_id: Mapped[int | None] = mapped_column(
        ForeignKey("feishu_users.id", ondelete="CASCADE"),
        nullable=True,
        index=True,
    )
    owner: Mapped[FeishuUser | None] = relationship()
    kind: Mapped[str] = mapped_column(
        String(32),
        default=AIMemoryKind.MEMORY,
        index=True,
    )
    scope: Mapped[str] = mapped_column(String(64), default=AIMemoryScope.GLOBAL, index=True)
    subject: Mapped[str] = mapped_column(String(128), index=True)
    content: Mapped[str] = mapped_column(Text)
    summary: Mapped[str | None] = mapped_column(Text, nullable=True)
    tags: Mapped[list | None] = mapped_column(JSON, nullable=True)
    source: Mapped[str] = mapped_column(String(64), default=AIMemorySource.AUTO, index=True)
    importance: Mapped[int] = mapped_column(Integer, default=1, index=True)
    status: Mapped[str] = mapped_column(String(32), default=AIMemoryStatus.ACTIVE, index=True)
    actor: Mapped[str] = mapped_column(String(128), default=ActorValue.SYSTEM, index=True)
    last_used_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True, index=True)
    expires_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=utc_now, index=True)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime,
        default=utc_now,
        onupdate=utc_now,
    )