"""镜生域模型：灵胚、执镜关系、命台、魂籍（data-model.md §1）。

- 灵胚只有预备身份，启镜（activate）才产生正式人物与执镜关系；
- 命台人物粒度唯一（UNIQUE(character_id)），租约到期可被接管，epoch 递增；
- 魂籍版本不可变（UNIQUE(character_id, version)），签名绑定人物与版本。
"""

from datetime import datetime

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

from app.core.ids import new_custodianship_id, new_embryo_id, new_id, new_identity_record_id, new_seat_id
from app.core.time import utc_now
from app.db.base import Base


class EmbryoDraft(Base):
    """灵胚：启镜前的可审阅草稿。放弃灵胚是删除草稿，不是人物死亡。"""

    __tablename__ = "embryo_drafts"

    id: Mapped[str] = mapped_column(String(80), primary_key=True, default=new_embryo_id)
    owner_scope: Mapped[str] = mapped_column(String(80), nullable=False, index=True)
    # drafting / previewing / confirming / activated / abandoned
    status: Mapped[str] = mapped_column(String(40), nullable=False, default="drafting", index=True)
    # original / adopted / imported / serendipity
    source: Mapped[str] = mapped_column(String(40), nullable=False, default="original")
    name: Mapped[str] = mapped_column(String(120), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    identity_baseline_json: Mapped[str] = mapped_column(Text, nullable=False, default="{}")
    # 照心试演引用：[{run_id, prompt, performed_at}]，内容在事件日志，不入正式经历
    rehearsals_json: Mapped[str] = mapped_column(Text, nullable=False, default="[]")
    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
    )


class Custodianship(Base):
    """执镜关系：治理责任（1.0 一对一），与缘契（covenants）严格分离。"""

    __tablename__ = "custodianships"

    id: Mapped[str] = mapped_column(String(80), primary_key=True, default=new_custodianship_id)
    character_id: Mapped[str] = mapped_column(
        String(80), ForeignKey("characters.id"), nullable=False, unique=True, index=True
    )
    custodian_scope: Mapped[str] = mapped_column(String(80), nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utc_now)


class RuntimeSeat(Base):
    """命台：人物唯一权威运行位置；holder 持有租约，过期可接管，epoch 每次获取递增。"""

    __tablename__ = "runtime_seats"

    id: Mapped[str] = mapped_column(String(80), primary_key=True, default=new_seat_id)
    character_id: Mapped[str] = mapped_column(
        String(80), ForeignKey("characters.id"), nullable=False, unique=True, index=True
    )
    epoch: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
    holder: Mapped[str | None] = mapped_column(String(120))
    lease_expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=utc_now, onupdate=utc_now
    )


class IdentityRecord(Base):
    """魂籍：可验证、版本化的身份与状态包。版本不可变；复制不能凭相同 ID 冒充原人物。"""

    __tablename__ = "identity_records"
    __table_args__ = (UniqueConstraint("character_id", "version", name="uq_identity_char_version"),)

    id: Mapped[str] = mapped_column(String(80), primary_key=True, default=new_identity_record_id)
    character_id: Mapped[str] = mapped_column(
        String(80), ForeignKey("characters.id"), nullable=False, index=True
    )
    version: Mapped[int] = mapped_column(Integer, nullable=False)
    payload_json: Mapped[str] = mapped_column(Text, nullable=False)
    digest: Mapped[str] = mapped_column(String(64), nullable=False)
    signature: Mapped[str] = mapped_column(String(128), nullable=False)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utc_now)


class SoulForging(Base):
    """铸魂提案：道体锚点重大变更必须走确认流（identity-continuity.md §3）。

    pending → confirmed（应用锚点 + 签发新魂籍版本）/ rejected；
    确认前人物锚点不变——日常对话、模型输出、普通工具不可静默覆盖。
    """

    __tablename__ = "soul_forgings"

    id: Mapped[str] = mapped_column(String(80), primary_key=True, default=lambda: new_id("forge"))
    character_id: Mapped[str] = mapped_column(
        String(80), ForeignKey("characters.id"), nullable=False, index=True
    )
    proposed_anchor_json: Mapped[str] = mapped_column(Text, nullable=False)
    reason: Mapped[str] = mapped_column(Text, nullable=False, default="")
    # pending / confirmed / rejected
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="pending", index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=utc_now)
    confirmed_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))