"""SQLAlchemy 2.x ORM models,对应 DESIGN.md §7.4 schema。

4 张表:users / tasks / messages / invites。
- users 行在 web 入口(`/v1/auth/login*`)按需 INSERT;user_id 由 invite name uuid5 推导 或 platform 直传
- messages.payload 用 jsonb,GIN 索引在 migration 里建
- run 状态承载在 tasks.run_status / run_error 两列(0004 合并 runs 表);
  原 runs / usage_events 表 0004 删 — 详 DESIGN §7.4 取舍 / PROGRESS 05-18
- invites 0005 加(token PK / name UNIQUE / created_at):dev SPA 邀请码登录后端
"""
from __future__ import annotations

from datetime import datetime
from decimal import Decimal
from typing import Any, Optional
from uuid import UUID, uuid4

from sqlalchemy import (
    DateTime,
    ForeignKey,
    Integer,
    Numeric,
    Text,
    UniqueConstraint,
    func,
)
from sqlalchemy.dialects.postgresql import JSONB, UUID as PG_UUID
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column


class Base(DeclarativeBase):
    pass


class User(Base):
    __tablename__ = "users"

    user_id: Mapped[UUID] = mapped_column(PG_UUID(as_uuid=True), primary_key=True, default=uuid4)
    email: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    oidc_subject: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    password_hash: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    plan: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )


class Task(Base):
    __tablename__ = "tasks"

    task_id: Mapped[UUID] = mapped_column(PG_UUID(as_uuid=True), primary_key=True, default=uuid4)
    user_id: Mapped[UUID] = mapped_column(
        PG_UUID(as_uuid=True), ForeignKey("users.user_id"), nullable=False
    )
    name: Mapped[str] = mapped_column(Text, nullable=False)
    working_dir: Mapped[str] = mapped_column(Text, nullable=False)
    skill: Mapped[str] = mapped_column(Text, nullable=False, default="")
    description: Mapped[str] = mapped_column(Text, nullable=False, default="")
    status: Mapped[str] = mapped_column(Text, nullable=False, default="active")
    model: Mapped[str] = mapped_column(Text, nullable=False, default="")
    model_profile: Mapped[str] = mapped_column(Text, nullable=False, default="")
    reasoning_effort: Mapped[str] = mapped_column(Text, nullable=False, default="")
    tokens_prompt: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    tokens_completion: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    cost_usd: Mapped[Decimal] = mapped_column(Numeric(12, 6), nullable=False, default=0)
    # 当前 in-flight 状态(原 runs 表合并入,DESIGN §7.4 简化 / 0004 migration):
    # idle / running / cancelling / error;ok / cancelled 收尾直接回 idle,
    # 只有 error 是持久终态(下次起新 run 时由 post_message 清掉)
    run_status: Mapped[str] = mapped_column(Text, nullable=False, default="idle")
    run_error: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
    )


class Message(Base):
    __tablename__ = "messages"
    __table_args__ = (UniqueConstraint("task_id", "idx", name="uq_messages_task_idx"),)

    message_id: Mapped[UUID] = mapped_column(PG_UUID(as_uuid=True), primary_key=True, default=uuid4)
    task_id: Mapped[UUID] = mapped_column(
        PG_UUID(as_uuid=True),
        ForeignKey("tasks.task_id", ondelete="CASCADE"),
        nullable=False,
    )
    idx: Mapped[int] = mapped_column(Integer, nullable=False)
    payload: Mapped[dict[str, Any]] = mapped_column(JSONB, nullable=False)
    tokens_in: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    tokens_out: Mapped[Optional[int]] = mapped_column(Integer, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )


class Invite(Base):
    """dev SPA 邀请码登录后端表(0005)。

    token 是 lookup 入口(PK);name 是显示名 + uuid5(NS, name) → user_id 推导源
    (UNIQUE 防同名 = 两 token 共身份);created_at 给审计。
    管理:目前直接在 DB 里 INSERT/DELETE(`python main.py invite ...` 后续若需要再加)。
    """
    __tablename__ = "invites"

    token: Mapped[str] = mapped_column(Text, primary_key=True)
    name: Mapped[str] = mapped_column(Text, nullable=False, unique=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )