"""内驱力数据访问（好奇问题 + 探索性次生目标）。"""

from sqlalchemy import func, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.drive import CuriosityQuestion, ExploratorySubgoal


async def add_curiosities(session: AsyncSession, curiosities: list[CuriosityQuestion]) -> None:
    session.add_all(curiosities)
    await session.flush()


async def get_curiosity(session: AsyncSession, curiosity_id: str) -> CuriosityQuestion | None:
    return await session.get(CuriosityQuestion, curiosity_id)


async def list_curiosities(
    session: AsyncSession,
    character_id: str,
    *,
    source: str | None = None,
    page: int = 1,
    page_size: int = 20,
) -> tuple[list[CuriosityQuestion], int]:
    conditions = [CuriosityQuestion.character_id == character_id]
    if source is not None:
        conditions.append(CuriosityQuestion.source == source)
    total = (
        await session.execute(
            select(func.count()).select_from(CuriosityQuestion).where(*conditions)
        )
    ).scalar_one()
    items = await session.execute(
        select(CuriosityQuestion)
        .where(*conditions)
        .order_by(CuriosityQuestion.created_at.desc())
        .offset(max(page - 1, 0) * page_size)
        .limit(page_size)
    )
    return list(items.scalars().all()), int(total or 0)


async def add_subgoals(session: AsyncSession, subgoals: list[ExploratorySubgoal]) -> None:
    session.add_all(subgoals)
    await session.flush()


async def get_subgoal(session: AsyncSession, subgoal_id: str) -> ExploratorySubgoal | None:
    return await session.get(ExploratorySubgoal, subgoal_id)


async def list_subgoals(
    session: AsyncSession,
    character_id: str,
    *,
    status: str | None = None,
    page: int = 1,
    page_size: int = 20,
) -> tuple[list[ExploratorySubgoal], int]:
    conditions = [ExploratorySubgoal.character_id == character_id]
    if status is not None:
        conditions.append(ExploratorySubgoal.status == status)
    total = (
        await session.execute(
            select(func.count()).select_from(ExploratorySubgoal).where(*conditions)
        )
    ).scalar_one()
    items = await session.execute(
        select(ExploratorySubgoal)
        .where(*conditions)
        .order_by(ExploratorySubgoal.created_at.desc())
        .offset(max(page - 1, 0) * page_size)
        .limit(page_size)
    )
    return list(items.scalars().all()), int(total or 0)


async def list_approved_subgoals(
    session: AsyncSession,
    character_id: str,
    limit: int = 5,
) -> list[ExploratorySubgoal]:
    """列出已批准（approved）的次生目标，按 created_at 升序排列。

    供大周天自主探索执行阶段拾取。
    """
    result = await session.execute(
        select(ExploratorySubgoal)
        .where(
            ExploratorySubgoal.character_id == character_id,
            ExploratorySubgoal.status == "approved",
        )
        .order_by(ExploratorySubgoal.created_at.asc())
        .limit(limit)
    )
    return list(result.scalars().all())