"""Repository for formal risk assessments and internal profile projections."""

from datetime import datetime
from typing import cast

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

from app.model.fund import FundRiskAssessment as RiskAssessment
from app.model.memory import MemorySyncOutbox
from app.model.profile_tag import AdvisorProfileDriftReview, AdvisorProfileTag
from app.model.risk_questionnaire import ProfileSnapshot


class RiskQuestionnaireRepository:
    def __init__(self, session: AsyncSession) -> None:
        self.session = session

    async def has_valid_assessment(self, customer_id: int, now: datetime) -> bool:
        return await self.session.scalar(
            select(RiskAssessment.id)
            .where(RiskAssessment.customer_id == customer_id, RiskAssessment.valid_until > now)
            .limit(1)
        ) is not None

    async def assessments_since(self, customer_id: int, since: datetime) -> int:
        value = await self.session.scalar(
            select(func.count())
            .select_from(RiskAssessment)
            .where(RiskAssessment.customer_id == customer_id, RiskAssessment.assessed_at >= since)
        )
        return int(value or 0)

    async def next_profile_version(self, customer_id: int) -> int:
        value = await self.session.scalar(
            select(func.coalesce(func.max(ProfileSnapshot.version), 0)).where(
                ProfileSnapshot.customer_id == customer_id
            )
        )
        return int(value or 0) + 1

    async def deactivate_current_profile(self, customer_id: int, now: datetime) -> None:
        await self.session.execute(
            update(ProfileSnapshot)
            .where(ProfileSnapshot.customer_id == customer_id, ProfileSnapshot.is_current.is_(True))
            .values(is_current=False, updated_at=now)
        )

    def add_assessment(self, assessment: RiskAssessment) -> None:
        self.session.add(assessment)

    def add_profile(self, profile: ProfileSnapshot) -> None:
        self.session.add(profile)

    def add_sync_event(self, event: MemorySyncOutbox) -> None:
        self.session.add(event)

    async def latest_assessment(self, customer_id: int) -> RiskAssessment | None:
        return cast(RiskAssessment | None, await self.session.scalar(
            select(RiskAssessment)
            .where(RiskAssessment.customer_id == customer_id)
            .order_by(RiskAssessment.assessed_at.desc(), RiskAssessment.id.desc())
            .limit(1)
        ))

    async def current_profile(self, customer_id: int) -> ProfileSnapshot | None:
        return cast(ProfileSnapshot | None, await self.session.scalar(
            select(ProfileSnapshot)
            .where(
                ProfileSnapshot.customer_id == customer_id,
                ProfileSnapshot.is_current.is_(True),
            )
            .order_by(ProfileSnapshot.version.desc(), ProfileSnapshot.id.desc())
            .limit(1)
        ))

    async def active_tags(
        self, customer_id: int, *, lock: bool = False
    ) -> list[AdvisorProfileTag]:
        statement = (
            select(AdvisorProfileTag)
            .where(
                AdvisorProfileTag.customer_id == customer_id,
                AdvisorProfileTag.status == "active",
            )
            .order_by(AdvisorProfileTag.tag_key.asc(), AdvisorProfileTag.id.desc())
        )
        if lock:
            statement = statement.with_for_update()
        return list(await self.session.scalars(statement))

    async def tags(self, customer_id: int, *, limit: int = 100) -> list[AdvisorProfileTag]:
        return list(await self.session.scalars(
            select(AdvisorProfileTag)
            .where(AdvisorProfileTag.customer_id == customer_id)
            .order_by(AdvisorProfileTag.tag_key.asc(), AdvisorProfileTag.id.desc())
            .limit(limit)
        ))

    async def pending_drift_review(
        self, customer_id: int, *, lock: bool = False
    ) -> AdvisorProfileDriftReview | None:
        statement = (
            select(AdvisorProfileDriftReview)
            .where(
                AdvisorProfileDriftReview.customer_id == customer_id,
                AdvisorProfileDriftReview.status == "pending_review",
            )
            .order_by(
                AdvisorProfileDriftReview.created_at.desc(),
                AdvisorProfileDriftReview.id.desc(),
            )
            .limit(1)
        )
        if lock:
            statement = statement.with_for_update()
        return cast(AdvisorProfileDriftReview | None, await self.session.scalar(statement))

    async def drift_review(
        self, review_id: int, *, lock: bool = False
    ) -> AdvisorProfileDriftReview | None:
        statement = select(AdvisorProfileDriftReview).where(
            AdvisorProfileDriftReview.id == review_id
        )
        if lock:
            statement = statement.with_for_update()
        return cast(AdvisorProfileDriftReview | None, await self.session.scalar(statement))

    async def pending_reviews(self, *, limit: int) -> list[AdvisorProfileDriftReview]:
        return list(await self.session.scalars(
            select(AdvisorProfileDriftReview)
            .where(AdvisorProfileDriftReview.status == "pending_review")
            .order_by(
                AdvisorProfileDriftReview.created_at.asc(),
                AdvisorProfileDriftReview.id.asc(),
            )
            .limit(limit)
        ))

    async def tags_for_review(
        self, review_id: int, *, lock: bool = False
    ) -> list[AdvisorProfileTag]:
        statement = (
            select(AdvisorProfileTag)
            .where(AdvisorProfileTag.drift_review_id == review_id)
            .order_by(AdvisorProfileTag.tag_key.asc(), AdvisorProfileTag.id.asc())
        )
        if lock:
            statement = statement.with_for_update()
        return list(await self.session.scalars(statement))

    async def supersede_active_tags(
        self, customer_id: int, tag_keys: tuple[str, ...], now: datetime
    ) -> None:
        if not tag_keys:
            return
        await self.session.execute(
            update(AdvisorProfileTag)
            .where(
                AdvisorProfileTag.customer_id == customer_id,
                AdvisorProfileTag.tag_key.in_(tag_keys),
                AdvisorProfileTag.status == "active",
            )
            .values(status="superseded", active_customer_tag=None, updated_at=now)
        )

    def add_tag(self, tag: AdvisorProfileTag) -> None:
        self.session.add(tag)

    def add_drift_review(self, review: AdvisorProfileDriftReview) -> None:
        self.session.add(review)