"""Campaign reads + writes.

Campaign = the second-tier clustering output that groups multiple
``AttackerIdentity`` rows into a coordinated activity cluster.  The
campaign-clusterer worker drives the writes; the dashboard drives
the reads.
"""
from __future__ import annotations

from datetime import datetime, timezone
from typing import Any, Optional

from sqlalchemy import desc, func, select, update

from decnet.web.db.models import AttackerIdentity, Campaign


class CampaignsMixin:
    """Mixin: composed onto ``SQLModelRepository``."""

    async def get_campaign_by_uuid(self, uuid: str) -> Optional[dict[str, Any]]:
        # Same chain-walk as get_identity_by_uuid; bounded against
        # corrupted rings.
        _MAX_MERGE_HOPS = 8
        async with self._session() as session:
            current_uuid = uuid
            for _ in range(_MAX_MERGE_HOPS):
                result = await session.execute(
                    select(Campaign).where(Campaign.uuid == current_uuid)
                )
                campaign = result.scalar_one_or_none()
                if campaign is None:
                    return None
                if campaign.merged_into_uuid is None:
                    return campaign.model_dump(mode="json")
                current_uuid = campaign.merged_into_uuid
            return campaign.model_dump(mode="json")

    async def list_campaigns(
        self, limit: int = 50, offset: int = 0,
    ) -> list[dict[str, Any]]:
        statement = (
            select(Campaign)
            .where(Campaign.merged_into_uuid.is_(None))
            .order_by(desc(Campaign.updated_at))
            .offset(offset)
            .limit(limit)
        )
        async with self._session() as session:
            result = await session.execute(statement)
            return [c.model_dump(mode="json") for c in result.scalars().all()]

    async def count_campaigns(self) -> int:
        statement = (
            select(func.count())
            .select_from(Campaign)
            .where(Campaign.merged_into_uuid.is_(None))
        )
        async with self._session() as session:
            result = await session.execute(statement)
            return result.scalar() or 0

    async def list_identities_for_campaign(
        self, campaign_uuid: str, limit: int = 50, offset: int = 0,
    ) -> list[dict[str, Any]]:
        statement = (
            select(AttackerIdentity)
            .where(AttackerIdentity.campaign_id == campaign_uuid)
            .order_by(desc(AttackerIdentity.updated_at))
            .offset(offset)
            .limit(limit)
        )
        async with self._session() as session:
            result = await session.execute(statement)
            return [i.model_dump(mode="json") for i in result.scalars().all()]

    async def count_identities_for_campaign(self, campaign_uuid: str) -> int:
        statement = (
            select(func.count())
            .select_from(AttackerIdentity)
            .where(AttackerIdentity.campaign_id == campaign_uuid)
        )
        async with self._session() as session:
            result = await session.execute(statement)
            return result.scalar() or 0

    async def list_identities_for_clustering(
        self, limit: Optional[int] = None,
    ) -> list[dict[str, Any]]:
        # Project the columns the campaign clusterer's similarity
        # graph reads. Narrow on purpose — future denormalised
        # projections (commands_by_phase from log mining, decky-set
        # aggregates) can land here without churning callers.
        statement = select(
            AttackerIdentity.uuid,
            AttackerIdentity.campaign_id,
            AttackerIdentity.merged_into_uuid,
            AttackerIdentity.first_seen_at,
            AttackerIdentity.last_seen_at,
            AttackerIdentity.ja3_hashes,
            AttackerIdentity.hassh_hashes,
            AttackerIdentity.payload_simhashes,
            AttackerIdentity.c2_endpoints,
        ).order_by(AttackerIdentity.created_at)
        if limit is not None:
            statement = statement.limit(limit)
        async with self._session() as session:
            result = await session.execute(statement)
            return [
                {
                    "uuid": row.uuid,
                    "campaign_id": row.campaign_id,
                    "merged_into_uuid": row.merged_into_uuid,
                    "first_seen_at": (
                        row.first_seen_at.isoformat()
                        if row.first_seen_at is not None
                        else None
                    ),
                    "last_seen_at": (
                        row.last_seen_at.isoformat()
                        if row.last_seen_at is not None
                        else None
                    ),
                    "ja3_hashes": row.ja3_hashes,
                    "hassh_hashes": row.hassh_hashes,
                    "payload_simhashes": row.payload_simhashes,
                    "c2_endpoints": row.c2_endpoints,
                }
                for row in result.all()
            ]

    async def create_campaign(self, row: dict[str, Any]) -> str:
        campaign = Campaign(**row)
        async with self._session() as session:
            session.add(campaign)
            await session.commit()
        return campaign.uuid

    async def set_identity_campaign_id(
        self, identity_uuid: str, campaign_uuid: Optional[str],
    ) -> None:
        statement = (
            update(AttackerIdentity)
            .where(AttackerIdentity.uuid == identity_uuid)
            .values(
                campaign_id=campaign_uuid,
                updated_at=datetime.now(timezone.utc),
            )
        )
        async with self._session() as session:
            await session.execute(statement)
            await session.commit()

    async def list_all_campaigns(self) -> list[dict[str, Any]]:
        statement = select(Campaign).order_by(Campaign.created_at)
        async with self._session() as session:
            result = await session.execute(statement)
            return [c.model_dump(mode="json") for c in result.scalars().all()]

    async def update_campaign_merged_into(
        self, campaign_uuid: str, winner_uuid: Optional[str],
    ) -> None:
        statement = (
            update(Campaign)
            .where(Campaign.uuid == campaign_uuid)
            .values(
                merged_into_uuid=winner_uuid,
                updated_at=datetime.now(timezone.utc),
            )
        )
        async with self._session() as session:
            await session.execute(statement)
            await session.commit()