"""大周天抽取候选审核服务（记忆候选 + 世界实体候选）。

记忆候选 approve 派生为 ``memories``（source=big_cycle）；世界实体候选 approve
→ confirmed 进入世界模型。审核仅 pending 可操作（见 [大周天记忆/世界抽取落地设计]
../docs/domain/core-domains.md §5）。
"""

from app.core.errors import AppError
from app.core.time import utc_now
from app.db.session import AsyncSessionLocal
from app.models.memory import Memory
from app.repositories import candidates as candidates_repo
from app.repositories import world as world_repo
from app.schemas.candidates import MemoryCandidateResponse
from app.schemas.common import Page
from app.schemas.world import WorldEntityResponse
from app.services.audit import record_audit_event
from app.services.serializers import (
    character_world_entity_to_response,
    memory_candidate_to_response,
)


async def list_memory_proposals(
    *,
    character_id: str,
    source: str | None = None,
    status: str | None = None,
    page: int = 1,
    page_size: int = 20,
) -> Page[MemoryCandidateResponse]:
    async with AsyncSessionLocal() as session:
        all_items = await candidates_repo.list_memory_candidates(
            session, character_id, source=source, status=status
        )
    start = max(page - 1, 0) * page_size
    items = all_items[start : start + page_size]
    return Page(
        items=[memory_candidate_to_response(i) for i in items],
        page=page,
        page_size=page_size,
        total=len(all_items),
    )


async def approve_memory_proposal(
    candidate_id: str,
) -> MemoryCandidateResponse:
    async with AsyncSessionLocal() as session:
        candidate = await candidates_repo.get_memory_candidate(session, candidate_id)
        if candidate is None:
            raise AppError("not_found", "记忆候选不存在。")
        if candidate.status != "pending":
            raise AppError("conflict", f"候选当前状态为 {candidate.status}，不可审核。")
        session.add(
            Memory(
                character_id=candidate.character_id,
                type=candidate.type,
                title=candidate.title,
                content=candidate.content,
                source="big_cycle",
                confidence=candidate.confidence,
                importance=candidate.importance,
                sensitivity=candidate.sensitivity,
                evidence_ids_json=candidate.evidence_ids_json,
                status="active",
            )
        )
        candidate.status = "applied"
        candidate.reviewed_at = utc_now()
        await record_audit_event(
            session,
            action="extraction.memory.applied",
            actor="user",
            character_id=candidate.character_id,
            input_summary=candidate.title[:200],
            resource_type="memory_candidate",
            resource_id=candidate.id,
        )
        await session.commit()
        await session.refresh(candidate)
        return memory_candidate_to_response(candidate)


async def reject_memory_proposal(
    candidate_id: str,
) -> MemoryCandidateResponse:
    return await _reject_memory(candidate_id)


async def list_world_entities_pending(
    *,
    character_id: str,
    status: str | None = None,
    page: int = 1,
    page_size: int = 20,
) -> Page[WorldEntityResponse]:
    async with AsyncSessionLocal() as session:
        items, total = await world_repo.list_entities(
            session, character_id, status=status, page=page, page_size=page_size
        )
        return Page(
            items=[character_world_entity_to_response(i) for i in items],
            page=page,
            page_size=page_size,
            total=total,
        )


async def approve_world_entity(entity_id: str) -> WorldEntityResponse:
    return await _review_world_entity(entity_id, "confirmed", decision="auto")


async def reject_world_entity(entity_id: str) -> WorldEntityResponse:
    return await _review_world_entity(entity_id, "rejected", decision="denied")


async def _reject_memory(candidate_id: str) -> MemoryCandidateResponse:
    async with AsyncSessionLocal() as session:
        candidate = await candidates_repo.get_memory_candidate(session, candidate_id)
        if candidate is None:
            raise AppError("not_found", "记忆候选不存在。")
        if candidate.status != "pending":
            raise AppError("conflict", f"候选当前状态为 {candidate.status}，不可审核。")
        candidate.status = "rejected"
        candidate.reviewed_at = utc_now()
        await record_audit_event(
            session,
            action="extraction.memory.rejected",
            actor="user",
            decision="denied",
            character_id=candidate.character_id,
            input_summary=candidate.title[:200],
            resource_type="memory_candidate",
            resource_id=candidate.id,
        )
        await session.commit()
        await session.refresh(candidate)
        return memory_candidate_to_response(candidate)


async def _review_world_entity(
    entity_id: str, target_status: str, *, decision: str
) -> WorldEntityResponse:
    async with AsyncSessionLocal() as session:
        entity = await world_repo.get_entity(session, entity_id)
        if entity is None:
            raise AppError("not_found", "世界实体不存在。")
        if entity.status != "pending":
            raise AppError("conflict", f"实体当前状态为 {entity.status}，不可审核。")
        entity.status = target_status
        await record_audit_event(
            session,
            action=f"extraction.world.{target_status}",
            actor="user",
            decision=decision,
            character_id=entity.character_id,
            input_summary=entity.name[:200],
            resource_type="character_world_entity",
            resource_id=entity.id,
        )
        await session.commit()
        await session.refresh(entity)
        return character_world_entity_to_response(entity)