"""息壤（记忆域）API（api-contracts §3.5）。"""

from __future__ import annotations

import json

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel, Field
from sqlalchemy import select

from app.api.v1.deps import get_current_user
from app.core.errors import AppError
from app.db.session import AsyncSessionLocal
from app.domains import xirang
from app.models.character import Character
from app.models.xirang import FactualRecord, Memory
from app.schemas.auth import CurrentUser

router = APIRouter(tags=["xirang"])


class MemorizeRequest(BaseModel):
    label: str = Field(description="fact / insight / opinion / hypothesis")


class CorrectRequest(BaseModel):
    new_content: str = Field(min_length=1, max_length=8000)


def _memory_view(m: Memory, with_content: bool = True) -> dict:
    return {
        "id": m.id,
        "character_id": m.character_id,
        "tier": m.tier,
        "type": m.type,
        "status": m.status,
        "source": m.source,
        "content": m.content if with_content else "",
        "source_refs": json.loads(m.source_refs_json or "[]"),
        "sensitivity": m.sensitivity,
        "priority": m.priority,
        "confidence": m.confidence,
        "vitality": round(m.vitality, 3),
        "realm": m.realm,
        "prev_version_id": m.prev_version_id,
        "recall_count": m.recall_count,
        "last_recalled_at": m.last_recalled_at.isoformat() if m.last_recalled_at else None,
        "created_at": m.created_at.isoformat(),
    }


async def _owned_character(character_id: str, owner_scope: str) -> Character:
    async with AsyncSessionLocal() as session:
        character = await session.get(Character, character_id)
    if character is None or character.owner_scope != owner_scope:
        raise AppError("not_found", "人物不存在。")
    return character


@router.get("/characters/{character_id}/memories")
async def list_memories(
    character_id: str,
    tier: str | None = Query(default=None),
    status: str | None = Query(default=None),
    type_: str | None = Query(default=None, alias="type"),
    user: CurrentUser = Depends(get_current_user),
) -> list[dict]:
    await _owned_character(character_id, user.owner_scope)
    async with AsyncSessionLocal() as session:
        stmt = select(Memory).where(Memory.character_id == character_id)
        if tier:
            stmt = stmt.where(Memory.tier == tier)
        if status:
            stmt = stmt.where(Memory.status == status)
        if type_:
            stmt = stmt.where(Memory.type == type_)
        stmt = stmt.order_by(Memory.created_at.desc()).limit(200)
        rows = (await session.execute(stmt)).scalars().all()
    # 高敏不展示原文（sensitivity=high 摘要化）；墓碑不承载原文
    return [
        _memory_view(
            m,
            with_content=not (m.sensitivity == "high" or m.status == "tombstoned"),
        )
        for m in rows
    ]


@router.get("/memories/{memory_id}")
async def get_memory(memory_id: str, user: CurrentUser = Depends(get_current_user)) -> dict:
    async with AsyncSessionLocal() as session:
        memory = await session.get(Memory, memory_id)
        if memory is not None:
            character = await session.get(Character, memory.character_id)
    if memory is None or character is None or character.owner_scope != user.owner_scope:
        raise AppError("not_found", "记忆不存在。")
    return _memory_view(memory)


@router.post("/memories/{memory_id}/confirm")
async def confirm_memory_api(memory_id: str, user: CurrentUser = Depends(get_current_user)) -> dict:
    memory = await xirang.confirm_memory(memory_id, user.owner_scope)
    return _memory_view(memory)


@router.post("/memories/{memory_id}/deny")
async def deny_memory_api(memory_id: str, user: CurrentUser = Depends(get_current_user)) -> dict:
    return await xirang.deny_memory(memory_id, user.owner_scope)


@router.post("/memories/{memory_id}/correct")
async def correct_memory_api(
    memory_id: str, payload: CorrectRequest, user: CurrentUser = Depends(get_current_user)
) -> dict:
    memory = await xirang.correct_memory(memory_id, user.owner_scope, payload.new_content)
    return _memory_view(memory)


@router.delete("/memories/{memory_id}", status_code=204)
async def delete_memory_api(memory_id: str, user: CurrentUser = Depends(get_current_user)) -> None:
    await xirang.delete_memory(memory_id, user.owner_scope)


@router.post("/nodes/{node_id}/memorize", status_code=201)
async def memorize_node_api(
    node_id: str, payload: MemorizeRequest, user: CurrentUser = Depends(get_current_user)
) -> dict:
    memory = await xirang.memorize_node(
        node_id=node_id, owner_scope=user.owner_scope, label=payload.label
    )
    return _memory_view(memory)


@router.get("/characters/{character_id}/factual-records")
async def list_factual_records(
    character_id: str, user: CurrentUser = Depends(get_current_user)
) -> list[dict]:
    await _owned_character(character_id, user.owner_scope)
    async with AsyncSessionLocal() as session:
        rows = (
            await session.execute(
                select(FactualRecord)
                .where(FactualRecord.character_id == character_id)
                .order_by(FactualRecord.occurred_at.desc())
                .limit(100)
            )
        ).scalars().all()
    return [
        {
            "id": r.id,
            "canonization_id": r.canonization_id,
            "summary": r.summary,
            "evidence": json.loads(r.evidence_json or "{}"),
            "occurred_at": r.occurred_at.isoformat(),
        }
        for r in rows
    ]