"""B09 내역 줄 ↔ 우리 공종 잇기 길(PLAN 707-4) — 저장 안 함(화면 캐시로 → [저장] 때 서버 정본).

    POST /api/projects/{id}/estimation/link/suggest   {user?}
        → {줄: 제안(`B09_Estimation_Bill_Link.suggest` · 구조물 묶음에 딸린 줄 뺌) ·
           저절로: 지난번 이음 · 하나 수 · 남은 · 자리 · 이은(`board`)}
    POST /api/projects/{id}/estimation/link/apply
        {pairs [{line, target, mode?}], auto, mode, counts?, user?} · 알림 남은 = 안 이은 항목 수
        잇기(`link`) → {user(새 캐시), 알림, payload(그 캐시로 셈)}
    POST …/link/undo {target, user?} → {user, 알림, payload} — 잇기 풀기
공사 내역 맞춤 기억(`실무자료/내역맞춤.json` · 지난번 이음 · 잊기)은 걷음(815-2 · 요구 765-2) —
제안은 짝 표만 · 옛 기억 파일은 읽지도 쓰지도 않음(지우지 않음).
끼워 넣기 = `B09_Estimation_Router`(같은 머리 · 같은 권한) · 화면 = `B09_Estimation_UI_Link`.
"""

from __future__ import annotations

import asyncio
from pathlib import Path
from typing import Any
from uuid import UUID

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field

from B08_Quantity.B08_Quantity_Router_Hydro import _project_root
from B09_Estimation import B09_Estimation_Bill_Link as linker
from B09_Estimation import B09_Estimation_Store as store
from common_util.common_util_auth import verify_session

router = APIRouter()
PATH = "/{project_id}/estimation/link"


def _draft(raw: Any) -> dict[str, Any] | None:
    return store.clean_user(raw) if isinstance(raw, dict) else None


class SuggestBody(BaseModel):
    user: dict[str, Any] | None = None


class Pair(BaseModel):
    line: str = Field(min_length=1, max_length=80)
    target: str = Field(min_length=1, max_length=200)
    mode: str | None = None


class UndoBody(BaseModel):
    target: str = Field(min_length=1, max_length=200)
    user: dict[str, Any] | None = None


class ApplyBody(BaseModel):
    pairs: list[Pair] = Field(default_factory=list, max_length=2000)
    auto: bool = False
    mode: str = "take"
    counts: dict[str, float] | None = None
    user: dict[str, Any] | None = None


async def _rows(project_id: UUID, root: Path, user: dict[str, Any]) -> list[dict[str, Any]]:
    from B09_Estimation.B09_Estimation_Router import payload  # 서로 부름 — 부를 때만

    return (await payload(project_id, root, user, True))["sheets"]["bill"]["rows"]


@router.post(PATH + "/suggest")
async def suggest(
    project_id: UUID, body: SuggestBody, session: dict[str, Any] = Depends(verify_session)
) -> dict[str, Any]:
    root = await _project_root(project_id)
    draft = _draft(body.user) or await asyncio.to_thread(store.read_user, root)
    rows = await _rows(project_id, root, draft)
    board = linker.board(draft, rows)
    left = {r["key"] for r in board["남은"]}
    lines = [s for s in linker.suggest(rows, {}) if s["key"] in left]
    return {"줄": lines, "저절로": len(linker.auto_pairs(lines)), **board}


@router.post(PATH + "/apply")
async def apply(
    project_id: UUID, body: ApplyBody, session: dict[str, Any] = Depends(verify_session)
) -> dict[str, Any]:
    from B09_Estimation.B09_Estimation_Router import payload  # 서로 부름 — 부를 때만

    modes = {p.line: p.mode for p in body.pairs if p.mode}
    if any(m not in linker.MODES for m in (body.mode, *modes.values())):
        raise HTTPException(status_code=400, detail="수량 갈래는 take · price 중 하나")
    root = await _project_root(project_id)
    draft = _draft(body.user) or await asyncio.to_thread(store.read_user, root)
    rows = await _rows(project_id, root, draft)
    pairs = [(p.line, p.target) for p in body.pairs]
    if body.auto:
        pairs += [p for p in linker.auto_pairs(linker.suggest(rows, {})) if p not in pairs]
    made, report = linker.link(draft, rows, pairs, body.mode, body.counts, modes)
    made = store.clean_user(made)
    report.pop("기억")
    out = await payload(project_id, root, made, True)
    left = linker.board(made, out["sheets"]["bill"]["rows"])["남은"]
    report["남은"] = sum(1 for r in left if r["kind"] == "item")
    return {"user": made, "알림": report, "payload": out}


@router.post(PATH + "/undo")
async def undo(
    project_id: UUID, body: UndoBody, session: dict[str, Any] = Depends(verify_session)
) -> dict[str, Any]:
    from B09_Estimation.B09_Estimation_Router import payload  # 서로 부름 — 부를 때만

    root = await _project_root(project_id)
    draft = _draft(body.user) or await asyncio.to_thread(store.read_user, root)
    made, why = linker.unlink(draft, await _rows(project_id, root, draft), body.target)
    if why:
        raise HTTPException(status_code=400, detail=why)
    made = store.clean_user(made)
    return {
        "user": made,
        "알림": {"풀음": 1},
        "payload": await payload(project_id, root, made, True),
    }