"""Z01 공종 편집 라우터 — 공종 머리·구성 줄을 관리자가 고치고 메움(2026-09-18 PLAN 1-0 계약).

  GET  /api/master-data/work-items?axis&status&q&page&size   목록 + 상태별 개수
  GET  /api/master-data/work-items/{key}                     머리(+revision)·구성 줄·원문 표·[주]
  PUT  /api/master-data/work-items/{key}                     전체 줄 보내기
                                                             → 409(낡은 revision) · 422(검사)
  POST /api/master-data/work-items/{key}/reset               머리·줄을 초기값으로(추가 줄 삭제)
쓰기는 한 트랜잭션(전부 아니면 전무) · 응답은 새 GET 모양 그대로(화면이 다시 안 불러도 됨).
⚠ 권한은 등록하는 쪽(`main.py`)이 시스템 관리자 전용 묶음으로 붙임.
"""

from __future__ import annotations

from decimal import Decimal
from typing import Any, Literal

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

from common_util.common_util_auth import verify_session
from config.config_db import get_db_pool
from Z01_MasterData import Z01_MasterData_Repository_WorkItems as repo
from Z01_MasterData import Z01_MasterData_Tables as tables
from Z01_MasterData import Z01_MasterData_WorkItems as work_items

router = APIRouter(prefix="/api/master-data", tags=["Z01 MasterData WorkItems"])

Status = Literal[work_items.STATUSES]  # 튜플을 펼침 — 상태 이름은 한 곳(`STATUSES`)
MAX_ROWS = 500


class _Strict(BaseModel):
    model_config = ConfigDict(extra="forbid")


class ItemHead(_Strict):
    name: str = Field(min_length=1)
    basis_quantity: Decimal | None = Field(default=None, ge=0)
    basis_unit: str | None = None
    status: Status


class ItemRow(_Strict):
    id: int | None = None  # 있으면 수정 · 없으면 추가
    variant: str = ""
    resource_kind: Literal["labor", "machine", "material", "etc"]
    resource_key: str | None = Field(default=None, min_length=1)  # 못 맞춘 줄은 null(빈 글자 금지)
    resource_name: str = ""
    resource_spec: str = ""
    amount: Decimal | None = Field(default=None, ge=0)
    amount_unit: str = ""
    alternative_amount: Decimal | None = Field(default=None, ge=0)
    group_ratio_pct: Decimal | None = Field(default=None, ge=0)
    raw_cell: str | None = None
    pum_table_id: str = ""


class WorkItemSave(_Strict):
    base_revision: int
    item: ItemHead
    rows: list[ItemRow] = Field(max_length=MAX_ROWS)  # 전체 줄 — 빠진 줄은 삭제


@router.get("/work-items")
async def list_work_items(
    axis: Literal["", "forest", "const"] = "",
    status: Status | Literal[""] = "",
    q: str = "",
    page: int = 1,
    size: int = tables.DEFAULT_PAGE_SIZE,
) -> dict[str, Any]:
    page, size = max(page, 1), max(1, min(size, tables.MAX_PAGE_SIZE))
    async with get_db_pool().acquire() as connection:
        found = await repo.list_items(
            connection, axis=axis, status=status, q=q.strip(), page=page, size=size
        )
    counts = {s: found["counts"].get(s, 0) for s in work_items.STATUSES}
    return {"status": "success", **found, "counts": counts, "page": page, "size": size}


async def _detail(connection: Any, key: str) -> dict[str, Any]:
    head = await repo.fetch_item(connection, key)
    if head is None:
        raise HTTPException(status_code=404, detail=f"없는 공종: {key}")
    rows = await repo.fetch_rows(connection, head["id"])
    revision = await repo.revision(connection, work_items.revision_scope(key))
    return {"status": "success", **work_items.detail(head, rows, revision)}


@router.get("/work-items/{key}")
async def get_work_item(key: str) -> dict[str, Any]:
    async with get_db_pool().acquire() as connection:
        return await _detail(connection, key)


async def _locked(connection: Any, key: str) -> tuple[dict[str, Any], int]:
    """공종 머리 + revision 을 잡음(같은 공종 저장이 줄 섬)."""
    head = await repo.fetch_item(connection, key, lock=True)
    if head is None:
        raise HTTPException(status_code=404, detail=f"없는 공종: {key}")
    return head, await repo.revision(connection, work_items.revision_scope(key), lock=True)


@router.put("/work-items/{key}")
async def put_work_item(
    key: str, body: WorkItemSave, session: dict = Depends(verify_session)
) -> dict[str, Any]:
    rows = [row.model_dump() for row in body.rows]
    async with get_db_pool().acquire() as connection:
        await connection.begin()
        try:
            head, current = await _locked(connection, key)
            if current != body.base_revision:
                raise HTTPException(
                    status_code=409,
                    detail="다른 곳에서 먼저 고쳤음 — 다시 불러올 것"
                    f"(지금 {current} · 보낸 {body.base_revision})",
                )
            existing = await repo.fetch_rows(connection, head["id"])
            known = await repo.known_resource_keys(
                connection, {row["resource_key"] for row in rows if row["resource_key"]}
            )
            errors = work_items.check_rows(rows, {row["id"] for row in existing}, known)
            if errors:
                raise HTTPException(status_code=422, detail="\n".join(errors))
            plan = work_items.plan_rows(existing, rows)
            await repo.write(
                connection, head["id"], body.item.model_dump(), plan, session.get("user_id")
            )
            await repo.bump_revision(connection, work_items.revision_scope(key))
            await connection.commit()
        except BaseException:
            await connection.rollback()
            raise
        return await _detail(connection, key)


@router.post("/work-items/{key}/reset")
async def reset_work_item(key: str, session: dict = Depends(verify_session)) -> dict[str, Any]:
    async with get_db_pool().acquire() as connection:
        await connection.begin()
        try:
            head, _current = await _locked(connection, key)
            rows = await repo.fetch_rows(connection, head["id"], with_deleted=True)
            plan = work_items.reset_plan(head, rows)
            await repo.write(connection, head["id"], plan["head"], plan, session.get("user_id"))
            await repo.bump_revision(connection, work_items.revision_scope(key))
            await connection.commit()
        except BaseException:
            await connection.rollback()
            raise
        return await _detail(connection, key)