"""M02 층 집계표 API — `/api/m02/layers/{layer}/…` · 항목 목록 · 항목 복사(PLAN 21-1 · 21-2).

⚠ 등록은 `main.py`(로그인만) · 층 권한은 여기서(`Router_Layers._layer_dir` 와 같은 규칙):
    system    읽기 = 로그인 누구나(항목 고르기) · 쓰기 = SYSTEM_ADMIN
    company   읽기 = 같은 회사 · 쓰기 = 회사 관리자(ADMIN · 마스터 · SYSTEM_ADMIN)
    personal  읽기 · 쓰기 = 본인(SYSTEM_ADMIN 은 누구나) · 회사 없음 = 쓰기 409 「회사부터 등록」
옛 길(`/api/m02/structures/…` 등 · `M02_MasterTemplete_Router.py`)은 시스템 층 별칭으로 그대로.
회사 · 개인 층은 처음 부를 때 빈 뼈대를 만듦(`Items.ensure`).
"""

from __future__ import annotations

from pathlib import Path
from typing import Any, Literal

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

from common_util.common_util_auth import verify_session
from M02_MasterTemplete import M02_MasterTemplete_Branch as branch
from M02_MasterTemplete import M02_MasterTemplete_Items as items_store
from M02_MasterTemplete import M02_MasterTemplete_Matset as matset
from M02_MasterTemplete import M02_MasterTemplete_Store as store
from M02_MasterTemplete import M02_Template_Layers as layers
from M02_MasterTemplete.M02_MasterTemplete_Router import (
    BranchBody,
    MaterialBranchBody,
    MatsetBody,
    UseComboBody,
)

router = APIRouter(prefix="/api/m02", tags=["M02 MasterTemplete Items"])

Layer = Literal["system", "company", "personal"]
Session = dict[str, Any]
NO_COMPANY = "회사부터 등록 — 회사 없이는 회사 · 개인 구조물 집계표를 만들 수 없음"


class CopyItemBody(BaseModel):
    from_layer: Literal["system", "company"]
    from_owner: str | None = None
    key: str


def _admin(session: Session) -> bool:
    return session.get("role") == "SYSTEM_ADMIN"


def _company_admin(session: Session) -> bool:
    return session.get("role") in ("ADMIN", "SYSTEM_ADMIN") or bool(session.get("is_master"))


def _owner(session: Session, layer: str, owner: str | None) -> str | None:
    """층 주인 글 — 회사 `{회사}` · 개인 `{회사}/{사용자}` · 시스템 None ·
    남의 것은 SYSTEM_ADMIN 만."""
    if layer == "system":
        return None
    company, user = session.get("company_id"), session.get("user_id")
    mine = str(company) if layer == "company" else f"{company}/{user}"
    if owner in (None, "", mine):
        return None if company is None else mine
    if not _admin(session):
        raise HTTPException(status_code=403, detail="다른 회사 · 다른 사람의 구조물 집계표입니다.")
    return owner


def _folder(layer: str, owner: str | None) -> Path:
    if layer == "system":
        return store.FOLDER
    try:
        if layer == "company":
            return layers.company_dir(owner)
        company, user = str(owner).split("/", 1)
        return layers.personal_dir(company, user)
    except ValueError as error:
        raise HTTPException(status_code=400, detail=f"층 주인 모양 — {error}") from error


def _root(session: Session, layer: str, owner: str | None = None, write: bool = False) -> Path:
    """층 폴더(권한까지) — 회사 · 개인은 없으면 빈 뼈대를 만듦. 회사 없는 사람: 쓰기 409."""
    if layer == "system":
        if write and not _admin(session):
            raise HTTPException(status_code=403, detail="마스터 템플릿은 시스템 관리자만 고침.")
        return store.FOLDER
    who = _owner(session, layer, owner)
    if who is None:
        raise HTTPException(status_code=409, detail=NO_COMPANY)
    if write and layer == "company" and not _company_admin(session):
        raise HTTPException(
            status_code=403, detail="회사용은 회사 관리자만 고침 — 개인용으로 복사해서 씀."
        )
    folder = _folder(layer, who)
    items_store.ensure(folder)
    return folder


def _call(folder: Path, fn, *args):
    with store.at(folder):
        try:
            return fn(*args)
        except store.StoreError as e:
            raise HTTPException(status_code=e.status, detail=e.detail) from e


# ── 항목 목록 · 복사 ───────────────────────────────────


def _listing(session: Session, layer: str, owner: str | None) -> dict[str, Any]:
    who = None if layer == "system" else _owner(session, layer, owner)
    if layer != "system" and who is None:
        return {"layer": layer, "owner": None, "items": []}  # 회사 없음 = 빈 그룹
    folder = _root(session, layer, who)
    return {"layer": layer, "owner": who, "items": items_store.items(folder)}


@router.get("/items")
def get_items(
    layer: Layer = "system",
    owner: str | None = None,
    all: bool = False,  # noqa: A002 — 21-1 약속 이름 `?all=1`
    session: Session = Depends(verify_session),
):
    """21-1 — 한 층이면 `[{key, 열, 종류, 분류1~3, 단위, 일위대가, 자재조합, 도번, 면적번,
    재료번}]` ·
    `?all=1` 이면 세 층 `[{layer, owner, items}]`(회사 · 개인은 세션 것 · 회사 없으면 빈 목록)."""
    if all:
        return [_listing(session, one, None) for one in ("system", "company", "personal")]
    return _listing(session, layer, owner)["items"]


@router.post("/layers/personal/items/copy")
def copy_item(body: CopyItemBody, session: Session = Depends(verify_session)) -> dict:
    """회사 · 마스터 항목 → 내 개인 층 새 항목(열 · 세 파일 · 자재 조합 줄 · 새 SS 키 · `본뜬`)."""
    target = _root(session, "personal", None, write=True)
    source = _root(session, body.from_layer, body.from_owner)
    owner = (
        None if body.from_layer == "system" else _owner(session, body.from_layer, body.from_owner)
    )
    origin = {"layer": body.from_layer, "owner": owner, "key": body.key}
    try:
        return items_store.copy_item(source, target, body.key, origin)
    except store.StoreError as e:
        raise HTTPException(status_code=e.status, detail=e.detail) from e


# ── 층 길 — 옛 시스템 길과 같은 모양 ─────────────────────


@router.get("/layers/{layer}/structures/numbers")
def get_numbers(layer: Layer, owner: str | None = None, session: Session = Depends(verify_session)):
    return _call(_root(session, layer, owner), store.structure_numbers)


@router.get("/layers/{layer}/structure-combos")
def get_combos(layer: Layer, owner: str | None = None, session: Session = Depends(verify_session)):
    return _call(_root(session, layer, owner), store.read_combos)


@router.post("/layers/{layer}/structures/{column}")
def post_structure(
    layer: Layer, column: str, owner: str | None = None, session: Session = Depends(verify_session)
):
    return _call(_root(session, layer, owner, write=True), store.create_structure, column)


@router.post("/layers/{layer}/structures/{column}/combo")
def post_combo(
    layer: Layer,
    column: str,
    body: BranchBody,
    owner: str | None = None,
    session: Session = Depends(verify_session),
):
    """일위대가 조합 갈라 내기 — 새 UA 는 M01 시스템 마스터에 생기므로 SYSTEM_ADMIN 만."""
    folder = _root(session, layer, owner, write=True)
    if not _admin(session):
        raise HTTPException(status_code=403, detail="일위대가 조합은 시스템 관리자만 새로 만듦.")
    return _call(
        folder, branch.branch_combo, column, body.본뜬키, body.담은로직, body.이름, body.판
    )


@router.post("/layers/{layer}/structures/{column}/material-combo")
def post_material_combo_branch(
    layer: Layer,
    column: str,
    body: MaterialBranchBody,
    owner: str | None = None,
    session: Session = Depends(verify_session),
):
    folder = _root(session, layer, owner, write=True)
    args = (column, body.본뜬키, body.담은자재, body.이름, body.판)
    return _call(folder, branch.branch_material_combo, *args)


@router.post("/layers/{layer}/structures/{column}/use-combo")
def post_use_combo(
    layer: Layer,
    column: str,
    body: UseComboBody,
    owner: str | None = None,
    session: Session = Depends(verify_session),
):
    folder = _root(session, layer, owner, write=True)
    return _call(folder, branch.use_combo, column, body.종류, body.키, body.판)


@router.post("/layers/{layer}/{kind}/{column}/copy")
def post_copy(
    layer: Layer,
    kind: Literal["structures", "area", "material"],
    column: str,
    source: str = Query(alias="from"),
    owner: str | None = None,
    session: Session = Depends(verify_session),
):
    folder = _root(session, layer, owner, write=True)
    part = "structure" if kind == "structures" else kind
    return _call(folder, store.copy_from, part, column, source)


@router.get("/layers/{layer}/material-combos")
def get_matsets(layer: Layer, owner: str | None = None, session: Session = Depends(verify_session)):
    return _call(_root(session, layer, owner), matset.listing)


@router.get("/layers/{layer}/material-combos/{key}")
def get_matset(
    layer: Layer, key: str, owner: str | None = None, session: Session = Depends(verify_session)
):
    return _call(_root(session, layer, owner), matset.one, key)


@router.post("/layers/{layer}/material-combos")
def post_matset(
    layer: Layer,
    body: MatsetBody,
    owner: str | None = None,
    session: Session = Depends(verify_session),
):
    return _call(_root(session, layer, owner, write=True), matset.create, body.줄, body.판)


@router.put("/layers/{layer}/material-combos/{key}")
def put_matset(
    layer: Layer,
    key: str,
    body: MatsetBody,
    owner: str | None = None,
    session: Session = Depends(verify_session),
):
    return _call(_root(session, layer, owner, write=True), matset.edit, key, body.줄, body.판)


@router.delete("/layers/{layer}/material-combos/{key}")
def delete_matset(
    layer: Layer,
    key: str,
    판: str = "",
    owner: str | None = None,
    session: Session = Depends(verify_session),
):
    return _call(_root(session, layer, owner, write=True), matset.delete, key, 판)