"""쿠팡 밀크런 모듈 라우터.

- 경로: /cupang
- 권한: 로그인 + `cupang` 모듈 권한 (관리자는 항상 통과). 서버 측 검사.
- 데이터: CupangDBStore (cupang_db / PostgreSQL) 전용.
  CUPANG_DB_URL 미설정 시 store 가 None 이며, 각 페이지는 "설정 필요" 안내를 보여준다.
- 상품 검색: itemcode_db 읽기 전용(ItemcodeReader). 미설정 시 수동 입력 폴백.
"""

from __future__ import annotations

import calendar as _calendar
import json
from typing import Any

from app.timezone import today_kst

from fastapi import APIRouter, Body, Depends, Form, HTTPException, Request
from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse

from .holidays import is_holiday
from .store import SHIP_METHODS

router = APIRouter(prefix="/cupang", tags=["cupang"])


# ────────────────────────────────────────────────────────────
# 공용 헬퍼
# ────────────────────────────────────────────────────────────
def _store(request: Request) -> Any:
    """CupangDBStore 또는 None(CUPANG_DB_URL 미설정)."""
    return getattr(request.app.state, "cupang_store", None)


def _itemcode(request: Request) -> Any:
    return getattr(request.app.state, "itemcode_reader", None)


def _require_user(request: Request) -> dict[str, Any]:
    from app.main import get_current_user_record  # noqa: WPS433
    from app.store import has_module  # noqa: WPS433

    user = get_current_user_record(request)
    if user is None:
        raise HTTPException(status_code=401, detail="로그인이 필요합니다.")
    if not has_module(user, "cupang"):
        raise HTTPException(status_code=403, detail="쿠팡 밀크런 모듈 권한이 없습니다.")
    return user


def _render_config_needed(request: Request, user: dict[str, Any]) -> HTMLResponse:
    from app.main import build_erp_nav, render_template  # noqa: WPS433
    from app.store import is_admin  # noqa: WPS433

    return render_template(
        request,
        "denied.html",
        {
            "reason": "쿠팡 밀크런 모듈이 아직 설정되지 않았습니다. "
            "CUPANG_DB_URL 환경변수를 설정하고 scripts/sql/cupang_db_init.sql 로 "
            "cupang_db 를 초기화한 뒤 컨테이너를 재기동하세요.",
            "user": user,
            "is_admin": is_admin(user),
            "nav_items": build_erp_nav(user, active="cupang"),
        },
        status_code=503,
    )


def _guard(request: Request) -> tuple[Any, dict[str, Any]] | HTMLResponse | RedirectResponse:
    """로그인+권한+store 점검을 한 번에. 페이지 핸들러 진입부에서 사용."""
    from app.main import get_current_user_record, render_template  # noqa: WPS433
    from app.store import has_module, is_admin  # noqa: WPS433

    user = get_current_user_record(request)
    if user is None:
        return RedirectResponse(url="/login", status_code=303)
    if not has_module(user, "cupang"):
        return render_template(
            request,
            "denied.html",
            {"reason": "쿠팡 밀크런 모듈 접근 권한이 없습니다.", "is_admin": is_admin(user)},
            status_code=403,
        )
    store = _store(request)
    if store is None:
        return _render_config_needed(request, user)
    return store, user


def _parse_lines(lines_json: str) -> list[dict[str, Any]]:
    try:
        data = json.loads(lines_json or "[]")
    except (json.JSONDecodeError, TypeError):
        raise HTTPException(status_code=400, detail="라인 데이터 형식 오류")
    if not isinstance(data, list):
        raise HTTPException(status_code=400, detail="라인 데이터는 배열이어야 합니다.")
    return data


def _ym(request: Request) -> tuple[int, int]:
    today = today_kst()
    try:
        year = int(request.query_params.get("year") or today.year)
        month = int(request.query_params.get("month") or today.month)
    except ValueError:
        year, month = today.year, today.month
    if not (1 <= month <= 12):
        year, month = today.year, today.month
    return year, month


# ════════════════════════════════════════════════════════════
# 메인 — 월간 달력 + 선택일 출고 리스트
# ════════════════════════════════════════════════════════════
@router.get("/", response_class=HTMLResponse)
async def index(request: Request) -> HTMLResponse:
    from app.main import build_erp_nav, render_template  # noqa: WPS433
    from app.store import is_admin  # noqa: WPS433

    guard = _guard(request)
    if not isinstance(guard, tuple):
        return guard
    store, user = guard

    year, month = _ym(request)
    counts = store.calendar_counts(year=year, month=month)
    shipments = store.list_shipments(year=year, month=month)

    # 선택 날짜 (기본: 오늘이 이번 달이면 오늘, 아니면 1일)
    sel = request.query_params.get("date") or ""
    today = today_kst()
    if not sel:
        sel = today.isoformat() if (today.year == year and today.month == month) else f"{year:04d}-{month:02d}-01"

    # 선택일에 걸친 묶음(출고일 기준 우선, 작성/입고 포함)
    sel_shipments = [
        s for s in shipments
        if sel in (s.get("ship_date"), s.get("document_date"), s.get("center_arrival_date"))
    ]
    # 각 묶음에 품목 요약(제품명/수량) 첨부 — hover 툴팁용
    for s in sel_shipments:
        full = store.get_shipment(shipment_id=s["id"])
        s["tip_items"] = [
            {"name": ln.get("product_name_snapshot") or ln.get("product_code"),
             "qty": ln.get("quantity", 0)}
            for ln in (full.get("lines") if full else [])
        ]

    cal = _calendar.Calendar(firstweekday=6)  # 일요일 시작
    weeks = cal.monthdatescalendar(year, month)
    cal_weeks = [
        [
            {
                "date": d.isoformat(),
                "day": d.day,
                "in_month": d.month == month,
                "is_today": d == today,
                "is_selected": d.isoformat() == sel,
                "is_sunday": d.weekday() == 6,
                "is_saturday": d.weekday() == 5,
                "is_holiday": is_holiday(d),
                "counts": counts.get(d.isoformat(), {}),
            }
            for d in week
        ]
        for week in weeks
    ]

    prev_y, prev_m = (year - 1, 12) if month == 1 else (year, month - 1)
    next_y, next_m = (year + 1, 1) if month == 12 else (year, month + 1)

    return render_template(
        request,
        "cupang/index.html",
        {
            "user": user,
            "is_admin": is_admin(user),
            "nav_items": build_erp_nav(user, active="cupang"),
            "page_title": "쿠팡 밀크런",
            "page_subtitle": f"{year}년 {month}월 출고 일정",
            "year": year,
            "month": month,
            "prev_y": prev_y, "prev_m": prev_m,
            "next_y": next_y, "next_m": next_m,
            "weekdays": ["일", "월", "화", "수", "목", "금", "토"],
            "cal_weeks": cal_weeks,
            "selected_date": sel,
            "sel_shipments": sel_shipments,
        },
    )


# ════════════════════════════════════════════════════════════
# 출고 묶음 — 등록 / 수정 / 상세
# ════════════════════════════════════════════════════════════
def _form_context(request: Request, store: Any, user: dict[str, Any]) -> dict[str, Any]:
    from app.main import build_erp_nav  # noqa: WPS433
    from app.store import is_admin  # noqa: WPS433

    reader = _itemcode(request)
    return {
        "user": user,
        "is_admin": is_admin(user),
        "nav_items": build_erp_nav(user, active="cupang"),
        "centers": sorted(store.list_centers(), key=lambda c: c["name"]),
        "box_rules": store.list_box_rules(),
        "products": store.list_products(),
        "ship_methods": list(SHIP_METHODS),
        "search_enabled": bool(reader and reader.enabled),
    }


@router.get("/new", response_class=HTMLResponse)
async def new_form(request: Request) -> HTMLResponse:
    from app.main import render_template  # noqa: WPS433

    guard = _guard(request)
    if not isinstance(guard, tuple):
        return guard
    store, user = guard
    ctx = _form_context(request, store, user)
    ctx.update(
        {
            "page_title": "쿠팡 밀크런 — 신규 등록",
            "page_subtitle": "공통 헤더 1개 + 품목 라인",
            "mode": "new",
            "shipment": None,
            "default_date": today_kst().isoformat(),
        }
    )
    return render_template(request, "cupang/form.html", ctx)


@router.post("/new")
async def create(
    request: Request,
    lines_json: str = Form("[]"),
    document_date: str = Form(...),
    ship_date: str = Form(...),
    center_arrival_date: str = Form(...),
    center_id: str = Form(""),
    center_name_snapshot: str = Form(""),
    ship_method: str = Form("택배"),
    outbound_summary: str = Form(""),
    worker: str = Form(""),
    memo: str = Form(""),
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    header = {
        "document_date": document_date,
        "ship_date": ship_date,
        "center_arrival_date": center_arrival_date,
        "center_id": center_id,
        "center_name_snapshot": center_name_snapshot,
        "ship_method": ship_method,
        "outbound_summary": outbound_summary,
        "worker": worker,
        "memo": memo,
    }
    try:
        ship = store.create_shipment(
            created_by=user["email"], header=header, lines=_parse_lines(lines_json)
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return RedirectResponse(url=f"/cupang/{ship['id']}", status_code=303)


@router.get("/{shipment_id:int}", response_class=HTMLResponse)
async def detail(request: Request, shipment_id: int) -> HTMLResponse:
    from app.main import build_erp_nav, render_template  # noqa: WPS433
    from app.store import is_admin  # noqa: WPS433

    guard = _guard(request)
    if not isinstance(guard, tuple):
        return guard
    store, user = guard
    ship = store.get_shipment(shipment_id=shipment_id)
    if not ship:
        return render_template(
            request, "denied.html",
            {"reason": "출고 묶음을 찾을 수 없습니다.", "is_admin": is_admin(user)},
            status_code=404,
        )
    return render_template(
        request,
        "cupang/detail.html",
        {
            "user": user,
            "is_admin": is_admin(user),
            "nav_items": build_erp_nav(user, active="cupang"),
            "page_title": f"출고 #{ship['id']}",
            "page_subtitle": f"{ship['ship_date']} · {ship['center_name_snapshot']}",
            "shipment": ship,
        },
    )


@router.get("/{shipment_id:int}/edit", response_class=HTMLResponse)
async def edit_form(request: Request, shipment_id: int) -> HTMLResponse:
    from app.main import render_template  # noqa: WPS433
    from app.store import is_admin  # noqa: WPS433

    guard = _guard(request)
    if not isinstance(guard, tuple):
        return guard
    store, user = guard
    ship = store.get_shipment(shipment_id=shipment_id)
    if not ship:
        return render_template(
            request, "denied.html",
            {"reason": "출고 묶음을 찾을 수 없습니다.", "is_admin": is_admin(user)},
            status_code=404,
        )
    ctx = _form_context(request, store, user)
    ctx.update(
        {
            "page_title": f"출고 #{ship['id']} 수정",
            "page_subtitle": "헤더/라인 수정 후 저장",
            "mode": "edit",
            "shipment": ship,
            "default_date": ship["document_date"],
        }
    )
    return render_template(request, "cupang/form.html", ctx)


@router.post("/{shipment_id:int}/edit")
async def update(
    request: Request,
    shipment_id: int,
    lines_json: str = Form("[]"),
    document_date: str = Form(...),
    ship_date: str = Form(...),
    center_arrival_date: str = Form(...),
    center_id: str = Form(""),
    center_name_snapshot: str = Form(""),
    ship_method: str = Form("택배"),
    outbound_summary: str = Form(""),
    worker: str = Form(""),
    memo: str = Form(""),
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    header = {
        "document_date": document_date,
        "ship_date": ship_date,
        "center_arrival_date": center_arrival_date,
        "center_id": center_id,
        "center_name_snapshot": center_name_snapshot,
        "ship_method": ship_method,
        "outbound_summary": outbound_summary,
        "worker": worker,
        "memo": memo,
    }
    try:
        store.update_shipment(
            shipment_id=shipment_id, header=header, lines=_parse_lines(lines_json)
        )
    except KeyError:
        raise HTTPException(status_code=404, detail="출고 묶음을 찾을 수 없습니다.")
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return RedirectResponse(url=f"/cupang/{shipment_id}", status_code=303)


@router.post("/{shipment_id:int}/delete")
async def delete(
    request: Request,
    shipment_id: int,
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    """운영 안전: 기본은 status='취소' soft delete."""
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.soft_delete(shipment_id=shipment_id)
    except KeyError:
        raise HTTPException(status_code=404, detail="출고 묶음을 찾을 수 없습니다.")
    return RedirectResponse(url=f"/cupang/{shipment_id}", status_code=303)


@router.post("/{shipment_id:int}/hard-delete")
async def hard_delete(
    request: Request,
    shipment_id: int,
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    """완전 삭제(헤더+라인 CASCADE). 달력으로 복귀."""
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.hard_delete(shipment_id=shipment_id)
    except KeyError:
        raise HTTPException(status_code=404, detail="출고 묶음을 찾을 수 없습니다.")
    return RedirectResponse(url="/cupang/", status_code=303)


# ════════════════════════════════════════════════════════════
# 입고센터 관리
# ════════════════════════════════════════════════════════════
@router.get("/centers", response_class=HTMLResponse)
async def centers_page(request: Request) -> HTMLResponse:
    from app.main import build_erp_nav, render_template  # noqa: WPS433
    from app.store import is_admin  # noqa: WPS433

    guard = _guard(request)
    if not isinstance(guard, tuple):
        return guard
    store, user = guard
    centers = sorted(store.list_centers(include_inactive=True), key=lambda c: c["name"])
    # 사용 중 여부 표시
    for c in centers:
        c["in_use"] = store.center_in_use(center_id=c["id"])
    return render_template(
        request,
        "cupang/centers.html",
        {
            "user": user,
            "is_admin": is_admin(user),
            "nav_items": build_erp_nav(user, active="cupang"),
            "page_title": "쿠팡 밀크런 — 입고센터 관리",
            "page_subtitle": "추가 · 수정 · 비활성화. 사용 중 센터는 삭제되지 않고 비활성화됩니다.",
            "centers": centers,
        },
    )


@router.post("/centers")
async def center_create(
    request: Request,
    name: str = Form(...),
    sort_order: int = Form(0),
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.create_center(name=name, sort_order=sort_order)
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return RedirectResponse(url="/cupang/centers", status_code=303)


@router.post("/centers/{center_id}/edit")
async def center_edit(
    request: Request,
    center_id: int,
    name: str = Form(""),
    active: str = Form(""),
    sort_order: str = Form(""),
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    kwargs: dict[str, Any] = {"center_id": center_id}
    if name.strip():
        kwargs["name"] = name
    if active != "":
        kwargs["active"] = active in ("1", "true", "on", "True")
    if sort_order.strip():
        try:
            kwargs["sort_order"] = int(sort_order)
        except ValueError:
            pass
    try:
        store.update_center(**kwargs)
    except KeyError:
        raise HTTPException(status_code=404, detail="센터를 찾을 수 없습니다.")
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return RedirectResponse(url="/cupang/centers", status_code=303)


@router.post("/centers/{center_id}/delete")
async def center_delete(
    request: Request,
    center_id: int,
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.delete_center(center_id=center_id)
    except KeyError:
        raise HTTPException(status_code=404, detail="센터를 찾을 수 없습니다.")
    return RedirectResponse(url="/cupang/centers", status_code=303)


# ════════════════════════════════════════════════════════════
# 박스 입수량 관리
# ════════════════════════════════════════════════════════════
@router.get("/box-rules", response_class=HTMLResponse)
async def box_rules_page(request: Request) -> HTMLResponse:
    from app.main import build_erp_nav, render_template  # noqa: WPS433
    from app.store import is_admin  # noqa: WPS433

    guard = _guard(request)
    if not isinstance(guard, tuple):
        return guard
    store, user = guard
    return render_template(
        request,
        "cupang/box_rules.html",
        {
            "user": user,
            "is_admin": is_admin(user),
            "nav_items": build_erp_nav(user, active="cupang"),
            "page_title": "쿠팡 밀크런 — 박스 입수량",
            "page_subtitle": "제품코드별 쿠팡박스 1박스당 입수량 설정",
            "box_rules": store.list_box_rules(include_inactive=True),
            "products": store.list_products(),
            "search_enabled": bool((_itemcode(request)) and _itemcode(request).enabled),
        },
    )


@router.post("/box-rules")
async def box_rule_upsert(
    request: Request,
    product_code: str = Form(...),
    units_per_box: int = Form(...),
    product_name_snapshot: str = Form(""),
    box_name: str = Form("쿠팡박스"),
    memo: str = Form(""),
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.upsert_box_rule(
            product_code=product_code,
            units_per_box=units_per_box,
            product_name_snapshot=product_name_snapshot,
            box_name=box_name,
            memo=memo,
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return RedirectResponse(url="/cupang/box-rules", status_code=303)


@router.post("/box-rules/{rule_id}/delete")
async def box_rule_delete(
    request: Request,
    rule_id: int,
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.delete_box_rule(rule_id=rule_id)
    except KeyError:
        raise HTTPException(status_code=404, detail="규칙을 찾을 수 없습니다.")
    return RedirectResponse(url="/cupang/box-rules", status_code=303)


# ════════════════════════════════════════════════════════════
# 설정 — 제품명 카탈로그 관리 (itemcode_db 에서 등록)
# ════════════════════════════════════════════════════════════
@router.get("/products", response_class=HTMLResponse)
async def products_page(request: Request) -> HTMLResponse:
    from app.main import build_erp_nav, render_template  # noqa: WPS433
    from app.store import is_admin  # noqa: WPS433

    guard = _guard(request)
    if not isinstance(guard, tuple):
        return guard
    store, user = guard
    reader = _itemcode(request)
    return render_template(
        request,
        "cupang/products.html",
        {
            "user": user,
            "is_admin": is_admin(user),
            "nav_items": build_erp_nav(user, active="cupang"),
            "page_title": "쿠팡 밀크런 — 설정 (제품명)",
            "page_subtitle": "왼쪽 itemcode_db 목록에서 선택해 등록하면 폼 드롭다운에 노출됩니다.",
            "products": store.list_products(include_inactive=True),
            "registered_codes": [p["product_code"] for p in store.list_products(include_inactive=True)],
            "search_enabled": bool(reader and reader.enabled),
            "search_reason": (reader.reason if reader else ""),
        },
    )


@router.get("/api/products/all")
async def product_all(
    request: Request, _: dict[str, Any] = Depends(_require_user)
) -> JSONResponse:
    """itemcode_db 전체 상품 목록(낱개+세트). 설정 화면 왼쪽 리스트 소스."""
    reader = _itemcode(request)
    results = reader.list_all() if reader else []
    return JSONResponse(
        {
            "enabled": bool(reader and reader.enabled),
            "reason": (reader.reason if reader else "itemcode 리더 미초기화"),
            "error": (getattr(reader, "last_error", "") if reader else ""),
            "count": len(results),
            "results": results,
        }
    )


@router.post("/products/bulk")
async def product_bulk(
    request: Request,
    items: list[dict[str, Any]] = Body(..., embed=True),
    user: dict[str, Any] = Depends(_require_user),
) -> JSONResponse:
    """선택한 상품들을 일괄 등록(upsert). body: {"items":[{"code","name"}, ...]}."""
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    added = 0
    for it in items:
        code = str(it.get("code") or "").strip()
        name = str(it.get("name") or "").strip()
        if not code or not name:
            continue
        try:
            store.upsert_product(product_code=code, product_name=name)
            added += 1
        except ValueError:
            continue
    return JSONResponse({"ok": True, "added": added})


@router.post("/products")
async def product_upsert(
    request: Request,
    product_code: str = Form(...),
    product_name: str = Form(...),
    sort_order: int = Form(0),
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.upsert_product(
            product_code=product_code, product_name=product_name, sort_order=sort_order
        )
    except ValueError as exc:
        raise HTTPException(status_code=400, detail=str(exc))
    return RedirectResponse(url="/cupang/products", status_code=303)


@router.post("/products/{product_id:int}/active")
async def product_set_active(
    request: Request,
    product_id: int,
    active: str = Form(...),
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.set_product_active(
            product_id=product_id, active=active in ("1", "true", "on", "True")
        )
    except KeyError:
        raise HTTPException(status_code=404, detail="제품을 찾을 수 없습니다.")
    return RedirectResponse(url="/cupang/products", status_code=303)


@router.post("/products/{product_id:int}/delete")
async def product_delete(
    request: Request,
    product_id: int,
    user: dict[str, Any] = Depends(_require_user),
) -> RedirectResponse:
    """완전 삭제(hard delete)."""
    store = _store(request)
    if store is None:
        raise HTTPException(status_code=503, detail="cupang_db 미설정")
    try:
        store.delete_product(product_id=product_id)
    except KeyError:
        raise HTTPException(status_code=404, detail="제품을 찾을 수 없습니다.")
    return RedirectResponse(url="/cupang/products", status_code=303)


@router.get("/health")
async def health() -> dict[str, str]:
    return {"status": "ok", "module": "cupang"}