"""내장 엑셀 통합문서(Workbook JSON) → xlsx 바이트(요구 347-5 · PLAN 534-2).

계약 = `A00_Common/spreadsheet/spreadsheet_types.ts` — 서식 이름이 엑셀 이름 그대로라 1:1 로 옮김.
    값 · 식(`=` 붙여 살아 있는 수식 · 열 때 엑셀이 다시 셈) ·
    서식(글꼴 · 채움 · 맞춤 · 줄바꿈 · 테두리 · 숫자 형식) ·
    병합 · 열 폭(글자 단위) · 행 높이(pt) · 숨김 · 틀 고정 · 눈금선 · 시트 숨김 · 탭 색 ·
    인쇄(용지 · 방향 · 배율/맞춤 · 여백 · 머리 줄 반복 · 쪽 나눔) · 그림(범위 두 칸 닻).
서식 차례는 화면과 같음(칸 → 행 → 열 → 시트 기본 → 0 · `spreadsheet_cellstyle.styleIndexAt`) ·
안 준 맞춤 = 가운데 · 가운데(237-1, 화면 · 붙여넣기 · 인쇄 공통).
그림 = `figures` {열쇠: PNG 바이트} · 없는 열쇠는 건너뜀.
값 셈 없음(서버 재계산은 부른 쪽 `with_server_values`).
"""

from __future__ import annotations

import io
import re
from typing import Any

from openpyxl import Workbook as XlBook
from openpyxl.drawing.image import Image
from openpyxl.drawing.spreadsheet_drawing import AnchorMarker, TwoCellAnchor
from openpyxl.styles import Alignment, Border, Font, PatternFill, Side
from openpyxl.utils import column_index_from_string, get_column_letter
from openpyxl.worksheet.page import PageMargins
from openpyxl.worksheet.pagebreak import Break

from common_util.common_util_print_pdf import sheet_title

A1 = re.compile(r"^([A-Z]+)(\d+)$")
PAPER = {"A4": 9, "A3": 8}
MM_PER_INCH = 25.4


def _rc(a1: str) -> tuple[int, int]:
    """A1 → (행, 열) 1 부터."""
    m = A1.match(a1.upper())
    if not m:
        raise ValueError(f"칸 주소 꼴 아님 「{a1}」")
    return int(m.group(2)), column_index_from_string(m.group(1))


def _span(text: str) -> tuple[int, int, int, int]:
    """`B5:H20` · `B5` → (r0, c0, r1, c1) 1 부터."""
    a, _, b = text.partition(":")
    r0, c0 = _rc(a)
    r1, c1 = _rc(b) if b else (r0, c0)
    return min(r0, r1), min(c0, c1), max(r0, r1), max(c0, c1)


def _color(hex_: str | None) -> str | None:
    return hex_.lstrip("#").upper() if hex_ else None


def _style(st: dict[str, Any]) -> dict[str, Any]:
    """서식 한 벌 → openpyxl 속성(font · fill · alignment · border · number_format)."""
    h = st.get("가로")
    side = {
        k: Side(style=v["선"], color=_color(v.get("색")) or "000000")
        for k, v in (st.get("테두리") or {}).items()
    }
    out: dict[str, Any] = {
        "font": Font(
            name=st.get("글꼴"),
            size=st.get("크기"),
            bold=st.get("굵게"),
            italic=st.get("기울임"),
            underline="single" if st.get("밑줄") else None,
            strike=st.get("취소선"),
            color=_color(st.get("글자색")),
        ),
        "alignment": Alignment(
            horizontal="center" if not h or h == "general" else h,
            vertical=st.get("세로") or "center",
            wrap_text=st.get("줄바꿈"),
        ),
        "border": Border(
            top=side.get("위"), bottom=side.get("아래"), left=side.get("왼"), right=side.get("오른")
        ),
    }
    if st.get("채움"):
        out["fill"] = PatternFill("solid", fgColor=_color(st["채움"]))
    if st.get("형식"):
        out["number_format"] = st["형식"]
    return out


def _extent(sheet: dict[str, Any]) -> tuple[int, int]:
    """쓰는 마지막 행 · 열(1 부터) — 칸 · 병합 · 그림 닻."""
    spans = [_span(a1) for a1 in sheet.get("칸", {})]
    spans += [_span(m) for m in sheet.get("병합") or []]
    spans += [_span(f["닻"]) for f in sheet.get("그림") or []]
    return max((s[2] for s in spans), default=0), max((s[3] for s in spans), default=0)


def _print(ws: Any, pr: dict[str, Any]) -> None:
    ws.page_setup.paperSize = PAPER.get(pr.get("용지") or "A4", 9)
    ws.page_setup.orientation = pr.get("방향") or "portrait"
    fit = pr.get("맞춤")
    if fit:
        ws.sheet_properties.pageSetUpPr.fitToPage = True
        ws.page_setup.fitToWidth = fit.get("폭", 0)
        ws.page_setup.fitToHeight = fit.get("높이", 0)
    elif pr.get("배율"):
        ws.page_setup.scale = pr["배율"]
    m = {"위": 10, "아래": 10, "왼": 10, "오른": 10, **(pr.get("여백") or {})}
    ws.page_margins = PageMargins(
        top=m["위"] / MM_PER_INCH,
        bottom=m["아래"] / MM_PER_INCH,
        left=m["왼"] / MM_PER_INCH,
        right=m["오른"] / MM_PER_INCH,
    )
    if pr.get("머리행"):
        a, b = pr["머리행"]
        ws.print_title_rows = f"{a}:{b}"
    for k in sorted(set(pr.get("쪽나눔") or [])):
        ws.row_breaks.append(Break(id=k))


def _sheet(ws: Any, book: dict[str, Any], sheet: dict[str, Any], styles: list, figures) -> None:
    cells = sheet.get("칸", {})
    rows_info = sheet.get("행") or {}
    cols_info = sheet.get("열") or {}
    base = sheet.get("기본") or {}
    n_rows, n_cols = _extent(sheet)
    for r in range(1, n_rows + 1):
        for c in range(1, n_cols + 1):
            letter = get_column_letter(c)
            cell = cells.get(f"{letter}{r}")
            idx = next(
                (
                    i
                    for i in (
                        (cell or {}).get("서식"),
                        rows_info.get(str(r), {}).get("서식"),
                        cols_info.get(letter, {}).get("서식"),
                        base.get("서식"),
                    )
                    if i is not None
                ),
                0,
            )
            if cell is None and not idx:
                continue
            xl = ws.cell(row=r, column=c)
            if cell and cell.get("식") is not None:
                xl.value = "=" + cell["식"]
            elif cell and "값" in cell:
                xl.value = cell["값"]
                if isinstance(cell["값"], str) and cell["값"].startswith("="):
                    xl.data_type = "s"  # 글로 친 「=…」 — 수식 아님
            for attr, value in (styles[idx] if 0 <= idx < len(styles) else {}).items():
                setattr(xl, attr, value)
    for m in sheet.get("병합") or []:
        ws.merge_cells(m)
    width = base.get("열폭") or (book.get("기본") or {}).get("열폭")
    if width:
        ws.sheet_format.defaultColWidth = width
    height = base.get("행높이") or (book.get("기본") or {}).get("행높이")
    if height:
        ws.sheet_format.defaultRowHeight = height
        ws.sheet_format.customHeight = True
    for letter, info in cols_info.items():
        dim = ws.column_dimensions[letter]
        if info.get("폭") is not None:
            dim.width = info["폭"]
        dim.hidden = bool(info.get("숨김"))
    for key, info in rows_info.items():
        dim = ws.row_dimensions[int(key)]
        if info.get("높이") is not None:
            dim.height = info["높이"]
        dim.hidden = bool(info.get("숨김") or info.get("걸러짐"))
    frozen = sheet.get("틀고정") or {}
    if frozen.get("행") or frozen.get("열"):
        ws.freeze_panes = ws.cell(
            row=(frozen.get("행") or 0) + 1, column=(frozen.get("열") or 0) + 1
        )
    if (sheet.get("보기") or {}).get("눈금선") is False:
        ws.sheet_view.showGridLines = False
    if sheet.get("숨김"):
        ws.sheet_state = "hidden"
    if sheet.get("탭색"):
        ws.sheet_properties.tabColor = _color(sheet["탭색"])
    _print(ws, sheet.get("인쇄") or {})
    for fig in sheet.get("그림") or []:
        png = figures.get(fig["열쇠"])
        if not png:
            continue
        r0, c0, r1, c1 = _span(fig["닻"])
        img = Image(io.BytesIO(png))
        img.anchor = TwoCellAnchor(
            editAs="twoCell",
            _from=AnchorMarker(col=c0 - 1, row=r0 - 1),
            to=AnchorMarker(col=c1, row=r1),
        )
        ws.add_image(img)


def workbook_to_xlsx(book: dict[str, Any], figures: dict[str, bytes] | None = None) -> bytes:
    """통합문서 → xlsx 바이트 — 시트 차례 그대로 · 열 때 활성 시트 = `활성`."""
    xl = XlBook()
    xl.remove(xl.active)
    styles = [_style(st or {}) for st in book.get("서식") or [{}]]
    used: set[str] = set()
    active = 0
    for i, sheet in enumerate(book.get("시트") or []):
        ws = xl.create_sheet(sheet_title(sheet.get("이름") or "시트", used))
        _sheet(ws, book, sheet, styles, figures or {})
        if sheet.get("id") == book.get("활성"):
            active = i
    if not xl.worksheets:
        xl.create_sheet("시트")
    xl.active = active
    xl.calculation.fullCalcOnLoad = True  # 식 값은 엑셀이 열 때 셈(캐시 값 없음)
    out = io.BytesIO()
    xl.save(out)
    return out.getvalue()