"""E05 보고서 storage — 작업본 · 초기값 · 그림 · 옛 판(요구 347-5 · PLAN 534-3).

storage(E 프로젝트 루트):
    E05_StabReport/report.json        작업본(Workbook · 서버 재계산 `계산값` 포함)
    E05_StabReport/report_meta.json   해석 지문 · 만든 때 · 프로그램 몫 시트 서명(덮임 알림용)
    E05_StabReport/fig/<열쇠>.png      그림(열쇠 = `fig/<측점 키>.png` · `fig/3d_band.png`)
    E05_StabReport/_지난/<때>.json      갱신이 덮은 옛 판(덮인 시트에 사용자 고침이 있었을 때)
    initial_snapshot/E05_StabReport/  초기값 = 처음 만든 직후 한 벌(report · meta · fig)

시트 채우기 · 그림 SVG = `E05_StabReport_Build.py` · 데이터 3층 = CLAUDE.md 5장.
"""

from __future__ import annotations

import hashlib
import shutil
from datetime import datetime
from pathlib import Path
from typing import Any

from common_util.common_util_json import atomic_write_json
from common_util.common_util_spreadsheet import with_server_values
from common_util.common_util_svg_png import svgs_to_pngs
from E05_StabReport.E05_StabReport_Build import (
    META,
    PROGRAM_SHEETS,
    REPORT,
    _read,
    build_program,
    fig_path,
    fill_cover,
    form,
    gather,
    initial_dir,
    sheet_sign,
    stage_dir,
)


def revision(project_root: Path) -> str | None:
    path = stage_dir(project_root) / REPORT
    return hashlib.sha1(path.read_bytes()).hexdigest()[:16] if path.is_file() else None


def load(project_root: Path) -> tuple[dict[str, Any] | None, dict[str, Any] | None]:
    folder = stage_dir(project_root)
    return _read(folder / REPORT), _read(folder / META)


def _write_figures(folder: Path, jobs: list[tuple[str, str]]) -> list[str]:
    pngs = svgs_to_pngs([svg for _, svg in jobs])
    target = Path(folder) / "fig"
    if target.is_dir():
        shutil.rmtree(target)
    target.mkdir(parents=True)
    for (key, _), png in zip(jobs, pngs):
        fig_path(folder, key).write_bytes(png)
    return [key for key, _ in jobs]


def _write(project_root: Path, book: dict[str, Any], meta: dict[str, Any]) -> None:
    folder = stage_dir(project_root)
    atomic_write_json(folder / REPORT, book)
    atomic_write_json(folder / META, meta)


def _meta(book: dict[str, Any], inputs: dict[str, Any], figures: list[str]) -> dict[str, Any]:
    return {
        "fingerprint": inputs["fingerprint"],
        "built_at": datetime.now().isoformat(timespec="seconds"),
        "signs": {s["id"]: sheet_sign(s) for s in book["시트"] if s["id"] in PROGRAM_SHEETS},
        "figures": figures,
    }


def create(project_root: Path) -> dict[str, Any]:
    """처음 만듦 — 양식 전부 · 사용자 몫 처음 채움 · 초기값 한 벌. 돌려줌 = meta."""
    inputs = gather(project_root)
    book = form()
    fill_cover(next(s for s in book["시트"] if s["id"] == "s1"), inputs)
    jobs = build_program(book, inputs)
    book = with_server_values(book)
    folder = stage_dir(project_root)
    figures = _write_figures(folder, jobs)
    meta = _meta(book, inputs, figures)
    _write(project_root, book, meta)
    init = initial_dir(project_root)
    if init.is_dir():
        shutil.rmtree(init)
    init.mkdir(parents=True)
    for name in (REPORT, META):
        shutil.copy2(folder / name, init / name)
    shutil.copytree(folder / "fig", init / "fig")
    return meta


def refresh(project_root: Path) -> dict[str, Any]:
    """[보고서 갱신] — 프로그램 몫 시트 · 그림만 다시. 사용자 몫 · 사용자가 더한 시트는 그대로.
    덮인 시트에 사용자 고침이 있었으면 `overwritten`(시트 이름) · 옛 판 `_지난/`."""
    book, meta = load(project_root)
    if book is None:
        return {"created": True, "overwritten": [], **create(project_root)}
    inputs = gather(project_root)
    fresh = form()
    jobs = build_program(fresh, inputs)
    built = {s["id"]: s for s in fresh["시트"] if s["id"] in PROGRAM_SHEETS}
    signs = (meta or {}).get("signs") or {}
    overwritten = [
        s["이름"]
        for s in book["시트"]
        if s["id"] in built and signs.get(s["id"]) and sheet_sign(s) != signs[s["id"]]
    ]
    folder = stage_dir(project_root)
    if overwritten:
        old = folder / "_지난"
        old.mkdir(parents=True, exist_ok=True)
        stamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        shutil.copy2(folder / REPORT, old / f"{stamp}.json")
    have = {s["id"] for s in book["시트"]}
    sheets = [built.get(s["id"], s) for s in book["시트"]]
    sheets += [built[sid] for sid in PROGRAM_SHEETS if sid not in have]  # 지운 시트는 끝에 다시
    book = with_server_values({**book, "시트": sheets})
    figures = _write_figures(folder, jobs)
    new_meta = _meta(book, inputs, figures)
    _write(project_root, book, new_meta)
    return {"created": False, "overwritten": overwritten, **new_meta}


def reset(project_root: Path) -> bool:
    """[초기화] — 초기값을 작업본에 덮어씀(재계산 아님) · 초기값 없으면 False."""
    init = initial_dir(project_root)
    if not (init / REPORT).is_file():
        return False
    folder = stage_dir(project_root)
    folder.mkdir(parents=True, exist_ok=True)
    for name in (REPORT, META):
        shutil.copy2(init / name, folder / name)
    if (folder / "fig").is_dir():
        shutil.rmtree(folder / "fig")
    shutil.copytree(init / "fig", folder / "fig")
    return True


def save(project_root: Path, book: dict[str, Any]) -> None:
    """[저장] — 브라우저 `계산값` 은 버리고 서버 풀이로 · meta(지문 · 서명)는 그대로."""
    clean = with_server_values(book)
    atomic_write_json(stage_dir(project_root) / REPORT, clean)


def figures_of(project_root: Path, book: dict[str, Any]) -> dict[str, bytes]:
    """책이 가리키는 그림 열쇠 → PNG(있는 것만) — xlsx · PDF 내보내기용."""
    folder = stage_dir(project_root)
    out: dict[str, bytes] = {}
    for sheet in book.get("시트") or []:
        for fig in sheet.get("그림") or []:
            path = fig_path(folder, fig["열쇠"])
            if path.is_file():
                out[fig["열쇠"]] = path.read_bytes()
    return out