Aislo/A00_Common/spreadsheet/spreadsheet_numfmt.ts

/* =============================================================================
 * spreadsheet_numfmt.ts  (주인 B)
 * 숫자 형식 코드 → 보이는 글 — 엑셀 코드 부분 집합: 일반 · `0` `#` `?` `.` `,`(천 단위 · 끝 쉼표 = 천으로 나눔) ·
 * 구역 `;`(양 · 음 · 0 · 글) · `"글"` · `\x` · `_x`(폭만큼 띄움) · `*x`(채움) · `[Red]` 등 색 · `%` · `@` · `E+00`.
 * 실무 형식(`0.00` · `_-* #,##0.00_-;\-* #,##0.00_-;_-* "-"_-;_-@_-` · `0.00_);[Red]\(0.00\)` …)은 모두 맞아야 함.
 * 끝수는 분수로 사사오입(엑셀 표시와 같음). 날짜 · 시간 형식은 1단계 밖(글 그대로).
 * ========================================================================== */

import {
  ZERO,
  cmp,
  div,
  frac,
  fracToString,
  mul,
  roundAt,
  toInteger,
  type Frac,
} from "@ui/sheet/ui_template_sheet_frac";
import type { ErrorValue, FormattedText, Scalar } from "./spreadsheet_types";

function isErrorScalar(v: Scalar): v is ErrorValue {
  return (
    typeof v === "object" && v !== null && "error" in (v as unknown as Record<string, unknown>)
  );
}

function groupThousands(digits: string): string {
  return digits.replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

// ── 구역 나누기(`;` · 따옴표 · `\` 뒤는 안 나눔) ─────────────────────────────

function splitSections(code: string): string[] {
  const sections: string[] = [];
  let cur = "";
  let inQuote = false;
  for (let i = 0; i < code.length; i++) {
    const ch = code[i];
    if (ch === '"') {
      inQuote = !inQuote;
      cur += ch;
      continue;
    }
    if (ch === "\\" && i + 1 < code.length) {
      cur += ch + code[i + 1];
      i++;
      continue;
    }
    if (ch === ";" && !inQuote) {
      sections.push(cur);
      cur = "";
      continue;
    }
    cur += ch;
  }
  sections.push(cur);
  return sections;
}

const COLOR_NAMES = ["black", "white", "red", "green", "blue", "yellow", "magenta", "cyan"];

function extractColor(section: string): { rest: string; color?: string } {
  let color: string | undefined;
  const rest = section.replace(/\[([^\]]+)\]/g, (_m, inner: string) => {
    const lower = inner.toLowerCase();
    if (COLOR_NAMES.includes(lower)) color = lower;
    return ""; // 조건 태그(`[>100]` 등)는 1단계에서 무시
  });
  return { rest, color };
}

// ── 낱말 나누기 ──────────────────────────────────────────────────────────

type Tok =
  | { k: "digit"; ch: "0" | "#" | "?" }
  | { k: "comma" }
  | { k: "point" }
  | { k: "percent" }
  | { k: "text" }
  | { k: "lit"; ch: string };

function tokenize(s: string): { toks: Tok[]; fillChar?: string } {
  const toks: Tok[] = [];
  let fillChar: string | undefined;
  for (let i = 0; i < s.length; i++) {
    const ch = s[i];
    if (ch === '"') {
      let j = i + 1;
      while (j < s.length && s[j] !== '"') {
        toks.push({ k: "lit", ch: s[j] });
        j++;
      }
      i = j;
      continue;
    }
    if (ch === "\\" && i + 1 < s.length) {
      toks.push({ k: "lit", ch: s[i + 1] });
      i++;
      continue;
    }
    if (ch === "_" && i + 1 < s.length) {
      toks.push({ k: "lit", ch: " " });
      i++;
      continue;
    }
    if (ch === "*" && i + 1 < s.length) {
      fillChar = s[i + 1];
      i++;
      continue;
    }
    if (ch === "0" || ch === "#" || ch === "?") {
      toks.push({ k: "digit", ch });
      continue;
    }
    if (ch === ",") {
      toks.push({ k: "comma" });
      continue;
    }
    if (ch === ".") {
      toks.push({ k: "point" });
      continue;
    }
    if (ch === "%") {
      toks.push({ k: "percent" });
      continue;
    }
    if (ch === "@") {
      toks.push({ k: "text" });
      continue;
    }
    toks.push({ k: "lit", ch });
  }
  return { toks, fillChar };
}

// ── 수 구역 그리기 ───────────────────────────────────────────────────────

function renderNumericSection(toks: Tok[], magnitude: Frac): string {
  const pointIdx = toks.findIndex((t) => t.k === "point");
  const hasPercent = toks.some((t) => t.k === "percent");
  const scaledMag = hasPercent ? mul(magnitude, frac(100n)) : magnitude;

  let lastDigit = -1;
  toks.forEach((t, i) => {
    if (t.k === "digit") lastDigit = i;
  });

  let scale = 0;
  for (let i = lastDigit + 1; i < toks.length; i++) if (toks[i].k === "comma") scale++;

  let hasGrouping = false;
  const introEnd = pointIdx >= 0 ? pointIdx : toks.length;
  for (let i = 0; i < introEnd && i <= lastDigit; i++)
    if (toks[i].k === "comma") hasGrouping = true;

  const intRun = pointIdx >= 0 ? toks.slice(0, pointIdx) : toks;
  const fracRun = pointIdx >= 0 ? toks.slice(pointIdx + 1) : [];
  const intDigitToks = intRun.filter((t): t is Extract<Tok, { k: "digit" }> => t.k === "digit");
  const fracDigitToks = fracRun.filter((t): t is Extract<Tok, { k: "digit" }> => t.k === "digit");

  const scaleDiv = scale > 0 ? 1000n ** BigInt(scale) : 1n;
  const adjusted = scaleDiv === 1n ? scaledMag : div(scaledMag, frac(scaleDiv));

  const rounded = roundAt(adjusted, fracDigitToks.length, "round");
  const scaleUp = frac(10n ** BigInt(fracDigitToks.length));
  const scaledInt = toInteger(mul(rounded, scaleUp), "round");
  const allDigits = scaledInt.toString().padStart(fracDigitToks.length + 1, "0");
  const rawIntStr =
    fracDigitToks.length > 0 ? allDigits.slice(0, -fracDigitToks.length) : allDigits;
  const rawFracStr = fracDigitToks.length > 0 ? allDigits.slice(-fracDigitToks.length) : "";

  let intStr = rawIntStr;
  if (intDigitToks.length > intStr.length) {
    const need = intDigitToks.length - intStr.length;
    let pad = "";
    for (let i = 0; i < need; i++) pad += intDigitToks[i].ch === "0" ? "0" : "";
    intStr = pad + intStr;
  }
  if (hasGrouping) intStr = groupThousands(intStr);

  let keepUntil = fracDigitToks.length;
  for (let i = fracDigitToks.length - 1; i >= 0; i--) {
    if (fracDigitToks[i].ch === "0") break;
    if (rawFracStr[i] !== "0") break;
    keepUntil = i;
  }
  const fracStr = rawFracStr.slice(0, keepUntil);

  let out = "";
  let intEmitted = false;
  let fracEmitted = false;
  for (let i = 0; i < toks.length; i++) {
    const t = toks[i];
    if (t.k === "digit" || t.k === "comma") {
      const inFrac = pointIdx >= 0 && i > pointIdx;
      if (inFrac) {
        if (!fracEmitted) {
          out += fracStr;
          fracEmitted = true;
        }
      } else if (!intEmitted) {
        out += intStr;
        intEmitted = true;
      }
      continue;
    }
    if (t.k === "point") {
      if (fracStr.length > 0) out += ".";
      continue;
    }
    if (t.k === "percent") {
      out += "%";
      continue;
    }
    if (t.k === "text") continue; // 수 구역엔 의미 없음(방어)
    out += t.ch;
  }
  return out;
}

function generalFormat(value: Frac): string {
  return fracToString(value);
}

function chooseSection(sections: string[], value: Frac): { code: string; forceMinus: boolean } {
  const isNeg = cmp(value, ZERO) < 0;
  const isZero = cmp(value, ZERO) === 0;
  if (sections.length === 1) return { code: sections[0], forceMinus: isNeg };
  if (sections.length === 2) {
    return isNeg
      ? { code: sections[1], forceMinus: false }
      : { code: sections[0], forceMinus: false };
  }
  if (isZero) return { code: sections[2] ?? sections[0], forceMinus: false };
  if (isNeg) return { code: sections[1], forceMinus: false };
  return { code: sections[0], forceMinus: false };
}

function formatNumber(value: Frac, code: string | undefined): FormattedText {
  const trimmed = code?.trim();
  if (!trimmed || trimmed.toLowerCase() === "general") {
    return { 글: generalFormat(value), 정렬: "right" };
  }
  const sections = splitSections(trimmed);
  const { code: chosen, forceMinus } = chooseSection(sections, value);
  const { rest, color } = extractColor(chosen);
  const { toks, fillChar } = tokenize(rest);
  const extra: Partial<FormattedText> = {};
  if (color) extra.색 = color;
  if (fillChar) extra.채움글 = fillChar;
  if (!toks.some((t) => t.k === "digit")) {
    let out = "";
    for (const t of toks) if (t.k === "lit") out += t.ch;
    return { 글: out, 정렬: "right", ...extra };
  }
  const magnitude = cmp(value, ZERO) < 0 ? frac(-value.n, value.d) : value;
  const body = renderNumericSection(toks, magnitude);
  return { 글: (forceMinus ? "-" : "") + body, 정렬: "right", ...extra };
}

function formatText(value: string, code: string | undefined): FormattedText {
  const trimmed = code?.trim();
  if (!trimmed) return { 글: value, 정렬: "left" };
  const sections = splitSections(trimmed);
  // 구역 하나뿐(`;` 없음) = 그 구역이 수 · 글 모두에 적용(`General` 과 같은 이치) · 2~3 구역엔 글 자리가 없어 그대로.
  const textCode =
    sections.length >= 4 ? sections[3] : sections.length === 1 ? sections[0] : undefined;
  if (textCode === undefined) return { 글: value, 정렬: "left" };
  const { rest, color } = extractColor(textCode);
  const { toks, fillChar } = tokenize(rest);
  const extra: Partial<FormattedText> = {};
  if (color) extra.색 = color;
  if (fillChar) extra.채움글 = fillChar;
  let out = "";
  for (const t of toks) {
    if (t.k === "text") out += value;
    else if (t.k === "lit") out += t.ch;
    else if (t.k === "percent") out += "%";
  }
  return { 글: out, 정렬: "left", ...extra };
}

/** `code` 없음 = 일반(수는 유효 11 자리 안쪽 · 칸 폭은 격자 몫) · 오류 값은 코드 글 그대로 */
export function formatValue(value: Scalar, code: string | undefined): FormattedText {
  if (isErrorScalar(value)) return { 글: value.error, 정렬: "center" };
  if (value === null) return { 글: "", 정렬: "right" };
  if (typeof value === "boolean") return { 글: value ? "TRUE" : "FALSE", 정렬: "center" };
  if (typeof value === "string") return formatText(value, code);
  return formatNumber(value, code);
}