import { compute } from "./calc.js";
// 줄 쌓기 단가산출 시험 — 엑셀 「단가산출」 블록 글 → 줄(일곱 종류로 읽히는 만큼 · 못 읽는 줄은 글 줄)
const NUM = /^-?[\d,]*\.?\d+\.?$|^-?\d[\d,]*\.$/;
const isNum = (t) => NUM.test(t);
const num = (t) => Number(String(t).replace(/,/g, "").replace(/\.$/, ""));
const clean = (t) =>
  String(t)
    .replace(/(\d)\.(?!\d)/g, "$1")
    .replace(/,(?=\d{3})/g, "");
const OPS = ["×", "÷", "/", "*"];
const KEY = { 노무비: "l", 재료비: "m", 경비: "e" };

/** 「× 4 인 ÷ 170 ㎡」 → 꼬리 [{op, v, u}] · 괄호 등 못 읽으면 null */
export function parseOps(s, known = {}) {
  const tk = s.trim().split(/\s+/).filter(Boolean);
  const ops = [];
  let i = 0;
  while (i < tk.length) {
    const op = tk[i] === "*" ? "×" : tk[i];
    let v = tk[i + 1];
    if (!OPS.includes(tk[i]) || v === undefined) return null;
    if (isNum(v)) {
      v = clean(v);
      // 값이 위 공식의 Q · QH 와 같으면 이름으로 이음(틀을 고치면 따라 바뀜)
      const hit = Object.entries(known).find(([n, val]) => /^Q/.test(n) && String(val) === v);
      if (hit) v = hit[0];
    } else if (!/^[A-Za-z]\w*$/.test(v)) return null;
    i += 2;
    const u = [];
    while (i < tk.length && !OPS.includes(tk[i])) u.push(tk[i++]);
    if (u.some((x) => /[()]/.test(x))) return null;
    ops.push({ op, v, u: u.join(" ") });
  }
  return ops;
}

/** 「q = 0.7 ㎥ K = 0.55 f = 1. / 1.325 = 0.75」 → 줄 [{n, x, u}] */
export function parseDefs(line) {
  const re = /(^|\s)([A-Za-z][A-Za-z0-9]*)\s*=\s/g;
  const starts = [];
  let m;
  while ((m = re.exec(line))) {
    const before = line.slice(starts.length ? starts.at(-1).body : 0, m.index).trim();
    if (starts.length && /[+\-×÷*/(]$/.test(before)) continue;
    starts.push({ n: m[2], at: m.index, body: m.index + m[0].length });
  }
  return starts.map((s, i) => {
    const seg = line.slice(s.body, starts[i + 1]?.at ?? line.length).trim();
    const parts = seg.split(/\s=\s/);
    const last = parts.at(-1).trim();
    const lm = last.match(/^(-?[\d,]*\.?\d+\.?)\s*(.*)$/);
    if (parts.length === 1)
      return { n: s.n, x: lm ? clean(lm[1]) : clean(last), u: lm ? lm[2] : "" };
    return { n: s.n, x: clean(parts[0]), u: lm ? lm[2] : "", got: lm ? num(lm[1]) : null };
  });
}

/** 율 머리 「이름 ( 노무비의 1 % )」 + 다음 줄 「38,290.7 × 1. % = 382.9」 → 율 줄 */
function rateHead(s, next) {
  const m = s.match(/^(.*?)\s*\(\s*(\S+?)의\s*([\d.]+)\s*%\s*\)\s*$/);
  if (!m || !/×\s*[\d.]+\s*%\s*=/.test(next ?? "")) return null;
  const bc = /노무/.test(m[2]) ? "l" : /경비/.test(m[2]) ? "e" : "m";
  return { k: "rate", name: m[1], of: m[2], baseCol: bc, rate: String(num(m[3])), col: "m" };
}

/** 분수 세 줄(분자 · 「Q = ─ … = 23.39 ㎥ / hr」 · 분모) → 줄 하나 · 기호 반 · 값 반으로 나눔 */
function parseFrac(top, mid, bot) {
  const mm = mid.match(/^([A-Za-z][A-Za-z0-9]*)\s*=\s*(.*)$/);
  if (!mm) return null;
  const parts = mm[2].split(/\s=\s/);
  const sym = parts[0];
  const groups = sym.match(/─(\s*─)*/g) ?? [];
  const half = (s) => {
    const t = s.trim().split(/\s+/);
    return t.length % 2 ? null : t.slice(0, t.length / 2);
  };
  const a = half(top);
  const b = half(bot);
  if (!a || !b || !groups.length) return null;
  if (groups.length > 1 && (a.length !== groups.length || b.length !== groups.length)) return null;
  let k = 0;
  const x = sym.replace(/─(\s*─)*/g, () => {
    const [na, nb] = groups.length > 1 ? [a[k], b[k]] : [a.join(" "), b.join(" ")];
    k++;
    return `(${na}) / (${nb})`;
  });
  const tail = parts
    .at(-1)
    .trim()
    .match(/^(-?[\d,]*\.?\d+\.?)\s*(.*)$/);
  return {
    n: mm[1],
    x: clean(x),
    u: tail && parts.length > 1 ? tail[2] : "",
    got: tail ? num(tail[1]) : null,
  };
}

export function parsePaste(text) {
  const lines = String(text)
    .replace(/\t/g, " ")
    .split(/\r?\n/)
    .map((s) => s.replace(/\s+/g, " ").trim());
  const doc = { name: "붙여넣은 단가산출", unit: "", items: [] };
  let expect = null;
  let item = null;
  let summary = false;
  let pendingBase = "";
  let skipRate = false;
  const known = {};
  const sums = { l: [], m: [], e: [] };
  const stat = { read: 0, text: 0 };
  const cur = () => item ?? ((item = { title: "", lines: [] }), doc.items.push(item), item);
  const add = (ln) => (cur().lines.push(ln), ln.k === "text" ? stat.text++ : stat.read++);
  const formula = () => {
    const last = cur().lines.at(-1);
    if (last?.k === "formula") return last;
    const f = { k: "formula", tpl: null, rows: [] };
    add(f);
    return f;
  };
  const addRow = (r) => {
    formula().rows.push({ n: r.n, x: r.x, u: r.u });
    if (r.got != null) known[r.n] = String(r.got);
    else if (isNum(r.x)) known[r.n] = r.x;
  };
  for (let i = 0; i < lines.length; i++) {
    const s = lines[i];
    if (!s || /^단가산출$|^산 ?출 ?근 ?거/.test(s)) continue;
    let m = s.match(/^(\d+)\.(\S.*?)\[(.+?)\]\s*([\d,]+)?\s*([\d,]+)?\s*([\d,]+)?\s*([\d,]+)?\s*$/);
    if (m && !doc.items.length) {
      doc.name = m[2].trim();
      doc.unit = m[3];
      if (m[4])
        expect = { sum: num(m[4]), l: num(m[5] ?? 0), m: num(m[6] ?? 0), e: num(m[7] ?? 0) };
      continue;
    }
    // 분수 세 줄
    if (lines[i + 1]?.includes("─")) {
      const r = parseFrac(s, lines[i + 1], lines[i + 2] ?? "");
      if (r) {
        addRow(r);
        i += 2;
        continue;
      }
      for (const t of [s, lines[i + 1], lines[i + 2] ?? ""]) add({ k: "text", text: t });
      i += 2;
      continue;
    }
    if ((m = s.match(/^(\d+)\s*\.\s+(.*)$/)) || (m = s.match(/^([가-하])\s*\.\s+(.*)$/))) {
      summary = /^(합계|소계)$/.test(m[2].replace(/\s/g, ""));
      if (summary) continue;
      item = { title: m[2], lines: [], ...(/[가-하]/.test(m[1]) ? { sub: true } : {}) };
      doc.items.push(item);
      const rm = rateHead(m[2], lines[i + 1]);
      if (rm) {
        add({ ...rm, name: "", scope: "all", baseName: "" });
        pendingBase = "";
        i++;
      }
      continue;
    }
    const key = s.split(":")[0].replace(/\s/g, "");
    if (summary && /^(노무비|재료비|경비|계)$/.test(key)) {
      if (KEY[key]) {
        const nums =
          s
            .slice(s.indexOf(":") + 1)
            .split("=")[0]
            .match(/[\d,]+\.?\d*/g) ?? [];
        sums[KEY[key]].push(...nums.map(num));
      }
      continue;
    }
    if (/^소계$/.test(key)) continue;
    if (s.includes(":") && /소계$/.test(key)) {
      pendingBase = key.replace(/소계$/, "");
      continue;
    }
    // 율 줄 머리 「이름 ( 노무비의 1 % )」 + 다음 줄 「38,290.7 × 1. % = 382.9」
    const rm = rateHead(s, lines[i + 1]);
    if (rm) {
      add({ ...rm, baseName: pendingBase, scope: "item" });
      pendingBase = "";
      i++;
      continue;
    }
    // 「q = 0.7 K = 0.55」 값 · 식 줄
    if (/^[A-Za-z][A-Za-z0-9]*\s*=\s/.test(s) && !s.includes(":")) {
      parseDefs(s).forEach(addRow);
      continue;
    }
    // 「노무비 : 59,020 ÷ 23.39 = 2,523.3」 셋 → 기계 · 참조 줄
    if (KEY[key] && s.includes(":")) {
      const rhs = s
        .slice(s.indexOf(":") + 1)
        .split("=")[0]
        .trim();
      const pm = rhs.match(/^([\d,]+\.?)\s+(.*)$/);
      const ops = pm && parseOps(pm[2], known);
      if (!pm || !ops) {
        if (rhs) add({ k: "text", text: s });
        continue;
      }
      const c = KEY[key];
      let last = cur().lines.at(-1);
      if (!(
        last &&
        (last.k === "mach" || last.k === "ref") &&
        !(c in last.res) &&
        last.res._open
      )) {
        const ref = (item?.title ?? "").match(/단산\s*(\d+)\s*참조/);
        last = ref
          ? { k: "ref", res: { no: Number(ref[1]), name: item.title, _open: true }, ops }
          : { k: "mach", res: { name: item?.title ?? "", _open: true }, ops };
        add(last);
      }
      last.res[c] = num(pm[1]);
      if (JSON.stringify(ops) !== JSON.stringify(last.ops)) (last.cops ??= {})[c] = ops;
      continue;
    }
    // 「치즐 ( 223,000. × 0.006 ) ÷ 5.」 → 괄호 걷음(곱나눔 차례 그대로라 값 같음)
    const s2 = s.replace(/\(\s*([\d,]+\.?\s+[×÷][^()]*?)\s*\)/, "$1");
    // 「보통인부 : 172,068 ÷ 8. ÷ 23.39 = 919.5」 → 인력
    if ((m = s2.match(/^([^:]+?)\s*:\s*([\d,]+\.?)\s+([×÷/*].*?)\s*=\s*[\d,.]+/))) {
      const ops = parseOps(m[3], known);
      if (ops) {
        add({ k: "labor", res: { name: m[1], price: num(m[2]) }, ops });
        continue;
      }
    }
    // 「합판(내수),대전 (…) 11,455. × 1.03 ㎡ × 38. % = 4,483.4」 → 재료
    if ((m = s2.match(/^(.*\S)\s+([\d,]+\.?)\s+([×÷/*].*?)\s*=\s*[\d,.]+/)) && !s.includes(":")) {
      const ops = parseOps(m[3], known);
      if (ops) {
        add({ k: "mat", col: "m", res: { name: m[1], price: num(m[2]) }, ops });
        continue;
      }
    }
    add({ k: "text", text: s });
  }
  for (const it of doc.items) for (const ln of it.lines) if (ln.res) delete ln.res._open;
  // 율 줄이 든 비목 = 합계 줄에 그 값이 놓인 칸
  const res = compute(doc);
  doc.items.forEach((it, ii) =>
    it.lines.forEach((ln, li) => {
      if (ln.k !== "rate") return;
      const v = Object.values(res.items[ii].lines[li].cols)[0];
      const col =
        ["m", "e", "l"].find((c) => sums[c].includes(v)) ??
        ["m", "e", "l"].find((c) => sums[c].includes(Math.floor(v)));
      if (col) ln.col = col;
    }),
  );
  return { doc, expect, stat };
}