/* =============================================================================
 * B09_Draft_Schedule_Calc.ts
 * B09 공기 셈 짝(PLAN 252-1 · 사용자 161번 · 초안 — draft 폴더째 지우면 사라짐).
 * 짝 = `B09_Draft_Schedule_Calc.py`(같은 식 · 거울 시험 `test_252_1_b09_schedule.py`) — 식 설명은 그쪽 머리.
 *   공기산출 = 설계내역서 항목 줄마다 ROUNDUP(시공량 × 반영률 ÷ 일작업량, 1) · 일작업량 = 장비 · 인력 · 입력
 *   공기집계 = 착공 연월부터 달마다 작업가능일수(달력 − (A + B − A×B÷달력))로 준비 → 작업 → 정리를 채움
 * ========================================================================== */

import { num, roundHalf, rounddown, roundup, type Row } from "../B09_Estimation_Calc_Base";

const HOURS = 8;
const CREW = 10;
const PREP_DOCS = 2;
const PREP_SETUP = 2;
const TIDY = 4;
const SKIP_TOP = ["4", "G"];
const OVERLAP_TOP = ["3"];
const MAX_MONTHS = 120;

const top = (section: unknown): string => String(section ?? "").split(".")[0];

function cfg(user: Row, key: string, fallback: number): number {
  const value = num(user[key]);
  return value === null || value < 0 ? fallback : value;
}

function workRow(item: Row, unit: Row | undefined, c: Row, hours: number): Row {
  const qty = num(item.qty) ?? 0;
  let rate = num(c.rate);
  if (rate === null) rate = OVERLAP_TOP.includes(top(item.section)) ? 0 : 100;
  const dailyIn = num(c.daily);
  const machine = unit?.machine as Row | null | undefined;
  const labor = num(unit?.labor);
  const out: Row = {
    kind: "item",
    key: item.key,
    name: item.name || "",
    spec: item.spec || "",
    unit: item.unit || "",
    lv: item.level || 1,
    qty,
    rate,
    basis: "",
    who: "",
    per: null,
    put: null,
    q: null,
    daily: null,
    daily_in: dailyIn,
    days: null,
  };
  let need: number;
  if (dailyIn !== null && dailyIn > 0) {
    Object.assign(out, { basis: "입력", daily: dailyIn });
    need = (qty * rate) / 100 / dailyIn;
  } else if (machine && (num(machine.hr) ?? 0) > 0) {
    const hr = num(machine.hr) as number;
    const units = num(c.units) || 1;
    Object.assign(out, { basis: "장비", who: machine.name || "", per: hr, put: units });
    Object.assign(out, { q: 1 / hr, daily: (hours * units) / hr });
    need = (((qty * rate) / 100) * hr) / (hours * units);
  } else if (labor !== null && labor > 0) {
    const crew = num(c.crew) || CREW;
    Object.assign(out, { basis: "인력", who: "인력", per: labor, put: crew, daily: crew / labor });
    need = (((qty * rate) / 100) * labor) / crew;
  } else {
    out.basis = "연결 없음";
    out.days = rate === 0 ? 0 : null; // 다 겹침 = 일작업량 없어도 0
    return out;
  }
  out.days = roundup(need, 1);
  return out;
}

/** 공기산출 — 설계내역서 차례(묶음 줄 = 그 아래 셀 줄이 있을 때만) · 준비 · 기타 · 정리 */
export function workTable(src: Row, billRows: Row[], user: Row): Row {
  const hours = cfg(user, "hours", HOURS) || HOURS;
  const units: Row = src.units || {};
  const cfgs: Row = user.rows || {};
  const rows: Row[] = [];
  let pending: Array<[Row, boolean]> = [];
  for (const row of billRows) {
    const level = row.level || 1;
    if (row.kind !== "item") {
      pending = pending.filter(([p]) => (p.level || 1) < level);
      pending.push([row, false]);
      continue;
    }
    const key = String(row.key ?? "");
    const qty = num(row.qty);
    if (
      SKIP_TOP.includes(top(row.section)) ||
      key.startsWith("mat:") ||
      key === "fee" ||
      qty === null ||
      qty <= 0
    )
      continue;
    for (const p of pending) {
      if (p[1]) continue;
      p[1] = true;
      rows.push({ kind: "head", key: p[0].key, name: p[0].name || "", lv: p[0].level || 1 });
    }
    rows.push(workRow(row, units[key], cfgs[key] || {}, hours));
  }
  const docs = cfg(user, "prep_docs", PREP_DOCS);
  const setup = cfg(user, "prep_setup", PREP_SETUP);
  const etc = cfg(user, "etc", 0);
  const tidy = cfg(user, "tidy", TIDY);
  const items = rows.filter((r) => r.kind === "item");
  const days = items.reduce((s: number, r) => s + (r.days || 0), 0);
  const subtotal = roundHalf(days + etc, 0);
  return {
    hours,
    rows,
    prep_docs: docs,
    prep_setup: setup,
    prep: docs + setup,
    etc,
    subtotal,
    tidy,
    total: roundHalf(docs + setup + subtotal + tidy, 0),
    missing: items.filter((r) => r.days === null).length,
  };
}

const monthDays = (year: number, month: number): number =>
  new Date(Date.UTC(year, month, 0)).getUTCDate();

const pad = (n: number): string => String(n).padStart(2, "0");

/** 그 달 법정공휴일 수(일요일 + 공휴일 겹침 한 번) · 공휴일 이름 */
function holidays(src: Row, year: number, month: number): [number, string[]] {
  const head = `${String(year).padStart(4, "0")}-${pad(month)}-`;
  const named = new Map<string, string>(
    ((src.holidays || {})[String(year)] || []).filter(([d]: [string]) => d.startsWith(head)),
  );
  let count = 0;
  for (let day = 1; day <= monthDays(year, month); day += 1) {
    const sunday = new Date(Date.UTC(year, month - 1, day)).getUTCDay() === 0;
    if (sunday || named.has(`${head}${pad(day)}`)) count += 1;
  }
  const names = [...named.entries()]
    .sort(([a], [b]) => (a < b ? -1 : a > b ? 1 : 0))
    .map(([d, n]) => `${Number(d.slice(-2))}일 ${n}`);
  return [count, names];
}

function climate(src: Row, user: Row, kind: string, month: number): number {
  const mine = num(((user.climate || {})[kind] || [])[month - 1]);
  if (mine !== null) return mine;
  return num(((src.climate || {})[kind] || [])[month - 1]) ?? 0;
}

/** 공기집계 — parts = [준비, 작업, 정리] 일수 · 착공 연월부터 채움 */
export function monthTable(src: Row, user: Row, parts: number[]): Row {
  const start: Row = { ...(src.start || {}), ...(user.start || {}) };
  let year = Math.trunc(Number(start.year) || 2000);
  let month = Math.trunc(Number(start.month) || 1);
  const left = parts.map((p) => Math.max(p, 0));
  const months: Row[] = [];
  let total = 0;
  while (left.reduce((s, v) => s + v, 0) > 0 || !months.length) {
    if (months.length >= MAX_MONTHS) break;
    const days = monthDays(year, month);
    const rain = climate(src, user, "rain", month);
    const heat = climate(src, user, "heat", month);
    const a = roundup(rain + heat, 1);
    const [auto, names] = holidays(src, year, month);
    const mine = num((user.holiday || {})[`${String(year).padStart(4, "0")}-${pad(month)}`]);
    const b = mine !== null ? mine : auto;
    const c = (a * b) / days;
    const off = rounddown(a + b - c, 0);
    const avail = days - off;
    const cap = Math.max(avail, 0);
    const use = [0, 0, 0];
    let room = cap;
    for (let i = 0; i < 3; i += 1) {
      const take = Math.min(room, left[i]);
      use[i] = take;
      left[i] -= take;
      room -= take;
    }
    const used = use[0] + use[1] + use[2];
    const offUsed = cap <= 0 ? days : used >= cap ? off : roundup((off * used) / cap, 0);
    const span = used + offUsed;
    total += span;
    months.push({
      year,
      month,
      days,
      rain,
      heat,
      a,
      b,
      b_auto: auto,
      names,
      c,
      off,
      avail,
      prep: use[0],
      work: use[1],
      tidy: use[2],
      used,
      off_used: offUsed,
      span,
    });
    if (month === 12) {
      year += 1;
      month = 1;
    } else month += 1;
  }
  const first = months[0];
  const end = new Date(Date.UTC(first.year, first.month - 1, 1) + (Math.max(total, 1) - 1) * 864e5);
  return {
    start: { year: first.year, month: first.month },
    months,
    days: total,
    months_n: roundHalf(total / 30, 1),
    end: end.toISOString().slice(0, 10),
  };
}

/** 공기 한 벌 — {work: 공기산출, calendar: 공기집계} */
export function computeSchedule(src: Row, billRows: Row[], user: Row): Row {
  const u = user || {};
  const work = workTable(src || {}, billRows || [], u);
  return {
    work,
    calendar: monthTable(src || {}, u, [work.prep, work.subtotal, work.tidy]),
  };
}