/* =============================================================================
 * M01_EasyCalc_Sheet.ts
 * 쉬운 단가산출 — 실무 일위대가표(읽기만) · 「설계 때 정하는 값」 띠(시험값만, 저장 안 됨)
 * 계약 = docs/raw/M01_쉬운단가/설계.md 3절 Sheet. 이 폴더째 지워도 됨.
 * ========================================================================== */

import { currentLanguageIndex } from "@ui/ui_template_locale";
import { createSelectField, el } from "@ui/ui_template_elements";
import {
  searchElements,
  type CalcAnswer,
  type CalcLine,
  type LogicInput,
} from "../M01_MasterData_UI_Logic_Api";
import { formatMoney, formatPrice } from "../M01_MasterData_UI_Logic_Money";
import { safeReason } from "../M01_MasterData_UI_Logic_Text";
import "./M01_EasyCalc_Sheet.css";

const TEXT = {
  Busy: ["계산 중", "Calculating"],
  Stopped: ["계산하지 못했어요", "Could not calculate"],
  Name: ["명칭", "Name"],
  Spec: ["규격", "Size"],
  Qty: ["수량", "Qty"],
  Unit: ["단위", "Unit"],
  Total: ["합계", "Total"],
  Labor: ["노무비", "Labor"],
  Material: ["재료비", "Material"],
  Expense: ["경비", "Expense"],
  Note: ["비고", "Note"],
  Price: ["단가", "Price"],
  Amount: ["금액", "Amount"],
  Strip: ["설계 때 정하는 값", "Values set at design time"],
  Trial: ["여기 값은 시험용 — 저장 안 됨", "Trial values only — not saved"],
  Range: ["{a} ∼ {b} 사이", "between {a} and {b}"],
  Pick: ["고르세요", "Choose"],
  Bad: ["숫자를 넣어 주세요", "Enter a number"],
  OutOfRange: ["범위 밖이에요", "Out of range"],
} as const;

const ts = (key: keyof typeof TEXT): string => TEXT[key][currentLanguageIndex];

const COSTS = ["노무비", "재료비", "경비"] as const;
const COST_HEAD = { 노무비: "Labor", 재료비: "Material", 경비: "Expense" } as const;

const qty = (n: number): string => n.toLocaleString("ko-KR", { maximumFractionDigits: 6 });
const cell = (text: string, className = ""): HTMLElement => el("td", { className, text });
const money = (text: string): HTMLElement => cell(text, "m01-easysheet__num");

/** 준용 · 산정 글에 붙은 마스터 번호는 뺌 */
const note = (line: CalcLine): string =>
  [line.출처?.replace(/[A-Z]{2}\d{6}\./g, ""), line.단위경고].filter(Boolean).join(" · ");

function lineRow(line: CalcLine): HTMLElement {
  // 비목별 단가 = 줄 단가 × (그 비목 금액 ÷ 줄 금액) — 금액 반올림 오차가 단가에 안 섞임
  const per = (k: string): number =>
    line.금액 ? (line.단가 * (line.비목?.[k] ?? 0)) / line.금액 : 0;
  return el("tr", {
    children: [
      cell(line.이름),
      cell(line.품목?.규격 ?? ""),
      money(qty(line.수량)),
      cell(line.단위),
      money(formatPrice(line.단가)),
      money(formatMoney(line.금액)),
      ...COSTS.flatMap((k) => [
        money(formatPrice(per(k))),
        money(formatMoney(line.비목?.[k] ?? 0)),
      ]),
      cell(note(line), "m01-easysheet__note"),
    ],
  });
}

/** 실무 일위대가표 — 읽기만 · 맨 아래 합계 줄 */
export function renderSheet(
  host: HTMLElement,
  head: { name: string; resultUnit: string },
  ans: CalcAnswer | null,
): void {
  const title = el("p", {
    className: "m01-easysheet__title",
    text: [head.name, head.resultUnit].filter(Boolean).join(" · "),
  });
  if (!ans || !ans.ok) {
    host.replaceChildren(
      title,
      el("p", {
        className: "m01-easysheet__status",
        text: ans ? `${ts("Stopped")} — ${safeReason(ans.reason)}` : ts("Busy"),
      }),
    );
    return;
  }
  const lines = ans.lines ?? [];
  const sums = ans.sums ?? {};
  const group = (label: string): HTMLElement =>
    el("th", { className: "m01-easysheet__group", text: label, attrs: { colspan: "2" } });
  const one = (label: string): HTMLElement => el("th", { text: label, attrs: { rowspan: "2" } });
  const pair = (): HTMLElement[] => [ts("Price"), ts("Amount")].map((h) => el("th", { text: h }));
  const table = el("table", {
    className: "m01-easysheet__table",
    children: [
      el("thead", {
        children: [
          el("tr", {
            children: [
              one(ts("Name")),
              one(ts("Spec")),
              one(ts("Qty")),
              one(ts("Unit")),
              group(ts("Total")),
              ...COSTS.map((k) => group(ts(COST_HEAD[k]))),
              one(ts("Note")),
            ],
          }),
          el("tr", { children: [...pair(), ...pair(), ...pair(), ...pair()] }),
        ],
      }),
      el("tbody", { children: lines.map(lineRow) }),
      el("tfoot", {
        children: [
          el("tr", {
            children: [
              el("th", { text: ts("Total"), attrs: { colspan: "4" } }),
              cell(""),
              money(formatMoney(sums["계"] ?? 0)),
              ...COSTS.flatMap((k) => [cell(""), money(formatMoney(sums[k] ?? 0))]),
              cell(""),
            ],
          }),
        ],
      }),
    ],
  });
  host.replaceChildren(title, el("div", { className: "m01-easysheet__scroll", children: [table] }));
}

/** 마스터 번호 꼴 고르기 값 → 이름(한 번 물은 것은 다시 안 물음) */
const KEY_RE = /^[A-Z]{2}\d{6}$/;
const KEY_GROUP: Record<string, string> = { MT: "재료", EQ: "기계", LB: "인력" };
const nameCache = new Map<string, string | null>();

async function keyName(key: string): Promise<string | null> {
  if (nameCache.has(key)) return nameCache.get(key)!;
  const group = KEY_GROUP[key.slice(0, 2)];
  let name: string | null = null;
  if (group) {
    try {
      const hit = (await searchElements(group, key)).items.find((it) => it.ref === key);
      name = hit ? `${hit.이름 ?? ""}${hit.규격 ? ` ${hit.규격}` : ""}`.trim() || null : null;
    } catch {
      name = null;
    }
  }
  nameCache.set(key, name);
  return name;
}

/** state = 띠가 들고 있는 시험값(고칠 때마다 같은 객체를 바꿈) · emit = 바뀐 값을 밖에 알림 */
type Trial = Record<string, unknown>;

function numberBox(spec: LogicInput, state: Trial, emit: () => void): HTMLElement {
  const [lo, hi] = spec.범위 ?? [];
  const hint = spec.범위 ? ts("Range").replace("{a}", String(lo)).replace("{b}", String(hi)) : "";
  const box = el("input", {
    className: "m01-easysheet__input",
    attrs: { type: "text", inputmode: "decimal", placeholder: hint },
  });
  const warn = el("span", { className: "m01-easysheet__warn" });
  box.value = state[spec.이름] === undefined ? "" : String(state[spec.이름]);
  box.addEventListener("change", () => {
    const raw = box.value.trim();
    const num = Number(raw);
    const bad = raw !== "" && Number.isNaN(num) ? ts("Bad") : "";
    const out = !bad && raw !== "" && spec.범위 && (num < lo! || num > hi!) ? ts("OutOfRange") : "";
    warn.textContent = bad || out;
    box.toggleAttribute("aria-invalid", !!(bad || out));
    if (bad) return;
    if (raw === "") delete state[spec.이름];
    else state[spec.이름] = num;
    emit();
  });
  return el("span", { className: "m01-easysheet__ctl", children: [box, warn] });
}

function pickBox(spec: LogicInput, state: Trial, emit: () => void): HTMLElement {
  const picks = spec.고르기 ?? [];
  const optionText = (o: string | number): string =>
    (typeof o === "string" && nameCache.get(o)) || String(o);
  const options = (): { value: string; text: string }[] => [
    { value: "", text: ts("Pick") },
    ...picks.map((o) => ({ value: String(o), text: optionText(o) })),
  ];
  const cur = state[spec.이름] === undefined ? "" : String(state[spec.이름]);
  const field = createSelectField({
    options: options(),
    value: cur,
    compact: true,
    ariaLabel: spec.이름,
    onChange: (v) => {
      const hit = picks.find((o) => String(o) === v); // 원래 값(수) 그대로 보냄
      if (hit === undefined) delete state[spec.이름];
      else state[spec.이름] = hit;
      emit();
    },
  });
  const keys = picks.filter((o): o is string => typeof o === "string" && KEY_RE.test(o));
  if (keys.length) {
    void Promise.all(keys.map(keyName)).then(() => field.setOptions(options(), cur));
  }
  return field.root;
}

/** 「설계 때 정하는 값」 띠 — 바꾸면 onChange(새 시험값) · 값이 없으면 띠를 숨김 */
export function renderTrialStrip(
  host: HTMLElement,
  inputs: LogicInput[],
  trial: Record<string, unknown>,
  onChange: (trial: Record<string, unknown>) => void,
): void {
  if (!inputs.length) {
    host.replaceChildren();
    host.hidden = true;
    return;
  }
  host.hidden = false;
  const state = { ...trial };
  const emit = (): void => onChange({ ...state });
  host.replaceChildren(
    el("strong", { className: "m01-easysheet__strip-title", text: ts("Strip") }),
    el("div", {
      className: "m01-easysheet__fields",
      children: inputs.map((spec) =>
        el("label", {
          className: "m01-easysheet__field",
          children: [
            el("span", { text: spec.단위 ? `${spec.이름} (${spec.단위})` : spec.이름 }),
            spec.고르기?.length ? pickBox(spec, state, emit) : numberBox(spec, state, emit),
          ],
        }),
      ),
    }),
    el("p", { className: "m01-easysheet__muted", text: ts("Trial") }),
  );
}