/* =============================================================================
 * M01_MasterData_UI_Logic_Calc.ts
 * 시험 계산 — 받을 값을 넣고 [계산] → 줄별 금액 · 비목 합 · 멈춘 까닭(엔진 글 그대로)
 * 고친 로직은 저장 전 줄(`row`)을 같이 보내 메모리에서 셈(`POST /calc`) — 파일에 안 씀
 * ========================================================================== */

import { createButton, el, showToast } from "@ui/ui_template_elements";
import {
  runCalc,
  type CalcAnswer,
  type CalcLine,
  type LogicRow,
} from "./M01_MasterData_UI_Logic_Api";
import { formatNumber } from "./M01_MasterData_UI_Logic_Edit";
import { tx } from "./M01_MasterData_UI_Logic_Text";

export interface CalcContext {
  book: string;
  /** 저장된 열쇠 — 새 로직은 null */
  savedKey: string | null;
  file: string;
  row: LogicRow;
  dirty: () => boolean;
  /** 로직마다 넣은 값 — 다시 그려도 남음 */
  values: Record<string, string>;
  onLines: (lines: CalcLine[] | null) => void;
}

const SUMS = ["노무비", "재료비", "경비", "계"];

export function buildCalc(host: HTMLElement, ctx: CalcContext): void {
  const fields = (ctx.row.입력 ?? []).map((spec) => {
    const name = spec.이름;
    let control: HTMLInputElement | HTMLSelectElement;
    if (spec.고르기?.length) {
      control = el("select", { className: "m01-logic__input" });
      for (const option of ["", ...spec.고르기.map(String)]) {
        control.append(el("option", { text: option, attrs: { value: option } }));
      }
    } else {
      control = el("input", {
        className: "m01-logic__input",
        attrs: { type: "text", inputmode: "decimal" },
      });
      if (spec.범위) control.placeholder = `${spec.범위[0]} ∼ ${spec.범위[1]}`;
    }
    control.value = ctx.values[name] ?? "";
    control.addEventListener("input", () => (ctx.values[name] = control.value));
    control.addEventListener("change", () => (ctx.values[name] = control.value));
    const label = spec.단위 ? `${name} (${spec.단위})` : name;
    return el("label", {
      className: "m01-logic__field",
      children: [el("span", { text: label }), control],
    });
  });
  const out = el("div", { className: "m01-logic__calc-out" });
  const run = async (): Promise<void> => {
    const inputs: Record<string, unknown> = {};
    for (const spec of ctx.row.입력 ?? []) {
      const raw = (ctx.values[spec.이름] ?? "").trim();
      if (raw === "") continue; // 빈 칸은 안 보냄 — 엔진이 「입력 없음」 으로 멈춤
      // 고르기는 원래 값(수면 수) 그대로 — 글 "35" 로 보내면 「고르기 밖」
      const option = spec.고르기?.find((o) => String(o) === raw);
      inputs[spec.이름] =
        option !== undefined ? option : Number.isNaN(Number(raw)) ? raw : Number(raw);
    }
    const draft = ctx.dirty() || ctx.savedKey === null;
    try {
      const answer = await runCalc({
        book: ctx.book,
        key: ctx.savedKey ?? ctx.row.열쇠,
        inputs,
        ...(draft ? { row: ctx.row, file: ctx.file } : {}),
      });
      ctx.onLines(answer.ok ? (answer.lines ?? null) : null);
      out.replaceChildren(...answerView(answer, draft));
    } catch (error) {
      showToast(error instanceof Error ? error.message : tx("Load_Failed"), "error");
    }
  };
  host.replaceChildren(
    el("h3", { text: tx("Calc_Title") }),
    ...(fields.length
      ? fields
      : [el("p", { className: "m01-logic__muted", text: tx("Calc_NoInputs") })]),
    createButton({ label: tx("Calc_Run"), onClick: () => void run() }),
    out,
  );
}

function answerView(answer: CalcAnswer, draft: boolean): HTMLElement[] {
  const note = draft ? [el("p", { className: "m01-logic__muted", text: tx("Calc_Draft") })] : [];
  if (!answer.ok) {
    return [
      ...note,
      el("div", {
        className: "m01-logic__reasons",
        children: [el("strong", { text: tx("Calc_Stopped") }), el("div", { text: answer.reason })],
      }),
    ];
  }
  const parts: HTMLElement[] = [...note];
  if (answer.lines) {
    const rows = answer.lines.map((line) =>
      el("tr", {
        children: [
          el("td", { text: line.출처 ? `${line.이름} (${line.출처})` : line.이름 }),
          el("td", { text: `${formatNumber(line.수량)} ${line.단위}` }),
          el("td", { className: "m01-logic__money", text: formatNumber(line.금액) }),
        ],
      }),
    );
    parts.push(
      el("table", {
        className: "m01-logic__grid",
        children: [
          el("thead", {
            children: [
              el("tr", {
                children: [tx("Head_Name"), tx("Ho_Qty"), tx("Ho_Amount")].map((h) =>
                  el("th", { text: h }),
                ),
              }),
            ],
          }),
          el("tbody", { children: rows }),
        ],
      }),
    );
  }
  if (answer.sums) {
    parts.push(
      el("dl", {
        className: "m01-logic__sums",
        children: SUMS.flatMap((k) => [
          el("dt", { text: k === "계" ? tx("Calc_Sum") : k }),
          el("dd", { className: "m01-logic__money", text: formatNumber(answer.sums?.[k] ?? 0) }),
        ]),
      }),
    );
  }
  if (answer.result !== undefined) {
    parts.push(
      el("dl", {
        className: "m01-logic__sums",
        children: [
          el("dt", { text: tx("Calc_Result") }),
          el("dd", { text: formatNumber(answer.result) }),
        ],
      }),
    );
  }
  const middle = Object.entries(answer.middle ?? {});
  if (middle.length) {
    parts.push(
      el("h4", { text: tx("Middle_Title") }),
      el("dl", {
        className: "m01-logic__sums",
        children: middle.flatMap(([k, v]) => [
          el("dt", { text: k }),
          el("dd", { text: formatNumber(v) }),
        ]),
      }),
    );
  }
  return parts;
}