/* =============================================================================
 * M01_MasterData_UI_Test_A.ts
 * 방식 A — 질문·답 마법사: 공종 → 조건 질문(한 번에 하나) → 재료·기계 고르기 → 결과 호표
 * 식은 안 보임 · 시험 계산은 로직 화면과 같은 `/calc` · 저장 없음
 * ========================================================================== */

import { createButton, createSelectField, el, showToast } from "@ui/ui_template_elements";
import {
  fetchLogic,
  runCalc,
  searchElements,
  type CalcAnswer,
  type ElementBrief,
  type HoLine,
  type LogicInput,
  type LogicOne,
} from "./M01_MasterData_UI_Logic_Api";
import { formatNumber } from "./M01_MasterData_UI_Logic_Edit";
import { tt } from "./M01_MasterData_UI_Test_Text";

type Step =
  { kind: "job" } | { kind: "ask"; spec: LogicInput } | { kind: "pick" } | { kind: "result" };

const PICKABLE = ["재료", "기계"];

export function render(host: HTMLElement, logicKey: string): void {
  host.replaceChildren(el("p", { className: "m01-test__muted", text: tt("Loading") }));
  fetchLogic(logicKey)
    .then((one) => wizard(host, one))
    .catch((error) => showToast(error instanceof Error ? error.message : tt("Failed"), "error"));
}

function wizard(host: HTMLElement, one: LogicOne): void {
  const { logic } = one;
  const values: Record<string, string> = {};
  const swaps = new Map<number, ElementBrief>();
  const lines = (logic.호표 ?? [])
    .map((line, i) => ({ line, i }))
    .filter((x) => PICKABLE.includes(x.line.종류));
  const steps: Step[] = [
    { kind: "job" },
    ...(logic.입력 ?? []).map((spec): Step => ({ kind: "ask", spec })),
    ...(lines.length ? [{ kind: "pick" } as Step] : []),
    { kind: "result" },
  ];
  let at = 0;

  const go = (next: number): void => {
    at = next;
    draw();
  };

  const frame = (
    title: string,
    note: string,
    content: HTMLElement[],
    nextOk: boolean,
  ): HTMLButtonElement => {
    const last = steps[at].kind === "result";
    const back = createButton({ label: tt("Back"), variant: "ghost", onClick: () => go(at - 1) });
    back.disabled = at === 0;
    const next = createButton({ label: tt("Next"), onClick: () => go(at + 1) });
    next.disabled = !nextOk;
    const again = createButton({ label: tt("Again"), variant: "ghost", onClick: () => go(0) });
    host.replaceChildren(
      el("div", {
        className: "m01-test__card",
        children: [
          el("p", {
            className: "m01-test__step",
            text: tt("Step", { n: at + 1, total: steps.length }),
          }),
          el("h3", { text: title }),
          ...(note ? [el("p", { className: "m01-test__muted", text: note })] : []),
          ...content,
          el("div", { className: "m01-test__nav", children: last ? [back, again] : [back, next] }),
        ],
      }),
    );
    return next;
  };

  const draw = (): void => {
    const step = steps[at];
    if (step.kind === "job") {
      frame(
        `${logic.원문번호} ${logic.이름}`,
        tt("Job_Note"),
        [el("p", { text: `${tt("Job_Title")} · ${logic.결과단위}` })],
        true,
      );
    } else if (step.kind === "ask") drawAsk(step.spec);
    else if (step.kind === "pick") drawPick();
    else void drawResult();
  };

  const drawAsk = (spec: LogicInput): void => {
    const name = spec.이름;
    const ready = (): boolean => (values[name] ?? "").trim() !== "";
    let next: HTMLButtonElement | null = null;
    const changed = (v: string): void => {
      values[name] = v;
      if (next) next.disabled = !ready();
    };
    let control: HTMLElement;
    if (spec.고르기?.length) {
      control = createSelectField({
        options: ["", ...spec.고르기.map(String)].map((o) => ({ value: o, text: o })),
        value: values[name] ?? "",
        onChange: changed,
      }).root;
    } else {
      const box = el("input", {
        className: "m01-test__input",
        attrs: { type: "text", inputmode: "decimal" },
      });
      box.value = values[name] ?? "";
      box.addEventListener("input", () => changed(box.value));
      control = box;
    }
    const question = spec.고르기?.length
      ? tt("Ask_Pick", { name })
      : tt("Ask_Number", { name, unit: spec.단위 ? ` (${spec.단위})` : "" });
    const hint = spec.범위 ? tt("Ask_Range", { min: spec.범위[0], max: spec.범위[1] }) : "";
    next = frame(question, hint, [control], ready());
  };

  const drawPick = (): void => {
    const rows = lines.map(({ line, i }) => pickRow(line, i));
    frame(
      tt("Mat_Title"),
      tt("Mat_Note"),
      rows.length ? rows : [el("p", { text: tt("Mat_None") })],
      true,
    );
  };

  const pickRow = (line: HoLine, i: number): HTMLElement => {
    const price = one.prices[line.요소]?.값;
    const found = new Map<string, ElementBrief>();
    const select = createSelectField({
      options: [{ value: "", text: tt("Mat_Default") }],
      value: "",
      onChange: (ref) => {
        const item = found.get(ref);
        if (item) swaps.set(i, item);
        else swaps.delete(i);
      },
    });
    void searchElements(line.종류, line.이름 ?? "")
      .then((r) => {
        r.items.forEach((it) => found.set(it.ref, it));
        select.setOptions(
          [
            { value: "", text: tt("Mat_Default") },
            ...r.items.map((it) => ({
              value: it.ref,
              text: [`${it.이름 ?? ""} ${it.규격 ?? ""}`.trim(), formatNumber(it.값)]
                .filter(Boolean)
                .join(" · "),
            })),
          ],
          swaps.get(i)?.ref ?? "",
        );
      })
      .catch(() => undefined);
    const spec = line.규격 ? ` ${line.규격}` : "";
    const unit = line.단위 ?? "";
    const cost =
      price !== undefined && price !== null ? ` · ${tt("Mat_Price")} ${formatNumber(price)}` : "";
    return el("div", {
      className: "m01-test__pick",
      children: [
        el("strong", { text: `${line.종류} · ${line.이름 ?? line.요소}${spec}` }),
        el("span", { className: "m01-test__muted", text: `${unit}${cost}` }),
        select.root,
      ],
    });
  };

  const drawResult = async (): Promise<void> => {
    const inputs: Record<string, unknown> = {};
    for (const spec of logic.입력 ?? []) {
      const raw = (values[spec.이름] ?? "").trim();
      if (raw === "") continue;
      const option = spec.고르기?.find((o) => String(o) === raw);
      inputs[spec.이름] =
        option !== undefined ? option : Number.isNaN(Number(raw)) ? raw : Number(raw);
    }
    // 바꿔 본 재료·기계가 있으면 복사본으로만 셈 — 정본 로직은 그대로
    const row = swaps.size
      ? {
          ...logic,
          호표: (logic.호표 ?? []).map((l, i) => {
            const s = swaps.get(i);
            return s ? { ...l, 요소: s.ref, 이름: s.이름 ?? l.이름, 규격: s.규격 ?? l.규격 } : l;
          }),
        }
      : undefined;
    let answer: CalcAnswer;
    try {
      answer = await runCalc({ key: logic.키, inputs, ...(row ? { row, file: one.file } : {}) });
    } catch (error) {
      showToast(error instanceof Error ? error.message : tt("Failed"), "error");
      return;
    }
    frame(tt("Result_Title"), "", resultView(answer), true);
  };

  draw();
}

function resultView(answer: CalcAnswer): HTMLElement[] {
  if (!answer.ok) {
    return [
      el("div", {
        className: "m01-test__reasons",
        children: [
          el("strong", { text: tt("Result_Stopped") }),
          el("div", { text: answer.reason }),
        ],
      }),
    ];
  }
  const out: HTMLElement[] = [];
  if (answer.lines) {
    out.push(
      el("table", {
        className: "m01-test__grid",
        children: [
          el("thead", {
            children: [
              el("tr", {
                children: [tt("Col_Name"), tt("Col_Qty"), tt("Col_Amount")].map((h) =>
                  el("th", { text: h }),
                ),
              }),
            ],
          }),
          el("tbody", {
            children: answer.lines.map((l) =>
              el("tr", {
                children: [
                  el("td", { text: l.출처 ? `${l.이름} (${l.출처})` : l.이름 }),
                  el("td", { text: `${formatNumber(l.수량)} ${l.단위}` }),
                  el("td", { className: "m01-test__money", text: formatNumber(l.금액) }),
                ],
              }),
            ),
          }),
        ],
      }),
    );
  }
  if (answer.sums) {
    out.push(
      el("p", {
        className: "m01-test__total",
        attrs: { "data-total": String(answer.sums["계"] ?? 0) },
        text: `${tt("Sum_Total")} ${formatNumber(answer.sums["계"] ?? 0)}`,
      }),
    );
  }
  if (answer.result !== undefined) {
    out.push(
      el("p", {
        className: "m01-test__total",
        attrs: { "data-total": String(answer.result) },
        text: `${tt("Sum_Result")} ${formatNumber(answer.result)}`,
      }),
    );
  }
  return out;
}