/* =============================================================================
 * M01_MasterData_UI_Logic_Wizard.ts
 * 「새로 만들기」 모달 — 질문 한 번에 하나 · 옆에 지금까지 만든 호표 미리보기
 * 걸음 = 이름 → 원문 절 → 중간 값 → 호표 줄 → 설계 입력 → 할증·끝수 → 시험 계산 → 저장
 * 시험 계산은 `POST /calc` 에 `row`+`file` 을 실어 보냄(파일에 안 씀) · 저장은 `POST /save` `add`
 * 걸음별 화면 = `_Wizard_Steps.ts` · 값 고르기 칸 = `_Wizard_Atom.ts` · 식 조립 = `_Wizard_Model.ts`
 * ========================================================================== */

import { createButton, el, showToast } from "@ui/ui_template_elements";
import {
  ApiError,
  fetchLogicFiles,
  runCalc,
  saveFiles,
  type CalcAnswer,
  type LogicFile,
} from "./M01_MasterData_UI_Logic_Api";
import { formatNumber } from "./M01_MasterData_UI_Logic_Edit";
import { select, textBox } from "./M01_MasterData_UI_Logic_Wizard_Atom";
import { searchLogics } from "./M01_MasterData_UI_Logic_Wizard_Api";
import {
  atomPlain,
  buildRow,
  collectInputs,
  emptyDraft,
  isMoney,
  middleText,
  qtyPlain,
  type Draft,
} from "./M01_MasterData_UI_Logic_Wizard_Model";
import { STEPS, type Step } from "./M01_MasterData_UI_Logic_Wizard_Steps";
import { tw } from "./M01_MasterData_UI_Logic_Wizard_Text";
import { plainReason } from "./M01_MasterData_UI_Test_Text";
import "./M01_MasterData_UI_Logic_Wizard_Style.css";

export interface WizardOptions {
  /** 저장이 끝나면 새 키와 함께 — 방식 C 로 여는 자리 */
  onSaved?: (key: string) => void;
}

const fail = (e: unknown): void =>
  showToast(e instanceof Error ? e.message : tw("Failed"), "error");

/** 「새로 만들기」 모달을 엶 */
export function openLogicWizard(options: WizardOptions = {}): void {
  const d: Draft = emptyDraft();
  let files: LogicFile[] = [];
  let at = 0;
  let answered = false;
  const testValues: Record<string, string> = {};

  const steps: Step[] = [
    ...STEPS,
    { key: "S_Test", question: "Q_Test", render: () => testView(), ready: () => answered },
    { key: "S_Save", question: "Q_Save", render: () => saveView(), ready: () => false },
  ];

  const body = el("div", { className: "m01w__body" });
  const preview = el("aside", { className: "m01w__preview" });
  const head = el("p", { className: "m01w__step" });
  const back = createButton({ label: tw("Back"), variant: "ghost", onClick: () => go(at - 1) });
  const next = createButton({ label: tw("Next"), onClick: () => go(at + 1) });
  const close = (): void => backdrop.remove();
  const dialog = el("div", {
    className: "m01w",
    attrs: { role: "dialog", "aria-label": tw("Title") },
    children: [
      el("div", {
        className: "m01w__top",
        children: [
          el("h2", { text: tw("Title") }),
          createButton({ label: tw("Close"), variant: "ghost", onClick: close }),
        ],
      }),
      head,
      el("div", { className: "m01w__main", children: [body, preview] }),
      el("div", { className: "m01w__nav", children: [back, next] }),
    ],
  });
  const backdrop = el("div", { className: "m01w__backdrop", children: [dialog] });
  backdrop.addEventListener("keydown", (ev) => ev.key === "Escape" && close());

  const changed = (): void => {
    drawPreview();
    next.disabled = !steps[at].ready(d);
  };

  const go = (to: number): void => {
    at = Math.max(0, Math.min(steps.length - 1, to));
    if (at === STEPS.length) answered = false; // 시험 계산 걸음에 들어올 때마다 새로
    const step = steps[at];
    head.textContent = tw("Step", { n: at + 1, total: steps.length, name: tw(step.key) });
    body.replaceChildren(step.render({ d, changed }));
    back.disabled = at === 0;
    next.hidden = at === steps.length - 1;
    changed();
  };

  /* ── 시험 계산 ── */
  const testView = (): HTMLElement => {
    const out = el("div", { className: "m01w__stack" });
    const inputs = collectInputs(d);
    const fields = inputs.map((s) => {
      testValues[s.name] ??= s.choices ? String(s.choices[0]) : "";
      const meta = d.meta[s.name];
      const control = s.choices
        ? select(
            s.choices.map((c) => ({ value: String(c), text: String(c) })),
            testValues[s.name],
            (v) => (testValues[s.name] = v),
            s.name,
          )
        : textBox(
            testValues[s.name],
            meta?.min && meta?.max ? `${meta.min} ∼ ${meta.max}` : tw("Qty_Number_Ph"),
            (v) => (testValues[s.name] = v),
            meta?.unit ? `${s.name} (${meta.unit})` : s.name,
          );
      control.dataset.input = s.name;
      return control;
    });
    const run = createButton({
      label: tw("Test_Run"),
      onClick: () => {
        void calc()
          .then((answer) => {
            answered = answer.ok;
            out.replaceChildren(resultView(answer));
            changed();
          })
          .catch(fail);
      },
    });
    out.append(el("p", { className: "m01w__muted", text: tw("Test_Empty") }));
    return el("div", {
      className: "m01w__page",
      children: [el("h3", { text: tw("Q_Test") }), ...fields, run, out],
    });
  };

  const calc = async (): Promise<CalcAnswer> => {
    if (!files.length) files = await fetchLogicFiles();
    const file = (files.find((f) => f.book === d.book) ?? files[0]).file;
    const given: Record<string, unknown> = {};
    for (const s of collectInputs(d)) {
      const raw = (testValues[s.name] ?? "").trim();
      if (raw === "") continue;
      const option = s.choices?.find((c) => String(c) === raw);
      given[s.name] = option ?? (Number.isNaN(Number(raw)) ? raw : Number(raw));
    }
    return runCalc({ key: "", inputs: given, row: buildRow(d), file });
  };

  /* ── 저장 ── */
  const saveView = (): HTMLElement => {
    const own = files.filter((f) => f.file.includes("자체"));
    const message = el("p", { className: "m01w__muted", text: tw("Save_Owner") });
    const errors = el("div", { className: "m01w__reasons", attrs: { hidden: "" } });
    let file = own[0]?.file ?? "";
    const save = createButton({
      label: tw("Save_Do"),
      disabled: !own.length,
      onClick: () => void doSave(file, errors),
    });
    return el("div", {
      className: "m01w__page",
      children: [
        el("h3", { text: tw("Q_Save") }),
        message,
        own.length
          ? select(
              own.map((f) => ({ value: f.file, text: f.file })),
              file,
              (v) => (file = v),
              tw("Save_File"),
            )
          : el("p", { className: "m01w__bad", text: tw("Save_None") }),
        errors,
        save,
      ],
    });
  };

  const doSave = async (file: string, errors: HTMLElement): Promise<void> => {
    const target = files.find((f) => f.file === file);
    if (!target) return;
    errors.hidden = true;
    try {
      const row = buildRow(d);
      await saveFiles([
        { file: target.file, version: target.version, changes: [{ op: "add", row }] },
      ]);
      showToast(tw("Save_Done"), "success");
      const found = await searchLogics(row.이름);
      const mine = found.logics.filter((l) => l.이름 === row.이름).map((l) => l.키);
      close();
      if (mine.length) options.onSaved?.(mine[mine.length - 1]);
    } catch (e) {
      if (e instanceof ApiError && typeof e.detail === "object" && e.detail !== null) {
        const list = (e.detail as { errors?: string[]; stale?: string[] }).errors ?? [];
        errors.replaceChildren(...list.map((t) => el("div", { text: t })));
        errors.hidden = false;
      } else fail(e);
    }
  };

  /* ── 옆 미리보기 ── */
  const drawPreview = (): void => {
    const rows: HTMLElement[] = [
      el("h4", { text: tw("Preview") }),
      el("p", {
        className: "m01w__muted",
        text: [d.name || "…", d.unit, d.section ? `${d.book} ${d.section}` : ""]
          .filter(Boolean)
          .join(" · "),
      }),
    ];
    for (const m of d.middles) {
      rows.push(
        el("div", {
          className: "m01w__line",
          text: `${tw("Preview_Middle")} ${m.name} = ${middleText(m)}`,
        }),
      );
    }
    if (isMoney(d.unit)) {
      for (const l of d.lines) {
        rows.push(
          el("div", {
            className: "m01w__line",
            attrs: { "data-line": l.name },
            children: [
              el("strong", { text: `${l.kind} · ${l.name}` }),
              el("span", { className: "m01w__muted", text: `${l.unit} · ${qtyPlain(l.qty)}` }),
            ],
          }),
        );
      }
    } else if (d.result.atom)
      rows.push(el("div", { className: "m01w__line", text: atomPlain(d.result.atom) }));
    const inputs = collectInputs(d).map((s) => s.name);
    if (inputs.length) {
      rows.push(
        el("p", {
          className: "m01w__muted",
          text: `${tw("Preview_Inputs")}: ${inputs.join(" · ")}`,
        }),
      );
    }
    for (const e of d.extras.filter((x) => x.name)) {
      rows.push(
        el("div", {
          className: "m01w__line",
          text: `${tw("Preview_Extra")} ${e.name} · ${e.base} × ${e.pct}%`,
        }),
      );
    }
    preview.replaceChildren(...rows);
  };

  document.body.append(backdrop);
  void fetchLogicFiles()
    .then((f) => (files = f))
    .catch(fail);
  go(0);
}

function resultView(answer: CalcAnswer): HTMLElement {
  if (!answer.ok) {
    return el("div", {
      className: "m01w__reasons",
      children: [
        el("strong", { text: tw("Test_Stopped") }),
        el("div", { text: plainReason(answer.reason) }),
      ],
    });
  }
  const parts: HTMLElement[] = [];
  if (answer.lines) {
    parts.push(
      el("table", {
        className: "m01w__grid",
        children: [
          el("tbody", {
            children: answer.lines.map((l) =>
              el("tr", {
                children: [
                  el("td", { text: l.이름 }),
                  el("td", { text: `${formatNumber(l.수량)} ${l.단위}` }),
                  el("td", { className: "m01w__money", text: formatNumber(l.금액) }),
                ],
              }),
            ),
          }),
        ],
      }),
    );
  }
  const total = answer.sums?.["계"] ?? (answer.result as number | undefined);
  if (total !== undefined) {
    parts.push(
      el("p", {
        className: "m01w__total",
        attrs: { "data-total": String(total) },
        text: `${answer.sums ? tw("Sum_Total") : tw("Sum_Result")} ${formatNumber(total)}`,
      }),
    );
  }
  return el("div", { className: "m01w__stack", children: parts });
}