/* =============================================================================
 * M02_MasterTemplete_Practice.ts
 * 좌측 「실무문서」 컨테이너(구조물 조합 밖 · 도면 양식 아래 · 마스터 층 · 시스템 관리자만 · PLAN 39-2) —
 * 줄 하나를 누르면 메인 칸에 옛 마스터 일위대가 조합(`일위대가조합.json` 통째) 목록 · 상세(읽기만) ·
 * [통째 지우기](물음 두 번 → `DELETE /api/m02/practice` · 서버도 시스템 관리자 · 쓰는 곳 0 확인).
 * 읽기 = 마스터 조합 길(`Labor_Api`) · 복사 원본 고르기는 목록 화면(ItemList)의 실무문서 탭 몫.
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";
import { createButton, el, showConfirmDialog, showToast } from "@ui/ui_template_elements";
import { loadingError, showLoading } from "@ui/ui_template_loading";
import { t as L } from "@ui/ui_template_locale";
import {
  fetchCombo,
  fetchComboList,
  type ComboList,
  type ComboOne,
} from "./M02_MasterTemplete_Labor_Api";

export interface PracticeSectionOptions {
  /** 저장 안 한 고침을 버릴지 확인 — 취소면 false */
  confirmLeave: () => Promise<boolean>;
  /** 메인 칸에 화면을 띄움 */
  show: (label: string, node: HTMLElement) => (dirty: boolean) => void;
  /** 화면을 열었음 — 좌측 다른 고름 표시를 지움 */
  onOpen: () => void;
}

export interface PracticeSection {
  title: string;
  body: HTMLElement;
  /** 다른 화면을 열었음 — 고름 표시만 지움 */
  clear: () => void;
}

const why = (error: unknown): string => (error instanceof Error ? error.message : String(error));

/** 서버 까닭 글 — `{errors}` · 판 다름 · 글 */
function reasonOf(detail: unknown, status: number): string {
  if (typeof detail === "string") return detail;
  const d = detail as { errors?: string[]; stale?: unknown } | null;
  if (d?.errors?.length) return d.errors.join(" · ");
  return d?.stale ? L("M02_PracticeStale") : `HTTP ${status}`;
}

/** 통째 지우기 — 줄을 모두 비움(판 = 읽은 표 판) */
async function dropPractice(판: string): Promise<void> {
  const res = await fetch(`${API_BASE_URL}/m02/practice?판=${encodeURIComponent(판)}`, {
    method: "DELETE",
    credentials: "include",
  });
  if (res.ok) return;
  const data = (await res.json().catch(() => ({}))) as { detail?: unknown };
  throw new Error(reasonOf(data.detail, res.status));
}

const table = (heads: string[], rows: HTMLElement[]): HTMLElement =>
  el("div", {
    className: "ui-general-block__table-wrap ui-general-block__table-wrap--sticky-head",
    children: [
      el("table", {
        className: "ui-general-block__table m02-practice__table",
        children: [
          el("thead", {
            children: [el("tr", { children: heads.map((t) => el("th", { text: t })) })],
          }),
          el("tbody", { children: rows }),
        ],
      }),
    ],
  });

const cells = (values: string[]): HTMLElement[] =>
  values.map((v) => el("td", { text: v, attrs: { title: v } }));

export function buildPracticeSection(opt: PracticeSectionOptions): PracticeSection {
  const row = el("button", {
    className: "m02-side__item ui-sidebar-row",
    text: L("M02_PracticeRow"),
    attrs: { type: "button", "data-practice-row": "" },
  });
  const body = el("div", { className: "m02-side__items ui-sidebar-list", children: [row] });
  const view = el("div", { className: "m02-practice" });
  let opened = false;
  let nav = 0; // 늦게 온 응답 버림
  const mark = (on: boolean): void => {
    opened = on;
    row.classList.toggle("is-active", on);
  };
  row.addEventListener("click", () => void open());

  async function open(): Promise<void> {
    if (opened || !(await opt.confirmLeave())) return;
    opt.show(L("M02_PracticeTitle"), view);
    opt.onOpen();
    mark(true);
    await drawList();
  }

  async function drawList(): Promise<void> {
    const my = ++nav;
    const stop = showLoading(view);
    let list: ComboList;
    try {
      list = await fetchComboList();
    } catch (error) {
      stop();
      if (my === nav) view.replaceChildren(loadingError(why(error), () => void drawList()));
      return;
    } finally {
      stop();
    }
    if (my !== nav) return;
    const drop = createButton({ label: L("M02_PracticeDrop"), variant: "danger", size: "sm" });
    drop.disabled = !list.줄.length;
    drop.addEventListener("click", () => void dropAll(list, drop));
    const rows = list.줄.map((c) => {
      const tr = el("tr", {
        className: "m02-practice__row",
        attrs: { "data-practice-key": c.키 },
        children: cells([c.키, c.이름, c.구분 ?? "", c.단위 ?? "", String(c.count)]),
      });
      tr.addEventListener("click", () => void drawOne(c.키));
      return tr;
    });
    view.replaceChildren(
      el("div", {
        className: "m02-practice__bar",
        children: [
          el("span", {
            className: "m02-practice__note",
            text: L("M02_PracticeCount").replace("{n}", String(list.줄.length)),
          }),
          drop,
        ],
      }),
      rows.length
        ? table(
            [
              L("M02_PracticeKey"),
              L("M02_Name"),
              L("M02_PracticeGroup"),
              L("M02_PracticeUnit"),
              L("M02_PracticeLogics"),
            ],
            rows,
          )
        : el("p", { className: "m02-practice__note", text: L("M02_PracticeEmpty") }),
    );
  }

  /** 상세 — 읽기만(이름 · 키 · 구분 · 단위 · 비고 + 담은 로직 표) */
  async function drawOne(key: string): Promise<void> {
    const my = ++nav;
    const stop = showLoading(view);
    let one: ComboOne;
    try {
      one = await fetchCombo(key);
    } catch (error) {
      stop();
      if (my === nav) view.replaceChildren(loadingError(why(error), () => void drawOne(key)));
      return;
    } finally {
      stop();
    }
    if (my !== nav) return;
    const back = createButton({ label: L("M02_PracticeBack"), variant: "ghost", size: "sm" });
    back.addEventListener("click", () => void drawList());
    const c = one.combo;
    const info = [
      [L("M02_PracticeKey"), c.키],
      [L("M02_PracticeGroup"), c.구분 ?? ""],
      [L("M02_PracticeUnit"), c.단위 ?? ""],
    ].map(([k, v]) => el("span", { className: "m02-practice__note", text: `${k} ${v}` }));
    const lines = one.줄.map((x) =>
      el("tr", {
        children: cells([
          String(x.차례),
          x.로직,
          x.ok ? (x.이름 ?? "") : (x.까닭 ?? ""),
          x.결과단위 ?? "",
          x.메모 ?? "",
        ]),
      }),
    );
    view.replaceChildren(
      el("div", {
        className: "m02-practice__bar",
        children: [back, el("strong", { text: c.이름 }), ...info],
      }),
      ...(c.비고 ? [el("p", { className: "m02-practice__memo", text: c.비고 })] : []),
      lines.length
        ? table(
            [
              L("M02_PracticeOrder"),
              L("M02_PracticeKey"),
              L("M02_Name"),
              L("M02_PracticeUnit"),
              L("M02_PracticeMemo"),
            ],
            lines,
          )
        : el("p", { className: "m02-practice__note", text: L("M02_PracticeNoLogic") }),
    );
  }

  /** 통째 지우기 — 물음 두 번 · 서버가 쓰는 곳 · 판을 다시 봄 */
  async function dropAll(list: ComboList, button: HTMLButtonElement): Promise<void> {
    const n = String(list.줄.length);
    if (!(await showConfirmDialog(L("M02_PracticeDropAsk").replace("{n}", n), L("M02_Delete"))))
      return;
    if (!(await showConfirmDialog(L("M02_PracticeDropAsk2"), L("M02_PracticeDrop")))) return;
    button.disabled = true;
    try {
      await dropPractice(list.판);
      showToast(L("M02_PracticeDropped").replace("{n}", n), "success");
    } catch (error) {
      showToast(L("M02_ActionFailed").replace("{value}", why(error)), "error");
    }
    await drawList();
  }

  return { title: L("M02_PracticeTitle"), body, clear: () => mark(false) };
}