/* =============================================================================
 * ui_template_group_cards.ts
 * 묶음 카드 공용 양식(PLAN 171-2) — 여러 줄이 한 묶음인 엑셀 꼴 표(호표 블록)를 카드로.
 *
 *   머리 = 호표 · 명칭 · 규격 · 단위 · 합계 / 몸 = 줄(이름 · 규격 · 수량 · 단위 · 합계 · 비고) /
 *   합계 줄 = 노무 · 재료 · 경비 · 계 · 줄 금액 = 합계만(비목 셋 = 풍선)
 *   글자 14px 한 벌 · 줄 간격 좁게 · 숫자 오른쪽 · 가로 열 수 1~4(기억은 부르는 쪽)
 *   묶음 12 넘으면 요약 보기(머리 · 합계만 · 머리 누름 = 펼침 · 모두 펼침 · 접기)
 *   줄 번호(`at`) = 부르는 쪽 표 줄 번호 — 누름 = `onPick(at)` · 이동해 온 줄 = 펼침 + 스크롤 + 강조
 * ========================================================================== */

import "./ui_template_group_cards.css";
import { createButton } from "./ui_template_elements";

/** 비목 셋 — 노무 · 재료 · 경비 */
export type GroupParts = [number | null, number | null, number | null];

export interface GroupLine {
  at: number;
  name: string;
  /** 이름 앞 작은 꼬리표(예 산근 공종 「노무 · 중기」) */
  tag?: string;
  spec?: string;
  qty?: number | null;
  unit?: string;
  sum?: number | null;
  parts?: GroupParts | null;
  note?: string;
  /** 규격 · 비고 칸 풍선(원문번호 · 까닭) */
  specTip?: string | null;
  noteTip?: string | null;
  /** 누르면 이동하는 줄 */
  link?: boolean;
}

export interface GroupFoot {
  at: number;
  parts: GroupParts;
  sum: number | null;
  note?: string;
  tip?: string | null;
}

export interface GroupCard {
  key: string;
  at: number;
  no: string;
  name: string;
  spec?: string;
  specTip?: string | null;
  unit?: string;
  sum?: number | null;
  lines: GroupLine[];
  foot?: GroupFoot | null;
}

export interface GroupCardsOptions {
  groups: GroupCard[];
  /** 가로 열 수(1~4 · 모르는 값 = 2) */
  columns?: unknown;
  onColumns?: (columns: number) => void;
  onPick?: (at: number) => void;
  /** 이동해 온 줄(표 줄 번호) */
  focus?: number;
  money?: (value: number | null | undefined) => string;
  qty?: (value: number | null | undefined) => string;
  /** 머리 띠 끝 단추(예 [표로 보기]) */
  actions?: HTMLElement[];
}

export const GROUP_SUMMARY_OVER = 12;
export const GROUP_COLUMNS = [1, 2, 3, 4] as const;
export const PART_LABELS = ["노무", "재료", "경비"] as const;

/** 가로 열 수 — 1~4 · 모르는 값 = 2 */
export const clampColumns = (value: unknown): number =>
  GROUP_COLUMNS.includes(value as 1) ? (value as number) : 2;

/** 요약 보기 — 묶음 12 넘음 */
export const isSummary = (count: number): boolean => count > GROUP_SUMMARY_OVER;

const won = new Intl.NumberFormat("ko-KR", { maximumFractionDigits: 1 });
const plain = (value: number | null | undefined): string =>
  value === null || value === undefined || !Number.isFinite(value) ? "" : won.format(value);

/** 줄 비목 풍선 — 「노무 1,234 · 재료 0 · 경비 56」 · 셋 다 빈칸 = 없음 */
export function partsTip(
  parts: GroupParts | null | undefined,
  money: (value: number | null | undefined) => string = plain,
): string | null {
  if (!parts || parts.every((v) => v === null || v === undefined)) return null;
  return parts.map((v, i) => `${PART_LABELS[i]} ${money(v) || "-"}`).join(" · ");
}

function span(className: string, value: string, tip?: string | null): HTMLSpanElement {
  const s = document.createElement("span");
  s.className = className;
  s.textContent = value;
  if (tip) s.title = tip;
  return s;
}

function cell(tag: "td" | "th", className: string, value: string, tip?: string | null) {
  const c = document.createElement(tag);
  c.className = className;
  c.textContent = value;
  if (tip) c.title = tip;
  return c;
}

const COLS = ["이름", "규격", "수량", "단위", "합계", "비고"];
const NUM_COL = new Set([2, 4]);

function linesTable(g: GroupCard, o: Required<Pick<GroupCardsOptions, "money" | "qty">>) {
  const table = document.createElement("table");
  table.className = "ui-group-card__lines";
  const head = document.createElement("tr");
  head.append(...COLS.map((c, i) => cell("th", NUM_COL.has(i) ? "is-num" : "", c)));
  const thead = document.createElement("thead");
  thead.append(head);
  const tbody = document.createElement("tbody");
  for (const ln of g.lines) {
    const tr = document.createElement("tr");
    tr.dataset.at = String(ln.at);
    if (ln.link) tr.classList.add("is-link");
    const name = cell("td", "ui-group-card__name", ln.name);
    if (ln.tag) name.prepend(span("ui-group-card__tag", ln.tag));
    tr.append(
      name,
      cell("td", "", ln.spec ?? "", ln.specTip),
      cell("td", "is-num", o.qty(ln.qty)),
      cell("td", "", ln.unit ?? ""),
      cell("td", "is-num", o.money(ln.sum), partsTip(ln.parts, o.money)),
      cell("td", "ui-group-card__note", ln.note ?? "", ln.noteTip),
    );
    tbody.append(tr);
  }
  table.append(thead, tbody);
  return table;
}

function footRow(f: GroupFoot, money: (v: number | null | undefined) => string): HTMLElement {
  const foot = document.createElement("div");
  foot.className = "ui-group-card__foot";
  foot.dataset.at = String(f.at);
  f.parts.forEach((v, i) =>
    foot.append(span("ui-group-card__part", `${PART_LABELS[i]} ${money(v)}`)),
  );
  foot.append(span("ui-group-card__sum", `계 ${money(f.sum)}`, f.tip));
  if (f.note) foot.append(span("ui-group-card__foot-note", f.note, f.tip));
  return foot;
}

function card(g: GroupCard, o: Required<Pick<GroupCardsOptions, "money" | "qty">>): HTMLElement {
  const box = document.createElement("article");
  box.className = "ui-group-card";
  box.dataset.key = g.key;
  const head = document.createElement("div");
  head.className = "ui-group-card__head";
  head.dataset.at = String(g.at);
  head.append(
    span("ui-group-card__no", g.no),
    span("ui-group-card__title", g.name),
    span("ui-group-card__spec", g.spec ?? "", g.specTip),
    span("ui-group-card__unit", g.unit ?? ""),
    span("ui-group-card__total", o.money(g.sum ?? g.foot?.sum)),
  );
  const body = document.createElement("div");
  body.className = "ui-group-card__body";
  if (g.lines.length) body.append(linesTable(g, o));
  box.append(head, body);
  if (g.foot) box.append(footRow(g.foot, o.money));
  return box;
}

/** 묶음 카드 판 — 머리 띠(가로 열 수 · 요약 단추 · 부르는 쪽 단추) + 카드 격자 */
export function createGroupCards(opts: GroupCardsOptions): HTMLElement {
  const fmt = { money: opts.money ?? plain, qty: opts.qty ?? plain };
  const root = document.createElement("div");
  root.className = "ui-group-cards";
  const grid = document.createElement("div");
  grid.className = "ui-group-cards__grid";
  let columns = clampColumns(opts.columns);
  grid.style.setProperty("--group-cols", String(columns));
  const cards = opts.groups.map((g) => card(g, fmt));
  grid.append(...cards);
  const summary = isSummary(opts.groups.length);
  const setOpen = (box: Element, open: boolean) => box.classList.toggle("is-closed", !open);
  if (summary) cards.forEach((c) => setOpen(c, false));

  const bar = document.createElement("div");
  bar.className = "ui-group-cards__bar";
  const pick = document.createElement("div");
  pick.className = "ui-btn-group ui-group-cards__cols";
  pick.append(span("ui-group-cards__label", "가로"));
  const colButtons = GROUP_COLUMNS.map((n) => {
    const b = createButton({
      label: String(n),
      variant: n === columns ? "filled" : "ghost",
      size: "sm",
      onClick: () => {
        columns = n;
        grid.style.setProperty("--group-cols", String(n));
        colButtons.forEach((x, i) => {
          x.classList.toggle("ui-btn--filled", GROUP_COLUMNS[i] === n);
          x.classList.toggle("ui-btn--ghost", GROUP_COLUMNS[i] !== n);
          x.setAttribute("aria-pressed", String(GROUP_COLUMNS[i] === n));
        });
        opts.onColumns?.(n);
      },
    });
    b.setAttribute("aria-pressed", String(n === columns));
    b.dataset.groupCols = String(n);
    return b;
  });
  pick.append(...colButtons);
  bar.append(pick, span("ui-group-cards__count", `묶음 ${opts.groups.length}`));
  if (summary) {
    const all = (open: boolean) => () => cards.forEach((c) => setOpen(c, open));
    bar.append(
      span("ui-group-cards__count", "요약 보기 — 머리를 누르면 펼침"),
      createButton({ label: "모두 펼침", variant: "ghost", size: "sm", onClick: all(true) }),
      createButton({ label: "모두 접기", variant: "ghost", size: "sm", onClick: all(false) }),
    );
  }
  const tail = document.createElement("div");
  tail.className = "ui-group-cards__actions";
  tail.append(...(opts.actions ?? []));
  bar.append(tail);
  root.append(bar, grid);

  grid.addEventListener("click", (event) => {
    const el = (event.target as Element).closest<HTMLElement>("[data-at]");
    if (!el || !grid.contains(el)) return;
    const box = el.closest(".ui-group-card");
    if (summary && box && el.classList.contains("ui-group-card__head"))
      return setOpen(box, box.classList.contains("is-closed"));
    opts.onPick?.(Number(el.dataset.at));
  });

  if (opts.focus !== undefined && opts.focus >= 0) {
    const el = grid.querySelector<HTMLElement>(`[data-at="${opts.focus}"]`);
    const box = el?.closest(".ui-group-card");
    if (box) setOpen(box, true);
    el?.classList.add("is-focus");
    requestAnimationFrame(() => el?.scrollIntoView({ block: "center" }));
  }
  return root;
}