/* =============================================================================
 * M01_MasterData_UI_Cells.ts
 * 칸 다루기 — 값 → 글 · 글 → 값 · 눌러 고치기 · 쪽 나눔 띠 (요소·표 화면 공용)
 * ========================================================================== */

import { createButton, el } from "@ui/ui_template_elements";
import { t as L } from "@ui/ui_template_locale";
import type { Row } from "./M01_MasterData_Api_Fetch";

/** 묶음 값(`값 = {가격: …}`)을 「값›가격」 칸으로 펼칠 때의 구분자. */
export const SEP = "›";

export const isScalar = (v: unknown): boolean =>
  v === null || v === undefined || ["string", "number", "boolean"].includes(typeof v);

/** 줄 → 칸 이름별 값. 묶음(dict) 칸은 한 단계 펼침. */
export function flatten(row: Row): Record<string, unknown> {
  const out: Record<string, unknown> = {};
  for (const [k, v] of Object.entries(row)) {
    if (v && typeof v === "object" && !Array.isArray(v)) {
      for (const [k2, v2] of Object.entries(v)) out[`${k}${SEP}${k2}`] = v2;
    } else {
      out[k] = v;
    }
  }
  return out;
}

/** 칸 이름(펼친 것 포함)에 값을 넣은 새 줄. */
export function withCell(row: Row, path: string, value: unknown): Row {
  const [head, sub] = path.split(SEP);
  if (sub === undefined) return { ...row, [head]: value };
  return { ...row, [head]: { ...(row[head] as Row), [sub]: value } };
}

export function show(v: unknown): string {
  if (v === null || v === undefined) return "";
  if (Array.isArray(v)) return v.map((x) => (x === null ? "" : String(x))).join(" ~ ");
  return typeof v === "object" ? JSON.stringify(v) : String(v);
}

const NUMBER = /^-?\d+(\.\d+)?$/;

/** 글 → 수(수 꼴이면) 아니면 글. 빈 글 = null. */
export function toNumberish(text: string): number | string | null {
  const s = text.replace(/,/g, "").trim();
  if (s === "") return null;
  return NUMBER.test(s) ? Number(s) : text.trim();
}

/** 원래 값의 꼴을 따라 글을 값으로 — 글이었으면 글 · 수·빈 칸이었으면 수 꼴이면 수. */
export const coerce = (text: string, orig: unknown): unknown =>
  typeof orig === "string" ? text : toNumberish(text);

/** 「아래 ~ 위」 → [아래, 위] (빈 쪽 = null · 「~」 없으면 한 값). */
export function toRange(text: string): unknown {
  if (!text.includes("~")) return toNumberish(text);
  return text.split("~").map((s) => (s.trim() === "" ? null : toNumberish(s)));
}

/** 칸을 눌러 고침 — Enter·칸 밖 누름 = 확정 · Esc = 취소. */
export function startEdit(td: HTMLElement, text: string, commit: (value: string) => void): void {
  if (td.querySelector("input")) return;
  const input = el("input", { className: "m01-master__cell-input", attrs: { type: "text" } });
  input.value = text;
  td.textContent = "";
  td.append(input);
  input.focus();
  input.select();
  let done = false;
  const finish = (ok: boolean): void => {
    if (done) return;
    done = true;
    if (ok && input.value !== text) commit(input.value);
    else td.textContent = text;
  };
  input.addEventListener("keydown", (e) => {
    if (e.key === "Enter") finish(true);
    else if (e.key === "Escape") finish(false);
  });
  input.addEventListener("blur", () => finish(true));
}

/** 쪽 나눔 띠 — 이전·다음 · 「n / N 쪽 · 전체 줄」. */
export function buildPager(
  total: number,
  size: number,
  page: number,
  goto: (page: number) => void,
): HTMLElement {
  const last = Math.max(1, Math.ceil(total / size));
  const prev = createButton({ label: L("M01_Prev"), variant: "ghost", disabled: page <= 1 });
  const next = createButton({ label: L("M01_Next"), variant: "ghost", disabled: page >= last });
  prev.addEventListener("click", () => goto(page - 1));
  next.addEventListener("click", () => goto(page + 1));
  return el("div", {
    className: "m01-master__pager",
    children: [
      el("span", {
        text: `${page} / ${last} ${L("M01_Page")} · ${total.toLocaleString("ko-KR")} ${L("M01_Rows")}`,
      }),
      prev,
      next,
    ],
  });
}

/** 칸 하나 — 노랑(고침) · 눌러 고침. */
export function buildCell(
  text: string,
  opts: { changed: boolean; onEdit?: (value: string) => void },
): HTMLTableCellElement {
  const td = el("td", { text, attrs: { title: text } });
  td.classList.toggle("is-changed", opts.changed);
  if (opts.onEdit) {
    const onEdit = opts.onEdit;
    td.classList.add("is-editable");
    td.addEventListener("click", () => startEdit(td, text, onEdit));
  }
  return td;
}