/* =============================================================================
 * spreadsheet_find_panel.ts  (주인 D)
 * 찾기(Ctrl+F) · 바꾸기(Ctrl+H) 작은 패널 — 부품 오른위에 뜸. 찾기 규칙은 `spreadsheet_find.ts`(sub1).
 * Enter = 다음 · Esc = 닫고 격자로. 바꾸기 = 활성 칸이 맞으면 바꾸고 다음으로(엑셀).
 * ========================================================================== */

import { el } from "@ui/ui_template_elements";
import { findAll, findNext, replaceAll, replaceOne, type FindOptions } from "./spreadsheet_find";
import { selectCell } from "./spreadsheet_selection";
import type { PartHandle, SpreadsheetContext } from "./spreadsheet_view_types";

const TEXT = {
  find: "찾을 내용",
  replace: "바꿀 내용",
  next: "다음",
  one: "바꾸기",
  all: "모두 바꾸기",
  close: "닫기",
  case: "대소문자",
  whole: "전체 칸",
  formula: "수식 안",
  none: "찾을 수 없음",
  replaced: "{n} 개 바꿈",
};

export interface FindPanelHandle extends PartHandle {
  open(replace: boolean): void;
  close(): void;
}

export function mountFindPanel(ctx: SpreadsheetContext, back: () => void): FindPanelHandle {
  const query = el("input", { className: "ss-find__input", attrs: { placeholder: TEXT.find } });
  const repl = el("input", { className: "ss-find__input", attrs: { placeholder: TEXT.replace } });
  const status = el("span", { className: "ss-find__status" });
  const button = (text: string, onClick: () => void): HTMLButtonElement => {
    const b = el("button", { className: "ss-find__btn", text, attrs: { type: "button" } });
    b.addEventListener("click", onClick);
    return b;
  };
  const check = (text: string): HTMLInputElement => {
    const box = el("input", { attrs: { type: "checkbox" } });
    options.append(el("label", { className: "ss-find__opt", children: [box, text] }));
    return box;
  };
  const closeBtn = button("×", close);
  closeBtn.title = TEXT.close;
  const options = el("div", { className: "ss-find__row" });
  const caseBox = check(TEXT.case);
  const wholeBox = check(TEXT.whole);
  const formulaBox = check(TEXT.formula);
  const replaceRow = el("div", {
    className: "ss-find__row",
    children: [repl, button(TEXT.one, one), button(TEXT.all, all)],
  });
  const root = el("div", {
    className: "ss-find",
    attrs: { hidden: "" },
    children: [
      el("div", {
        className: "ss-find__row",
        children: [query, button(TEXT.next, next), closeBtn],
      }),
      replaceRow,
      options,
      status,
    ],
  });
  ctx.root.append(root);

  const opts = (): FindOptions => ({
    대소문자: caseBox.checked,
    전체칸: wholeBox.checked,
    수식안: formulaBox.checked,
  });
  const here = () => ({ 시트: ctx.selection.시트, ...ctx.selection.활성 });

  function next(): void {
    status.textContent = "";
    if (!query.value) return;
    const hit = findNext(ctx.book, here(), query.value, opts());
    if (!hit) return void (status.textContent = TEXT.none);
    if (hit.시트 !== ctx.selection.시트) ctx.showSheet(hit.시트);
    ctx.select(selectCell(ctx.sheet(), hit.r, hit.c), true);
  }

  function one(): void {
    if (ctx.readOnly || !query.value) return;
    const at = here();
    const onIt = findAll(ctx.book, query.value, opts(), [at.시트]).some(
      (h) => h.r === at.r && h.c === at.c,
    );
    if (onIt) replaceOne(ctx, at, query.value, repl.value, opts());
    next();
  }

  function all(): void {
    if (ctx.readOnly || !query.value) return;
    const n = replaceAll(ctx, query.value, repl.value, opts());
    status.textContent = n ? TEXT.replaced.replace("{n}", String(n)) : TEXT.none;
  }

  function open(replace: boolean): void {
    replaceRow.hidden = !replace || ctx.readOnly;
    root.removeAttribute("hidden");
    status.textContent = "";
    query.focus();
    query.select();
  }

  function close(): void {
    root.setAttribute("hidden", "");
    back();
  }

  const onKey = (e: KeyboardEvent): void => {
    if (e.key === "Escape") close();
    else if (e.key === "Enter") e.target === repl ? one() : next();
    else return;
    e.preventDefault();
    e.stopPropagation();
  };
  root.addEventListener("keydown", onKey);

  return {
    root,
    open,
    close,
    refresh() {},
    destroy: () => root.remove(),
  };
}