/* =============================================================================
 * ui_template_modal.ts
 * 공용 모달 겉틀 — 배경 · 제목줄 · 닫기 · Esc · 포커스. 몸은 `mount` 가 채움.
 * M01 · M02 가 함께 씀 — `dialogClass` · `backdropClass` 로 화면별 겉모양을 덧붙임.
 * ========================================================================== */

import "./ui_template_modal.css";
import { createButton, el } from "./ui_template_elements";

export interface ModalOptions {
  title: string;
  closeLabel: string;
  mount: (body: HTMLElement, close: () => void) => void;
  dialogClass?: string;
  backdropClass?: string;
}

export function openModal(opts: ModalOptions): { close: () => void } {
  const body = el("div", { className: "ui-modal__body" });
  const close = (): void => backdrop.remove();
  const dialog = el("div", {
    className: `ui-modal ${opts.dialogClass ?? ""}`.trim(),
    attrs: { role: "dialog", "aria-label": opts.title },
    children: [
      el("div", {
        className: "ui-modal__top",
        children: [
          el("h3", { text: opts.title }),
          createButton({ label: opts.closeLabel, variant: "ghost", onClick: close }),
        ],
      }),
      body,
    ],
  });
  const backdrop = el("div", {
    className: `ui-modal__backdrop ${opts.backdropClass ?? ""}`.trim(),
    children: [dialog],
  });
  backdrop.addEventListener("click", (ev) => ev.target === backdrop && close());
  backdrop.addEventListener("keydown", (ev) => ev.key === "Escape" && close());
  opts.mount(body, close);
  document.body.append(backdrop);
  dialog.tabIndex = -1;
  dialog.focus();
  return { close };
}