/* =============================================================================
 * M02_SO_Def_Ui.ts
 * 구조물 정의 편집 화면(PLAN 48-2)의 작은 입력 부품 — 글 · 숫자 · 체크 · 고르기 · 위아래 단추.
 * 값은 받은 손잡이로 사본만 고침 · 글은 칸을 떠날 때(`change`) 다시 그림(초점 안 끊김).
 * ========================================================================== */

import { createButton, el } from "@ui/ui_template_elements";
import { step } from "./M02_SO_Def_Model";
import { to } from "./M02_SO_Text";

/** 글 칸 — 글자마다 `set` · 떠날 때 `done` */
export function textBox(
  value: string,
  set: (v: string) => void,
  done: () => void,
  opt: { edit: boolean; attr?: string; place?: string; cls?: string; max?: number },
): HTMLInputElement {
  const box = el("input", {
    className: `ui-input ui-input--sm ${opt.cls ?? ""}`,
    attrs: {
      type: "text",
      maxlength: String(opt.max ?? 40),
      ...(opt.attr ? { [opt.attr]: "" } : {}),
    },
  }) as HTMLInputElement;
  box.value = value;
  box.placeholder = opt.place ?? "";
  box.disabled = !opt.edit;
  box.addEventListener("input", () => {
    set(box.value);
    box.classList.toggle("is-invalid", !box.value.trim() && !opt.place);
  });
  box.addEventListener("change", done);
  return box;
}

/** 숫자 칸 — 범위 밖 · 빈 칸은 무름 */
export function numberBox(
  value: number,
  set: (v: number) => void,
  opt: { edit: boolean; min: number; max: number; attr?: string },
): HTMLInputElement {
  const box = el("input", {
    className: "ui-input ui-input--sm m02-sod__num",
    attrs: {
      type: "number",
      min: String(opt.min),
      max: String(opt.max),
      ...(opt.attr ? { [opt.attr]: "" } : {}),
    },
  }) as HTMLInputElement;
  box.value = String(value);
  box.disabled = !opt.edit;
  box.addEventListener("change", () => {
    const n = Math.round(Number(box.value));
    if (box.value === "" || !Number.isFinite(n) || n < opt.min || n > opt.max) {
      box.value = String(value);
      return;
    }
    set(n);
  });
  return box;
}

/** 체크 + 글 */
export function checkBox(
  label: string,
  on: boolean,
  set: (v: boolean) => void,
  opt: { edit: boolean; attr?: string },
): HTMLLabelElement {
  const box = el("input", {
    attrs: { type: "checkbox", ...(opt.attr ? { [opt.attr]: "" } : {}) },
  }) as HTMLInputElement;
  box.checked = on;
  box.disabled = !opt.edit;
  box.addEventListener("change", () => set(box.checked));
  return el("label", { className: "m02-sod__check", children: [box, el("span", { text: label })] });
}

/** 고르기 — [값, 글] 짝 */
export function pickBox(
  pairs: readonly (readonly [string, string])[],
  value: string,
  set: (v: string) => void,
  opt: { edit: boolean; attr?: string; cls?: string },
): HTMLSelectElement {
  const box = el("select", {
    className: `ui-input ui-input--sm ${opt.cls ?? ""}`,
    attrs: opt.attr ? { [opt.attr]: "" } : {},
  }) as HTMLSelectElement;
  box.append(...pairs.map(([v, t]) => new Option(t, v)));
  box.value = value;
  box.disabled = !opt.edit;
  box.addEventListener("change", () => set(box.value));
  return box;
}

/** 위로 · 아래로 단추 둘 — 고치는 사람만 · 옮겼으면 `changed` */
export function moveButtons<T>(
  list: T[],
  item: T,
  changed: () => void,
  edit: boolean,
): HTMLElement[] {
  if (!edit) return [];
  const index = list.indexOf(item);
  const make = (label: string, delta: number, off: boolean): HTMLButtonElement => {
    const b = createButton({ label, variant: "ghost", size: "sm" });
    b.disabled = off;
    b.addEventListener("click", () => step(list, list.indexOf(item), delta) && changed());
    return b;
  };
  return [make(to("GroupUp"), -1, index <= 0), make(to("GroupDown"), 1, index >= list.length - 1)];
}

/** 절 제목 + 안내 한 줄 */
export const head = (title: string, note?: string): HTMLElement[] => [
  el("h4", { className: "m02-opts__group", text: title }),
  ...(note ? [el("p", { className: "m02-side__empty", text: note })] : []),
];