/* =============================================================================
 * B05_Profile_UI_Structures_Summary_Picker.ts
 * ⚠ **임시(가짜) 항목 고르기 모달** — 21-5(sub1) `ui_template/ui_template_item_picker.ts` 의
 * `openItemPicker()` 가 오면 이 파일을 지우고 `Summary_Row` 를 쓰는 패널의 import 한 줄만 바꾼다.
 *
 * 이름 · 돌려주는 값은 21-5 와 맞춘 자리다:
 *   openItemPicker({ current }) → Promise<{ item } | { clear: true } | null>
 *   (item = 21-1 `summary_item` · clear = [해제] · null = 닫음)
 * 목록은 `GET /api/m02/items?all=1`(21-2) 을 읽고, 아직 없으면(404 등) 같은 21-1 모양의 가짜 세 줄.
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";
import { createButton, el } from "@ui/ui_template_elements";
import { openModal } from "@ui/ui_template_modal";
import {
  sameSummaryItem,
  summaryLabel,
  type SummaryItem,
  type SummaryLayer,
} from "../common_util/common_util_summary_item";

export type ItemPickResult = { item: SummaryItem } | { clear: true } | null;

interface ItemRow {
  key: string;
  이름?: string;
  종류?: string;
  분류1?: string;
  layer?: SummaryLayer;
  owner?: string | null;
}

/** 21-2 서버가 없을 때의 가짜 응답 — 21-1 모양. */
const FAKE_ITEMS: SummaryItem[] = [
  { layer: "system", owner: null, key: "SS000001", name: "돌기슭막이 메쌓기(가짜)" },
  { layer: "company", owner: "가짜회사", key: "SS000002", name: "옹벽 콘크리트(가짜)" },
  { layer: "personal", owner: "가짜회사/가짜사용자", key: "SS000003", name: "돌쌓기 찰쌓기(가짜)" },
];

async function loadItems(): Promise<SummaryItem[]> {
  try {
    const response = await fetch(`${API_BASE_URL}/m02/items?all=1`, { credentials: "include" });
    if (!response.ok) return FAKE_ITEMS;
    const rows = (await response.json()) as ItemRow[];
    if (!Array.isArray(rows) || !rows.length) return FAKE_ITEMS;
    return rows.map((row) => ({
      layer: row.layer ?? "system",
      owner: row.owner ?? null,
      key: row.key,
      name: row.분류1 ? `${row.종류 ?? ""} · ${row.분류1} · ${row.key}` : (row.종류 ?? row.key),
    }));
  } catch {
    return FAKE_ITEMS;
  }
}

export function openItemPicker(options: { current: SummaryItem | null }): Promise<ItemPickResult> {
  return new Promise((resolve) => {
    let settled = false;
    const finish = (result: ItemPickResult, close?: () => void): void => {
      if (settled) return;
      settled = true;
      close?.();
      resolve(result);
    };
    const modal = openModal({
      title: "집계 항목 고르기(임시)",
      closeLabel: "닫기",
      mount: (body, close) => {
        const list = el("div", { className: "b05-structure__pick-list" });
        const apply = createButton({ label: "적용", variant: "filled" });
        apply.disabled = true;
        let chosen: SummaryItem | null = null;
        void loadItems().then((items) => {
          items.forEach((item) => {
            const row = createButton({ label: summaryLabel(item), variant: "ghost" });
            row.dataset.b05PickItem = item.key;
            // 지금 지정된 항목은 미리 표시(눌러서 바로 [적용] 가능)
            if (sameSummaryItem(item, options.current)) {
              chosen = item;
              apply.disabled = false;
              row.classList.add("is-picked");
            }
            row.addEventListener("click", () => {
              chosen = item;
              apply.disabled = false;
              list
                .querySelectorAll(".is-picked")
                .forEach((node) => node.classList.remove("is-picked"));
              row.classList.add("is-picked");
            });
            list.append(row);
          });
        });
        apply.addEventListener("click", () => chosen && finish({ item: chosen }, close));
        const clear = createButton({ label: "해제", variant: "ghost" });
        clear.addEventListener("click", () => finish({ clear: true }, close));
        body.append(list, el("div", { children: [apply, clear] }));
      },
      beforeClose: () => {
        finish(null);
        return true;
      },
    });
    void modal;
  });
}