/* =============================================================================
 * B08_Quantity_UI_Summary.ts
 * 1탭 구조물 집계표(PLAN 61-1) — 줄 = 측점 · 열 = 저장된 구조물 조합 · 칸은 아직 비움.
 * 표는 공용 많은 자료 표(`ui_template_data_table` · PLAN 70-2) — 머리 · 측점 열 고정.
 *
 *   구조물 = GET …/route/structures · 배관 = GET …/drainage/pipe-points (읽기만)
 *   머리 두 줄 = 조합 구분(M02 경로 첫 칸) · 조합 이름(나머지 경로) — `GET /api/m02/items?all=1`
 * ========================================================================== */

import { ui_locales, currentLanguageIndex } from "@ui/ui_template_locale";
import { loadRows as loadPickerRows } from "@ui/ui_template_item_picker";
import { pathOf, rowId } from "@ui/ui_template_item_picker_data";
import { fetchStructures } from "../B05_Profile/B05_Profile_Api_Structures";
import { fetchLatestRoute, readRouteLatestCache } from "../B05_Profile/B05_Profile_Api_Fetch";
import { fetchDetailPipePoints } from "../B04_PreProcess/B04_PreProcess_Api_Fetch";
import { createDataTable } from "@ui/ui_template_data_table";
import { stationLabel } from "../common_util/common_util_station";
import { summaryTooltip } from "../common_util/common_util_summary_item";
import {
  comboId,
  summaryColumns,
  summaryStations,
  type ComboColumn,
  type ComboLabel,
} from "./B08_Quantity_Summary_Data";

function L(key: keyof typeof ui_locales): string {
  return ui_locales[key][currentLanguageIndex];
}

/** 측점 간격 — 노선 설정값 · 못 읽으면 20m. */
export async function stationInterval(projectId: string): Promise<number> {
  const latest = readRouteLatestCache(projectId) ?? (await fetchLatestRoute(projectId));
  return latest.route_params?.station_interval_m || 20;
}

function note(text: string): HTMLElement {
  const node = document.createElement("p");
  node.className = "ui-general-block__empty";
  node.textContent = text;
  return node;
}

/** 머리 글 길이에 맞춘 열 폭 — 칸은 비어 있어 글이 폭을 정함. */
const widthOf = (label: string): number => Math.min(200, Math.max(96, label.length * 13 + 24));

function buildTable(stations: number[], columns: ComboColumn[], interval: number): HTMLElement {
  const table = createDataTable({
    columns: [
      { key: "station", label: L("B08_Quantity_Summary_Station"), width: 96 },
      ...columns.map((column) => ({
        key: column.id,
        label: column.name,
        group: [column.group || L("B08_Quantity_Summary_MissingGroup")],
        title: summaryTooltip(column.item),
        className: column.missing ? "is-missing" : undefined,
        width: widthOf(column.name),
      })),
    ],
    // 칸은 아직 비움 — 사용자가 채울 자리라 「-」 대신 빈칸
    rows: stations.map((station) => ({ station: stationLabel(station, interval) })),
    frozen: 1,
    empty: "",
    caption: L("B08_Quantity_Tab_StructureSummary"),
  });
  table.root.dataset.b08Summary = "table";
  return table.root;
}

/** 탭 몸통을 그림 — 불러오는 동안 한 줄 · 실패하면 까닭 한 줄. */
export async function renderStructureSummary(host: HTMLElement, projectId: string): Promise<void> {
  host.replaceChildren(note(L("B08_Quantity_Summary_Loading")));
  try {
    const [structures, pickerRows, pipes, interval] = await Promise.all([
      fetchStructures(projectId),
      loadPickerRows(),
      // 배수 분석 전이면 관이 없음 — 구조물만으로 그림
      fetchDetailPipePoints(projectId).then(
        (response) => response.pipe_points,
        () => [],
      ),
      stationInterval(projectId).catch(() => 20),
    ]);
    const m02 = new Map(pickerRows.map((row) => [rowId(row), row]));
    const describe = (item: Parameters<typeof comboId>[0]): ComboLabel | null => {
      const row = m02.get(comboId(item));
      if (!row) return null;
      const [group = "", ...rest] = pathOf(row);
      return { group, name: rest.join(" ") || group || row.key };
    };
    const things = [...structures.structures, ...pipes];
    const stations = summaryStations(things);
    const columns = summaryColumns(things, describe);
    const parts: HTMLElement[] = [];
    if (!columns.length) parts.push(note(L("B08_Quantity_Summary_NoCombo")));
    parts.push(
      stations.length
        ? buildTable(stations, columns, interval)
        : note(L("B08_Quantity_Summary_NoStation")),
    );
    host.replaceChildren(...parts);
  } catch (error) {
    const reason = error instanceof Error ? error.message : String(error);
    host.replaceChildren(note(`${L("B08_Quantity_Summary_Failed")} — ${reason}`));
  }
}