/* =============================================================================
 * B08_Quantity_UI_Summary.ts
 * 1탭 구조물 집계표(PLAN 61-1) — 줄 = 측점 · 열 = 저장된 구조물 조합 · 맨 아래 계 줄.
 * 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`
 *   횡단배수 열 · 칸 = GET …/quantity/summary(서버 단독 · PLAN 98 · 120) — 머리 구조물 · 형식 · 규격
 *     3단 + 단위 줄 · 「관 공」 맨 윗 머리 = 관에 이은 조합 경로(있으면) · 서버가 펼친 종류(`types`)는
 *     조합 열에서 뺌 · 다른 구조물 열은 조합 그대로
 *   열 폭 = 맨 아래 단 글(+ 칸 값)만 잼 · 위 단 머리는 줄바꿈(`B08_Quantity_UI_Page.css` · 120-2)
 *   줄을 누르면 그 측점의 구조물도 모달(PLAN 95-3 · `B08_Quantity_UI_Drawing` 은 누를 때 `import()`)
 *   커플링 열 = 좌측 패널 1본 길이로 바로 다시 셈(관마다 길이 `pipes` · `recountCouplings` · PLAN 122)
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";
import { ui_locales, currentLanguageIndex } from "@ui/ui_template_locale";
import { loadRows as loadPickerRows } from "@ui/ui_template_item_picker";
import { pathOf, rowId, type PickerRow } from "@ui/ui_template_item_picker_data";
import { showToast } from "@ui/ui_template_elements";
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, type DataColumn, type DataRow } from "@ui/ui_template_data_table";
import { pipeStructureId } from "@ui/ui_template_item_picker_project";
import { stationLabel } from "../common_util/common_util_station";
import { summaryTooltip, type SummaryItem } from "../common_util/common_util_summary_item";
import {
  combosAt,
  comboId,
  summaryColumns,
  summaryStations,
  type ComboColumn,
  type ComboLabel,
  type PlacedItem,
  type StationCombo,
  widthOf,
} from "./B08_Quantity_Summary_Data";
import { recountCouplings, type PipeLength } from "./B08_Quantity_Options_Calc";
import { liveOnePipe, onOptionsChange } from "./B08_Quantity_UI_Options";

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;
}

/** 서버 배관 집계(PLAN 98-1) — 열 머리 `group`(구조물 · 형식 · 규격) + `label`(단위) · 열마다 조합 id. */
interface PipeColumn {
  id: string;
  group: string[];
  label: string;
  combos: string[];
}
interface PipeSummary {
  columns: PipeColumn[];
  rows: Array<{ chainage_m: number; values: Record<string, number> }>;
  total: Record<string, number>;
  notes: string[];
  /** 서버가 펼친 종류(`type_id` · 관 지점은 `facility`) — 조합 열에서 뺌 */
  types: string[];
  one_length_m: number | null;
  pipes: PipeLength[];
}

async function fetchPipeSummary(projectId: string): Promise<PipeSummary> {
  const response = await fetch(`${API_BASE_URL}/projects/${projectId}/quantity/summary`, {
    credentials: "include",
  });
  if (!response.ok) throw new Error(`${response.status} ${await response.text()}`);
  return response.json();
}

const PIPE_TOP = "관 공";
const stationKey = (station: number): number => Math.round(station * 100);
/** 열 소수 자리 — 칸 · 계 값이 쓰는 만큼(최대 2). */
const placesOf = (values: number[]): number =>
  Math.max(0, ...values.map((v) => (String(Math.round(v * 100) / 100).split(".")[1] ?? "").length));

/** 배관 열 → 표 열 · 「관 공」 맨 윗 머리 = 관에 이은 조합 경로(M02 에 있으면 · 조합 잇기 98). */
function pipeColumns(summary: PipeSummary, comboPath: (id: string) => string | null): DataColumn[] {
  const top =
    summary.columns
      .filter((column) => column.group[0] === PIPE_TOP)
      .flatMap((column) => column.combos)
      .map(comboPath)
      .find((path) => !!path) ?? PIPE_TOP;
  return summary.columns.map((column) => {
    const group = column.group[0] === PIPE_TOP ? [top, ...column.group.slice(1)] : column.group;
    const values = [
      ...summary.rows.map((row) => row.values[column.id]),
      summary.total[column.id],
    ].filter((value): value is number => typeof value === "number");
    const decimals = placesOf(values);
    const texts = values.map((value) =>
      value.toLocaleString("en-US", {
        minimumFractionDigits: decimals,
        maximumFractionDigits: decimals,
      }),
    );
    return {
      key: column.id,
      label: column.label,
      group,
      kind: "number",
      decimals,
      title: [...group, column.label].join(" › "),
      width: widthOf(column.label, ...texts),
    };
  });
}

function buildTable(
  stations: number[],
  columns: ComboColumn[],
  pipe: PipeSummary | null,
  comboPath: (id: string) => string | null,
  interval: number,
  onRowClick: (station: number, label: string) => void,
): HTMLElement {
  const values = new Map((pipe?.rows ?? []).map((row) => [stationKey(row.chainage_m), row.values]));
  const total: DataRow | null = pipe?.columns.length
    ? { station: L("B08_Quantity_Summary_Total"), ...pipe.total }
    : null;
  const labels = stations.map((station) => stationLabel(station, interval));
  const stationHead = L("B08_Quantity_Summary_Station");
  const table = createDataTable({
    columns: [
      { key: "station", label: stationHead, width: widthOf(stationHead, ...labels) },
      ...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),
      })),
      ...(pipe ? pipeColumns(pipe, comboPath) : []),
    ],
    // 조합 열 칸은 아직 비움 — 사용자가 채울 자리라 「-」 대신 빈칸 · 배관 칸 = 서버 값
    rows: stations.map((station, i) => ({
      station: labels[i],
      ...values.get(stationKey(station)),
    })),
    total,
    onRowClick: (i) => onRowClick(stations[i], labels[i]),
    frozen: 1,
    empty: "",
    caption: L("B08_Quantity_Tab_StructureSummary"),
  });
  table.root.dataset.b08Summary = "table";
  return table.root;
}

/** 행 누름 — 카드 · CAD 묶음은 이때 처음 받음. */
async function openSheets(
  projectId: string,
  station: string,
  combos: StationCombo[],
  rows: Map<string, PickerRow>,
  describe: (item: SummaryItem) => ComboLabel | null,
): Promise<void> {
  try {
    const { openStructureSheets } = await import("./B08_Quantity_UI_Drawing");
    openStructureSheets({ projectId, station, combos, rows, describe });
  } catch (error) {
    showToast(`${L("B08_Quantity_Drawing_Failed")} — ${String(error)}`, "error");
  }
}

/** 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, pipe] = await Promise.all([
      fetchStructures(projectId),
      loadPickerRows(),
      // 배수 분석 전이면 관이 없음 — 구조물만으로 그림
      fetchDetailPipePoints(projectId).then(
        (response) => response.pipe_points,
        () => [],
      ),
      stationInterval(projectId).catch(() => 20),
      // 배관 집계 실패 = 까닭 한 줄 · 나머지 표는 그대로
      fetchPipeSummary(projectId).catch((error: unknown) => String(error)),
    ]);
    const m02 = new Map(pickerRows.map((row) => [rowId(row), row]));
    const describe = (item: SummaryItem): 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 comboPath = (id: string): string | null => {
      const row = m02.get(id);
      return row ? pathOf(row).join(" ") : null;
    };
    const placed = pipes.map((point) => ({
      ...point,
      structure_id: pipeStructureId(point.chainage_m),
    }));
    const things: PlacedItem[] = [...structures.structures, ...placed];
    const stations = summaryStations(things);
    // 횡단배수는 서버 집계 열(98 · 120) — 조합 열은 다른 구조물 · 시설만(모달은 그대로 전부)
    const saved = typeof pipe === "string" ? null : pipe;
    const served = new Set(saved?.types ?? []);
    const others = [
      ...structures.structures.filter((item) => !served.has(item.type_id)),
      ...placed.filter((point) => !served.has(point.facility ?? "pipe")),
    ];
    const columns = summaryColumns(others, describe);
    const live = (): PipeSummary | null =>
      saved && recountCouplings(saved, liveOnePipe(projectId, saved.one_length_m));
    const summary = live();
    const parts: HTMLElement[] = [];
    if (typeof pipe === "string") parts.push(note(`${L("B08_Quantity_Summary_Failed")} — ${pipe}`));
    for (const text of summary?.notes ?? []) parts.push(note(text));
    if (!columns.length && !summary?.columns.length)
      parts.push(note(L("B08_Quantity_Summary_NoCombo")));
    const draw = (): HTMLElement =>
      stations.length
        ? buildTable(stations, columns, live(), comboPath, interval, (station, label) =>
            openSheets(projectId, label, combosAt(things, station), m02, describe),
          )
        : note(L("B08_Quantity_Summary_NoStation"));
    let table = draw();
    parts.push(table);
    host.replaceChildren(...parts);
    onOptionsChange(host, () => {
      const next = draw();
      table.replaceWith(next);
      table = next;
    });
  } catch (error) {
    const reason = error instanceof Error ? error.message : String(error);
    host.replaceChildren(note(`${L("B08_Quantity_Summary_Failed")} — ${reason}`));
  }
}