/* =============================================================================
 * B08_Quantity_UI_Material.ts
 * 구조물 탭 보조 탭 셋(PLAN 121-1) — 총괄자재수량집계표 · 콘크리트소요자재집계표 · 자재수량집계표.
 * 실무 엑셀(4.2 수량산출(2공구).xlsx) 꼴 · 공용 표(`createDataTable` · 다단 머리 · 합계 · 고정 열).
 *
 *   자료 = GET …/quantity/materials(구조물 집계표 계 · 저장된 사용자 값 · 서버가 셈한 세 표)
 *   고칠 칸 = 단위수량 · ㎥당 배합 · 할증 % — 조작 = 캐시(`b08-materials`) + 짝 계산(`Material_Calc.ts`)으로 바로
 *   총괄 모래 · 자갈 · 시멘트 할증 = 좌측 패널 값(PLAN 124 · 표에서 안 고침 · 패널 조작에 바로 다시 셈)
 *   [저장] = PUT …/quantity/materials → 서버가 정본으로 다시 셈 · 캐시 비움 · 자동 저장 없음
 *   값 없는 줄은 숨김(화면만 · 셈 · 열 · 단위수량은 그대로) · 표는 공용 카드 안(PLAN 143-3)
 * ========================================================================== */

import { API_BASE_URL } from "@config/config_frontend";
import {
  createButton,
  createCard,
  hideLoadingOverlay,
  showLoadingOverlay,
  showToast,
} from "@ui/ui_template_elements";
import { createDataTable, type DataColumn, type DataRow } from "@ui/ui_template_data_table";
import { clearState, readState, writeState } from "../A00_Common/b_page_state";
import {
  blankUnitRows,
  computeMaterialSheets,
  MIX_FIELDS,
  type Cells,
  type MaterialOverrides,
  type MaterialSheets,
  type SummarySource,
} from "./B08_Quantity_Material_Calc";
import { liveSurcharge, onOptionsChange } from "./B08_Quantity_UI_Options";

export type MaterialSheetId = "material" | "concrete" | "quantity";

interface Payload {
  source: SummarySource;
  overrides: MaterialOverrides;
  /** 좌측 패널 할증 저장본(기본 채움) */
  surcharge_pct: Cells;
  /** 구조물 집계표 알림(「집수정 모양 기록 없음 n곳」 등) — 총괄 · 콘크리트 위 빈 까닭(131) */
  notes?: string[];
  sheets: MaterialSheets;
}

const BASIS =
  "구조물 수량 기준 — 일위대가 재료와 별개(두 번 세지 않게 일위대가 재료배합과 겹치지 않는지 확인)";
const HINTS: Record<MaterialSheetId, string> = {
  material:
    "합계 = 끝수(수량 × (1 + 할증)) — 레미콘 ROUND 2 · 철근 · 와이어메쉬 ROUND 3 · 시멘트 ROUND 0 · 그 밖 올림 · 할증 % 기본 = 건설품셈 1-3-1 · 관급 파형강관 0 — 고칠 수 있음 · 모래 · 자갈 · 시멘트는 좌측 패널",
  concrete: "㎥당 = 산림품셈 12-1-3 (B) 배합 · 건축 9-1-1 모르터 기본(무근은 빈칸) — 고칠 수 있음",
  quantity: "수량 = 구조물 수량 × 단위수량 · 단위수량은 빈칸(사용자 입력) · 관매설은 1",
};
const HIDDEN = "값 없는 줄은 숨김";

/** 보일 줄 차례(원래 줄 번호) — 값 없는 줄은 숨김(143-3) */
const shown = <T>(rows: readonly T[], has: (row: T) => boolean): number[] =>
  rows.flatMap((row, i) => (has(row) ? [i] : []));
const anyValue = (cells: Cells): boolean => Object.values(cells).some((v) => v != null);

async function request<T>(path: string, init: RequestInit = {}): Promise<T> {
  const response = await fetch(`${API_BASE_URL}${path}`, {
    credentials: "include",
    headers: { "Content-Type": "application/json" },
    ...init,
  });
  const body = (await response.json().catch(() => null)) as { detail?: unknown } | null;
  if (!response.ok) {
    const detail = body?.detail;
    throw new Error(typeof detail === "string" ? detail : `HTTP ${response.status}`);
  }
  return body as T;
}

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

/** 숫자 열 — 최대 3 자리 · 끝 0 지움(고친 값 자리가 줄마다 다름) */
const numberColumn = (column: DataColumn): DataColumn => ({
  kind: "number",
  decimals: 3,
  trim: true,
  ...column,
});

/** 글 → 값 · 빈칸 = null(일부러 비움) · 수가 아니면 undefined(무시) */
function parse(text: string): number | null | undefined {
  const t = text.replace(/,/g, "").trim();
  if (!t) return null;
  const v = Number(t);
  return Number.isFinite(v) ? v : undefined;
}

interface Table {
  columns: DataColumn[];
  rows: DataRow[];
  total: DataRow | null;
  frozen: number;
  editable: (index: number, key: string) => boolean;
  /** 고친 칸 → 사용자 값 자리 [표, 줄 키, 칸 키] */
  target: (index: number, key: string) => [Record<string, Cells> | Cells, string, string | null];
}

function quantityTable(s: MaterialSheets, o: MaterialOverrides): Table {
  const { materials, rows, total } = s.quantity;
  const keep = shown(rows, (row) => row.qty != null || anyValue(row.units));
  const rowsOut: DataRow[] = keep.flatMap((at) => {
    const row = rows[at];
    const unit: DataRow = {
      name: row.name,
      spec: row.spec,
      qty: row.qty,
      unit: row.unit,
      kind: "단위수량",
    };
    const amount: DataRow = { kind: "수량" };
    for (const m of materials) {
      unit[`m:${m.key}`] = row.units[m.key];
      amount[`m:${m.key}`] = row.amounts[m.key];
    }
    return [unit, amount];
  });
  const totalRow: DataRow = { name: "계", kind: "수량" };
  for (const m of materials) totalRow[`m:${m.key}`] = total[m.key];
  return {
    columns: [
      { key: "name", label: "구분", width: 120 },
      { key: "spec", label: "규격", width: 120 },
      numberColumn({ key: "qty", label: "수량", width: 72 }),
      { key: "unit", label: "단위", width: 56 },
      { key: "kind", label: "구분", width: 72 },
      ...materials.map((m) =>
        numberColumn({
          key: `m:${m.key}`,
          label: m.unit,
          group: m.spec ? [m.name, m.spec] : [m.name],
          title: [m.name, m.spec, m.unit].filter(Boolean).join(" › "),
          width: 76,
        }),
      ),
    ],
    rows: rowsOut,
    total: totalRow,
    frozen: 5,
    editable: (i, key) => i % 2 === 0 && key.startsWith("m:"),
    target: (i, key) => [o.units, rows[keep[i / 2]].id, key.slice(2)],
  };
}

const MIX_LABEL: Record<(typeof MIX_FIELDS)[number], [string, string, string]> = {
  cement: ["시멘트", "㎥당(kg)", "수량(kg)"],
  sand: ["모래", "㎥당(㎥)", "수량(㎥)"],
  gravel: ["자갈", "㎥당(㎥)", "수량(㎥)"],
};

function concreteTable(s: MaterialSheets, o: MaterialOverrides): Table {
  const { rows, total } = s.concrete;
  const keep = shown(rows, (row) => row.qty != null || anyValue(row.amounts));
  const rowsOut: DataRow[] = keep.map((at, i) => {
    const row = rows[at];
    const out: DataRow = {
      name: i > 0 && rows[keep[i - 1]].name === row.name ? "" : row.name,
      spec: row.spec,
      qty: row.qty,
    };
    for (const f of MIX_FIELDS) {
      out[`per:${f}`] = row.per[f];
      out[`amt:${f}`] = row.amounts[f];
    }
    return out;
  });
  const totalRow: DataRow = { name: "계" };
  for (const f of MIX_FIELDS) totalRow[`amt:${f}`] = total[f];
  return {
    columns: [
      { key: "name", label: "구분", width: 88 },
      { key: "spec", label: "규격", width: 110 },
      numberColumn({ key: "qty", label: "수량(㎥)", width: 80 }),
      ...MIX_FIELDS.flatMap((f) => [
        numberColumn({
          key: `per:${f}`,
          label: MIX_LABEL[f][1],
          group: [MIX_LABEL[f][0]],
          width: 84,
        }),
        numberColumn({
          key: `amt:${f}`,
          label: MIX_LABEL[f][2],
          group: [MIX_LABEL[f][0]],
          width: 96,
        }),
      ]),
    ],
    rows: rowsOut,
    total: totalRow,
    frozen: 2,
    editable: (_i, key) => key.startsWith("per:"),
    target: (i, key) => [o.mix, rows[keep[i]].key, key.slice(4)],
  };
}

function totalTable(s: MaterialSheets, o: MaterialOverrides): Table {
  const { rows } = s.material;
  const keep = shown(rows, (row) => row.qty != null || row.amount != null);
  return {
    columns: [
      { key: "group", label: "구분", width: 96 },
      { key: "spec", label: "규격", width: 120 },
      { key: "unit", label: "단위", width: 56 },
      numberColumn({ key: "qty", label: "수량", width: 96 }),
      numberColumn({ key: "surcharge", label: "할증(%)", width: 72 }),
      numberColumn({ key: "amount", label: "합계", width: 96 }),
      { key: "note", label: "비고", width: 96 },
    ],
    rows: keep.map((at, i) => {
      const row = rows[at];
      return {
        group: i > 0 && rows[keep[i - 1]].group === row.group ? "" : row.group,
        spec: row.spec,
        unit: row.unit,
        qty: row.qty,
        surcharge: row.surcharge,
        amount: row.amount,
        note: row.panel ? "할증 = 좌측 패널" : "",
      };
    }),
    total: null,
    frozen: 2,
    editable: (i, key) => key === "surcharge" && !rows[keep[i]].panel,
    target: (i) => [o.surcharge, rows[keep[i]].key, null],
  };
}

const BUILD: Record<MaterialSheetId, (s: MaterialSheets, o: MaterialOverrides) => Table> = {
  material: totalTable,
  concrete: concreteTable,
  quantity: quantityTable,
};

/** 보조 탭 한 장 — 불러오는 동안 한 줄 · 실패하면 까닭 한 줄. */
export async function renderMaterialSheet(
  host: HTMLElement,
  projectId: string,
  sheet: MaterialSheetId,
): Promise<void> {
  host.replaceChildren(note("자재 집계표를 불러오는 중…"));
  let payload: Payload;
  try {
    payload = await request<Payload>(`/projects/${projectId}/quantity/materials`);
  } catch (error) {
    host.replaceChildren(note(`자재 집계표를 불러오지 못했습니다 — ${String(error)}`));
    return;
  }
  const draft = readState<MaterialOverrides>("b08-materials", projectId);
  let overrides: MaterialOverrides = draft ?? payload.overrides;
  const calc = (): MaterialSheets =>
    computeMaterialSheets(
      payload.source,
      overrides,
      liveSurcharge(projectId, payload.surcharge_pct),
    );
  let sheets = calc();

  const save = createButton({ label: "저장", variant: "filled", onClick: () => void saveAll() });
  save.dataset.b08MaterialSave = "";
  const toolbar = document.createElement("div");
  toolbar.className = "b08-material__toolbar";
  const notes = document.createElement("div");
  notes.append(note(BASIS), note(`${HINTS[sheet]} · ${HIDDEN}`));
  if (sheet !== "quantity") {
    // 빈 까닭 한 줄(131) — 단위수량 빈 줄 · 서버 알림 · 빈 칸은 빈칸 그대로
    const blank = blankUnitRows(sheets);
    const why = [
      ...(blank ? [`단위수량 빈 줄 ${blank}개 — 자재수량 탭에서 넣음`] : []),
      ...(payload.notes ?? []),
    ];
    if (why.length) {
      const reason = note(`빈 칸 까닭 — ${why.join(" · ")}`);
      reason.dataset.b08MaterialWhy = "";
      notes.append(reason);
    }
  }
  toolbar.append(notes, save);

  let built = BUILD[sheet](sheets, overrides);
  const table = createDataTable({
    columns: built.columns,
    rows: built.rows,
    total: built.total,
    frozen: built.frozen,
    empty: "",
    caption: BASIS,
    editable: (i, key) => built.editable(i, key),
    onEdit: (i, key, text) => {
      const value = parse(text);
      if (value !== undefined) {
        const [table_, row, cell] = built.target(i, key);
        if (cell === null) (table_ as Cells)[row] = value;
        else
          (table_ as Record<string, Cells>)[row] = {
            ...(table_ as Record<string, Cells>)[row],
            [cell]: value,
          };
        writeState("b08-materials", overrides, projectId);
        sheets = calc();
      }
      redraw();
    },
  });
  table.root.dataset.b08Material = sheet;
  const redraw = (): void => {
    built = BUILD[sheet](sheets, overrides);
    table.setRows(built.rows, built.total);
  };
  host.replaceChildren(createCard({ body: [toolbar, table.root] }));
  onOptionsChange(host, () => {
    sheets = calc();
    redraw();
  });

  /** [저장] — 사용자 값을 서버로 · 서버가 다시 셈한 표로 그림 · 캐시 비움 */
  const saveAll = async (): Promise<void> => {
    showLoadingOverlay();
    try {
      payload = await request<Payload>(`/projects/${projectId}/quantity/materials`, {
        method: "PUT",
        body: JSON.stringify({ overrides }),
      });
      overrides = payload.overrides;
      sheets = calc(); // 서버 정본 + 아직 저장 안 한 좌측 패널 할증
      clearState("b08-materials", projectId);
      redraw();
      showToast("자재 집계표를 저장했습니다.", "success");
    } catch (error) {
      showToast(`저장하지 못했습니다 — ${String(error)}`, "error");
    } finally {
      hideLoadingOverlay();
    }
  };
}