/* =============================================================================
 * B09_Estimation_UI_Tab_Bill.ts
 * B09 설계내역서 탭 — STmate `wBoq` 본 (PLAN 12장 1차: 표시 + 들어가기)
 *
 *   - 열은 실무 설계내역서 그대로: 공종 · 명칭 · 규격 · 수량 · 단위 · 합계/노무비/재료비/경비(단가·금액) · 비고.
 *   - 머리글 줄은 ▸/▾ 로 접고, 「레벨」 고르개로 한 번에 접음(STmate `소계~총대계` 고르기의 우리 꼴).
 *   - ⭐ 줄을 누르면 그 줄 호표(일위대가) → 호표 안 줄을 누르면 단가산출근거로 들어감(브레인 판정 핵심).
 *   - 수동 단가로 선 줄 = 빨간 테두리 + 「미확정 N건」.
 *   - ⚠ 금액·합계는 서버가 실은 값 — 여기서 더하지 않음(머리글 줄 금액도 서버 합).
 * ========================================================================== */

import { createButton, showToast } from "@ui/ui_template_elements";
import type { B09Tab, B09TabContext } from "./B09_Estimation_UI_Shell_Types";
import {
  L,
  el,
  hint,
  linkButton,
  moneyCells,
  numberCell,
  quantity,
  sheetHead,
  sheetTable,
  unconfirmedBadge,
  won,
} from "./B09_Estimation_UI_Sheet";
import { loadBill, type BillDto, type BillRowDto } from "./B09_Estimation_UI_Store";

/** 접힌 머리글 줄(공종 번호) — 탭을 오가도 남음. */
const collapsed = new Set<string>();
let levelLimit = 0; // 0 = 모두

function rowMoney(row: BillRowDto): {
  unit: [string, string, string, string] | null;
  amount: [string, string, string, string] | null;
} {
  const amount: [string, string, string, string] | null =
    row.amount_krw === null
      ? null
      : [row.amount_krw, row.labor_krw, row.material_krw, row.expense_krw];
  if (row.is_group || row.unit_price_krw === null) return { unit: null, amount };
  return {
    unit: [
      row.unit_price_krw,
      row.unit_labor_krw ?? "",
      row.unit_material_krw ?? "",
      row.unit_expense_krw ?? "",
    ],
    amount,
  };
}

function isHidden(row: BillRowDto, rows: BillRowDto[]): boolean {
  if (levelLimit > 0 && row.level > levelLimit) return true;
  for (const group of rows) {
    if (
      group.is_group &&
      collapsed.has(group.item_no) &&
      row.item_no.startsWith(`${group.item_no}-`)
    ) {
      return true;
    }
  }
  return false;
}

function noteCell(row: BillRowDto, bill: BillDto, ctx: B09TabContext): HTMLTableCellElement {
  const cell = el("td", "b09s-note");
  const sheet = bill.unit_price_sheet.entries.find((entry) => entry.code === row.price_code);
  if (sheet) cell.append(linkButton(sheet.label, () => ctx.open("unit_price", sheet.code)));
  const basis = bill.price_basis.entries.filter((entry) =>
    (entry.unit_price_codes ?? []).includes(row.price_code),
  );
  for (const entry of basis) {
    cell.append(
      linkButton(`${L("B09_Sheet_Basis_Short")} ${entry.number}`, () =>
        ctx.open("price_basis", entry.code),
      ),
    );
  }
  if (row.unconfirmed > 0) cell.append(unconfirmedBadge(row.unconfirmed));
  // 비고 글 — 단산 번호는 위 단추로 보였으니 그 조각만 뺌.
  const rest = row.notes
    .map((note) => note.text)
    .filter((text) => text && text !== row.price_basis_label)
    .join(" / ");
  if (rest) cell.append(el("span", "", rest));
  return cell;
}

function drawRows(tbody: HTMLElement, bill: BillDto, ctx: B09TabContext, redraw: () => void): void {
  for (const row of bill.rows) {
    if (isHidden(row, bill.rows)) continue;
    const tr = el("tr", row.is_group ? "is-group" : "");
    const numberTd = el("td");
    if (row.is_group) {
      const toggle = el("button", "b09s-toggle", collapsed.has(row.item_no) ? "▸" : "▾");
      toggle.type = "button";
      toggle.addEventListener("click", (event) => {
        event.stopPropagation();
        if (collapsed.has(row.item_no)) collapsed.delete(row.item_no);
        else collapsed.add(row.item_no);
        redraw();
      });
      numberTd.append(toggle);
    }
    numberTd.append(document.createTextNode(row.item_no));
    const name = el("td", "", row.name);
    name.style.paddingLeft = `${6 + Math.max(0, row.level - 1) * 12}px`;
    const { unit, amount } = rowMoney(row);
    tr.append(
      numberTd,
      name,
      el("td", "", row.spec),
      numberCell(
        row.is_group ? "" : quantity(row.quantity_shown ?? row.quantity, row.quantity_digits),
      ),
      el("td", "", row.unit),
      ...moneyCells(unit, amount),
    );
    if (row.is_group) {
      tr.append(el("td"));
    } else {
      tr.append(noteCell(row, bill, ctx));
      if (row.unconfirmed > 0) tr.classList.add("is-manual");
      if (row.price_code) {
        tr.classList.add("is-clickable");
        tr.title = L("B09_Sheet_Open_UnitPrice");
        tr.addEventListener("click", () => ctx.open("unit_price", row.price_code));
      }
    }
    tbody.append(tr);
  }
}

function levelPicker(bill: BillDto, redraw: () => void): HTMLElement {
  const select = el("select", "ui-input");
  const deepest = Math.max(1, ...bill.rows.map((row) => row.level));
  const all = el("option", "", L("B09_Sheet_Level_All"));
  all.value = "0";
  select.append(all);
  for (let level = 1; level < deepest; level += 1) {
    const option = el("option", "", `${level}${L("B09_Sheet_Level_Upto")}`);
    option.value = String(level);
    select.append(option);
  }
  select.value = String(levelLimit);
  select.addEventListener("change", () => {
    levelLimit = Number(select.value);
    redraw();
  });
  const label = el("label", "b09s-bar", L("B09_Sheet_Level"));
  label.append(select);
  return label;
}

function drawBill(ctx: B09TabContext, bill: BillDto, reload: () => void): void {
  const redraw = (): void => {
    ctx.body.replaceChildren();
    drawBill(ctx, bill, reload);
  };
  const bar = el("div", "b09s-bar");
  bar.append(
    createButton({ label: L("B09_Sheet_Reload"), variant: "ghost", onClick: reload }),
    levelPicker(bill, redraw),
    el(
      "span",
      "",
      `${L("B09_Sheet_BodyTotal")} ${won(bill.summary.body_total_krw)}${L("B09_Sheet_Won")}`,
    ),
  );
  if (bill.summary.unconfirmed_count > 0)
    bar.append(unconfirmedBadge(bill.summary.unconfirmed_count));
  ctx.body.append(bar);

  const { wrap, tbody } = sheetTable(
    sheetHead([
      L("B09_Sheet_Col_ItemNo"),
      L("B09_Sheet_Col_Name"),
      L("B09_Sheet_Col_Spec"),
      L("B09_Sheet_Col_Quantity"),
      L("B09_Sheet_Col_Unit"),
    ]),
  );
  drawRows(tbody, bill, ctx, redraw);
  const sum = el("tr", "is-sum");
  sum.append(el("td"), el("td", "", L("B09_Sheet_BodyTotal")), el("td"), el("td"), el("td"));
  sum.append(...moneyCells(null, [bill.summary.body_total_krw, "", "", ""]), el("td"));
  tbody.append(sum);
  ctx.body.append(wrap);

  // 금액을 못 세운 줄 — 0 으로 안 때우고 이름째 보임(서버 `missing`).
  if (bill.summary.missing.length > 0) {
    const details = el("details");
    details.append(
      el(
        "summary",
        "b09s-hint b09s-hint--warn",
        `${L("B09_Sheet_Missing")} ${bill.summary.missing.length}${L("B09_Sheet_Count")}`,
      ),
    );
    for (const item of bill.summary.missing) {
      details.append(hint(`${item.name} — ${item.reason}`));
    }
    ctx.body.append(details);
  }
  for (const note of bill.summary.notes) ctx.body.append(hint(note));
}

export const billTab: B09Tab = {
  key: "boq",
  label: () => L("B09_Estimation_Tab_Boq"),
  render(ctx) {
    if (!ctx.projectId) {
      ctx.body.append(hint(L("B09_Sheet_NoProject")));
      return;
    }
    const projectId = ctx.projectId;
    const show = (force: boolean): void => {
      ctx.body.replaceChildren(hint(L("B09_Sheet_Loading")));
      loadBill(projectId, force)
        .then((bill) => {
          ctx.body.replaceChildren();
          drawBill(ctx, bill, () => show(true));
        })
        .catch((error: Error) => {
          ctx.body.replaceChildren(hint(`${L("B09_Sheet_LoadFailed")} ${error.message}`, true));
          showToast(L("B09_Sheet_LoadFailed"), "error");
        });
    };
    show(false);
  },
};