// 원본 엑셀형 수량산출서(TFRMMULEXCEL) 웹 편집 화면 — 셀 고르기·수식줄 편집·다시 계산, 셀 합(우·상·좌·하 btnSum*),
// 수량으로 지정(popSetMullang)·지정 해제(popSetFree) = 셀 ↔ 수량 항목 연결(sheet.excelLinks). 항목 수량 = 연결 셀 값(산출서 자리수).
// 원본 파일 속 셀↔항목 대응은 찾지 못해, 가져올 때 값이 같은 셀 하나(합계 수식·아래쪽 우선)를 「추정」 연결로 둔다.
// 편집한 엑셀형 산출서는 .xls 로 다시 쓰지 못하므로 ESTX 저장을 막는다(sheet.excelEdited).
const EstExcelView = (() => {
  const L = (n) => EstExcelSheet.letters(n);

  function render(sheet, state) {
    if (!sheet?.excel?.length) return "";
    const { esc, number } = EstApp,
      sel = state.excelCell?.sheet === sheet.Code ? state.excelCell : null,
      links = sheet.excelLinks || {};
    const linked = new Map(
      Object.entries(links).map(([code, l]) => [`${l.n},${l.row},${l.col}`, { code, ...l }]),
    );
    return sheet.excel
      .map(({ name, cells }, n) => {
        const keys = Object.keys(cells).map((k) => k.split(",").map(Number));
        const rows = Math.max(20, ...keys.map(([r]) => r + 2)),
          cols = Math.min(40, Math.max(8, ...keys.map(([, c]) => c + 2)));
        const raw = sel && sel.n === n ? cells[`${sel.row},${sel.col}`] : null;
        const bar =
          sel && sel.n === n
            ? `${L(sel.col)}${sel.row + 1} <input data-excel-bar style="width:50%" value="${esc(raw ? (typeof raw.formula === "string" ? `=${raw.formula}` : (raw.value ?? "")) : "")}" aria-label="수식줄">`
            : "셀을 누르면 수식줄에서 고칩니다.";
        const items = (sheet.items || [])
          .map(
            (i) =>
              `<option value="${esc(i.Code)}">${esc(i.Code)} ${esc(i.Name ?? "")} ${esc(i.Size ?? "")}</option>`,
          )
          .join("");
        const tools =
          sel && sel.n === n
            ? ` <button data-action="excel-sum" data-dir="right">우측 합</button><button data-action="excel-sum" data-dir="up">위 합</button><button data-action="excel-sum" data-dir="left">좌측 합</button><button data-action="excel-sum" data-dir="down">아래 합</button> <select data-excel-item aria-label="수량 항목">${items}</select><button data-action="excel-link">수량으로 지정</button><button data-action="excel-unlink">지정 해제</button>`
            : "";
        const body = Array.from({ length: rows }, (_, r) => {
          const tds = Array.from({ length: cols }, (_, c) => {
            const cell = cells[`${r},${c}`],
              link = linked.get(`${n},${r},${c}`),
              chosen = sel && sel.n === n && sel.row === r && sel.col === c;
            const value =
              cell == null
                ? ""
                : typeof cell.value === "number"
                  ? number(cell.value)
                  : esc(cell.value);
            const style = [
              cell?.formula ? "font-weight:bold" : "",
              link ? "background:#e6f4ea" : "",
              chosen ? "outline:2px solid #316ea5" : "",
            ]
              .filter(Boolean)
              .join(";");
            const title = [
              typeof cell?.formula === "string" ? `=${cell.formula}` : "",
              link ? `수량: ${link.code}${link.inferred ? " (추정 연결)" : ""}` : "",
            ]
              .filter(Boolean)
              .join(" · ");
            return `<td data-excel-pick="${n},${r},${c}"${style ? ` style="${style}"` : ""}${title ? ` title="${esc(title)}"` : ""}>${value}</td>`;
          }).join("");
          return `<tr><th>${r + 1}</th>${tds}</tr>`;
        }).join("");
        return `<h4>엑셀형 산출서 · ${esc(name)}</h4><div class="business-tools">${bar}${tools}</div><div style="overflow:auto;max-height:420px"><table class="sheet" style="font-size:11px"><thead><tr><th></th>${Array.from({ length: cols }, (_, c) => `<th>${L(c)}</th>`).join("")}</tr></thead><tbody>${body}</tbody></table></div>`;
      })
      .join("");
  }

  function sheetOf(state) {
    return state.project.quantitySheets?.find((s) => s.Code === state.quantitySheet);
  }
  function setCell(sheet, n, row, col, text) {
    const cells = sheet.excel[n].cells,
      k = `${row},${col}`,
      t = String(text ?? "");
    if (t === "") delete cells[k];
    else if (t.startsWith("=")) cells[k] = { value: 0, formula: t.slice(1) };
    else {
      const v = Number(t.replaceAll(",", ""));
      cells[k] = { value: t.trim() !== "" && Number.isFinite(v) ? v : t };
    }
    sheet.excelEdited = true;
    return EstExcelSheet.recalc(cells);
  }

  function install() {
    document.addEventListener("click", (event) => {
      const td = event.target.closest("[data-excel-pick]");
      if (!td) return;
      const [n, row, col] = td.dataset.excelPick.split(",").map(Number);
      EstApp.state.excelCell = { sheet: EstApp.state.quantitySheet, n, row, col };
      EstApp.render();
    });
    document.addEventListener("change", (event) => {
      if (event.target.dataset.excelBar === undefined) return;
      const state = EstApp.state,
        sel = state.excelCell,
        value = event.target.value;
      let errors = [];
      EstApp.change(() => {
        errors = setCell(sheetOf(state), sel.n, sel.row, sel.col, value);
      }, false);
      if (errors.length) state.notice = errors.slice(0, 3).join(" / ");
    });
  }

  function handle(name, state, node) {
    if (!["excel-sum", "excel-link", "excel-unlink"].includes(name)) return false;
    const sheet = sheetOf(state),
      sel = state.excelCell;
    if (!sheet?.excel || !sel) throw Error("엑셀형 산출서에서 셀을 고르세요.");
    if (name === "excel-sum") {
      const formula = EstExcelSheet.sumFormula(
        sheet.excel[sel.n].cells,
        sel.row,
        sel.col,
        node.dataset.dir,
      );
      EstApp.change(() => setCell(sheet, sel.n, sel.row, sel.col, `=${formula}`), false);
    } else {
      const code = document.querySelector("[data-excel-item]")?.value;
      EstApp.change(() => {
        sheet.excelLinks ||= {};
        for (const [k, l] of Object.entries(sheet.excelLinks))
          if (l.n === sel.n && l.row === sel.row && l.col === sel.col) delete sheet.excelLinks[k];
        if (name === "excel-link") {
          if (!code) throw Error("수량 항목을 고르세요.");
          sheet.excelLinks[code] = { n: sel.n, row: sel.row, col: sel.col };
        }
      }, false);
    }
    return true;
  }

  if (typeof document !== "undefined" && document.addEventListener) install();
  return { render, setCell, handle };
})();