import { extname } from 'node:path';
import ExcelJS from 'exceljs';
import { fromBufferPromise, type Entry, type ZipFile } from 'yauzl';
import type { DocumentConversionErrorCode } from './document-converter.js';

const XLSX_MAGIC = Buffer.from([0x50, 0x4b, 0x03, 0x04]);
const XLS_MAGIC = Buffer.from([0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1]);
const DEFAULT_MAX_INPUT_BYTES = 10 * 1024 * 1024;
const DEFAULT_MAX_UNCOMPRESSED_BYTES = 64 * 1024 * 1024;
const DEFAULT_MAX_ARCHIVE_ENTRIES = 2_048;
const DEFAULT_MAX_DATA_ROWS = 5_000;
const ABSOLUTE_MAX_DATA_ROWS = 5_000;
const MAX_PASSENGER_SEQUENCE = 5_000;
const MAX_HEADER_ROW = 100;
const EXPECTED_HEADER_ROW = 2;
const SOURCE_COLUMN_COUNT = 14;

export const PASSENGER_ROSTER_WORKBOOK_VERSION = 'ltjt-passenger-roster-workbook-v1.1.0';

const SOURCE_HEADERS = [
  '序号', '姓名', '英文姓名', '性别', '身份证号码', '出生日期', '年龄', '出生地',
  '护照号码', '签发地', '签发日期', '有效期', '电话', '备注'
] as const;

export const CANONICAL_PASSENGER_HEADERS = [
  '序号', '姓名', 'NAME', '性别', '出生日期', '出生地', '证件类型', '证件号码',
  '签发地', '签发日', '有效期', '电话', '备注'
] as const;

export type PassengerRosterWorkbookErrorCode =
  | 'roster_workbook_empty'
  | 'roster_workbook_too_large'
  | 'roster_workbook_unsupported_format'
  | 'roster_workbook_format_mismatch'
  | 'roster_workbook_converter_unavailable'
  | 'roster_workbook_conversion_failed'
  | 'roster_workbook_invalid_xlsx'
  | 'roster_workbook_archive_limit'
  | 'roster_workbook_unsafe_content'
  | 'roster_workbook_ambiguous_sheet'
  | 'roster_workbook_hidden_data'
  | 'roster_workbook_header_not_found'
  | 'roster_workbook_ambiguous_header'
  | 'roster_workbook_header_row_invalid'
  | 'roster_workbook_formula_not_allowed'
  | 'roster_workbook_formula_result_missing'
  | 'roster_workbook_unexpected_column'
  | 'roster_workbook_non_contiguous_rows'
  | 'roster_workbook_row_limit'
  | 'roster_workbook_no_data'
  | 'roster_workbook_invalid_sequence'
  | 'roster_workbook_sequence_limit'
  | 'roster_workbook_duplicate_sequence'
  | 'roster_workbook_identity_card_not_supported'
  | 'roster_workbook_invalid_date'
  | 'roster_workbook_invalid_identifier'
  | 'roster_workbook_invalid_cell';

const ERROR_MESSAGES: Record<PassengerRosterWorkbookErrorCode, string> = {
  roster_workbook_empty: '名单工作簿为空',
  roster_workbook_too_large: '名单工作簿超过大小限制',
  roster_workbook_unsupported_format: '名单附件格式不受支持',
  roster_workbook_format_mismatch: '名单附件扩展名、类型或文件内容不匹配',
  roster_workbook_converter_unavailable: '旧版名单工作簿转换器不可用',
  roster_workbook_conversion_failed: '旧版名单工作簿转换失败',
  roster_workbook_invalid_xlsx: '名单工作簿不是有效的 XLSX',
  roster_workbook_archive_limit: '名单工作簿解压规模超过限制',
  roster_workbook_unsafe_content: '名单工作簿包含不允许的宏、外部链接或嵌入内容',
  roster_workbook_ambiguous_sheet: '名单工作簿必须且只能包含一个工作表',
  roster_workbook_hidden_data: '名单工作簿包含隐藏的非空数据',
  roster_workbook_header_not_found: '未找到完整的 14 列名单表头',
  roster_workbook_ambiguous_header: '名单工作簿包含多个可识别的名单表头',
  roster_workbook_header_row_invalid: '名单工作簿第 2 行必须是完整的 14 列名单表头',
  roster_workbook_formula_not_allowed: '名单工作簿包含不允许的公式',
  roster_workbook_formula_result_missing: '名单工作簿公式没有可验证的缓存结果',
  roster_workbook_unexpected_column: '名单数据包含 14 列之外的内容',
  roster_workbook_non_contiguous_rows: '名单数据行不连续',
  roster_workbook_row_limit: '名单数据行数超过技术限制',
  roster_workbook_no_data: '名单工作簿没有数据行',
  roster_workbook_invalid_sequence: '名单序号必须是正整数',
  roster_workbook_sequence_limit: '名单序号超过技术安全上限',
  roster_workbook_duplicate_sequence: '名单序号不能重复',
  roster_workbook_identity_card_not_supported: '当前名单导入不支持非空身份证号码',
  roster_workbook_invalid_date: '名单日期无效',
  roster_workbook_invalid_identifier: '名单证件号或电话无法安全转换为文本',
  roster_workbook_invalid_cell: '名单单元格值无效'
};

export class PassengerRosterWorkbookError extends Error {
  readonly code: PassengerRosterWorkbookErrorCode;
  readonly row?: number;
  readonly column?: number;
  readonly conversionErrorCode?: DocumentConversionErrorCode;

  constructor(
    code: PassengerRosterWorkbookErrorCode,
    location: { row?: number; column?: number; conversionErrorCode?: DocumentConversionErrorCode } = {}
  ) {
    super(ERROR_MESSAGES[code]);
    this.name = 'PassengerRosterWorkbookError';
    this.code = code;
    this.row = location.row;
    this.column = location.column;
    this.conversionErrorCode = location.conversionErrorCode;
  }
}

export interface PassengerRosterWorkbookInput {
  content: Buffer;
  fileName: string;
  contentType: string;
}

/**
 * The caller must run legacy conversion in an isolated, macro-disabled
 * process and must reject converter fallback to the original source bytes.
 * This normalizer independently verifies that the callback returned XLSX.
 */
export type LegacyXlsConverter = (input: PassengerRosterWorkbookInput) => Promise<Buffer>;

export interface PassengerRosterWorkbookOptions {
  convertLegacyXls?: LegacyXlsConverter;
  maxInputBytes?: number;
  maxUncompressedBytes?: number;
  maxArchiveEntries?: number;
  maxDataRows?: number;
}

export interface NormalizedPassengerRosterWorkbook {
  canonicalTsv: string;
  rowCount: number;
  sourceFormat: 'xls' | 'xlsx';
  worksheetName: string;
  headerRow: number;
}

type ScalarCellValue = string | number | boolean | Date | null;

function fail(
  code: PassengerRosterWorkbookErrorCode,
  location: { row?: number; column?: number; conversionErrorCode?: DocumentConversionErrorCode } = {}
): never {
  throw new PassengerRosterWorkbookError(code, location);
}

function startsWithMagic(content: Buffer, magic: Buffer): boolean {
  return content.byteLength >= magic.byteLength
    && content.subarray(0, magic.byteLength).equals(magic);
}

function normalizedMimeType(contentType: string): string {
  return contentType.toLowerCase().split(';', 1)[0].trim();
}

function sourceFormat(input: PassengerRosterWorkbookInput): 'xls' | 'xlsx' {
  const extension = extname(input.fileName).toLowerCase();
  const mimeType = normalizedMimeType(input.contentType);
  const xlsxMagic = startsWithMagic(input.content, XLSX_MAGIC);
  const xlsMagic = startsWithMagic(input.content, XLS_MAGIC);
  const genericMime = mimeType === ''
    || mimeType === 'application/octet-stream'
    || mimeType === 'application/zip';
  const xlsxMime = mimeType === 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
  const xlsMime = [
    'application/vnd.ms-excel',
    'application/msexcel',
    'application/x-msexcel',
    'application/xls',
    'application/vnd.ms-office'
  ].includes(mimeType);

  if (extension !== '.xls' && extension !== '.xlsx') {
    fail('roster_workbook_unsupported_format');
  }
  if (extension === '.xlsx') {
    if (!xlsxMagic || xlsMagic || (!genericMime && !xlsxMime)) {
      fail('roster_workbook_format_mismatch');
    }
    return 'xlsx';
  }
  if (!xlsMagic || xlsxMagic || (!genericMime && !xlsMime)) {
    fail('roster_workbook_format_mismatch');
  }
  return 'xls';
}

function legacyWorkbookHasMacroMarkers(content: Buffer): boolean {
  const markers = ['_VBA_PROJECT_CUR', 'PROJECTwm', 'VBA/dir', 'VBA\\dir', 'Macros'];
  return markers.some((marker) => (
    content.indexOf(Buffer.from(marker, 'latin1')) >= 0
      || content.indexOf(Buffer.from(marker, 'utf16le')) >= 0
  ));
}

const UNSAFE_ARCHIVE_PATH = /(?:^|\/)(?:vbaProject\.bin|macrosheets\/|activex\/|embeddings\/|externalLinks\/|connections\.xml$|queryTables\/|webextensions\/|model\/)/i;
const RELATIONSHIP_OR_CONTENT_TYPE_PATH = /(?:\.rels|\[Content_Types\]\.xml)$/i;
const EXTERNAL_RELATIONSHIP_PATTERN = /\bTargetMode\s*=\s*["']External["']/i;
const MACRO_CONTENT_TYPE_PATTERN = /(?:macroEnabled|vbaProject|activeX|oleObject)/i;

async function readArchiveEntryText(zipFile: ZipFile, entry: Entry): Promise<string> {
  const stream = await zipFile.openReadStreamPromise(entry);
  const chunks: Buffer[] = [];
  for await (const chunk of stream) {
    chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
  }
  return Buffer.concat(chunks).toString('utf8');
}

async function inspectXlsxArchive(
  content: Buffer,
  options: Required<Pick<PassengerRosterWorkbookOptions, 'maxUncompressedBytes' | 'maxArchiveEntries'>>
): Promise<void> {
  let zipFile: ZipFile;
  try {
    zipFile = await fromBufferPromise(content, {
      lazyEntries: true,
      decodeStrings: true,
      validateEntrySizes: true,
      strictFileNames: true
    });
  } catch {
    fail('roster_workbook_invalid_xlsx');
  }

  let entryCount = 0;
  let uncompressedBytes = 0;
  try {
    for await (const entry of zipFile.eachEntry()) {
      entryCount += 1;
      uncompressedBytes += entry.uncompressedSize;
      if (
        entryCount > options.maxArchiveEntries
        || entry.uncompressedSize > options.maxUncompressedBytes
        || uncompressedBytes > options.maxUncompressedBytes
      ) {
        fail('roster_workbook_archive_limit');
      }
      if (entry.isEncrypted() || !entry.canDecodeFileData()) {
        fail('roster_workbook_unsafe_content');
      }
      const normalizedPath = entry.fileName.replace(/\\/g, '/');
      if (UNSAFE_ARCHIVE_PATH.test(normalizedPath)) {
        fail('roster_workbook_unsafe_content');
      }
      if (RELATIONSHIP_OR_CONTENT_TYPE_PATH.test(normalizedPath) && entry.uncompressedSize > 0) {
        const source = await readArchiveEntryText(zipFile, entry);
        if (
          EXTERNAL_RELATIONSHIP_PATTERN.test(source)
          || (normalizedPath.endsWith('[Content_Types].xml') && MACRO_CONTENT_TYPE_PATTERN.test(source))
        ) {
          fail('roster_workbook_unsafe_content');
        }
      }
    }
  } catch (error) {
    if (error instanceof PassengerRosterWorkbookError) throw error;
    fail('roster_workbook_invalid_xlsx');
  } finally {
    zipFile.close();
  }
}

function formulaText(cell: ExcelJS.Cell): string | undefined {
  if (cell.type !== ExcelJS.ValueType.Formula) return undefined;
  const formula = cell.formula;
  return typeof formula === 'string' ? formula : undefined;
}

function containsExternalFormulaReference(formula: string): boolean {
  return /(?:\[[^\]]+\]|https?:|ftp:|file:|\\\\|WEBSERVICE\s*\(|HYPERLINK\s*\(|DDE\s*\()/i.test(formula);
}

function normalizedFormula(formula: string): string {
  return formula
    .replace(/^=/, '')
    .replace(/\$/g, '')
    .replace(/;/g, ',')
    .replace(/\s+/g, '')
    .toUpperCase();
}

function cellRow(cell: ExcelJS.Cell): number {
  return cell.fullAddress.row;
}

function cellColumn(cell: ExcelJS.Cell): number {
  return cell.fullAddress.col;
}

function formulaAllowed(cell: ExcelJS.Cell, headerRow: number): boolean {
  const row = cellRow(cell);
  const column = cellColumn(cell);
  if (row <= headerRow) return false;
  const formula = normalizedFormula(cell.formula);
  if (column === 7) {
    return formula === `DATEDIF(F${row},TODAY(),"Y")`;
  }
  if (column === 12) {
    return formula === `EDATE(K${row},10*12)-1`;
  }
  return false;
}

function scalarValue(cell: ExcelJS.Cell, allowFormulaResult = false): ScalarCellValue {
  if (cell.type === ExcelJS.ValueType.Formula) {
    if (!allowFormulaResult) fail('roster_workbook_formula_not_allowed', { row: cellRow(cell), column: cellColumn(cell) });
    const result = cell.result;
    if (result === undefined || result === null) {
      fail('roster_workbook_formula_result_missing', { row: cellRow(cell), column: cellColumn(cell) });
    }
    if (typeof result === 'object' && !(result instanceof Date)) {
      fail('roster_workbook_invalid_cell', { row: cellRow(cell), column: cellColumn(cell) });
    }
    return result;
  }

  const value = cell.value;
  if (value === undefined || value === null) return null;
  if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean' || value instanceof Date) {
    return value;
  }
  if ('hyperlink' in value) {
    fail('roster_workbook_unsafe_content', { row: cellRow(cell), column: cellColumn(cell) });
  }
  if ('richText' in value) {
    return value.richText.map((part) => part.text).join('');
  }
  fail('roster_workbook_invalid_cell', { row: cellRow(cell), column: cellColumn(cell) });
}

function normalizedText(value: ScalarCellValue): string {
  if (value === null) return '';
  if (value instanceof Date) return value.toISOString();
  return String(value)
    .replace(/[\t\r\n\u3000]+/g, ' ')
    .replace(/[\u0000-\u0008\u000b\u000c\u000e-\u001f\u007f]/g, '')
    .replace(/\s+/g, ' ')
    .trim();
}

function headerText(cell: ExcelJS.Cell): string {
  if (cell.type === ExcelJS.ValueType.Formula) return '';
  return normalizedText(scalarValue(cell));
}

function cellHasData(cell: ExcelJS.Cell): boolean {
  if (cell.type === ExcelJS.ValueType.Formula) return true;
  return normalizedText(scalarValue(cell)) !== '';
}

function rowHasData(row: ExcelJS.Row, maxColumn = SOURCE_COLUMN_COUNT): boolean {
  for (let column = 1; column <= maxColumn; column += 1) {
    if (cellHasData(row.getCell(column))) return true;
  }
  return false;
}

function validateFormulasAndHiddenData(sheet: ExcelJS.Worksheet, headerRow: number): void {
  sheet.eachRow({ includeEmpty: false }, (row, rowNumber) => {
    let hasData = false;
    row.eachCell({ includeEmpty: false }, (cell, columnNumber) => {
      if (cell.type === ExcelJS.ValueType.Merge && cell.master.address !== cell.address) return;
      const formula = formulaText(cell);
      if (formula) {
        if (containsExternalFormulaReference(formula)) {
          fail('roster_workbook_unsafe_content', { row: rowNumber, column: columnNumber });
        }
        if (!formulaAllowed(cell, headerRow)) {
          fail('roster_workbook_formula_not_allowed', { row: rowNumber, column: columnNumber });
        }
      }
      if (cell.type === ExcelJS.ValueType.Hyperlink || cell.isHyperlink) {
        fail('roster_workbook_unsafe_content', { row: rowNumber, column: columnNumber });
      }
      if (cellHasData(cell)) hasData = true;
      if (columnNumber > SOURCE_COLUMN_COUNT && rowNumber >= headerRow) {
        fail('roster_workbook_unexpected_column', { row: rowNumber, column: columnNumber });
      }
    });
    if (row.hidden && hasData) fail('roster_workbook_hidden_data', { row: rowNumber });
  });

  for (let columnNumber = 1; columnNumber <= sheet.columnCount; columnNumber += 1) {
    const column = sheet.getColumn(columnNumber);
    if (!column.hidden) continue;
    let hasData = false;
    column.eachCell({ includeEmpty: false }, (cell) => {
      if (cellHasData(cell)) hasData = true;
    });
    if (hasData) fail('roster_workbook_hidden_data', { column: columnNumber });
  }
}

function findHeaderRow(sheet: ExcelJS.Worksheet): number {
  const candidates: number[] = [];
  const lastCandidate = Math.min(sheet.rowCount, MAX_HEADER_ROW);
  for (let rowNumber = 1; rowNumber <= lastCandidate; rowNumber += 1) {
    const row = sheet.getRow(rowNumber);
    const values = SOURCE_HEADERS.map((_header, index) => headerText(row.getCell(index + 1)));
    if (values.every((value, index) => value === SOURCE_HEADERS[index])) {
      candidates.push(rowNumber);
    }
  }
  if (candidates.length === 0) fail('roster_workbook_header_not_found');
  if (candidates.length !== 1) fail('roster_workbook_ambiguous_header');
  if (candidates[0] !== EXPECTED_HEADER_ROW) {
    fail('roster_workbook_header_row_invalid', { row: candidates[0] });
  }
  return candidates[0];
}

function excelSerialToDate(value: number, date1904: boolean): Date | undefined {
  if (!Number.isFinite(value) || value < 0) return undefined;
  const millisecondsPerDay = 86_400_000;
  const epoch = date1904
    ? Date.UTC(1904, 0, 1)
    : Date.UTC(1899, 11, 30);
  const result = new Date(epoch + Math.floor(value) * millisecondsPerDay);
  return Number.isNaN(result.getTime()) ? undefined : result;
}

function canonicalDate(cell: ExcelJS.Cell, date1904: boolean, formulaResult = false): string {
  const value = scalarValue(cell, formulaResult);
  if (value === null || value === '') return '';
  let date: Date | undefined;
  if (value instanceof Date) {
    date = value;
  } else if (typeof value === 'number') {
    date = excelSerialToDate(value, date1904);
  } else if (typeof value === 'string') {
    const match = value.trim().match(/^(\d{4})[-/.\u5e74](\d{1,2})[-/.\u6708](\d{1,2})(?:\u65e5)?$/);
    if (match) {
      date = new Date(Date.UTC(Number(match[1]), Number(match[2]) - 1, Number(match[3])));
      if (
        date.getUTCFullYear() !== Number(match[1])
        || date.getUTCMonth() !== Number(match[2]) - 1
        || date.getUTCDate() !== Number(match[3])
      ) {
        date = undefined;
      }
    }
  }
  if (!date || Number.isNaN(date.getTime())) {
    fail('roster_workbook_invalid_date', { row: cellRow(cell), column: cellColumn(cell) });
  }
  const year = date.getUTCFullYear();
  if (year < 1900 || year > 2200) {
    fail('roster_workbook_invalid_date', { row: cellRow(cell), column: cellColumn(cell) });
  }
  return `${String(year).padStart(4, '0')}-${String(date.getUTCMonth() + 1).padStart(2, '0')}-${String(date.getUTCDate()).padStart(2, '0')}`;
}

function canonicalIdentifier(cell: ExcelJS.Cell): string {
  const value = scalarValue(cell);
  if (value === null || value === '') return '';
  if (typeof value === 'number') {
    if (!Number.isSafeInteger(value) || value < 0) {
      fail('roster_workbook_invalid_identifier', { row: cellRow(cell), column: cellColumn(cell) });
    }
    return String(value);
  }
  if (typeof value !== 'string') {
    fail('roster_workbook_invalid_identifier', { row: cellRow(cell), column: cellColumn(cell) });
  }
  return normalizedText(value);
}

function canonicalSequence(cell: ExcelJS.Cell): number {
  const value = scalarValue(cell);
  let sequence: number;
  if (typeof value === 'number') {
    sequence = value;
  } else if (typeof value === 'string' && /^[1-9]\d*$/.test(value.trim())) {
    sequence = Number(value.trim());
  } else {
    fail('roster_workbook_invalid_sequence', { row: cellRow(cell), column: cellColumn(cell) });
  }
  if (!Number.isSafeInteger(sequence) || sequence <= 0) {
    fail('roster_workbook_invalid_sequence', { row: cellRow(cell), column: cellColumn(cell) });
  }
  if (sequence > MAX_PASSENGER_SEQUENCE) {
    fail('roster_workbook_sequence_limit', { row: cellRow(cell), column: cellColumn(cell) });
  }
  return sequence;
}

function canonicalTextCell(cell: ExcelJS.Cell): string {
  return normalizedText(scalarValue(cell));
}

function dataRows(sheet: ExcelJS.Worksheet, headerRow: number, maxDataRows: number): ExcelJS.Row[] {
  const rows: ExcelJS.Row[] = [];
  let gapAfterData = false;
  for (let rowNumber = headerRow + 1; rowNumber <= sheet.rowCount; rowNumber += 1) {
    const row = sheet.getRow(rowNumber);
    const hasData = rowHasData(row);
    if (!hasData) {
      if (rows.length > 0) gapAfterData = true;
      continue;
    }
    if (gapAfterData) fail('roster_workbook_non_contiguous_rows', { row: rowNumber });
    rows.push(row);
    if (rows.length > maxDataRows) fail('roster_workbook_row_limit');
  }
  if (rows.length === 0) fail('roster_workbook_no_data');
  return rows;
}

function canonicalRow(row: ExcelJS.Row, date1904: boolean, seenSequences: Set<number>): string[] {
  const sequence = canonicalSequence(row.getCell(1));
  if (seenSequences.has(sequence)) {
    fail('roster_workbook_duplicate_sequence', { row: row.number, column: 1 });
  }
  seenSequences.add(sequence);

  if (canonicalIdentifier(row.getCell(5)) !== '') {
    fail('roster_workbook_identity_card_not_supported', { row: row.number, column: 5 });
  }

  const englishName = canonicalTextCell(row.getCell(3)).replace(/，/g, ',');
  return [
    String(sequence),
    canonicalTextCell(row.getCell(2)),
    englishName,
    canonicalTextCell(row.getCell(4)),
    canonicalDate(row.getCell(6), date1904),
    canonicalTextCell(row.getCell(8)),
    '护照',
    canonicalIdentifier(row.getCell(9)),
    canonicalTextCell(row.getCell(10)),
    canonicalDate(row.getCell(11), date1904),
    canonicalDate(row.getCell(12), date1904, row.getCell(12).type === ExcelJS.ValueType.Formula),
    canonicalIdentifier(row.getCell(13)),
    canonicalTextCell(row.getCell(14))
  ];
}

export async function normalizePassengerRosterWorkbook(
  input: PassengerRosterWorkbookInput,
  options: PassengerRosterWorkbookOptions = {}
): Promise<NormalizedPassengerRosterWorkbook> {
  const maxInputBytes = options.maxInputBytes ?? DEFAULT_MAX_INPUT_BYTES;
  const maxUncompressedBytes = options.maxUncompressedBytes ?? DEFAULT_MAX_UNCOMPRESSED_BYTES;
  const maxArchiveEntries = options.maxArchiveEntries ?? DEFAULT_MAX_ARCHIVE_ENTRIES;
  const requestedMaxDataRows = options.maxDataRows ?? DEFAULT_MAX_DATA_ROWS;
  const maxDataRows = Math.min(requestedMaxDataRows, ABSOLUTE_MAX_DATA_ROWS);

  if (!Number.isSafeInteger(maxInputBytes) || maxInputBytes <= 0) fail('roster_workbook_too_large');
  if (!Number.isSafeInteger(maxUncompressedBytes) || maxUncompressedBytes <= 0) fail('roster_workbook_archive_limit');
  if (!Number.isSafeInteger(maxArchiveEntries) || maxArchiveEntries <= 0) fail('roster_workbook_archive_limit');
  if (!Number.isSafeInteger(requestedMaxDataRows) || requestedMaxDataRows <= 0) fail('roster_workbook_row_limit');
  if (input.content.byteLength === 0) fail('roster_workbook_empty');
  if (input.content.byteLength > maxInputBytes) fail('roster_workbook_too_large');

  const format = sourceFormat(input);
  let xlsxContent = input.content;
  if (format === 'xls') {
    if (legacyWorkbookHasMacroMarkers(input.content)) fail('roster_workbook_unsafe_content');
    if (!options.convertLegacyXls) fail('roster_workbook_converter_unavailable');
    try {
      xlsxContent = await options.convertLegacyXls(input);
    } catch (error) {
      if (error instanceof PassengerRosterWorkbookError) throw error;
      fail('roster_workbook_conversion_failed');
    }
    if (
      !Buffer.isBuffer(xlsxContent)
      || xlsxContent.byteLength === 0
      || xlsxContent.byteLength > maxInputBytes
      || !startsWithMagic(xlsxContent, XLSX_MAGIC)
    ) {
      fail('roster_workbook_conversion_failed');
    }
  }

  await inspectXlsxArchive(xlsxContent, { maxUncompressedBytes, maxArchiveEntries });
  const workbook = new ExcelJS.Workbook();
  try {
    const excelJsBuffer = xlsxContent as unknown as Parameters<typeof workbook.xlsx.load>[0];
    await workbook.xlsx.load(excelJsBuffer);
  } catch {
    fail('roster_workbook_invalid_xlsx');
  }
  if (workbook.worksheets.length !== 1) fail('roster_workbook_ambiguous_sheet');
  const sheet = workbook.worksheets[0];
  if (sheet.state !== 'visible') fail('roster_workbook_hidden_data');
  const headerRow = findHeaderRow(sheet);
  validateFormulasAndHiddenData(sheet, headerRow);
  const rows = dataRows(sheet, headerRow, maxDataRows);
  const date1904 = workbook.properties.date1904 === true;
  const seenSequences = new Set<number>();
  const canonicalRows = rows.map((row) => canonicalRow(row, date1904, seenSequences));
  return {
    canonicalTsv: [CANONICAL_PASSENGER_HEADERS, ...canonicalRows]
      .map((row) => row.join('\t'))
      .join('\n'),
    rowCount: canonicalRows.length,
    sourceFormat: format,
    worksheetName: sheet.name,
    headerRow
  };
}