import path from 'path';
import { parseDocument } from './crud';

describe('Document Parser', () => {
  test('parseDocument() parses text from docx', async () => {
    const file = {
      originalname: 'sample.docx',
      path: path.join(__dirname, 'sample.docx'),
      mimetype: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
    } as Express.Multer.File;

    const document = await parseDocument({ file });

    expect(document).toEqual({
      bytes: 29,
      filename: 'sample.docx',
      filepath: 'document_parser',
      images: [],
      text: 'This is a sample DOCX file.\n\n',
    });
  });

  test('parseDocument() parses text from xlsx', async () => {
    const file = {
      originalname: 'sample.xlsx',
      path: path.join(__dirname, 'sample.xlsx'),
      mimetype: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
    } as Express.Multer.File;

    const document = await parseDocument({ file });

    expect(document).toEqual({
      bytes: 66,
      filename: 'sample.xlsx',
      filepath: 'document_parser',
      images: [],
      text: 'Sheet One:\nData,on,first,sheet\nSecond Sheet:\nData,On\nSecond,Sheet\n',
    });
  });

  test('parseDocument() parses text from xls', async () => {
    const file = {
      originalname: 'sample.xls',
      path: path.join(__dirname, 'sample.xls'),
      mimetype: 'application/vnd.ms-excel',
    } as Express.Multer.File;

    const document = await parseDocument({ file });

    expect(document).toEqual({
      bytes: 31,
      filename: 'sample.xls',
      filepath: 'document_parser',
      images: [],
      text: 'Sheet One:\nData,on,first,sheet\n',
    });
  });

  test('parseDocument() parses text from ods', async () => {
    const file = {
      originalname: 'sample.ods',
      path: path.join(__dirname, 'sample.ods'),
      mimetype: 'application/vnd.oasis.opendocument.spreadsheet',
    } as Express.Multer.File;

    const document = await parseDocument({ file });

    expect(document).toEqual({
      bytes: 66,
      filename: 'sample.ods',
      filepath: 'document_parser',
      images: [],
      text: 'Sheet One:\nData,on,first,sheet\nSecond Sheet:\nData,On\nSecond,Sheet\n',
    });
  });

  test.each([
    'application/msexcel',
    'application/x-msexcel',
    'application/x-ms-excel',
    'application/x-excel',
    'application/x-dos_ms_excel',
    'application/xls',
    'application/x-xls',
  ])('parseDocument() parses xls with variant MIME type: %s', async (mimetype) => {
    const file = {
      originalname: 'sample.xls',
      path: path.join(__dirname, 'sample.xls'),
      mimetype,
    } as Express.Multer.File;

    const document = await parseDocument({ file });

    expect(document).toEqual({
      bytes: 31,
      filename: 'sample.xls',
      filepath: 'document_parser',
      images: [],
      text: 'Sheet One:\nData,on,first,sheet\n',
    });
  });

  test('parseDocument() throws error for unhandled document type', async () => {
    const file = {
      originalname: 'nonexistent.file',
      path: path.join(__dirname, 'nonexistent.file'),
      mimetype: 'application/invalid',
    } as Express.Multer.File;

    await expect(parseDocument({ file })).rejects.toThrow(
      'Unsupported file type in document parser: application/invalid',
    );
  });

  test('parseDocument() throws error for empty document', async () => {
    const file = {
      originalname: 'empty.docx',
      path: path.join(__dirname, 'empty.docx'),
      mimetype: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
    } as Express.Multer.File;

    await expect(parseDocument({ file })).rejects.toThrow('No text found in document');
  });

  test('parseDocument() rejects files exceeding the pre-parse size limit', async () => {
    const file = {
      originalname: 'oversized.docx',
      path: path.join(__dirname, 'sample.docx'),
      mimetype: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
      size: 16 * 1024 * 1024,
    } as Express.Multer.File;

    await expect(parseDocument({ file })).rejects.toThrow(
      /exceeds the 15MB document parser limit \(16MB\)/,
    );
  });

  test('parseDocument() allows files exactly at the size limit boundary', async () => {
    const file = {
      originalname: 'sample.docx',
      path: path.join(__dirname, 'sample.docx'),
      mimetype: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
      size: 15 * 1024 * 1024,
    } as Express.Multer.File;

    await expect(parseDocument({ file })).resolves.toBeDefined();
  });

  test('parseDocument() parses empty xlsx with only sheet name', async () => {
    const file = {
      originalname: 'empty.xlsx',
      path: path.join(__dirname, 'empty.xlsx'),
      mimetype: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
    } as Express.Multer.File;

    const document = await parseDocument({ file });

    expect(document).toEqual({
      bytes: 8,
      filename: 'empty.xlsx',
      filepath: 'document_parser',
      images: [],
      text: 'Empty:\n\n',
    });
  });

  test('xlsx exports read and utils as named imports', async () => {
    const { read, utils } = await import('xlsx');
    expect(typeof read).toBe('function');
    expect(typeof utils?.sheet_to_csv).toBe('function');
  });
});