import { tap, expect } from '@git.zone/tstest/tapbundle';
import * as skr from '../ts/index.js';

let api: skr.SkrApi;

tap.test('should initialize SKR04 API', async () => {
  api = new skr.SkrApi({
    mongoDbUrl: 'mongodb://localhost:27017',
    dbName: 'test_skr04',
  });

  await api.initialize('SKR04');
  expect(api.getSKRType()).toEqual('SKR04');
});

tap.test('should have SKR04 accounts initialized', async () => {
  const accounts = await api.listAccounts();
  expect(accounts.length).toBeGreaterThan(50);

  // Check specific SKR04 accounts exist
  const kasse = await api.getAccount('1000');
  expect(kasse).not.toBeNull();
  expect(kasse.accountName).toEqual('Kasse');
  expect(kasse.accountType).toEqual('asset');

  const umsatz = await api.getAccount('4000');
  expect(umsatz).not.toBeNull();
  expect(umsatz.accountName).toEqual('Umsatzerlöse');
  expect(umsatz.accountType).toEqual('revenue');
});

tap.test('should verify SKR04 financial classification principle', async () => {
  // SKR04 organizes accounts by financial statement structure
  // Class 2: Expenses Part 1
  // Class 3: Expenses Part 2
  // Class 4: Revenues Part 1
  // Class 5: Revenues Part 2

  const class2 = await api.getAccountsByClass(2);
  expect(class2.length).toBeGreaterThan(0);
  expect(class2[0].accountType).toEqual('expense');

  const class3 = await api.getAccountsByClass(3);
  expect(class3.length).toBeGreaterThan(0);
  expect(class3[0].accountType).toEqual('expense');

  const class4 = await api.getAccountsByClass(4);
  expect(class4.length).toBeGreaterThan(0);
  expect(class4[0].accountType).toEqual('revenue');

  const class5 = await api.getAccountsByClass(5);
  expect(class5.length).toBeGreaterThan(0);
  expect(class5[0].accountType).toEqual('revenue');
});

tap.test('should handle Class 8 as free for use in SKR04', async () => {
  // Class 8 in SKR04 is reserved for custom use
  const class8 = await api.getAccountsByClass(8);

  for (const account of class8) {
    expect(account.accountName).toEqual('frei');
    expect(account.description).toInclude('custom use');
  }
});

tap.test('should post complex transaction in SKR04', async () => {
  const transaction = await api.postTransaction({
    date: new Date(),
    debitAccount: '5400', // Goods with 19% VAT
    creditAccount: '1600', // Trade payables
    amount: 119,
    description: 'Purchase with VAT',
    reference: 'BILL-001',
    skrType: 'SKR04',
    vatAmount: 19,
  });

  expect(transaction.status).toEqual('posted');
  expect(transaction.vatAmount).toEqual(19);
  expect(transaction.skrType).toEqual('SKR04');
});

tap.test('should reverse transaction in SKR04', async () => {
  // First create a transaction
  const originalTransaction = await api.postTransaction({
    date: new Date(),
    debitAccount: '3000', // Rent expense
    creditAccount: '1200', // Bank
    amount: 500,
    description: 'Rent payment',
    reference: 'RENT-001',
    skrType: 'SKR04',
  });

  // Then reverse it
  const reversalTransaction = await api.reverseTransaction(
    originalTransaction.id,
  );

  expect(reversalTransaction.reversalOf).toEqual(originalTransaction.id);
  expect(reversalTransaction.debitAccount).toEqual(
    originalTransaction.creditAccount,
  );
  expect(reversalTransaction.creditAccount).toEqual(
    originalTransaction.debitAccount,
  );
  expect(reversalTransaction.amount).toEqual(originalTransaction.amount);
});

tap.test('should calculate correct balances in SKR04', async () => {
  // Post several transactions
  await api.postTransaction({
    date: new Date(),
    debitAccount: '1200', // Bank
    creditAccount: '4300', // Revenue 19% VAT
    amount: 1190,
    description: 'Sale with VAT',
    skrType: 'SKR04',
    vatAmount: 190,
  });

  await api.postTransaction({
    date: new Date(),
    debitAccount: '2300', // Wages expense
    creditAccount: '1200', // Bank
    amount: 3000,
    description: 'Salary payment',
    skrType: 'SKR04',
  });

  // Check bank account balance
  const bankBalance = await api.getAccountBalance('1200');
  expect(bankBalance.accountNumber).toEqual('1200');
  expect(bankBalance.balance).toEqual(
    bankBalance.debitTotal - bankBalance.creditTotal,
  );
});

tap.test('should export trial balance to CSV for SKR04', async () => {
  const csv = await api.exportReportToCSV('trial_balance');

  expect(csv).toInclude(
    '"Account Number";"Account Name";"Debit";"Credit";"Balance"',
  );
  expect(csv).toInclude('TOTAL');
});

tap.test('should handle pagination for SKR04 accounts', async () => {
  const page1 = await api.getAccountsPaginated(1, 10);

  expect(page1.data.length).toBeLessThanOrEqual(10);
  expect(page1.page).toEqual(1);
  expect(page1.pageSize).toEqual(10);
  expect(page1.total).toBeGreaterThan(50);
  expect(page1.totalPages).toBeGreaterThan(5);

  // Get second page
  const page2 = await api.getAccountsPaginated(2, 10);
  expect(page2.data[0].accountNumber).not.toEqual(page1.data[0].accountNumber);
});

tap.test('should validate double-entry rules', async () => {
  const isValid1 = api.validateDoubleEntry(100, 100);
  expect(isValid1).toBeTrue();

  const isValid2 = api.validateDoubleEntry(100, 99);
  expect(isValid2).toBeFalse();

  const isValid3 = api.validateDoubleEntry(100.0, 100.001);
  expect(isValid3).toBeTrue(); // Small rounding differences are acceptable
});

tap.test('should generate DATEV export for SKR04', async () => {
  const datevExport = await api.exportToDATEV();

  expect(datevExport).toInclude('EXTF');
  expect(datevExport).toInclude('Buchungsstapel');
});

tap.test('should close API connection', async () => {
  await api.close();

  // Verify API requires reinitialization
  let errorThrown = false;
  try {
    await api.listAccounts();
  } catch (error) {
    errorThrown = true;
    expect(error.message).toInclude('not initialized');
  }
  expect(errorThrown).toBeTrue();
});

export default tap.start();