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

const {
  calculateCRC32,
  calculateCRC32Buffer,
  calculateDocumentChecksum,
  addChecksum,
  verifyChecksum,
  removeChecksum,
} = smartmongo.tsmdb;

// ============================================================================
// CRC32 String Tests
// ============================================================================

tap.test('checksum: calculateCRC32 should return consistent value for same input', async () => {
  const result1 = calculateCRC32('hello world');
  const result2 = calculateCRC32('hello world');
  expect(result1).toEqual(result2);
});

tap.test('checksum: calculateCRC32 should return different values for different inputs', async () => {
  const result1 = calculateCRC32('hello');
  const result2 = calculateCRC32('world');
  expect(result1).not.toEqual(result2);
});

tap.test('checksum: calculateCRC32 should return a 32-bit unsigned integer', async () => {
  const result = calculateCRC32('test string');
  expect(result).toBeGreaterThanOrEqual(0);
  expect(result).toBeLessThanOrEqual(0xFFFFFFFF);
});

tap.test('checksum: calculateCRC32 should handle empty string', async () => {
  const result = calculateCRC32('');
  expect(typeof result).toEqual('number');
  expect(result).toBeGreaterThanOrEqual(0);
});

tap.test('checksum: calculateCRC32 should handle special characters', async () => {
  const result = calculateCRC32('hello\nworld\t!"#$%&\'()');
  expect(typeof result).toEqual('number');
  expect(result).toBeGreaterThanOrEqual(0);
});

tap.test('checksum: calculateCRC32 should handle unicode characters', async () => {
  const result = calculateCRC32('hello 世界 🌍');
  expect(typeof result).toEqual('number');
  expect(result).toBeGreaterThanOrEqual(0);
});

// ============================================================================
// CRC32 Buffer Tests
// ============================================================================

tap.test('checksum: calculateCRC32Buffer should return consistent value for same input', async () => {
  const buffer = Buffer.from('hello world');
  const result1 = calculateCRC32Buffer(buffer);
  const result2 = calculateCRC32Buffer(buffer);
  expect(result1).toEqual(result2);
});

tap.test('checksum: calculateCRC32Buffer should return different values for different inputs', async () => {
  const buffer1 = Buffer.from('hello');
  const buffer2 = Buffer.from('world');
  const result1 = calculateCRC32Buffer(buffer1);
  const result2 = calculateCRC32Buffer(buffer2);
  expect(result1).not.toEqual(result2);
});

tap.test('checksum: calculateCRC32Buffer should handle empty buffer', async () => {
  const result = calculateCRC32Buffer(Buffer.from(''));
  expect(typeof result).toEqual('number');
  expect(result).toBeGreaterThanOrEqual(0);
});

tap.test('checksum: calculateCRC32Buffer should handle binary data', async () => {
  const buffer = Buffer.from([0x00, 0xFF, 0x7F, 0x80, 0x01]);
  const result = calculateCRC32Buffer(buffer);
  expect(typeof result).toEqual('number');
  expect(result).toBeGreaterThanOrEqual(0);
});

// ============================================================================
// Document Checksum Tests
// ============================================================================

tap.test('checksum: calculateDocumentChecksum should return consistent value', async () => {
  const doc = { name: 'John', age: 30 };
  const result1 = calculateDocumentChecksum(doc);
  const result2 = calculateDocumentChecksum(doc);
  expect(result1).toEqual(result2);
});

tap.test('checksum: calculateDocumentChecksum should exclude _checksum field', async () => {
  const doc1 = { name: 'John', age: 30 };
  const doc2 = { name: 'John', age: 30, _checksum: 12345 };
  const result1 = calculateDocumentChecksum(doc1);
  const result2 = calculateDocumentChecksum(doc2);
  expect(result1).toEqual(result2);
});

tap.test('checksum: calculateDocumentChecksum should handle empty document', async () => {
  const result = calculateDocumentChecksum({});
  expect(typeof result).toEqual('number');
  expect(result).toBeGreaterThanOrEqual(0);
});

tap.test('checksum: calculateDocumentChecksum should handle nested objects', async () => {
  const doc = {
    name: 'John',
    address: {
      street: '123 Main St',
      city: 'Springfield',
      zip: {
        code: '12345',
        plus4: '6789',
      },
    },
  };
  const result = calculateDocumentChecksum(doc);
  expect(typeof result).toEqual('number');
  expect(result).toBeGreaterThanOrEqual(0);
});

tap.test('checksum: calculateDocumentChecksum should handle arrays', async () => {
  const doc = {
    name: 'John',
    tags: ['developer', 'tester', 'admin'],
    scores: [95, 87, 92],
  };
  const result = calculateDocumentChecksum(doc);
  expect(typeof result).toEqual('number');
  expect(result).toBeGreaterThanOrEqual(0);
});

// ============================================================================
// Add/Verify/Remove Checksum Tests
// ============================================================================

tap.test('checksum: addChecksum should add _checksum field to document', async () => {
  const doc = { name: 'John', age: 30 };
  const docWithChecksum = addChecksum(doc);

  expect('_checksum' in docWithChecksum).toBeTrue();
  expect(typeof docWithChecksum._checksum).toEqual('number');
  expect(docWithChecksum.name).toEqual('John');
  expect(docWithChecksum.age).toEqual(30);
});

tap.test('checksum: addChecksum should not modify the original document', async () => {
  const doc = { name: 'John', age: 30 };
  addChecksum(doc);
  expect('_checksum' in doc).toBeFalse();
});

tap.test('checksum: verifyChecksum should return true for valid checksum', async () => {
  const doc = { name: 'John', age: 30 };
  const docWithChecksum = addChecksum(doc);
  const isValid = verifyChecksum(docWithChecksum);
  expect(isValid).toBeTrue();
});

tap.test('checksum: verifyChecksum should return false for tampered document', async () => {
  const doc = { name: 'John', age: 30 };
  const docWithChecksum = addChecksum(doc);

  // Tamper with the document
  docWithChecksum.age = 31;

  const isValid = verifyChecksum(docWithChecksum);
  expect(isValid).toBeFalse();
});

tap.test('checksum: verifyChecksum should return false for wrong checksum', async () => {
  const doc = { name: 'John', age: 30, _checksum: 12345 };
  const isValid = verifyChecksum(doc);
  expect(isValid).toBeFalse();
});

tap.test('checksum: verifyChecksum should return true for document without checksum', async () => {
  const doc = { name: 'John', age: 30 };
  const isValid = verifyChecksum(doc);
  expect(isValid).toBeTrue();
});

tap.test('checksum: removeChecksum should remove _checksum field', async () => {
  const doc = { name: 'John', age: 30 };
  const docWithChecksum = addChecksum(doc);
  const docWithoutChecksum = removeChecksum(docWithChecksum);

  expect('_checksum' in docWithoutChecksum).toBeFalse();
  expect(docWithoutChecksum.name).toEqual('John');
  expect(docWithoutChecksum.age).toEqual(30);
});

tap.test('checksum: removeChecksum should handle document without checksum', async () => {
  const doc = { name: 'John', age: 30 };
  const result = removeChecksum(doc);

  expect('_checksum' in result).toBeFalse();
  expect(result.name).toEqual('John');
  expect(result.age).toEqual(30);
});

// ============================================================================
// Round-trip Tests
// ============================================================================

tap.test('checksum: full round-trip - add, verify, remove', async () => {
  const original = { name: 'Test', value: 42, nested: { a: 1, b: 2 } };

  // Add checksum
  const withChecksum = addChecksum(original);
  expect('_checksum' in withChecksum).toBeTrue();

  // Verify checksum
  expect(verifyChecksum(withChecksum)).toBeTrue();

  // Remove checksum
  const restored = removeChecksum(withChecksum);
  expect('_checksum' in restored).toBeFalse();

  // Original data should be intact
  expect(restored.name).toEqual('Test');
  expect(restored.value).toEqual(42);
  expect(restored.nested.a).toEqual(1);
  expect(restored.nested.b).toEqual(2);
});

export default tap.start();