import { describe, expect, test } from 'bun:test';
import { buildLogFilter, decodeTransferLogs, TRANSFER_TOPIC } from './onchain';

const WALLET = '0x5be9a4959308a0d0c7bc0870e319314d8d957dbb';

describe('buildLogFilter', () => {
  test('filtert auf Token-Whitelist + Transfer-Topic + Wallet als Empfänger', () => {
    const f = buildLogFilter(100, 200);
    expect(f.fromBlock).toBe('0x64');
    expect(f.toBlock).toBe('0xc8');
    expect(f.address).toContain('0x514910771af9ca656af840dff83e8264ecf986ca'); // LINK
    expect(f.topics[0]).toBe(TRANSFER_TOPIC);
    expect(f.topics[1]).toBeNull(); // from: beliebig
    expect(f.topics[2]).toContain('0x000000000000000000000000' + WALLET.slice(2));
  });
});

describe('decodeTransferLogs', () => {
  test('dekodiert Token, Menge (decimals-skaliert), Tx-Hash, Block', () => {
    const log = {
      address: '0x514910771af9ca656af840dff83e8264ecf986ca', // LINK, 18 decimals
      topics: [
        TRANSFER_TOPIC,
        '0x000000000000000000000000aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa',
        '0x000000000000000000000000' + WALLET.slice(2),
      ],
      data: '0x' + (5n * 10n ** 18n).toString(16).padStart(64, '0'), // 5 LINK
      transactionHash: '0xabc',
      blockNumber: '0x64',
    };
    const out = decodeTransferLogs([log]);
    expect(out).toHaveLength(1);
    expect(out[0]).toEqual({ symbol: 'LINK', instrument: 'LINK_USDT', amount: 5, txHash: '0xabc', blockNumber: 100 });
  });
  test('ignoriert Logs unbekannter Token-Contracts', () => {
    const log = {
      address: '0x000000000000000000000000000000000000dead',
      topics: [TRANSFER_TOPIC, '0x0', '0x0'],
      data: '0x1',
      transactionHash: '0xdef',
      blockNumber: '0x65',
    };
    expect(decodeTransferLogs([log])).toHaveLength(0);
  });
});