import 'package:flutter_test/flutter_test.dart';
import 'package:myapp/models/bank.dart';
import 'package:myapp/services/ing_csv_import.dart';

void main() {
  test('parses ING Dutch semicolon CSV with Af/Bij and YYYYMMDD', () {
    const raw = '''
"Datum";"Naam / Omschrijving";"Rekening";"Tegenrekening";"Code";"Af Bij";"Bedrag (EUR)";"Mutatiesoort";"Mededelingen"
"20260901";"AH CAMPUS DIEMEN";"NL00INGB0000000000";"";"GT";"Af";"12,50";"Betaalautomaat";"Pasvolgnr: 001"
"20260902";"SALARIS";"NL00INGB0000000000";"NL00ABCD";"OV";"Bij";"2000,00";"Overboeking";"Salaris september"
''';
    final txs = parseIngCsv(raw);
    expect(txs, hasLength(2));
    expect(txs[0].date, '2026-09-01');
    expect(txs[0].amount, -12.5);
    expect(txs[0].description, contains('AH CAMPUS'));
    expect(txs[1].date, '2026-09-02');
    expect(txs[1].amount, 2000);
  });

  test('skips duplicates against existing API-like rows', () {
    final existing = [
      const BankTransaction(
        date: '2026-09-01',
        description:
            'BCK*AH CAMPUS DIEMEN ZUID NLD Pasvolgnr: 001 Transactie: C00338',
        amount: -12.5,
        currency: 'EUR',
        pending: false,
      ),
    ];
    const raw = '''
Datum,Naam / Omschrijving,Rekening,Tegenrekening,Code,Af Bij,Bedrag (EUR),Mutatiesoort,Mededelingen
20260901,AH CAMPUS DIEMEN,,,,Af,"12,50",Betaalautomaat,Pasvolgnr: 001
20260903,JUMBO,,,,Af,"8,00",Betaalautomaat,
''';
    final result = importIngCsvAgainst(raw: raw, existing: existing);
    expect(result.parsed, 2);
    expect(result.skippedDuplicates, 1);
    expect(result.added, hasLength(1));
    expect(result.added.single.description, contains('JUMBO'));
  });

  test('isSameTransaction matches merchant fingerprints', () {
    const api = BankTransaction(
      date: '2026-09-01',
      description: 'BCK*AH CAMPUS DIEMEN ZUID NLD Pasvolgnr: 001 Transactie: X',
      amount: -3.5,
      currency: 'EUR',
      pending: false,
    );
    const csv = BankTransaction(
      date: '2026-09-01',
      description: 'AH CAMPUS DIEMEN · Pasvolgnr: 001',
      amount: -3.5,
      currency: 'EUR',
      pending: false,
    );
    expect(isSameTransaction(api, csv), isTrue);
  });

  test('API merge drops stale pending not returned by the bank', () {
    const stalePending = BankTransaction(
      date: '2026-09-01',
      description: 'AH CAMPUS DIEMEN',
      amount: -12.5,
      currency: 'EUR',
      pending: true,
    );
    const settled = BankTransaction(
      date: '2026-09-03',
      description: 'BCK*AH CAMPUS DIEMEN ZUID NLD',
      amount: -12.5,
      currency: 'EUR',
      pending: false,
    );
    const olderBooked = BankTransaction(
      date: '2026-08-01',
      description: 'SALARIS',
      amount: 2000,
      currency: 'EUR',
      pending: false,
    );

    final merged = mergeApiTransactionsWithCache(
      [settled],
      [stalePending, olderBooked],
    );

    expect(merged, hasLength(2));
    expect(merged.any((tx) => tx.pending), isFalse);
    expect(merged.any((tx) => tx.description.contains('SALARIS')), isTrue);
    expect(merged.any((tx) => tx.description.contains('AH CAMPUS')), isTrue);
  });

  test('API merge keeps live pending from the feed', () {
    const livePending = BankTransaction(
      date: '2026-09-10',
      description: 'PENDING COFFEE',
      amount: -4.0,
      currency: 'EUR',
      pending: true,
    );
    final merged = mergeApiTransactionsWithCache([livePending], const []);
    expect(merged, hasLength(1));
    expect(merged.single.pending, isTrue);
  });

  test('dropSettledPendingDuplicates removes pending twin of booked', () {
    const pending = BankTransaction(
      date: '2026-09-01',
      description: 'AH CAMPUS DIEMEN',
      amount: -12.5,
      currency: 'EUR',
      pending: true,
    );
    const booked = BankTransaction(
      date: '2026-09-02',
      description: 'BCK*AH CAMPUS DIEMEN ZUID',
      amount: -12.5,
      currency: 'EUR',
      pending: false,
    );
    final cleaned = dropSettledPendingDuplicates([pending, booked]);
    expect(cleaned, hasLength(1));
    expect(cleaned.single.pending, isFalse);
  });
}