import 'package:flutter_test/flutter_test.dart';
import 'package:hvbt_dash/core/protocol/dtc_map.dart';

void main() {
  group('S300 DTC map', () {
    test('contains expected number of entries', () {
      expect(s300DtcMap.length, equals(32)); // 4 bytes × 8 bits
    });

    test('P0130 maps to correct description for ERR00 bit0', () {
      expect(s300DtcMap['ERR00_bit0'], equals('P0130 — O2 Sensor (front)'));
    });

    test('P0505 maps for ERR00 bit2', () {
      expect(s300DtcMap['ERR00_bit2'], equals('P0505 — Idle Air Control Valve'));
    });

    test('P1607 maps for ERR03 bit7', () {
      expect(s300DtcMap['ERR03_bit7'], equals('P1607 — PCM Internal Circuit'));
    });
  });

  group('KPro DTC map', () {
    test('contains entries for 18 bytes (ERR00..ERR17)', () {
      // Every ERR byte has 8 bits = 144 entries total
      expect(kproDtcMap.length, equals(144));
    });

    test('P0130 maps for ERR00 bit0', () {
      expect(kproDtcMap['ERR00_bit0'], equals('P0130 — O2 Sensor (front)'));
    });

    test('ERR17 entries present', () {
      expect(kproDtcMap.containsKey('ERR17_bit0'), isTrue);
      expect(kproDtcMap.containsKey('ERR17_bit7'), isTrue);
    });
  });

  group('decodeDtcs helper', () {
    test('returns empty list when no errors', () {
      final result = decodeDtcs([0, 0, 0, 0], s300DtcMap);
      expect(result, isEmpty);
    });

    test('decodes ERR00 bit0 = P0130', () {
      final result = decodeDtcs([0x01, 0, 0, 0], s300DtcMap);
      expect(result, contains('P0130 — O2 Sensor (front)'));
    });

    test('decodes multiple bits in one byte', () {
      // ERR00 bits 0 and 1
      final result = decodeDtcs([0x03, 0, 0, 0], s300DtcMap);
      expect(result.length, equals(2));
    });

    test('decodes bits across multiple bytes', () {
      // ERR00 bit0 + ERR01 bit0
      final result = decodeDtcs([0x01, 0x01, 0, 0], s300DtcMap);
      expect(result.length, equals(2));
    });

    test('skips bits not in map gracefully', () {
      // Use a small dtcMap with only one entry, but set all bits
      final result = decodeDtcs([0xFF, 0, 0, 0], {'ERR00_bit0': 'P0130 — test'});
      // Only the one mapped bit should appear
      expect(result.length, equals(1));
    });
  });
}