import 'package:flutter_test/flutter_test.dart';

import 'package:miler/data/service_profile.dart';
import 'package:miler/views/Dashboard/activity/activity_format.dart';

/// ─────────────────────────────────────────────────────────────────────────
/// READING A DOORMILE TIMESTAMP
///
/// Doormile timestamps are IST wall-clock in Postgres `timestamp without time
/// zone` columns. Some responses come back with a trailing `Z` anyway — a Go +
/// pgx footgun where a naive DB timestamp loads into `time.Time` under the UTC
/// location and marshals with a zone marker it never had. The console strips it
/// the same way; see `src/utils/doormileTimestamp.js`.
///
/// `DateTime.tryParse` believes the `Z`, and that broke the tracking rail in the
/// one way it cannot survive: on a real phone an event stamped `11:43Z` sorted
/// *below* two 11:57 events, because as an absolute instant it is 17:13 IST —
/// while its own rung still printed `11:43`, so nothing on screen explained the
/// order.
/// ─────────────────────────────────────────────────────────────────────────
void main() {
  group('parseStamp', () {
    test('a false Z is stripped, not believed', () {
      final withZ = parseStamp('2026-08-20T11:43:00.000Z')!;
      final naive = parseStamp('2026-08-20T11:43:00.000')!;

      // Same wall-clock, and therefore the same instant on this device.
      expect(withZ, naive);
      expect(withZ.hour, 11);
      expect(withZ.minute, 43);
      expect(clockOf(withZ), '11:43 AM');
    });

    test('an offset marker is stripped too', () {
      expect(
        parseStamp('2026-08-20T11:43:00+05:30'),
        parseStamp('2026-08-20T11:43:00'),
      );
    });

    test('it sorts by the clock it prints', () {
      // The exact shape of the device bug: a backend stamp and two local ones.
      final placed = parseStamp('2026-08-20T11:43:00.000Z')!;
      final setOff = parseStamp('2026-08-20T11:57:00.000')!;
      expect(placed.isBefore(setOff), isTrue);
    });

    test('empty and unparseable are null, never a fabricated moment', () {
      expect(parseStamp(null), isNull);
      expect(parseStamp(''), isNull);
      expect(parseStamp('   '), isNull);
      expect(parseStamp('not a date'), isNull);
    });
  });

  group('happenedAt', () {
    test('reads through parseStamp, so the list and the record agree', () {
      final row = {'completedat': '2026-08-20T11:43:00.000Z'};
      expect(happenedAt(row), parseStamp('2026-08-20T11:43:00')!);
    });

    test('a record with no usable stamp sinks rather than jumping the day', () {
      expect(happenedAt(const {}).millisecondsSinceEpoch, 0);
    });
  });

  group('routeLineOf', () {
    test('reads as speech, and carries no arrow character', () {
      // Poppins has no U+2192, so the app drew the most-read line on the record
      // as `Vidhya Kitchen ▯ Joe Mathew`. The arrow is a Material glyph on
      // screen now; this string is for screen readers and logs, where the word
      // is what a listener needs anyway.
      const stop = {
        'pickupcustomer': 'Joe Mathew',
        'sourcename': 'Vidhya Kitchen',
      };
      ServiceProfile.setActive(ServiceProfile.milkMan);
      addTearDown(() => ServiceProfile.setActive(ServiceProfile.parcel));

      expect(routeLineOf(stop), 'Vidhya Kitchen to Joe Mathew');
      expect(routeLineOf(stop), isNot(contains('→')));
    });
  });
}