import 'package:flutter_test/flutter_test.dart';

import 'package:miler/views/Dashboard/pickups/route_metrics.dart';

/// ── `metersToStop` measures the leg the caller is on ──
///
/// It always read the pickup pair, which on the delivery leg measured the
/// ride BACK to the kitchen the rider had just left — the card's distance
/// grew as he approached the customer's door. The leg now arrives as a flag,
/// and these pin the three behaviours that keep both legs honest.
void main() {
  // Roughly Coimbatore: kitchen at RS Puram, door ~4.7 km northeast.
  const riderLat = 11.0080, riderLng = 76.9500; // standing at the kitchen
  const stop = <String, dynamic>{
    'pickuplat': 11.0080,
    'pickuplon': 76.9502, // ~20 m from the rider
    'droplat': 11.0183,
    'droplon': 76.9678, // ~2.2 km away
    'kms': '9.9',
  };

  test('the default is the pickup pair — Home is untouched', () {
    final m = RouteMetricsHelper.metersToStop(
      stop,
      riderLat: riderLat,
      riderLng: riderLng,
    );
    expect(m, isNotNull);
    expect(m!, lessThan(200), reason: 'he is standing at the pickup');
  });

  test('toDrop measures to the door', () {
    final m = RouteMetricsHelper.metersToStop(
      stop,
      riderLat: riderLat,
      riderLng: riderLng,
      toDrop: true,
    );
    expect(m, isNotNull);
    expect(
      m!,
      greaterThan(1500),
      reason: 'the delivery leg is the ride ahead, not the counter behind',
    );
  });

  test('a payload with no drop pair falls back to the pickup pair', () {
    // On many hyperlocal payloads the stop IS the customer's address; a
    // wrong-ish number beats a dash the rider cannot plan with.
    final m = RouteMetricsHelper.metersToStop(
      {'pickuplat': 11.0080, 'pickuplon': 76.9502},
      riderLat: riderLat,
      riderLng: riderLng,
      toDrop: true,
    );
    expect(m, isNotNull);
    expect(m!, lessThan(200));
  });

  test('the backend kms fallback survives the flag', () {
    final m = RouteMetricsHelper.metersToStop({'kms': '9.9'}, toDrop: true);
    expect(m, closeTo(9900, 0.1));
  });
}