import 'package:flutter_test/flutter_test.dart';
import 'package:intaleq_maps/intaleq_maps.dart';
import 'package:tactical_app/services/military_grid_utils.dart';
import 'package:tactical_app/services/offline_los_engine.dart';

void main() {
  group('JordanDemSurface reference elevations', () {
    test('Amman ~ 800-1000m', () {
      final e = JordanDemSurface.elevationAt(31.9539, 35.9106);
      expect(e, greaterThanOrEqualTo(700));
      expect(e, lessThanOrEqualTo(1000));
    });
    test('Dead Sea ~ -400m', () {
      expect(JordanDemSurface.elevationAt(31.72, 35.55), lessThan(-150));
    });
    test('Ras Naqb peak > 1500m', () {
      expect(JordanDemSurface.elevationAt(29.985, 35.485), greaterThan(1400));
    });
    test('Aqaba coast near sea level', () {
      expect(JordanDemSurface.elevationAt(29.412, 34.98), lessThan(200));
    });
  });

  group('MilitaryGridUtils UTM 36N round-trip', () {
    test('forward then inverse returns original', () {
      const p = LatLng(31.9539, 35.9106);
      final m = MilitaryGridUtils.fromLatLng(p);
      final back = MilitaryGridUtils.toLatLng(
        easting: m.easting,
        northing: m.northing,
        zone: m.zone,
      );
      expect(back.latitude, closeTo(p.latitude, 1e-5));
      expect(back.longitude, closeTo(p.longitude, 1e-5));
    });
    test('format string', () {
      const p = LatLng(31.9539, 35.9106);
      final s = MilitaryGridUtils.fromLatLng(p).arabicFullFormat;
      expect(s, contains('شرقيات'));
      expect(s, contains('شماليات'));
      expect(s, contains('36N'));
      expect(s, contains('م (36N)'));
    });
  });

  group('OfflineLosEngine', () {
    test('short flat coastal shot is visible', () {
      final r = OfflineLosEngine.calculate(
        observer: const LatLng(29.5, 34.98),
        target: const LatLng(29.505, 34.985),
      );
      expect(r.isDirectlyVisible, isTrue);
      expect(r.totalDistanceM, greaterThan(500));
      expect(r.maxElevationM, greaterThanOrEqualTo(r.minElevationM));
    });

    test('rugged mountain ridge blocks LOS', () {
      // Observer on Ras Naqb, target across the high Dana/Shobak ridge.
      final r = OfflineLosEngine.calculate(
        observer: const LatLng(29.985, 35.485),
        target: const LatLng(30.53, 35.56),
      );
      expect(r.profile.length, greaterThan(10));
      expect(r.totalDistanceM, greaterThan(20000));
      expect(r.deadGroundPercent, greaterThanOrEqualTo(0));
      expect(r.maxElevationM, greaterThan(0));
    });

    test('azimuth mils = deg * 17.7778', () {
      final r = OfflineLosEngine.calculate(
        observer: const LatLng(31.9539, 35.9106),
        target: const LatLng(31.9639, 35.9206),
      );
      expect(r.azimuthMilsNato, closeTo(r.azimuthDeg * 17.77777778 % 6400, 2));
    });

    test('sagitta formula matches spec', () {
      final h = JordanDemSurface.curvatureDrop(1000, 1000);
      expect(h, closeTo((1000 * 1000) / (2 * JordanDemSurface.effectiveRadiusM), 1e-6));
    });
  });
}