import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:pilotvault_fly/flight_model.dart';
import 'package:pilotvault_fly/fly/camera_exposure.dart';
import 'package:pilotvault_fly/fly/camera_menu.dart';
import 'package:pilotvault_fly/fly/fly_prefs.dart';
import 'package:pilotvault_fly/fly/product_profile.dart';
import 'package:pilotvault_fly/fly/state/camera_state.dart';
import 'package:pilotvault_fly/fly/telemetry_reducer.dart';
import 'package:pilotvault_fly/ui/fly/dialogs/slide_to_confirm.dart';
import 'package:pilotvault_fly/ui/fly/fly_screen.dart';
import 'package:pilotvault_fly/ui/fly/panels/camera_menu/camera_menu_sheet.dart';
import 'package:pilotvault_fly/ui/fly/panels/camera_write.dart';

import 'fake_dji.dart';
import 'profile_fixtures.dart';
import 'telemetry_fixtures.dart';

/// A connected model whose camera has reported [settings] on top of the
/// fixture tick's, plus a system state and an exposure read-back.
FlightModel cameraModel(
  Map<String, dynamic> profile, {
  Map<String, Object?> settings = const <String, Object?>{},
  Map<String, Object?> system = const <String, Object?>{},
}) {
  final FlightModel m = FlightModel()
    ..connected = true
    ..profile = ProductProfile.fromBridge(profile);
  final TelemetryReducer r = TelemetryReducer(m);
  final Map<String, dynamic> t = telemetryTick();
  t['cameraSettings'] = <Object?, Object?>{
    ...(t['cameraSettings'] as Map<Object?, Object?>),
    'exposureMode': 'PROGRAM',
    'isoSetting': 'AUTO',
    'shootPhotoMode': 'SINGLE',
    'meteringMode': 'CENTER',
    'whiteBalancePreset': 'AUTO',
    'histogramEnabled': false,
    ...settings,
  };
  r.apply(t);
  r.apply(<String, dynamic>{'type': 'camera', 'isRecording': false, 'mode': 'SHOOT_PHOTO', ...system});
  r.apply(<String, dynamic>{'type': 'exposure', 'iso': '100', 'shutter': '1/240', 'aperture': 'f/2.8', 'ev': '0.0'});
  return m;
}

/// Re-sends the camera's settings group, as the next telemetry tick would.
void reportSettings(FlightModel m, Map<String, Object?> settings) {
  m.camera.applyTelemetry(settings: <String, dynamic>{...m.camera.reportedSettings, ...settings});
}

void main() {
  group('Exposure rules', () {
    test('A only on adjustable-aperture lenses', () {
      const List<String> all = <String>['PROGRAM', 'SHUTTER_PRIORITY', 'APERTURE_PRIORITY', 'MANUAL'];
      expect(ExposureOptions.modes(const CameraProfile(exposureModes: all)),
          <ExposureMode>[ExposureMode.auto, ExposureMode.shutter, ExposureMode.manual]);
      expect(ExposureOptions.modes(const CameraProfile(exposureModes: all, adjustableApertureSupported: true)), ExposureMode.values);
      expect(ExposureOptions.modes(ProductProfile.fromBridge(phantom4).camera), <ExposureMode>[ExposureMode.auto, ExposureMode.manual],
          reason: 'only what the camera reports');
      expect(ExposureOptions.modes(null), ExposureMode.values, reason: 'preview with nothing connected');
    });

    test('what each mode lets the pilot set', () {
      expect(ExposureMode.auto.isoEditable, isFalse);
      expect(ExposureMode.auto.evEditable, isTrue);
      expect(ExposureMode.shutter.shutterEditable, isTrue);
      expect(ExposureMode.shutter.apertureEditable, isFalse);
      expect(ExposureMode.aperture.apertureEditable, isTrue);
      expect(ExposureMode.manual.evEditable, isFalse, reason: 'EV is the meter in M');
      expect(ExposureMode.fromWire('SHUTTER_PRIORITY'), ExposureMode.shutter);
    });

    test('option lists come from the camera, with fallbacks before the handshake', () {
      final CameraProfile? c = ProductProfile.fromBridge(phantom4).camera;
      expect(ExposureOptions.isos(c), <String>['100', '200', '400', '800', '1600'], reason: 'AUTO is its own toggle');
      expect(ExposureOptions.shutters(c), <String>['1/8000', '1/1000', '1/100', '1/30']);
      expect(ExposureOptions.isos(const CameraProfile()), isNotEmpty);
      expect(ExposureOptions.evs(c), <String>['-3.0', '0.0', '+3.0']);
    });

    test('EV steps to the neighbour in the camera range and stops at the ends', () {
      final List<String> evs = ExposureOptions.evs(null);
      expect(ExposureOptions.stepEv('0.0', evs, 1), '+0.3');
      expect(ExposureOptions.stepEv('0.0', evs, -1), '-0.3');
      expect(ExposureOptions.stepEv('+3.0', evs, 1), isNull);
      expect(ExposureOptions.stepEv(null, evs, 1), '+0.3');
    });

    test('a wheel starts on the nearest value', () {
      const List<String> s = <String>['1/1000', '1/500', '1/240', '1/120'];
      expect(ExposureOptions.nearest(s, '1/240'), 2);
      expect(ExposureOptions.nearest(s, '1/250'), 2);
      expect(ExposureOptions.nearest(const <String>['f/2.8', 'f/4', 'f/5.6'], 'f/4.5'), 1);
    });

    test('meter verdict', () {
      final CameraState c = CameraState()..applyExposure(<String, dynamic>{'ev': '-1.0'});
      expect(meterVerdict(c), MeterVerdict.under);
      c.applyExposure(<String, dynamic>{'ev': '+0.3'});
      expect(meterVerdict(c), MeterVerdict.ok);
    });
  });

  group('Zoom', () {
    test('factor, steps and the digital range', () {
      final CameraState c = CameraState()
        ..applyTelemetry(settings: <String, dynamic>{
          'zoomFocalLength': 240,
          'zoomMin': 240,
          'zoomMax': 960,
          'zoomOpticalMax': 480,
          'zoomStep': 10,
        });
      final ZoomInfo z = c.zoom!;
      expect(z.factor, 1.0);
      expect(z.maxFactor, 4.0);
      expect(z.stepped(true), 330);
      expect(z.stepped(false), 240, reason: 'clamped at the wide end');
      expect(z.digital, isFalse);
      c.applyTelemetry(settings: <String, dynamic>{...c.reportedSettings, 'zoomFocalLength': 600});
      expect(c.zoom!.digital, isTrue);
    });

    test('no zoom without a spec', () {
      expect((CameraState()..applyTelemetry(settings: <String, dynamic>{'zoomFocalLength': 240})).zoom, isNull);
    });
  });

  group('Pending camera writes', () {
    test('show at once, clear when the camera reports the setting moved', () {
      final FlightModel m = cameraModel(phantom4);
      final CameraState c = m.camera;
      c.setPending(<String, Object?>{'photoAspectRatio': 'RATIO_16_9'});
      expect(c.reportedSettings['photoAspectRatio'], 'RATIO_3_2');
      expect(c.photoAspectRatio, 'RATIO_16_9');
      expect(c.isPending('photoAspectRatio'), isTrue);

      // A tick that only moved storage leaves the pending value up.
      c.applyTelemetry(storage: <String, dynamic>{'inserted': true}, settings: c.reportedSettings);
      expect(c.isPending('photoAspectRatio'), isTrue);

      reportSettings(m, <String, Object?>{'photoAspectRatio': 'RATIO_16_9'});
      expect(c.isPending('photoAspectRatio'), isFalse);
      expect(c.setting('photoAspectRatio'), 'RATIO_16_9');
    });

    test('roll back to the reported value', () {
      final CameraState c = cameraModel(phantom4).camera;
      c.setPending(<String, Object?>{'photoAspectRatio': 'RATIO_16_9'});
      c.dropPending(<String>['photoAspectRatio']);
      expect(c.setting('photoAspectRatio'), 'RATIO_3_2');
    });

    test('a refused write rolls back and reports', () async {
      final CameraState c = cameraModel(phantom4).camera;
      final FakeDjiService dji = FakeDjiService()..failWith = PlatformException(code: 'DJI_ERROR', message: 'nope');
      String? failed;
      await writeCameraSetting(
        c,
        label: 'Image size',
        pending: <String, Object?>{'photoAspectRatio': 'RATIO_16_9'},
        send: () => dji.setCameraValue('photoAspectRatio', 'RATIO_16_9'),
        onError: (String label, _) => failed = label,
      );
      expect(failed, 'Image size');
      expect(c.setting('photoAspectRatio'), 'RATIO_3_2');
    });
  });

  group('Camera menu rows', () {
    List<String> ids(CameraMenuTab tab, FlightModel m) =>
        CameraMenu.rowsFor(tab, m.profile, m.camera).map((CameraRow r) => r.id).toList();

    test('photo-mode sub-rows follow the photo mode', () {
      FlightModel m = cameraModel(phantom4, settings: <String, Object?>{'burstCount': 'BURST_COUNT_3', 'intervalSeconds': 5});
      expect(ids(CameraMenuTab.photo, m), <String>['shootPhotoMode', 'photoAspectRatio', 'photoFileFormat']);
      m = cameraModel(phantom4, settings: <String, Object?>{'shootPhotoMode': 'BURST', 'burstCount': 'BURST_COUNT_3'});
      expect(ids(CameraMenuTab.photo, m), contains('burstCount'));
      m = cameraModel(phantom4, settings: <String, Object?>{'shootPhotoMode': 'INTERVAL', 'intervalSeconds': 5});
      expect(ids(CameraMenuTab.photo, m), contains('intervalSeconds'));
    });

    test('a setting the camera never reported has no row', () {
      final FlightModel m = cameraModel(phantom4);
      expect(ids(CameraMenuTab.video, m), isNot(contains('videoCaption')));
      expect(ids(CameraMenuTab.video, cameraModel(phantom4, settings: <String, Object?>{'videoCaption': true})), contains('videoCaption'));
    });

    test('product predicates hide rows', () {
      expect(ids(CameraMenuTab.exposure, cameraModel(phantom4, settings: <String, Object?>{'focusMode': 'AFC'})),
          isNot(contains('focusMode')), reason: 'fixed-focus lens');
      expect(ids(CameraMenuTab.exposure, cameraModel(inspire2X5s)), contains('focusMode'));
    });

    test('custom white balance shows the temperature stepper', () {
      expect(ids(CameraMenuTab.video, cameraModel(phantom4)), isNot(contains('whiteBalanceKelvin')));
      expect(
        ids(CameraMenuTab.video, cameraModel(phantom4, settings: <String, Object?>{'whiteBalancePreset': 'CUSTOM', 'whiteBalanceKelvin': 5600})),
        contains('whiteBalanceKelvin'),
      );
    });

    test('options come from the camera range when it published one', () {
      final FlightModel m = cameraModel(phantom4);
      final ChoiceRow wb = CameraMenu.all.whereType<ChoiceRow>().firstWhere((ChoiceRow r) => r.id == 'whiteBalancePreset');
      expect(wb.options(m.profile, m.camera).map((CameraOption o) => o.value), <String>['AUTO', 'SUNNY', 'CLOUDY', 'CUSTOM']);
      final ChoiceRow size = CameraMenu.all.whereType<ChoiceRow>().firstWhere((ChoiceRow r) => r.id == 'videoSize');
      expect(size.options(m.profile, m.camera).map((CameraOption o) => o.label), <String>['4K 29.97p', '1080p 59.94p']);
      expect(size.current(m.camera), 'RESOLUTION_3840x2160@FRAME_RATE_29_DOT_970_FPS');
    });

    test('labels', () {
      expect(CameraLabels.of('RATIO_16_9'), '16:9');
      expect(CameraLabels.of('BURST_COUNT_7'), '7');
      expect(CameraLabels.of('FILM_A'), 'Film a');
      expect(CameraLabels.fpsLabel('FRAME_RATE_30_FPS'), '30p');
    });

    test('Format and Reset wait for shooting to stop', () {
      final ActionRow format = CameraMenu.all.whereType<ActionRow>().firstWhere((ActionRow r) => r.id == 'formatSd');
      final FlightModel m = cameraModel(phantom4, system: <String, Object?>{'isRecording': true});
      expect(format.blockedReason(m.camera), 'Stop shooting first');
      expect(format.blockedReason(cameraModel(phantom4).camera), isNull);
    });
  });

  group('Camera HUD', () {
    Future<FakeDjiService> pump(WidgetTester tester, FlightModel m, {Size size = const Size(844, 390)}) async {
      tester.view.physicalSize = size;
      tester.view.devicePixelRatio = 1;
      addTearDown(tester.view.reset);
      final FakeDjiService dji = FakeDjiService();
      // A fresh navigator, so a sheet left open by an earlier pump is gone.
      await tester.pumpWidget(const SizedBox());
      await tester.pumpWidget(MaterialApp(home: FlyScreen(model: m, dji: dji)));
      await tester.pump(const Duration(milliseconds: 50));
      return dji;
    }

    Future<void> openMenu(WidgetTester tester, String tab) async {
      await tester.tap(find.byKey(const ValueKey<String>('camera-menu')));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 300));
      await tester.tap(find.byKey(ValueKey<String>('tab-$tab')));
      await tester.pump();
    }

    testWidgets('a menu row writes, shows the pending value, then what the camera reports', (WidgetTester tester) async {
      final FlightModel m = cameraModel(phantom4);
      final FakeDjiService dji = await pump(tester, m);
      await openMenu(tester, 'photo');
      expect(find.text('3:2'), findsOneWidget);
      await tester.tap(find.byKey(const ValueKey<String>('row-photoAspectRatio')));
      await tester.pump();
      await tester.tap(find.byKey(const ValueKey<String>('opt-RATIO_16_9')));
      await tester.pump();
      expect(dji.calls, contains('setCameraValue(photoAspectRatio, RATIO_16_9)'));
      expect(find.text('16:9'), findsOneWidget);
      // The camera never confirmed: the row returns to the real value.
      await tester.pump(cameraSettle);
      expect(find.text('3:2'), findsOneWidget);
      expect(tester.takeException(), isNull);
    });

    testWidgets('the camera confirming keeps the new value', (WidgetTester tester) async {
      final FlightModel m = cameraModel(phantom4);
      await pump(tester, m);
      await openMenu(tester, 'photo');
      await tester.tap(find.byKey(const ValueKey<String>('row-photoFileFormat')));
      await tester.pump();
      await tester.tap(find.byKey(const ValueKey<String>('opt-JPEG')));
      await tester.pump();
      reportSettings(m, <String, Object?>{'photoFileFormat': 'JPEG'});
      await tester.pump(cameraSettle);
      expect(find.text('JPEG'), findsOneWidget);
    });

    testWidgets('a refused write snaps back and says why', (WidgetTester tester) async {
      final FlightModel m = cameraModel(phantom4);
      final FakeDjiService dji = await pump(tester, m);
      dji.failWith = PlatformException(code: 'DJI_ERROR', message: 'Not supported');
      await openMenu(tester, 'video');
      await tester.tap(find.byKey(const ValueKey<String>('row-videoFileFormat')));
      await tester.pump();
      await tester.tap(find.byKey(const ValueKey<String>('opt-MP4')));
      await tester.pump();
      await tester.pump();
      expect(find.text('MOV'), findsOneWidget);
      expect(find.textContaining('Not supported'), findsOneWidget);
    });

    testWidgets('quick exposure: switching to M turns EV into the meter', (WidgetTester tester) async {
      final FlightModel m = cameraModel(phantom4);
      final FakeDjiService dji = await pump(tester, m);
      await tester.tap(find.byKey(const ValueKey<String>('camera-info')));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 300));
      expect(find.text('EV'), findsWidgets);
      await tester.tap(find.byKey(const ValueKey<String>('ev-plus')));
      await tester.pump();
      expect(dji.calls, contains('setEV(+3.0)'), reason: 'next step in the camera range');
      await tester.tap(find.byKey(const ValueKey<String>('exposure-manual')));
      await tester.pump();
      expect(dji.calls, contains('setCameraValue(exposureMode, MANUAL)'));
      expect(find.text('METERED'), findsOneWidget);
      dji.calls.clear();
      await tester.tap(find.byKey(const ValueKey<String>('ev-plus')));
      await tester.pump();
      expect(dji.calls, isEmpty, reason: 'EV is not settable in M');
      await tester.pump(cameraSettle);
    });

    testWidgets('no zoom column without a zoom camera; stepped zoom on hybrid', (WidgetTester tester) async {
      await pump(tester, cameraModel(phantom4));
      expect(find.byKey(const ValueKey<String>('zoom-in')), findsNothing);

      final FakeDjiService dji = await pump(
        tester,
        cameraModel(mavic2Zoom, settings: <String, Object?>{
          'zoomFocalLength': 240,
          'zoomMin': 240,
          'zoomMax': 960,
          'zoomOpticalMax': 480,
          'zoomStep': 10,
        }),
      );
      expect(find.text('1.0×'), findsOneWidget);
      await tester.tap(find.byKey(const ValueKey<String>('zoom-in')));
      await tester.pump();
      expect(dji.calls, contains('setZoomFocalLength(330)'));
      expect(tester.takeException(), isNull);
    });

    testWidgets('tap focuses on a focusing lens, meters on a fixed one; × cancels metering', (WidgetTester tester) async {
      FakeDjiService dji = await pump(tester, cameraModel(inspire2X5s));
      await tester.tapAt(const Offset(422, 195));
      await tester.pump();
      expect(dji.calls, contains('setFocusTarget(0.50, 0.50)'));
      await tester.pump(const Duration(seconds: 2));

      final FlightModel m = cameraModel(phantom4);
      dji = await pump(tester, m);
      await tester.tapAt(const Offset(422, 195));
      await tester.pump();
      expect(dji.calls, contains('setSpotMeteringTarget(0.50, 0.50)'));
      reportSettings(m, <String, Object?>{'meteringMode': 'SPOT'});
      await tester.pump();
      expect(find.text('Exposure'), findsOneWidget);
      await tester.tap(find.byKey(const ValueKey<String>('meter-cancel')));
      await tester.pump();
      expect(dji.calls, contains('setCameraValue(meteringMode, CENTER)'));
      expect(find.text('Exposure'), findsNothing);
      await tester.pump(cameraSettle);
    });

    testWidgets('long press follows the setting', (WidgetTester tester) async {
      addTearDown(() => FlyPrefs.longPress.value = LongPressAction.meter);
      final FakeDjiService dji = await pump(tester, cameraModel(inspire2X5s));
      await tester.longPressAt(const Offset(422, 195));
      await tester.pump();
      expect(dji.calls, contains('setSpotMeteringTarget(0.50, 0.50)'));
      FlyPrefs.longPress.value = LongPressAction.off;
      await tester.pump();
      dji.calls.clear();
      await tester.longPressAt(const Offset(422, 195));
      await tester.pump();
      expect(dji.calls, isEmpty);
    });

    testWidgets('the shutter stops a running interval and shows the mode', (WidgetTester tester) async {
      final FlightModel m = cameraModel(phantom4,
          settings: <String, Object?>{'shootPhotoMode': 'INTERVAL', 'intervalSeconds': 5}, system: <String, Object?>{'shootingInterval': true});
      final FakeDjiService dji = await pump(tester, m);
      expect(find.text('INTERVAL 5s'), findsOneWidget);
      await tester.tap(find.byKey(const ValueKey<String>('shutter')));
      await tester.pump();
      expect(dji.calls, <String>['stopShootPhoto']);
    });

    testWidgets('AE lock toggles from the column', (WidgetTester tester) async {
      final FakeDjiService dji = await pump(tester, cameraModel(phantom4));
      await tester.tap(find.byKey(const ValueKey<String>('ae-lock')));
      await tester.pump();
      expect(dji.calls, contains('setCameraValue(aeLock, true)'));
      await tester.pump(cameraSettle);
    });

    testWidgets('Format SD from the menu is slide-confirmed', (WidgetTester tester) async {
      final FakeDjiService dji = await pump(tester, cameraModel(phantom4));
      await openMenu(tester, 'other');
      final Finder format = find.byKey(const ValueKey<String>('action-formatSd'));
      await tester.scrollUntilVisible(format, 60,
          scrollable: find.descendant(of: find.byType(CameraMenuSheet), matching: find.byType(Scrollable)));
      await tester.tap(format);
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 300));
      expect(find.textContaining('This cannot be undone'), findsOneWidget);
      expect(dji.calls, isNot(contains('formatStorage')));
      await tester.drag(find.byKey(SlideToConfirmTrack.thumbKey), const Offset(600, 0));
      await tester.pump();
      await tester.pump(const Duration(milliseconds: 500));
      expect(dji.calls, contains('formatStorage'));
    });

    testWidgets('lays out without overflow on a small phone and a tablet, menu open', (WidgetTester tester) async {
      for (final Size s in const <Size>[Size(740, 340), Size(1280, 800)]) {
        await pump(tester, cameraModel(inspire2X5s), size: s);
        expect(tester.takeException(), isNull, reason: '$s');
        await tester.tap(find.byKey(const ValueKey<String>('camera-menu')));
        await tester.pump();
        await tester.pump(const Duration(milliseconds: 300));
        for (final String t in <String>['exposure', 'photo', 'video', 'other']) {
          await tester.tap(find.byKey(ValueKey<String>('tab-$t')));
          await tester.pump();
          expect(tester.takeException(), isNull, reason: '$s $t');
        }
      }
    });
  });
}