rog_app/lib/features/state/game_view_model.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:latlong2/latlong.dart';
import 'package:rogapp/features/data/checkpoint.dart';
import 'package:rogapp/features/data/data_provider.dart';
import 'package:rogapp/features/data/user_location.dart';
import 'package:rogapp/features/state/game_state.dart';
import 'package:rogapp/features/utils/params.dart';

final gameViewModelProvider =
    StateNotifierProvider<GameViewModel, GameState>((ref) {
  final dataProvider = DataProvider();
  return GameViewModel(dataProvider);
});

class GameViewModel extends StateNotifier<GameState> {
  final DataProvider _dataProvider;

  GameViewModel(this._dataProvider) : super(const GameState()) {
    loadInitialData();
  }

  Future<void> loadInitialData() async {
    List<Feature> markers = await _dataProvider.getMarkers();
    state = state.copyWith(markers: markers);
  }

  void setMarkers(List<Feature> markers) {
    state = state.copyWith(markers: markers);
  }

  void startGame() {
    if (state.isWithinStartRadius) {
      state = state.copyWith(status: GameStatus.started);
    }
  }

  void updateLocation(UserLocation location) {
    Feature startMarker = state.markers.firstWhere(
        (marker) => marker.properties.cp == -1,
        orElse: () => Feature.empty());
    List<Feature> checkpoints =
        state.markers.where((marker) => marker.properties.cp != -1).toList();

    bool isWithinStartRadius =
        _checkProximity(location, startMarker /* start marker location */
            );
    bool hasLeftArea =
        state.hasLeftStartArea || _checkHasLeftStartArea(location, startMarker);

    Feature? atCheckpoint = _checkAtAnyCheckpoint(location, checkpoints);

    // Check if at any checkpoint (except start point after game started)
    bool isAtCheckpoint =
        state.status == GameStatus.started && atCheckpoint != null;
    if (isAtCheckpoint) {
      _handleCheckpointArrival(location, atCheckpoint);
    }

    // Update game state based on the new location
    state = state.copyWith(
      currentLocation: location,
      isWithinStartRadius: isWithinStartRadius,
      hasLeftStartArea: hasLeftArea,
      status: isAtCheckpoint ? GameStatus.atCheckpoint : state.status,
    );
  }

  void _handleCheckpointArrival(UserLocation location, Feature marker) {
    // Directly set the current checkpoint; no need to check if the photo was taken here
    state = state.copyWith(currentCheckpoint: marker);

    // If no checkpoint photo has been taken yet, set the pending action to take a checkpoint photo
    if (!state.checkpointPhotoTaken) {
      state = state.copyWith(pendingAction: PendingAction.checkInPhoto);
    }

    // Additional actions specific to buy points can be prepared here, but it's usually better
    // to handle them after the checkpoint photo is submitted, not at the moment of arrival.
  }

  void submitCheckInPhoto(String photoPath) {
    // Logic to save or upload the check-in photo...
    state = state.copyWith(checkpointPhotoTaken: true);

    // Determine the next action based on the checkpoint type
    if (state.currentCheckpoint != null &&
        isBuyPoint(state.currentCheckpoint!)) {
      state = state.copyWith(pendingAction: PendingAction.receiptPhoto);
    } else {
      // If it's not a buy point, mark the checkpoint visit as complete
      _markCheckpointVisited(state.currentCheckpoint!);
    }
  }

  void submitReceiptPhoto(String photoPath) {
    // Logic to save or upload the receipt photo...
    state = state.copyWith(receiptPhotoTaken: true);

    // After submitting the receipt photo, mark the checkpoint visit as complete
    _markCheckpointVisited(state.currentCheckpoint!);
  }

  void _markCheckpointVisited(Feature checkpoint) {
    state = state.copyWith(
      visitedMarkers: Set.from(state.visitedMarkers)..add(checkpoint),
      hasVisitedCheckpoint: true,
      pendingAction: PendingAction.none, // Reset the pending action
    );

    // Additional logic to determine if the game is completed...
  }

  bool isBuyPoint(Feature checkpoint) {
    if (checkpoint.properties.buyPoint != null) {
      return true;
    }
    return false;
  }

  bool _checkProximity(UserLocation location, Feature startMarker) {
    const Distance distance = Distance();
    return distance(
            LatLng(location.latitude, location.longitude),
            LatLng(startMarker.geometry.latitude,
                startMarker.geometry.longitude)) <=
        startMinDistance;
  }

  bool _checkHasLeftStartArea(UserLocation location, Feature startMarker) {
    const Distance distance = Distance();
    return distance(
            LatLng(location.latitude, location.longitude),
            LatLng(startMarker.geometry.latitude,
                startMarker.geometry.longitude)) >=
        minAwayfromStartDistance;
  }

  Feature? _checkAtAnyCheckpoint(UserLocation location, List<Feature> markers) {
    const Distance distance = Distance();

    for (Feature marker in markers) {
      final double distanceInMeters = distance(
        LatLng(location.latitude, location.longitude),
        LatLng(marker.geometry.latitude, marker.geometry.longitude),
      );
      if (marker.properties.checkinRadious != null &&
          marker.properties.checkinRadious! >= distanceInMeters) {
        return marker;
      }
    }
    return null;
  }

  Feature? _getCheckpointFromLocation(UserLocation location) {
    const thresholdDistance = 50.0; // meters, adjust based on your game design
    const Distance distance = Distance();

    for (final marker in state.markers) {
      final double distanceInMeters = distance(
        LatLng(location.latitude, location.longitude),
        LatLng(marker.geometry.latitude, marker.geometry.longitude),
      );

      if (distanceInMeters <=
          (marker.properties.checkinRadious ?? thresholdDistance)) {
        return marker;
      }
    }

    return null; // No checkpoint is close enough to the user's location
  }

  bool _isBackAtStart(UserLocation location) {
    const startThresholdDistance = 150.0; // Define proximity threshold
    const Distance distance = Distance();

    // Assuming the start point is the first marker
    // Adjust based on your game's logic
    final startPoint = state.markers.first;

    final double distanceToStart = distance(
      LatLng(location.latitude, location.longitude),
      LatLng(startPoint.geometry.latitude, startPoint.geometry.longitude),
    );

    // User is considered back at the start if within the threshold distance
    return distanceToStart <= startThresholdDistance;
  }

  void endGame() {
    if (state.status == GameStatus.gameCompleted) {
      // Perform any end game actions
    }
  }

  void loadGameState(GameState gameState) {
    state = gameState;
  }
}