Show device location

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/* Copyright 2025 Esri
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.esri.arcgismaps.sample.showdevicelocation.components

import android.app.Application
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.setValue
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.location.LocationDisplayAutoPanMode
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.view.LocationDisplay
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import com.esri.arcgismaps.sample.showdevicelocation.R
import kotlinx.coroutines.launch

class ShowDeviceLocationViewModel(app: Application) : AndroidViewModel(app) {

    val arcGISMap = ArcGISMap(BasemapStyle.ArcGISNavigationNight)

    // Create a message dialog view model for handling error messages
    val messageDialogVM = MessageDialogViewModel()

    init {
        viewModelScope.launch {
            arcGISMap.load().onFailure { messageDialogVM.showMessageDialog(it) }
        }
    }

    // available options in dropdown menu
    val dropDownMenuOptions = arrayListOf(
        ItemData("Re-center", R.drawable.locationdisplayrecenter),
        ItemData("Navigation", R.drawable.locationdisplaynavigation),
        ItemData("Compass", R.drawable.locationdisplayheading)
    )

    // This variable holds the currently selected item from the dropdown menu
    var selectedItem by mutableStateOf(dropDownMenuOptions[0])
        private set


    // This function handles the selection of an item from the dropdown menu
    fun onItemSelected(item: ItemData, locationDisplay: LocationDisplay){
        selectedItem = item
        when (item.text) {
            "Re-center" -> {
                // re-center MapView on location
                locationDisplay.setAutoPanMode(LocationDisplayAutoPanMode.Recenter)
            }
            "Navigation" -> {
                // start navigation mode
                locationDisplay.setAutoPanMode(LocationDisplayAutoPanMode.Navigation)
            }
            "Compass" -> {
                // start compass navigation mode
                locationDisplay.setAutoPanMode(LocationDisplayAutoPanMode.CompassNavigation)
            }
        }
    }

    // variable to track if location tracking is enabled
    var isLocationTrackingEnabled by mutableStateOf(true)
        private set

    // function to toggle location tracking based on the switch state
    fun toggleLocationTracking(newValue: Boolean, locationDisplay: LocationDisplay){
        isLocationTrackingEnabled = newValue
        if(isLocationTrackingEnabled) {
            viewModelScope.launch {
                locationDisplay.dataSource.start()
            }
        } else {
            viewModelScope.launch {
                locationDisplay.dataSource.stop()
            }
        }
    }
}

/** Represents an option from dropdown menu */
@Stable
data class ItemData(val text: String, val imageId: Int)