Monitor changes to map load status

/* 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.monitorchangestomaploadstatus

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.runtime.Composable
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.esri.arcgismaps.sample.sampleslib.theme.SampleAppTheme
import com.esri.arcgismaps.sample.monitorchangestomaploadstatus.screens.MonitorChangesToMapLoadStatusScreen

class MainActivity : ComponentActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        // authentication with an API key or named user is
        // required to access basemaps and other location services
        ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.ACCESS_TOKEN)
        setContent {
            SampleAppTheme {
                MonitorChangesToMapLoadStatusApp()
            }
        }
    }

    @Composable
    private fun MonitorChangesToMapLoadStatusApp() {
        Surface(color = MaterialTheme.colorScheme.background) {
            MonitorChangesToMapLoadStatusScreen(
                sampleName = getString(R.string.monitor_changes_to_map_load_status_app_name)
            )
        }
    }
}

/* 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.monitorchangestomaploadstatus.components

import android.app.Application
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.LoadStatus
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

/**
 * ViewModel that holds an ArcGISMap and exposes its load status as a StateFlow
 */
class MonitorChangesToMapLoadStatusViewModel(app: Application) : AndroidViewModel(app) {

    // ArcGISMap created once and exposed as a compose state so UI can consume it
    val arcGISMap = ArcGISMap(BasemapStyle.ArcGISImagery).apply {
        // Provide an initial viewpoint
        initialViewpoint = Viewpoint(39.8, -98.6, 10e7)
    }

    // Expose load status string as StateFlow to be observed by the UI
    private val _loadStatusText = MutableStateFlow(LoadStatus.NotLoaded::class.simpleName)
    val loadStatusText = _loadStatusText.asStateFlow()

    // Message dialog view model to show errors
    val messageDialogVM = MessageDialogViewModel()

    init {
        // Load the map and monitor load status changes
        viewModelScope.launch {
            // Start loading the map and show any immediate failure
            arcGISMap.load().onFailure { throwable ->
                messageDialogVM.showMessageDialog(throwable)
            }

            // Collect load status updates and update the StateFlow
            arcGISMap.loadStatus.collect { loadStatus ->
                _loadStatusText.value = loadStatus::class.simpleName
            }
        }
    }
}

/* 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.monitorchangestomaploadstatus.screens

import androidx.compose.foundation.layout.Box
import androidx.compose.material3.Scaffold
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.esri.arcgismaps.sample.monitorchangestomaploadstatus.components.MonitorChangesToMapLoadStatusViewModel
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialog
import com.esri.arcgismaps.sample.sampleslib.components.SampleTopAppBar

/**
 * Main screen that displays a MapView and an overlay showing the map's load status.
 */
@Composable
fun MonitorChangesToMapLoadStatusScreen(sampleName: String) {
    val mapViewModel: MonitorChangesToMapLoadStatusViewModel = viewModel()

    // Observe the load status from the ViewModel
    val loadStatusText by mapViewModel.loadStatusText.collectAsStateWithLifecycle()

    Scaffold(topBar = { SampleTopAppBar(title = sampleName) }) { padding ->

        Box(
            modifier = Modifier
                .fillMaxSize()
                .padding(padding)
        ) {

            MapView(
                modifier = Modifier
                    .fillMaxSize(),
                arcGISMap = mapViewModel.arcGISMap
            )

            // Overlay at the top center that shows the current load status
            Surface(
                modifier = Modifier
                    .fillMaxWidth()
                    .align(Alignment.TopCenter),
                color = MaterialTheme.colorScheme.surface.copy(alpha = 0.9f)
            ) {
                Text(
                    modifier = Modifier
                        .fillMaxWidth()
                        .padding(8.dp),
                    text = "Load Status: $loadStatusText",
                    textAlign = TextAlign.Center,
                    style = MaterialTheme.typography.bodyLarge,
                )
            }
        }

        // Display an error dialog if there's a load error
        mapViewModel.messageDialogVM.apply {
            if (dialogStatus) {
                MessageDialog(
                    title = messageTitle,
                    description = messageDescription,
                    onDismissRequest = ::dismissDialog
                )
            }
        }
    }
}