Display annotation

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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.displayannotation.components

import android.app.Application
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.data.ServiceFeatureTable
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.layers.AnnotationLayer
import com.arcgismaps.mapping.layers.FeatureLayer
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import kotlinx.coroutines.launch

class DisplayAnnotationViewModel(app: Application) : AndroidViewModel(app) {
    // URL to the feature service for rivers in East Lothian
    private val eastLothianRiversUrl =
        "https://services1.arcgis.com/6677msI40mnLuuLr/arcgis/rest/services/East_Lothian_Rivers/FeatureServer/0"
    // URL to the annotation feature service for rivers in East Lothian
    private val riversAnnotationUrl =
        "https://sampleserver6.arcgisonline.com/arcgis/rest/services/RiversAnnotation/FeatureServer/0"

    // ServiceFeatureTable for the rivers feature service
    private val featureTable: ServiceFeatureTable = ServiceFeatureTable(eastLothianRiversUrl)

    // FeatureLayer created from the ServiceFeatureTable
    private val featureLayer: FeatureLayer = FeatureLayer.createWithFeatureTable(featureTable)

    // AnnotationLayer created from the annotation service URL
    private val annotationLayer: AnnotationLayer = AnnotationLayer(riversAnnotationUrl)

    // ArcGISMap with a light gray canvas basemap and initial viewpoint (East Lothian, Scotland)
    val arcGISMap by mutableStateOf(
        ArcGISMap(BasemapStyle.ArcGISLightGray).apply {
            initialViewpoint = Viewpoint(
                latitude = 55.882436,
                longitude = -2.725610,
                scale = 72223.819286
            )
            // Add both layers to the operational layers before loading
            operationalLayers.addAll(listOf(featureLayer, annotationLayer))
        }
    )

    // Message dialog for error handling
    val messageDialogVM = MessageDialogViewModel()

    init {
        viewModelScope.launch {
            // Listen for load failures on the feature layer
            featureLayer.load().onFailure {
                messageDialogVM.showMessageDialog(it)
            }
            // Listen for load failures on the annotation layer
            annotationLayer.load().onFailure {
                messageDialogVM.showMessageDialog(it)
            }
        }
    }
}