Apply symbology to shapefile

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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.applysymbologytoshapefile.components

import android.app.Application
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.Color
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.layers.FeatureLayer
import com.arcgismaps.data.ShapefileFeatureTable
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleFillSymbol
import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleRenderer
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.SpatialReference
import com.esri.arcgismaps.sample.applysymbologytoshapefile.R
import kotlinx.coroutines.launch
import java.io.File
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel

class ApplySymbologyToShapefileViewModel(application: Application) : AndroidViewModel(application) {
    val provisionPath =
        application.getExternalFilesDir(null)?.path + File.separator + application.getString(R.string.apply_symbology_to_shapefile_app_name)

    // Define renderer: red outline with yellow fill for all features
    private val outlineSymbol = SimpleLineSymbol(
        style = SimpleLineSymbolStyle.Solid,
        color = Color.red,
        width = 1.0f
    )
    private val fillSymbol = SimpleFillSymbol(
        style = SimpleFillSymbolStyle.Solid,
        color = Color.yellow,
        outline = outlineSymbol
    )

    // Initialize the map with a topographic basemap, an initial viewpoint, and the shapefile layer
    val arcGISMap = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        val center = Point(
            x = -11662054.0,
            y = 4818336.0,
            spatialReference = SpatialReference.webMercator()
        )
        initialViewpoint = Viewpoint(center, 200000.0)
    }

    // Create a message dialog view model to surface errors
    val messageDialogVM = MessageDialogViewModel()

    init {
        val shapeFile = File(provisionPath, "Subdivisions.shp")
        if (!shapeFile.exists()) {
            messageDialogVM.showMessageDialog(
                "Shapefile not found",
                "Expected .shp file at ${shapeFile.path}"
            )
        } else {
            // Create shapefile table using local file, and create its layer
            val shapefileTable = ShapefileFeatureTable(
                shapeFile.path
            )
            val featureLayer = FeatureLayer.createWithFeatureTable(shapefileTable).apply {
                // Apply the renderer to the layer
                renderer = SimpleRenderer(fillSymbol)
            }
            // Add the shapefile layer to the map and attempt to load the map
            arcGISMap.operationalLayers.add(featureLayer)
            // Load the configured ArcGIS Map
            viewModelScope.launch {
                arcGISMap.load().onFailure { error ->
                    messageDialogVM.showMessageDialog(error)
                }
            }
        }
    }
}