Clip geometry

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/* Copyright 2024 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.clipgeometry.components

import android.app.Application
import androidx.compose.runtime.mutableStateOf
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.GeometryEngine
import com.arcgismaps.geometry.Point
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleFillSymbol
import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.esri.arcgismaps.sample.clipgeometry.R
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import kotlinx.coroutines.launch
import androidx.compose.runtime.getValue
import androidx.compose.runtime.setValue

class ClipGeometryViewModel(application: Application) : AndroidViewModel(application) {
    // create  a map with a topographic basemap style
    val arcGISMap = ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
        initialViewpoint = Viewpoint(40.0, -106.0, 10000000.0)
    }

    private var coloradoGraphic  = createColoradoGraphic()
    private var coloradoFillSymbol = SimpleFillSymbol(
        SimpleFillSymbolStyle.Solid,
        Color(R.color.transparentDarkBlue),
        SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.green, 2f)
    )
    private var envelopesGraphics = createEnvelopeGraphics()

    // graphics overlay to display graphics
    val graphicsOverlay = GraphicsOverlay().apply {
        graphics.add(coloradoGraphic)
        graphics.addAll(envelopesGraphics)
    }

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

    var isClipButtonEnabled by mutableStateOf(false)
    var isResetButtonEnabled by mutableStateOf(false)

    init {
        viewModelScope.launch {
            arcGISMap.load().onFailure { error ->
                messageDialogVM.showMessageDialog(
                    "Failed to load map",
                    error.message.toString()
                )
            }.onSuccess {
                // set the viewpoint of the map
                isClipButtonEnabled = true
            }
        }
    }

    /**
     * Clear the current graphics, then re-add the graphics for Colorado and the clip boxes.
     */
    fun resetGeometry() {

        graphicsOverlay.graphics.clear()

        graphicsOverlay.graphics.add(coloradoGraphic)
        coloradoGraphic.isVisible = true

        envelopesGraphics.forEach { graphic ->
            graphicsOverlay.graphics.add(graphic)
        }

        // update the reset button and clip button
        isResetButtonEnabled = false
        isClipButtonEnabled = true
    }

    /**
    * Clip the Colorado geometry using the clip boxes and then add the result to the graphics overlay.
    */
    fun clipGeometry() {

        coloradoGraphic.isVisible = false

        // go through each envelope and clip the colorado geometry using it
        envelopesGraphics.forEach { graphic ->
            val geometry =
                coloradoGraphic.geometry?.let { coloradoGeometry ->
                    GeometryEngine.clipOrNull(coloradoGeometry, graphic.geometry as Envelope)
                }
            val clippedGraphic = Graphic(geometry, coloradoFillSymbol)
            graphicsOverlay.graphics.add(clippedGraphic)
        }

        // update the reset button and clip button
        isResetButtonEnabled = true
        isClipButtonEnabled = false
    }

    /**
     * Create a blue rectangular graphic of the state of Colorado.
     */
    private fun createColoradoGraphic() : Graphic {
        // create a blue graphic of Colorado
        val colorado = Envelope(
            Point(-11362327.128340, 5012861.290274),
            Point(-12138232.018408, 4441198.773776)
        )
        val fillSymbol = SimpleFillSymbol(
            SimpleFillSymbolStyle.Solid,
            Color(R.color.transparentDarkBlue),
            SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.green, 2f)
        )
        val coloradoGraphic = Graphic(colorado, fillSymbol)

        return coloradoGraphic
    }

    /**
     * Create three envelopes, outside, inside and intersecting Colorado graphic.
     */
    private fun createEnvelopeGraphics() : List<Graphic> {
        // create a dotted red outline symbol
        val redOutline = SimpleLineSymbol(SimpleLineSymbolStyle.Dot, Color.red, 3f)

        // create a envelope outside Colorado
        val outsideEnvelope = Envelope(
            Point(-11858344.321294, 5147942.225174),
            Point(-12201990.219681, 5297071.577304)
        )
        val outside = Graphic(outsideEnvelope, redOutline)

        // create a envelope intersecting Colorado
        val intersectingEnvelope = Envelope(
            Point(-11962086.479298, 4566553.881363),
            Point(-12260345.183558, 4332053.378376)
        )
        val intersecting = Graphic(intersectingEnvelope, redOutline)

        // create a envelope inside Colorado
        val insideEnvelope = Envelope(
            Point(-11655182.595204, 4741618.772994),
            Point(-11431488.567009, 4593570.068343)
        )
        val inside = Graphic(insideEnvelope, redOutline)

        return listOf(outside, intersecting, inside)
    }

}