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/* Copyright 2020 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.arcgisruntime.sample.buffer

import android.graphics.Color
import android.os.Bundle
import android.view.MotionEvent
import android.widget.Button
import android.widget.EditText
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
import com.esri.arcgisruntime.geometry.GeodeticCurveType
import com.esri.arcgisruntime.geometry.GeometryEngine
import com.esri.arcgisruntime.geometry.LinearUnit
import com.esri.arcgisruntime.geometry.LinearUnitId
import com.esri.arcgisruntime.mapping.ArcGISMap
import com.esri.arcgisruntime.mapping.BasemapStyle
import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener
import com.esri.arcgisruntime.mapping.view.Graphic
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay
import com.esri.arcgisruntime.mapping.view.MapView
import com.esri.arcgisruntime.sample.buffer.databinding.ActivityMainBinding
import com.esri.arcgisruntime.symbology.SimpleFillSymbol
import com.esri.arcgisruntime.symbology.SimpleLineSymbol
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol
import com.esri.arcgisruntime.symbology.SimpleRenderer
import kotlin.math.roundToInt

class MainActivity : AppCompatActivity() {

    private val activityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    private val mapView: MapView by lazy {
        activityMainBinding.mapView
    }

    private val bufferInput: EditText by lazy {
        activityMainBinding.bufferInput
    }

    private val clearButton: Button by lazy {
        activityMainBinding.clearButton
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(activityMainBinding.root)

        // authentication with an API key or named user is required to access basemaps and other
        // location services
        ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY)

        // create a map with a topographic basemap
        mapView.map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC)

        // create a fill symbol for geodesic buffer polygons
        val geodesicOutlineSymbol = SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLACK, 2F)
        val geodesicBufferFillSymbol = SimpleFillSymbol(
            SimpleFillSymbol.Style.SOLID, Color.GREEN,
            geodesicOutlineSymbol
        )

        // create a graphics overlay to display geodesic polygons and set its renderer
        val geodesicGraphicsOverlay = GraphicsOverlay().apply {
            renderer = SimpleRenderer(geodesicBufferFillSymbol)
            opacity = 0.5f
        }

        // create a fill symbol for planar buffer polygons
        val planarOutlineSymbol = SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLACK, 2F)
        val planarBufferFillSymbol = SimpleFillSymbol(
            SimpleFillSymbol.Style.SOLID, Color.RED,
            planarOutlineSymbol
        )

        // create a graphics overlay to display planar polygons and set its renderer
        val planarGraphicsOverlay = GraphicsOverlay().apply {
            renderer = SimpleRenderer(planarBufferFillSymbol)
            opacity = 0.5f
        }

        // create a marker symbol for tap locations
        val tapSymbol = SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CROSS, Color.WHITE, 14F)

        // create a graphics overlay to display tap locations for buffers and set its renderer
        val tapLocationsOverlay = GraphicsOverlay().apply {
            renderer = SimpleRenderer(tapSymbol)
        }

        // add overlays to the mapView
        mapView.graphicsOverlays.addAll(
            listOf(
                geodesicGraphicsOverlay,
                planarGraphicsOverlay,
                tapLocationsOverlay
            )
        )

        // create a buffer around the clicked location
        mapView.onTouchListener =
            object : DefaultMapViewOnTouchListener(applicationContext, mapView) {
                override fun onSingleTapConfirmed(motionEvent: MotionEvent): Boolean {

                    // get the point that was clicked and convert it to a point in the map
                    val screenPoint = android.graphics.Point(
                        motionEvent.x.roundToInt(),
                        motionEvent.y.roundToInt()
                    )
                    val mapPoint = mapView.screenToLocation(screenPoint)

                    // only draw a buffer if a value was entered
                    if (bufferInput.text.toString().isNotEmpty()) {
                        // get the buffer distance (miles) entered in the text box
                        val bufferInMiles = bufferInput.text.toString().toDouble()

                        // convert the input distance to meters, 1609.34 meters in one mile
                        val bufferInMeters = bufferInMiles * 1609.34

                        // create a planar buffer graphic around the input location at the specified distance
                        val bufferGeometryPlanar = GeometryEngine.buffer(mapPoint, bufferInMeters)
                        val planarBufferGraphic = Graphic(bufferGeometryPlanar)

                        // create a geodesic buffer graphic using the same location and distance
                        val bufferGeometryGeodesic = GeometryEngine.bufferGeodetic(
                            mapPoint, bufferInMeters,
                            LinearUnit(LinearUnitId.METERS), Double.NaN, GeodeticCurveType.GEODESIC
                        )
                        val geodesicBufferGraphic = Graphic(bufferGeometryGeodesic)

                        // create a graphic for the user tap location
                        val locationGraphic = Graphic(mapPoint)

                        // add the buffer polygons and tap location graphics to the appropriate graphic overlays
                        planarGraphicsOverlay.graphics.add(planarBufferGraphic)
                        geodesicGraphicsOverlay.graphics.add(geodesicBufferGraphic)
                        tapLocationsOverlay.graphics.add(locationGraphic)
                    } else {
                        Toast.makeText(
                            this@MainActivity,
                            "Please enter a buffer distance first.",
                            Toast.LENGTH_LONG
                        ).show()
                    }
                    return true
                }
            }

        // clear the graphics from the graphics overlays
        clearButton.setOnClickListener {
            planarGraphicsOverlay.graphics.clear()
            geodesicGraphicsOverlay.graphics.clear()
            tapLocationsOverlay.graphics.clear()
        }
    }

    override fun onResume() {
        super.onResume()
        mapView.resume()
    }

    override fun onPause() {
        mapView.pause()
        super.onPause()
    }

    override fun onDestroy() {
        mapView.dispose()
        super.onDestroy()
    }
}