Analyze hotspots

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/*
 * Copyright 2017 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.analyzehotspots

import android.app.DatePickerDialog
import android.app.Dialog
import android.app.ProgressDialog
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
import com.esri.arcgisruntime.concurrent.Job
import com.esri.arcgisruntime.geometry.Point
import com.esri.arcgisruntime.geometry.SpatialReference
import com.esri.arcgisruntime.mapping.ArcGISMap
import com.esri.arcgisruntime.mapping.BasemapStyle
import com.esri.arcgisruntime.mapping.Viewpoint
import com.esri.arcgisruntime.mapping.view.MapView
import com.esri.arcgisruntime.sample.analyzehotspots.databinding.ActivityMainBinding
import com.esri.arcgisruntime.sample.analyzehotspots.databinding.DateRangeDialogBinding
import com.esri.arcgisruntime.tasks.geoprocessing.GeoprocessingString
import com.esri.arcgisruntime.tasks.geoprocessing.GeoprocessingTask
import com.google.android.material.floatingactionbutton.FloatingActionButton
import java.text.SimpleDateFormat
import java.util.*

// enum to flag whether the date picker calendar shown should be for the 'from' or 'to' date
enum class InputCalendar {
    From, To
}

class MainActivity : AppCompatActivity() {

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

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

    private val calendarButton: FloatingActionButton by lazy {
        activityMainBinding.calendarButton
    }

    private val TAG = this::class.java.simpleName

    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 the BasemapStyle topographic
    val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC)

        // set the map to the map view
        mapView.map = map
        mapView.setViewpoint(
            Viewpoint(
                Point(-13671170.0, 5693633.0, SpatialReference.create(3857)),
                57779.0
            )
        )

        calendarButton.setOnClickListener {
            showDateRangeDialog()
        }

        showDateRangeDialog()
    }

    /**
     * Creates the date range dialog. Includes listeners to handle click events,
     * which call showCalendar(...) or analyzeHotspots(...).
     */
    private fun showDateRangeDialog() {
        val geoprocessingTask = GeoprocessingTask(getString(R.string.hotspot_911_calls))

        val dateRangeDialogBinding = DateRangeDialogBinding.inflate(layoutInflater)
        // create custom dialog
        Dialog(this).apply {
            setContentView(dateRangeDialogBinding.root)
            setCancelable(true)

            dateRangeDialogBinding.fromDateText.setOnClickListener {
                showCalendar(dateRangeDialogBinding, InputCalendar.From)
            }

            dateRangeDialogBinding.toDateText.setOnClickListener {
                showCalendar(dateRangeDialogBinding, InputCalendar.To)
            }

            dateRangeDialogBinding.analyzeButton.setOnClickListener {
                analyzeHotspots(
                    geoprocessingTask,
                    dateRangeDialogBinding.fromDateText.text.toString(),
                    dateRangeDialogBinding.toDateText.text.toString()
                )
                dismiss()
            }
        }.show()
    }

    /**
     * Shows a date picker dialog and writes the date chosen to the correct editable text.
     *
     * @param inputCalendar enum which specifies which editable text the chosen date should be written to
     */
    private fun showCalendar(
        dateRangeDialogBinding: DateRangeDialogBinding,
        inputCalendar: InputCalendar
    ) {

        // define the date picker dialog
        val calendar = Calendar.getInstance()
        val year = calendar.get(Calendar.YEAR)
        val month = calendar.get(Calendar.MONTH)
        val day = calendar.get(Calendar.DAY_OF_MONTH)

        DatePickerDialog(this, { _, year, monthOfYear, dayOfMonth ->

            val dateString = StringBuilder()
                .append(year)
                .append("-")
                .append(monthOfYear + 1)
                .append("-")
                .append(dayOfMonth)

            when (inputCalendar) {
                InputCalendar.From -> {
                    dateRangeDialogBinding.fromDateText.setText(dateString)
                }
                InputCalendar.To -> {
                    dateRangeDialogBinding.toDateText.setText(dateString)
                }
            }
        }, year, month, day).apply {
            datePicker.minDate = parseDate(getString(R.string.min_date))!!.time
            datePicker.maxDate = parseDate(getString(R.string.max_date))!!.time
            if (inputCalendar == InputCalendar.From) {
                updateDate(1998, 0, 1)
            }
        }.show()
    }

    /**
     * Runs the geoprocessing job, updating progress while loading. On job done, loads the resulting
     * ArcGISMapImageLayer to the map and resets the Viewpoint of the MapView.
     *
     * @param geoprocessingTask Geoprocessing task to generate hotspots
     * @param from string which holds a date
     * @param to   string which holds a date
     */
    private fun analyzeHotspots(geoprocessingTask: GeoprocessingTask, from: String, to: String) {
        geoprocessingTask.loadAsync()

        // a map image layer is generated as a result, clear previous results
        mapView.map.operationalLayers.clear()

        // create parameters for geoprocessing job
        val paramsFuture = geoprocessingTask.createDefaultParametersAsync()
        paramsFuture.addDoneListener {
            try {
                val geoprocessingParameters = paramsFuture.get()
                geoprocessingParameters.processSpatialReference = mapView.spatialReference
                geoprocessingParameters.outputSpatialReference = mapView.spatialReference

                val queryString = StringBuilder("(\"DATE\" > date '")
                    .append(from)
                    .append(" 00:00:00' AND \"DATE\" < date '")
                    .append(to)
                    .append(" 00:00:00')")

                val geoprocessingString = GeoprocessingString(queryString.toString())
                geoprocessingParameters.inputs["Query"] = geoprocessingString
                // create and start geoprocessing job
                val geoprocessingJob = geoprocessingTask.createJob(geoprocessingParameters)
                geoprocessingJob.start()

                // show progress
                val progressDialog = ProgressDialog(this).apply {
                    setTitle(getString(R.string.app_name))
                    setMessage(getString(R.string.dialog_text))
                    setProgressStyle(ProgressDialog.STYLE_HORIZONTAL)
                    show()
                }

                // update progress
                geoprocessingJob.addProgressChangedListener {
                    val progress = geoprocessingJob.progress
                    progressDialog.progress = progress
                }

                // when the job finishes
                geoprocessingJob.addJobDoneListener {
                    // dismiss the dialog
                    progressDialog.dismiss()

                    when (geoprocessingJob.status) {
                        Job.Status.SUCCEEDED -> {
                            // get results
                            val geoprocessingResult = geoprocessingJob.result
                            val hotspotMapImageLayer = geoprocessingResult.mapImageLayer
                            hotspotMapImageLayer.opacity = 0.5f

                            // add new layer to map
                            mapView.map.operationalLayers.add(hotspotMapImageLayer)

                            // zoom to the layer extent
                            hotspotMapImageLayer.addDoneLoadingListener {
                                mapView.setViewpointGeometryAsync(hotspotMapImageLayer.fullExtent)
                            }
                        }
                        else -> Toast.makeText(
                            this,
                            getString(R.string.job_failed),
                            Toast.LENGTH_LONG
                        ).show()
                    }
                }
            } catch (e: Exception) {
                val error = "Error generating geoprocessing parameters: " + e.message
                Toast.makeText(this, error, Toast.LENGTH_LONG).show()
                Log.e(TAG, error)
            }
        }
    }

    /**
     * Parse the date using a simple date format.
     */
    private fun parseDate(date: String): Date? {
        return SimpleDateFormat(getString(R.string.date_format), Locale.US).parse(date)
    }

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

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

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