/*-
 * #%L
 * Grid Exporter Add-on
 * %%
 * Copyright (C) 2022 - 2024 Flowing Code
 * %%
 * 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.
 * #L%
 */
package com.flowingcode.vaadin.addons.gridexporter;

import com.flowingcode.vaadin.addons.demo.DemoSource;
import com.flowingcode.vaadin.addons.demo.SourceCodeViewer;
import com.flowingcode.vaadin.addons.gridhelpers.GridHelper;
import com.flowingcode.vaadin.addons.gridhelpers.HeightMode;
import com.github.javafaker.Faker;
import com.vaadin.flow.component.Html;
import com.vaadin.flow.component.grid.Grid;
import com.vaadin.flow.component.grid.Grid.Column;
import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.router.PageTitle;
import com.vaadin.flow.router.Route;
import java.io.IOException;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import org.apache.poi.EncryptedDocumentException;

@DemoSource
@DemoSource(clazz = VaadinServiceInitListenerImpl.class)
@PageTitle("Big Dataset")
@Route(value = "gridexporter/bigdataset", layout = GridExporterDemoView.class)
@SuppressWarnings("serial")
public class GridExporterBigDatasetDemo extends Div {

  private static final Faker faker = FakerInstance.get();

  public GridExporterBigDatasetDemo() throws EncryptedDocumentException, IOException {
    Grid<Person> grid = new Grid<>(Person.class);
    grid.removeAllColumns();
    grid.setColumnReorderingAllowed(true);
    Column<Person> nameCol = grid.addColumn("name").setHeader("Name");
    Column<Person> lastNameCol = grid.addColumn("lastName").setHeader("Last Name");
    Column<Person> budgetCol = grid.addColumn(item -> "$" + item.getBudget()).setHeader("Budget");
    BigDecimal[] total = new BigDecimal[1];
    total[0] = BigDecimal.ZERO;
    List<Person> persons =
        IntStream.range(0, 1400)
            .asLongStream()
            .mapToObj(
                number -> {
                  Double budget = faker.number().randomDouble(2, 10000, 100000);
                  total[0] = total[0].add(BigDecimal.valueOf(budget));
                  budgetCol.setFooter("$" + total[0]);
                  return new Person(
                      faker.name().firstName(),
                      faker.name().lastName(),
                      faker.number().numberBetween(15, 50),
                      budget);
                }).collect(Collectors.toList());
    grid.setItems(query->persons.stream().skip(query.getOffset()).limit(query.getLimit()));
    grid.setWidthFull();
    setSizeFull();
    GridExporter<Person> exporter = GridExporter.createFor(grid);
    exporter.setAutoSizeColumns(false);
    exporter.setExportValue(budgetCol, item -> "" + item.getBudget());
    exporter.setColumnPosition(lastNameCol, 1);
    exporter.setTitle("People information");
    exporter.setFileName(
        "GridExport" + new SimpleDateFormat("yyyyddMM").format(Calendar.getInstance().getTime()));

    // show-source add(grid);

    // #if vaadin eq 0
    GridHelper.setHeightByRows(grid, 6);
    GridHelper.setHeightMode(grid, HeightMode.ROW);
    Html block1 = new Html(
        """
            <div>
            This configuration prepares the exporter for the BigDataset demo, enabling it to manage resource-intensive
            document generation tasks effectively. In this setup, an upper limit of 10 is established for the cost of
            concurrent downloads, and the big dataset exporter is configured with a cost of 9, while other exporters
            handling smaller datasets retain the default cost of 1. This customization allows a combination of one large
            dataset download alongside one small dataset download, or up to 10 concurrent downloads of smaller datasets
            when no big dataset is being exported.
            </div>""");
    Html block2 = new Html(
        """
            <div>
            Additionally, <code>setConcurrentDownloadTimeout</code> enforces a timeout for acquiring the necessary permits
            during a download operation. If the permits are not obtained within the specified timeframe, the download
            request will be aborted and the <code>DownloadTimeoutEvent</code> listener will execute, preventing prolonged
            waiting periods, especially during peak system loads.
            </div>""");

    add(block1, grid, block2);
    SourceCodeViewer.highlightOnHover(block1, "concurrent");
    SourceCodeViewer.highlightOnHover(block2,
        "VaadinServiceInitListenerImpl.java#setConcurrentDownloadTimeout");
    // #endif
    // begin-block concurrent
    exporter.setConcurrentDownloadCost(9);
    // end-block

    // Prevents additional downloads from starting while one is already in progress
    exporter.setDisableOnClick(true);
  }

}