/*
 * Copyright (C) 2015-2019 Yasumasa Suenaga
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package jp.co.ntt.oss.heapstats.fx.plugin.builtin.threadrecorder;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.*;
import javafx.scene.control.cell.CheckBoxTableCell;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.stage.FileChooser;
import jp.co.ntt.oss.heapstats.fx.MainWindowController;
import jp.co.ntt.oss.heapstats.container.threadrecord.ThreadStat;
import jp.co.ntt.oss.heapstats.api.plugin.PluginController;
import jp.co.ntt.oss.heapstats.task.ThreadRecordParseTask;
import jp.co.ntt.oss.heapstats.api.utils.HeapStatsUtils;
import jp.co.ntt.oss.heapstats.fx.utils.TaskAdapter;

import java.io.File;
import java.net.URL;
import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;
import java.util.stream.Collectors;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;


/**
 * FXML Controller class
 *
 * @author Yasumasa Suenaga
 */
public class ThreadRecorderController extends PluginController implements Initializable {

    private static final int TIMELINE_PADDING = 8;

    @FXML
    private TextField fileNameBox;

    @FXML
    private Label startTimeLabel;

    @FXML
    private Label endTimeLabel;

    @FXML
    private TableColumn<ThreadStatViewModel, Boolean> showColumn;

    @FXML
    private TableColumn<ThreadStatViewModel, String> threadNameColumn;

    @FXML
    private TableView<ThreadStatViewModel> timelineView;

    @FXML
    private TableColumn<ThreadStatViewModel, List<ThreadStat>> timelineColumn;
    
    @FXML
    private SplitPane rangePane;
    
    @FXML
    private Button okBtn;
    
    private List<ThreadStat> threadStatList;
    
    private Map<Long, String> idMap;
    
    private ObjectProperty<LocalDateTime> rangeStart;
    
    private ObjectProperty<LocalDateTime> rangeEnd;

    /**
     * Update caption of label which represents time of selection.
     * 
     * @param target Label compornent to draw.
     * @param newValue Percentage of timeline. This value is between 0.0 and 1.0 .
     */
    private void updateRangeLabel(Label target, double newValue){
        if((threadStatList != null) && !threadStatList.isEmpty()){
            LocalDateTime start = threadStatList.get(0).getTime();
            LocalDateTime end = threadStatList.get(threadStatList.size() - 1).getTime();
            long diff = start.until(end, ChronoUnit.MILLIS);
            LocalDateTime newTime = start.plus((long)(diff * (Math.round(newValue * 100.0d) / 100.0d)), ChronoUnit.MILLIS);
            
            if(target == startTimeLabel){
                rangeStart.set(newTime.truncatedTo(ChronoUnit.SECONDS));
            }
            else{
                rangeEnd.set(newTime.plusSeconds(1).truncatedTo(ChronoUnit.SECONDS));
            }
            
            target.setText(newTime.format(HeapStatsUtils.getDateTimeFormatter()));
        }
    }

    /**
     * Initializes the controller class.
     */
    @Override
    public void initialize(URL url, ResourceBundle rb) {
        threadStatList = null;
        rangeStart = new SimpleObjectProperty<>();
        rangeEnd = new SimpleObjectProperty<>();
        
        rangePane.getDividers().get(0).positionProperty().addListener((b, o, n) -> updateRangeLabel(startTimeLabel, n.doubleValue()));
        rangePane.getDividers().get(1).positionProperty().addListener((b, o, n) -> updateRangeLabel(endTimeLabel, n.doubleValue()));

        showColumn.setCellValueFactory(new PropertyValueFactory<>("show"));
        showColumn.setCellFactory(CheckBoxTableCell.forTableColumn(showColumn));
        showColumn.setSortType(TableColumn.SortType.DESCENDING);
        threadNameColumn.setCellValueFactory(new PropertyValueFactory<>("name"));
        timelineColumn.setCellValueFactory(new PropertyValueFactory<>("threadStats"));
        timelineColumn.setCellFactory(param -> new TimelineCell(rangeStart, rangeEnd));
        timelineColumn.prefWidthProperty().bind(timelineView.widthProperty()
                                                            .subtract(showColumn.widthProperty())
                                                            .subtract(threadNameColumn.widthProperty())
                                                            .subtract(TIMELINE_PADDING));
        rangePane.getItems().forEach(n -> SplitPane.setResizableWithParent(n, false));
    }
    
    /**
     * Event handler for open button.
     * @param event Pushing open button event.
     */
    @FXML
    public void onOpenBtnClick(ActionEvent event){
        FileChooser dialog = new FileChooser();
        ResourceBundle resource = ResourceBundle.getBundle("threadrecorderResources", new Locale(HeapStatsUtils.getLanguage()));
        
        dialog.setTitle(resource.getString("dialog.filechooser.title"));
        dialog.setInitialDirectory(new File(HeapStatsUtils.getDefaultDirectory()));
        dialog.getExtensionFilters().addAll(new FileChooser.ExtensionFilter("Thread Recorder file (*.htr)", "*.htr"),
                                            new FileChooser.ExtensionFilter("All files", "*.*"));
        File recorderFile = dialog.showOpenDialog(MainWindowController.getInstance().getOwner());
        
        if(recorderFile != null){
            timelineView.getItems().clear();
            HeapStatsUtils.setDefaultDirectory(recorderFile.getParent());
            fileNameBox.setText(recorderFile.getAbsolutePath());
            
            TaskAdapter<ThreadRecordParseTask> task = new TaskAdapter<>(new ThreadRecordParseTask(recorderFile));
            super.bindTask(task);
            task.setOnSucceeded(evt -> {
                ThreadRecordParseTask parser = task.getTask();
                idMap = parser.getIdMap();
                threadStatList = parser.getThreadStatList();
                rangePane.getDividers().get(0).setPosition(0.0d);
                rangePane.getDividers().get(1).setPosition(1.0d);
                
                rangePane.setDisable(false);
                okBtn.setDisable(false);
                
                // FIX ME! Can we redraw more lightly?
                timelineColumn.prefWidthProperty().addListener((b, o, n) -> onOkBtnClick(null));
            });
            
            Thread parseThread = new Thread(task);
            parseThread.start();
        }
        
    }

    /**
     * Event handler for OK button.
     * @param event Pushing ok button event.
     */
    @FXML
    private void onOkBtnClick(ActionEvent event){
        Map<Long, List<ThreadStat>> statById = threadStatList.stream()
                                                             .filter(s -> s.getTime().isAfter(rangeStart.get()) && s.getTime().isBefore(rangeEnd.get()))
                                                             .collect(Collectors.groupingBy(ThreadStat::getId));
        ObservableList<ThreadStatViewModel> threadStats = FXCollections.observableArrayList(idMap.keySet().stream()
                                .sorted()
                                .map(k -> new ThreadStatViewModel(k, idMap.get(k), rangeStart.get(), rangeEnd.get(), statById.get(k)))
                                .collect(Collectors.toList()));
        timelineView.setItems(threadStats);
        timelineView.getSortOrder().add(showColumn);
    }
    
    @Override
    public String getPluginName() {
        return "Thread Recorder";
    }

    @Override
    public String getLicense() {
        return PluginController.LICENSE_GPL_V2;
    }

    @Override
    public Map<String, String> getLibraryLicense() {
        return null;
    }

    @Override
    public EventHandler<Event> getOnPluginTabSelected() {
        return null;
    }

    @Override
    public Runnable getOnCloseRequest() {
        return null;
    }

}