/*
 * This file is part of LibrePlan
 *
 * Copyright (C) 2009-2010 Fundación para o Fomento da Calidade Industrial e
 *                         Desenvolvemento Tecnolóxico de Galicia
 * Copyright (C) 2010-2011 Igalia, S.L.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.zkoss.ganttz;

import java.util.List;

import org.joda.time.LocalDate;
import org.zkoss.ganttz.adapters.IDisabilityConfiguration;
import org.zkoss.ganttz.data.GanttDiagramGraph;
import org.zkoss.ganttz.data.Task;
import org.zkoss.ganttz.timetracker.TimeTracker;
import org.zkoss.ganttz.timetracker.TimeTrackerComponent;
import org.zkoss.ganttz.timetracker.zoom.IZoomLevelChangedListener;
import org.zkoss.ganttz.timetracker.zoom.ZoomLevel;
import org.zkoss.ganttz.util.Interval;
import org.zkoss.zk.au.out.AuInvoke;
import org.zkoss.zk.ui.ext.AfterCompose;
import org.zkoss.zul.impl.XulElement;

public class GanttPanel extends XulElement implements AfterCompose {

    private TaskList tasksLists;

    private TimeTrackerComponent timeTrackerComponent;

    private DependencyList dependencyList;

    private final GanttDiagramGraph diagramGraph;

    private final Planner planner;

    private transient IZoomLevelChangedListener zoomLevelChangedListener;

    private LocalDate previousStart;

    private Interval previousInterval;

    public GanttPanel(
            Planner planner,
            List<? extends CommandOnTaskContextualized<?>> commandsOnTasksContextualized,
            CommandOnTaskContextualized<?> doubleClickCommand,
            IDisabilityConfiguration disabilityConfiguration,
            FilterAndParentExpandedPredicates predicate) {

        this.planner = planner;
        FunctionalityExposedForExtensions<?> context = (FunctionalityExposedForExtensions<?>) planner.getContext();

        if (planner.isShowingCriticalPath()) {
            context.showCriticalPath();
        }

        this.diagramGraph = context.getDiagramGraph();
        timeTrackerComponent = timeTrackerForGanttPanel(context.getTimeTracker());

        appendChild(timeTrackerComponent);
        dependencyList = new DependencyList(context);

        tasksLists = TaskList.createFor(
                context, doubleClickCommand, commandsOnTasksContextualized, disabilityConfiguration, predicate);

        appendChild(tasksLists);
        appendChild(dependencyList);
    }

    private TimeTrackerComponent timeTrackerForGanttPanel(TimeTracker timeTracker) {
        return new TimeTrackerComponent(timeTracker) {
            @Override
            protected void scrollHorizontalPercentage(int daysDisplacement) {

                response(
                        "scroll_horizontal",
                        new AuInvoke(GanttPanel.this, "scroll_horizontal", Integer.toString(daysDisplacement)));

                moveCurrentPositionScroll();
            }

            // FIXME: this is quite awful, it should be simple
            @Override
            protected void moveCurrentPositionScroll() {
                // Get the previous data.
                LocalDate previousStart = getPreviousStart();

                // Get the current data
                int diffDays = getTimeTrackerComponent().getDiffDays(previousStart);
                double pixelPerDay = getTimeTrackerComponent().getPixelPerDay();

                response("move_scroll", new AuInvoke(GanttPanel.this, "move_scroll",
                        Integer.toString(diffDays),
                        Double.toString(pixelPerDay)));
            }

            protected void updateCurrentDayScroll() {
                double previousPixelPerDay = getTimeTracker().getMapper().getPixelsPerDay().doubleValue();

                response(
                        "update_day_scroll",
                        new AuInvoke(GanttPanel.this, "update_day_scroll", Double.toString(previousPixelPerDay)));

            }

        };
    }

    @Override
    public void afterCompose() {
        tasksLists.afterCompose();

        dependencyList.setDependencyComponents(
                tasksLists.asDependencyComponents(diagramGraph.getVisibleDependencies()));

        timeTrackerComponent.afterCompose();
        dependencyList.afterCompose();
        savePreviousData();

        if (planner.isExpandAll()) {
            FunctionalityExposedForExtensions<?> context = (FunctionalityExposedForExtensions<?>) planner.getContext();
            context.expandAll();
        }

        if (planner.isFlattenTree()) {
            planner.getPredicate().setFilterContainers(true);
            planner.setTaskListPredicate(planner.getPredicate());
        }
        registerZoomLevelChangedListener();
    }

    public void updateTooltips() {
        for (Task task : this.tasksLists.getAllTasks()) {
            task.updateTooltipText();
        }

        for (TaskComponent taskComponent : this.tasksLists.getTaskComponents()) {
            taskComponent.invalidate();
        }
    }

    public TimeTrackerComponent getTimeTrackerComponent() {
        return timeTrackerComponent;
    }

    public TaskList getTaskList() {
        return tasksLists;
    }

    public DependencyList getDependencyList() {
        return dependencyList;
    }

    public void comingFromAnotherTab() {
        timeTrackerComponent.recreate();
    }

    public void zoomIncrease() {
        savePreviousData();
        getTimeTrackerComponent().updateDayScroll();
        getTimeTracker().zoomIncrease();
    }

    public void zoomDecrease() {
        savePreviousData();
        getTimeTrackerComponent().updateDayScroll();
        getTimeTracker().zoomDecrease();
    }

    public TimeTracker getTimeTracker() {
        return timeTrackerComponent.getTimeTracker();
    }

    public void setZoomLevel(ZoomLevel zoomLevel, int scrollLeft) {
        savePreviousData();
        getTimeTrackerComponent().updateDayScroll();
        getTimeTrackerComponent().setZoomLevel(zoomLevel, scrollLeft);
    }

    private void savePreviousData() {
        this.previousStart = getTimeTracker().getRealInterval().getStart();
        this.previousInterval = getTimeTracker().getMapper().getInterval();
    }

    public Planner getPlanner() {
        return planner;
    }

    private void registerZoomLevelChangedListener() {
        if (zoomLevelChangedListener == null) {
            zoomLevelChangedListener = detailLevel -> adjustZoomColumnsHeight();
            getTimeTracker().addZoomListener(zoomLevelChangedListener);
        }
    }

    public void adjustZoomColumnsHeight() {
        response("adjust_dimensions", new AuInvoke(this, "adjust_dimensions"));
    }

    public LocalDate getPreviousStart() {
        return previousStart;
    }

    public Interval getPreviousInterval() {
        return previousInterval;
    }
}