//   Copyright 2012 Georg-August-Universität Göttingen, Germany
//
//   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 de.ugoe.cs.autoquest.usability;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import de.ugoe.cs.autoquest.eventcore.IEventType;
import de.ugoe.cs.autoquest.eventcore.gui.MouseButtonInteraction;
import de.ugoe.cs.autoquest.eventcore.gui.MouseClick;
import de.ugoe.cs.autoquest.eventcore.gui.MouseDoubleClick;
import de.ugoe.cs.autoquest.eventcore.guimodel.IButton;
import de.ugoe.cs.autoquest.eventcore.guimodel.IGUIElement;
import de.ugoe.cs.autoquest.eventcore.guimodel.IGUIView;
import de.ugoe.cs.autoquest.eventcore.guimodel.IImage;
import de.ugoe.cs.autoquest.eventcore.guimodel.IText;
import de.ugoe.cs.autoquest.tasktrees.treeifc.DefaultTaskInstanceTraversingVisitor;
import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTaskInstance;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskModel;
import de.ugoe.cs.autoquest.tasktrees.treeifc.IUserSession;

/**
 * TODO comment
 * 
 * @version $Revision: $ $Date: 16.07.2012$
 * @author 2012, last modified by $Author: pharms$
 */
public class MisleadingClickCueRule implements UsabilityEvaluationRule {

    /*
     * (non-Javadoc)
     * 
     * @see de.ugoe.cs.usability.UsabilityEvaluationRule#evaluate(TaskTree)
     */
    @Override
    public UsabilityEvaluationResult evaluate(ITaskModel taskModel) {
        UselessClickStatistics statistics = new UselessClickStatistics();
        int allObserved = calculateStatistics(taskModel.getUserSessions(), statistics);

        UsabilityEvaluationResult results = new UsabilityEvaluationResult(taskModel);
        analyzeStatistics(statistics, allObserved, results);

        return results;
    }

    /**
     *
     */
    private void analyzeStatistics(UselessClickStatistics    statistics,
                                   int                       allObserved,
                                   UsabilityEvaluationResult results)
    {
        for (Map.Entry<IGUIElement, Map<IGUIView, Integer>> uselessClickCounter :
                statistics.getUselessClickCounters().entrySet())
        {
            int uselessClicks = 0;
            int noOfViewDisplays = 0;
            
            for (Map.Entry<IGUIView, Integer> counter : uselessClickCounter.getValue().entrySet()) {
                uselessClicks += counter.getValue();
                noOfViewDisplays += statistics.getViewOpenedCount(counter.getKey());
            }

            int ratio = Math.min(1000, 1000 * uselessClicks / noOfViewDisplays);

            UsabilitySmellIntensity intensity =
                UsabilitySmellIntensity.getIntensity(ratio, uselessClicks, -1);

            if (intensity != null) {
                Map<String, Object> parameters = new HashMap<String, Object>();
                parameters.put("noOfViewDisplays", noOfViewDisplays);
                parameters.put("uselessClicks", uselessClicks);
                parameters.put("element", uselessClickCounter.getKey());

                results.addSmell
                    (intensity, UsabilitySmellDescription.MISLEADING_CLICK_CUE, parameters);
            }
        }
    }


    /**
     * 
     */
    private int calculateStatistics(List<IUserSession>            sessions,
                                     final UselessClickStatistics statistics)
    {
        final List<IEventTaskInstance> leafNodes = new ArrayList<>();
        final IGUIView[] currentView = new IGUIView[1];
        
        for (IUserSession session : sessions) {
            currentView[0] = null;
            
            for (final ITaskInstance currentRoot : session) {
                currentRoot.accept(new DefaultTaskInstanceTraversingVisitor() {
                    @Override
                    public void visit(IEventTaskInstance eventTaskInstance) {
                        leafNodes.add(eventTaskInstance);
                        
                        if (eventTaskInstance.getEvent().getTarget() instanceof IGUIElement) {
                            IGUIView view =
                                ((IGUIElement) eventTaskInstance.getEvent().getTarget()).getView();
                            
                            if (((currentView[0] == null) && (view != null)) ||
                                ((currentView[0] != null) && (!currentView[0].equals(view))))
                            {
                                currentView[0] = view;
                                statistics.addViewOpened(view);
                            }
                            
                            if (isUselessMouseClick(eventTaskInstance)) {
                                statistics.addUselessClick(eventTaskInstance);
                            }
                        }
                    }
                });
            }
        }
        
        return leafNodes.size();
    }

    /**
     *
     */
    private boolean isUselessMouseClick(IEventTaskInstance eventTaskInstance) {
        IEventType type = eventTaskInstance.getEvent().getType();
        
        if ((!(type instanceof MouseClick)) && (!(type instanceof MouseDoubleClick))) {
            return false;
        }
        
        if (((MouseButtonInteraction) type).getButton() != MouseButtonInteraction.Button.LEFT) {
            return false;
        }
                
        IGUIElement target = (IGUIElement) eventTaskInstance.getEvent().getTarget();
        
        if ((target instanceof IImage) /*|| (target instanceof IPanel) ||
            (target instanceof IProgressBar) || (target instanceof IScrollPane) ||
            (target instanceof IShape) || (target instanceof ITable)*/ ||
            (target instanceof IText))
        {
            // check if the parent is a button
            IGUIElement parent = target;
            while ((parent != null) && !(parent instanceof IButton)) {
                parent = parent.getParent();
            }
            
            return !(parent instanceof IButton);
        }
        else {
            return false;
        }
    }

    /**
     *
     */
    private static class UselessClickStatistics {
        
        /** */
        private Map<IGUIView, Integer> viewOpenedCounters = new HashMap<>();
        
        /** */
        private Map<IGUIElement, Map<IGUIView, Integer>> uselessClickCounters = new HashMap<>();

        /**
         * <p>
         * TODO: comment
         * </p>
         *
         */
        private void addViewOpened(IGUIView view) {
            Integer counter = viewOpenedCounters.get(view);
            
            if (counter == null) {
                viewOpenedCounters.put(view, 1);
            }
            else {
                viewOpenedCounters.put(view, counter + 1);
            }
        }

        /**
         * <p>
         * TODO: comment
         * </p>
         *
         */
        private void addUselessClick(IEventTaskInstance eventTaskInstance) {
            IGUIElement target = (IGUIElement) eventTaskInstance.getEvent().getTarget();
            
            Map<IGUIView, Integer> counterMap = uselessClickCounters.get(target);
            
            if (counterMap == null) {
                counterMap = new HashMap<>();
                uselessClickCounters.put(target, counterMap);
            }
            
            Integer counter = counterMap.get(target.getView());
            
            if (counter == null) {
                counterMap.put(target.getView(), 1);
            }
            else {
                counterMap.put(target.getView(), counter + 1);
            }
        }

        /**
         *
         */
        private Map<IGUIElement, Map<IGUIView, Integer>> getUselessClickCounters() {
            return uselessClickCounters;
        }

        /**
         *
         */
        private int getViewOpenedCount(IGUIView view) {
            Integer counter = viewOpenedCounters.get(view);
            
            if (counter == null) {
                return 0;
            }
            else {
                return counter;
            }
        }
    }
}
