//   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.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;

import de.ugoe.cs.autoquest.tasktrees.treeifc.DefaultTaskInstanceTraversingVisitor;
import de.ugoe.cs.autoquest.tasktrees.treeifc.IEventTaskInstance;
import de.ugoe.cs.autoquest.tasktrees.treeifc.IMarkingTemporalRelationship;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ISequence;
import de.ugoe.cs.autoquest.tasktrees.treeifc.IStructuringTemporalRelationship;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITask;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskInstance;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskModel;
import de.ugoe.cs.util.console.Console;

/**
 * TODO comment
 * 
 * @version $Revision: $ $Date: 16.07.2012$
 * @author 2012, last modified by $Author: pharms$
 */
public class UsabilityEvaluationManager {
    
    /** */
    private List<UsabilityEvaluationRule> rules = new ArrayList<UsabilityEvaluationRule>();

    /**
     * 
     */
    public UsabilityEvaluationManager() {
        super();
        init();
    }

    /**
     * 
     */
    private void init() {
//        rules.add(new TaskTreeTestRule());
        
        rules.add(new EventCoverageRatioRule());
        rules.add(new RequiredInefficientActionsRule());
        rules.add(new TargetDistanceRule());
        rules.add(new MissingFeedbackRule());
        rules.add(new TaskRetryRule());
        rules.add(new DataEntryMethodChangeRule());
        rules.add(new CommonTaskRateRule());
        rules.add(new TextInputStatisticsRule());
        rules.add(new CheckBoxMultipleSelectionRule());
        rules.add(new MisleadingClickCueRule());
        rules.add(new DefaultCursorPositioningRule());
        rules.add(new DefaultValueRule());
        rules.add(new UnusedGUIElementsRule());
        
//        rules.add(new TaskCooccurrenceRule());
    }

    /**
     *
     */
    public UsabilityEvaluationResult evaluateUsability(ITaskModel taskModel,
                                                       int        maxCount,
                                                       boolean    onlyMostRepresentative)
    {
        Console.traceln(Level.INFO, "evaluating usability of task model " + taskModel);

        List<UsabilityEvaluationResult> interimResults = new ArrayList<UsabilityEvaluationResult>();
        Set<ITask> mostRepresentativeTasks = null;

        for (UsabilityEvaluationRule rule : rules) {
            Console.traceln(Level.INFO, "\napplying rule " + rule.getClass().getSimpleName());
            UsabilityEvaluationResult ruleResult = rule.evaluate(taskModel);

            Map<String, List<UsabilitySmell>> smellGroups = new HashMap<>();
            
            for (UsabilitySmell smell : ruleResult.getAllSmells()) {
                List<UsabilitySmell> smellGroup = smellGroups.get(smell.getBriefDescription());
                
                if (smellGroup == null) {
                    smellGroup = new LinkedList<>();
                    smellGroups.put(smell.getBriefDescription(), smellGroup);
                }
                
                smellGroup.add(smell);
            }
            
            for (Map.Entry<String, List<UsabilitySmell>> smellGroup : smellGroups.entrySet()) {
                Console.traceln(Level.INFO, "the rule found " + smellGroup.getValue().size() +
                                " usability smells of type \"" + smellGroup.getKey() + "\"");
                
                ruleResult = new UsabilityEvaluationResult(taskModel, smellGroup.getValue());
                
                checkDuplicates(ruleResult);
                
                if ((onlyMostRepresentative) || (maxCount < ruleResult.getAllSmells().size())) {
                    LinkedList<UsabilitySmell> sortedSmells = new LinkedList<>();
                    
                    if (onlyMostRepresentative) {
                        Console.traceln(Level.INFO, "filtering for smells that refer to only most " +
                                        "representative tasks.");
                    }
                    
                    for (UsabilitySmell smell : ruleResult.getAllSmells()) {
                        if (onlyMostRepresentative && (smell.getSmellingTask() != null)) {
                            if (mostRepresentativeTasks == null) {
                                mostRepresentativeTasks = getMostRepresentativeSequences(taskModel);
                            }
                            
                            if (!mostRepresentativeTasks.contains(smell.getSmellingTask())) {
                                continue;
                            }
                        }
                        
                        ListIterator<UsabilitySmell> iterator = sortedSmells.listIterator();

                        boolean added = false;
                        
                        while (iterator.hasNext()) {
                            if (iterator.next().getIntensity().getEventCoverage() <
                                smell.getIntensity().getEventCoverage())
                            {
                                iterator.previous();
                                iterator.add(smell);
                                added = true;
                                break;
                            }
                        }
                    
                        if (!added) {
                            sortedSmells.add(smell);
                        }
                    
                    }
                    
                    if (maxCount < ruleResult.getAllSmells().size()) {
                        Console.traceln(Level.INFO, "filtering for " + maxCount +
                                " smells of same type with highest event coverage.");
                        
                        while (sortedSmells.size() > maxCount) {
                            sortedSmells.removeLast();
                        }
                    }
                
                    Console.traceln(Level.INFO, sortedSmells.size() + " remaining.");
                    ruleResult = new UsabilityEvaluationResult(taskModel, sortedSmells);
                    checkDuplicates(ruleResult);
                }
            
                interimResults.add(ruleResult);
            }
        }

        UsabilityEvaluationResult result = new UsabilityEvaluationResult(taskModel, interimResults);
        Console.println("the evaluation result contains " + result.getAllSmells().size() +
                        " smells.");

        return result;
    }

    /**
     * <p>
     * TODO: comment
     * </p>
     *
     * @param taskModel
     * @return
     */
    private Set<ITask> getMostRepresentativeSequences(ITaskModel taskModel) {
        Map<Integer, List<ISequence>> coverageCounts = new HashMap<>();
        Map<ISequence, Set<IEventTaskInstance>> coverages = new HashMap<>();
        int maxCoverage = 0;

        for (ITask task : taskModel.getTasks()) {
            if (task instanceof ISequence) {
                final Set<IEventTaskInstance> coveredEvents = new HashSet<>();

                for (ITaskInstance instance : task.getInstances()) {
                    instance.accept(new DefaultTaskInstanceTraversingVisitor() {
                        @Override
                        public void visit(IEventTaskInstance eventTaskInstance) {
                            coveredEvents.add(eventTaskInstance);
                        }
                    });
                }

                coverages.put((ISequence) task, coveredEvents);

                List<ISequence> tasksWithSameCoverage = coverageCounts.get(coveredEvents.size());

                if (tasksWithSameCoverage == null) {
                    tasksWithSameCoverage = new LinkedList<>();
                    coverageCounts.put(coveredEvents.size(), tasksWithSameCoverage);
                }

                tasksWithSameCoverage.add((ISequence) task);

                maxCoverage = Math.max(maxCoverage, coveredEvents.size());
            }
        }

        Set<ITask> mostRepresentativeSequences = new HashSet<>();

        for (int i = maxCoverage; i > 0; i--) {
            List<ISequence> sequencesWithSameCoverage = coverageCounts.get(i);

            if (sequencesWithSameCoverage == null) {
                continue;
            }

            for (ISequence sequence : sequencesWithSameCoverage) {
                mostRepresentativeSequences.add(sequence);
            }
            
            if ((100 * mostRepresentativeSequences.size() / coverages.size()) > 20) {
                break;
            }
        }

        return mostRepresentativeSequences;
    }

    /**
     *
     */
    private void checkDuplicates(UsabilityEvaluationResult result) {
        List<ITask> referredTasks = new ArrayList<ITask>();

        for (UsabilitySmell smell : result.getAllSmells()) {
            if (smell.getSmellingTask() != null) {
                referredTasks.add(smell.getSmellingTask());
            }
        }
            
        int counter = 0;
        for (int i = 0; i < referredTasks.size(); i++) {
            for (int j = 0; j < referredTasks.size(); j++) {
                if (isChildOf(referredTasks.get(i), referredTasks.get(j))) {
                    counter++;
                    break;
                }
            }
        }
            
        if (counter > 0) {
            Console.traceln(Level.INFO, counter + " of the findings are duplicates in " +
                            "that they refer to tasks whose parent tasks are also " +
                            "referred by the findings");
        }
    }

    /**
     *
     */
    private boolean isChildOf(final ITask potChild, ITask potParent) {
        
        if (potParent instanceof IStructuringTemporalRelationship) {
            for (ITask child : ((IStructuringTemporalRelationship) potParent).getChildren()) {
                if ((child == potChild) || isChildOf(potChild, child)) {
                    return true;
                }
            }
        }
        else if (potParent instanceof IMarkingTemporalRelationship) {
            ITask child = ((IMarkingTemporalRelationship) potParent).getMarkedTask();
            if ((child == potChild) || isChildOf(potChild, child)) {
                return true;
            }
        }
        
        return false;
    }

}