//   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.plugin.usability2.rules.patterns;

import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import com.google.common.base.Optional;

import de.ugoe.cs.autoquest.eventcore.Event;
import de.ugoe.cs.autoquest.eventcore.IEventTarget;
import de.ugoe.cs.autoquest.eventcore.IEventType;
import de.ugoe.cs.autoquest.eventcore.gui.MouseClick;
import de.ugoe.cs.autoquest.eventcore.gui.Scroll;
import de.ugoe.cs.autoquest.usability.EvaluationMethodCaller;
import de.ugoe.cs.autoquest.usability.result.UsabilityProblemDescription;
import de.ugoe.cs.autoquest.usability.result.UsabilityProblemDescriptionResolver;
import de.ugoe.cs.autoquest.usability.rules.UsabilityRule;
import de.ugoe.cs.autoquest.usability.rules.UsabilityUsageProblem;
import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskModel;

/**
 * <p>
 * Test Rule to see if new pattern method may be used for problem checking
 * </p>
 * 
 * @author Konni Hartmann
 */
public class SessionPatternProblem extends UsabilityRule implements UsabilityUsageProblem {

    private final Collection<List<Event>> sessions;

    /**
     * <p>
     * TODO: comment
     * </p>
     * 
     * @param taskTree
     */
    public SessionPatternProblem(ITaskModel taskModel, Collection<List<Event>> sessions) {
        super(taskModel);
        this.sessions = sessions; 
        this.name = "PatternProblem";
        this.defect =
            new UsabilityProblemDescriptionResolver().descriptionFor("PatternProblem");
        initUsagePattern();
    }

    /**
     * <p>
     * TODO: comment
     * </p>
     * 
     */
    private void initUsagePattern() {
    }

    private class Statistics implements Comparable<Statistics> {

        private IEventTarget target;
        private int match;
        private int all;

        public Statistics(IEventTarget target) {
            this.target = target;
        }

        int matchCount() {
            return match;
        }

        int allCount() {
            return all;
        }

        float percent() {
            return ((float) matchCount()) / allCount();
        }

        @Override
        public int compareTo(Statistics o) {
            float thisPcnt = percent();
            float otherPcnt = o.percent();

            if (thisPcnt < otherPcnt)
                return -1;
            if (thisPcnt > otherPcnt)
                return 1;
            return 0;
        }

        @Override
        public String toString() {
            StringBuilder str = new StringBuilder();
            
            str.append(target.getStringIdentifier());
            str.append(" (").append(percent()).append(')');

            return str.toString();
        }

        public void increaseCount() {
            this.all++;
        }

        public void increaseMatchCount() {
            this.match++;
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see de.ugoe.cs.autoquest.usability.rules.UsabilityRule#check()
     */
    @Override
    public Optional<UsabilityProblemDescription> check() {
        Optional<UsabilityProblemDescription> present = Optional.absent();

        System.out.println("--");
        System.out.println("PP:");

        Map<IEventTarget, Statistics> results = new HashMap<IEventTarget, Statistics>();
        
        int cnt = 0, click=0, scroll=0;
        
        for (List<Event> events : this.sessions) {
            IEventType last = null;

            for (Event event : events) {
                    IEventType type = event.getType();
                    
                    if (type instanceof MouseClick) {
                        click++;
                        IEventTarget target = event.getTarget();
                        
                        Statistics statistics = results.get(target);
                        if (statistics == null) {
                            statistics = new Statistics(target);
                            results.put(target, statistics);
                        }
                        
                        statistics.increaseCount();
                        
                        if(last != null && last instanceof Scroll) {
                            scroll++;
                            statistics.increaseMatchCount();
                        }
                    }
                    
                    last = type;
                    cnt++;
            }
        }
        System.out.printf("Analyzed %d events with %d clicks and %d scrolls before clicks.\n", cnt, click, scroll);

        analyzeResults(results);

        /*
         * System.out.println("PATTERN2:"); for (ITask task : tasks) { IResult result =
         * this.pattern2.match(task);
         * 
         * result = this.pattern2.match(task);
         * 
         * if (result.isPresent()) { present = Optional.of(this.defect);
         * System.out.printf("2: %s, %s, %d\n", task.getId(), task.getDescription(), task
         * .getInstances().size()); } }
         */

        System.out.println("Finished Pattern analysis");
        return present;
    }

    private void analyzeResults(Map<IEventTarget, Statistics> results) {

        List<Statistics> pcnt95 = new LinkedList<Statistics>();
        List<Statistics> pcnt75 = new LinkedList<Statistics>();
        List<Statistics> pcnt50 = new LinkedList<Statistics>();
        List<Statistics> pcnt25 = new LinkedList<Statistics>();
        List<Statistics> pcnt05 = new LinkedList<Statistics>();

        for (Statistics s : results.values()) {
            float percent = s.percent();

            if (percent >= 0.95)
                pcnt95.add(s);
            else if (percent >= 0.75)
                pcnt75.add(s);
            else if (percent >= 0.50)
                pcnt50.add(s);
            else if (percent >= 0.25)
                pcnt25.add(s);
            else if (percent >= 0.05)
                pcnt05.add(s);
        }

        Comparator<Statistics> reverse = new Comparator<Statistics>() {
            @Override
            public int compare(Statistics o1, Statistics o2) {
                return o2.matchCount() - o1.matchCount();
            }
        };

        Collections.sort(pcnt95, reverse);
        Collections.sort(pcnt75, reverse);
        Collections.sort(pcnt50, reverse);
        Collections.sort(pcnt25, reverse);
        Collections.sort(pcnt05, reverse);

        printFirstN(pcnt95, 3, 0.95);
        printFirstN(pcnt75, 3, 0.75);
        printFirstN(pcnt50, 3, 0.50);
        printFirstN(pcnt25, 3, 0.25);
        printFirstN(pcnt05, 3, 0.05);
    }

    private void printFirstN(List<Statistics> list, int i, double margin) {
        if (!list.isEmpty()) {
            System.out.printf(">= %f :\n", margin);
            for (int j = 0; j < list.size() && j < i; j++) {
                Statistics s = list.get(j);
                System.out.printf("%d [%d]: %s\n", j + 1, s.matchCount(), s);
            }
            if (list.size() >= i) {
                Statistics s = list.get(list.size() - 1);
                System.out.printf("%d [%d]: %s\n", list.size() - 1, s.matchCount(), s);
            }
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * de.ugoe.cs.autoquest.usability.rules.UsabilityRule#callEvaluationMetho(de.ugoe.cs.autoquest
     * .usability.EvaluationMethodCaller)
     */
    @Override
    public Optional<UsabilityProblemDescription> callEvaluationMethod(EvaluationMethodCaller evaluationMethodCaller)
    {
        return evaluationMethodCaller.check(this);
    }
}