package net.sf.statcvs.pages;

 import java.util.ArrayList;

 import java.util.Calendar;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.Date;

 import java.util.GregorianCalendar;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.List;

 import java.util.Set;

 import net.sf.statcvs.model.Commit;

 import net.sf.statcvs.model.SymbolicName;

 import net.sf.statcvs.output.ReportConfig;

 public class LogPageMaker {

     private final static String[] MONTH_TWO_CHARACTERS = { "01", "02", "03", "04", "05", "06", "07", "08", "09", "10", "11", "12" };

     private final static String[] MONTH_NAME = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November",

             "December" };

     public static String getAnchor(final SymbolicName tag) {

         return "tag-" + tag.getName().replace('.', '_');

     }

     public static String getURL(final Date date) {

         final Calendar calendar = new GregorianCalendar();

         calendar.setTime(date);

         return getFileName(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH)) + ".html";

     }

     private static String getFileName(final int year, final int month) {

         return year + "-" + MONTH_TWO_CHARACTERS[month];

     }

     private final ReportConfig config;

     private final int year;

     private final int month;

     private final boolean firstLogPage;

     private final List commits = new ArrayList();

     /**

      * Creates a new LogPageMaker.

      * @param year The log page's year

      * @param month The log page's month (0 for January)

      * @param commits A list of commits; those not in the

      *                 right month will be ignored

      * @param outputFormat

      */

     public LogPageMaker(final ReportConfig config, final int year, final int month, final Collection commits, final boolean firstLogPage) {

         this.config = config;

         this.year = year;

         this.month = month;

         this.firstLogPage = firstLogPage;

         final Calendar calendar = new GregorianCalendar();

         final Iterator it = commits.iterator();

         while (it.hasNext()) {

             final Commit commit = (Commit) it.next();

             calendar.setTime(commit.getDate());

             if (calendar.get(Calendar.YEAR) != year || calendar.get(Calendar.MONTH) != month) {

                 continue;

             }

             this.commits.add(commit);

         }

     }

     public NavigationNode toFile() {

         final Page result = this.config.createPage(getFileName(), getTitle(), getTitle() + " Commit Log");

         result.addAttribute("Number of Commits", this.commits.size());

         result.addAttribute("Number of Active Developers", countActiveDevelopers());

         if (!this.commits.isEmpty()) {

             result.addRawContent(new CommitListFormatter(this.config, this.commits, getTags(), true).render());

         }

         return result;

     }

     private String getFileName() {

         if (!firstLogPage) {

         return getFileName(this.year, this.month);

         } 

         return "commitlog";

     }

     private String getTitle() {

         return MONTH_NAME[this.month] + " " + year;

     }

     private int countActiveDevelopers() {

         final Set developers = new HashSet();

         final Iterator it = this.commits.iterator();

         while (it.hasNext()) {

             final Commit commit = (Commit) it.next();

             developers.add(commit.getAuthor());

         }

         return developers.size();

     }

     private List getTags() {

         final List tags = new ArrayList();

         final Calendar calendar = new GregorianCalendar();

         final Iterator it = this.config.getRepository().getSymbolicNames().iterator();

         while (it.hasNext()) {

             final SymbolicName tag = (SymbolicName) it.next();

             calendar.setTime(tag.getDate());

             if (calendar.get(Calendar.YEAR) == this.year && calendar.get(Calendar.MONTH) == this.month) {

                 tags.add(tag);

             }

         }

         Collections.reverse(tags);

         return tags;

     }

 }