package net.sourceforge.phpeclipse.wiki.actions;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;

import net.sourceforge.phpeclipse.wiki.editor.WikiEditorPlugin;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.window.Window;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.dialogs.ListSelectionDialog;
import org.eclipse.ui.internal.dialogs.ListContentProvider;

public final class CreateFilesFromLinksEditorAction extends OpenWikiLinkEditorAction {

  class WikiFile implements Comparable {
    IFile file;

    String wikiTitle;

    public WikiFile(IFile f, String title) {
      file = f;
      wikiTitle = title;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.lang.Object#toString()
     */
    public String toString() {
      return wikiTitle + " - " + file.getProjectRelativePath().toString();
    }
    /* (non-Javadoc)
     * @see java.lang.Comparable#compareTo(java.lang.Object)
     */
    public int compareTo(Object o) {
      return wikiTitle.compareTo(((WikiFile)o).wikiTitle);
    }
  }

  public void openWikiLinkOnSelection() {
    IDocument doc = getDocument();
    ArrayList startPositionList = getLinksStartingPosition(doc);

    HashSet wikiNames = new HashSet();
    ArrayList filesList = new ArrayList();
    ArrayList wikiList = new ArrayList();
    String wikiTitle;
    Integer posInteger;
    IFile currentFile = ((IFileEditorInput) editor.getEditorInput()).getFile();

    for (int i = 0; i < startPositionList.size(); i++) {
      posInteger = (Integer) startPositionList.get(i);
      wikiTitle = getWikiTitle(editor, doc, posInteger.intValue());

      if (wikiTitle != null && !wikiTitle.equals("")) {
        if (!wikiNames.contains(wikiTitle)) {
          IFile file = getWikiFile(currentFile, wikiTitle);
          if (!file.exists()) {
            filesList.add(new WikiFile(file, wikiTitle));
          }
          wikiNames.add(wikiTitle);
        }
      }
    }

    if (filesList.size() > 0) {
      Collections.sort(filesList);
      ListSelectionDialog listSelectionDialog = new ListSelectionDialog(WikiEditorPlugin.getDefault().getWorkbench()
          .getActiveWorkbenchWindow().getShell(), filesList, new ListContentProvider(), new LabelProvider(),
          "Select the links for file creation:");
      listSelectionDialog.setTitle("Links found in this article");
      if (listSelectionDialog.open() == Window.OK) {
        Object[] locations = listSelectionDialog.getResult();
        if (locations.length > 0) {
          IFile[] files = new IFile[locations.length];
          String[] wikiTitles = new String[locations.length];
          for (int i = 0; i < files.length; i++) {
            files[i] = ((WikiFile) locations[i]).file;
            wikiTitles[i] = ((WikiFile) locations[i]).wikiTitle;
          }
          
          Job job = new CreateFilesJob(files, wikiTitles);
          //        job.setRule(createRule(files));
          job.setRule(null);
          job.setUser(true);
          job.schedule();
        }
      }

    }
  }

  /**
   * @param doc
   * @return
   */
  private ArrayList getLinksStartingPosition(IDocument doc) {
    ArrayList startPositionList = new ArrayList();
    char[] text = doc.get().toCharArray();
    try {
      char ch = ' ';
      int i = 0;
      int startPos = -1;
      while (true) {
        ch = text[i++];
        switch (ch) {
        case '[':
          ch = text[i++];
          if (ch == '[') {
            startPos = i;
          }
          break;
        case ']':
          ch = text[i++];
          if (ch == ']' && startPos != (-1)) {
            startPositionList.add(new Integer(startPos));
            startPos = -1;
          }
          break;
        case '\r':
        case '\n':
          startPos = -1;
          break;
        }
      }
    } catch (IndexOutOfBoundsException e) {
      // ignore it
    }
    return startPositionList;
  }
}