// Copyright (c) 2009 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

package org.chromium.debug.ui;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.chromium.debug.core.model.TabSelector;

import org.chromium.sdk.Browser;

import org.chromium.sdk.Browser.TabConnector;

import org.chromium.sdk.Browser.TabFetcher;

import org.eclipse.swt.widgets.Display;

import org.eclipse.swt.widgets.Shell;

import org.eclipse.ui.PlatformUI;

/**

 * A TabSelector which brings up a dialog allowing users to select which target

 * browser tab to debug.

 */

public class DialogBasedTabSelector implements TabSelector {

  public TabConnector selectTab(TabFetcher tabFetcher) throws IOException {

    List<? extends Browser.TabConnector> allTabs = tabFetcher.getTabs();

    List<Browser.TabConnector> filteredTabs = new ArrayList<TabConnector>(allTabs.size());

    for (Browser.TabConnector tab : allTabs) {

      if (!tab.isAlreadyAttached()) {

        filteredTabs.add(tab);

      }

    }

    if (autoSelectSingleTab()) {

      if (allTabs.size() == 1 && filteredTabs.size() == 1) {

        // if all crystal clear -- choose by default

        // disable auto-select if there are some already attached tabs:

        //  user has already seen this dialog and might have got used to it

        //  he might not understand why it didn't show up this time

        return allTabs.get(0);

      }

    }

    final Map<Integer, Browser.TabConnector> map = new HashMap<Integer, Browser.TabConnector>();

    final List<String> urls = new ArrayList<String>(filteredTabs.size());

    for (int i = 0; i < filteredTabs.size(); ++i) {

      Browser.TabConnector connector = filteredTabs.get(i);

      map.put(i, connector);

      urls.add(connector.getUrl());

    }

    final Browser.TabConnector[] result = { null };

    Display.getDefault().syncExec(new Runnable() {

      public void run() {

        final Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();

        final ChromiumTabSelectionDialog dialog = new ChromiumTabSelectionDialog(shell, urls);

        dialog.setBlockOnOpen(true);

        int dialogResult = dialog.open();

        if (dialogResult == ChromiumTabSelectionDialog.OK) {

          result[0] = map.get(dialog.getSelectedLine());

        }

        // otherwise (result[0] == null) which means "Do not attach"

      }

    });

    return result[0];

  }

  private boolean autoSelectSingleTab() {

    return true;

  }

}