// Copyright (C) 2012 The Android Open Source Project
//
// 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 com.google.gerrit.client.admin;

import com.google.gerrit.client.Gerrit;
import com.google.gerrit.client.api.ExtensionScreen;
import com.google.gerrit.client.plugins.PluginInfo;
import com.google.gerrit.client.plugins.PluginMap;
import com.google.gerrit.client.rpc.Natives;
import com.google.gerrit.client.rpc.ScreenLoadCallback;
import com.google.gerrit.client.ui.FancyFlexTable;
import com.google.gerrit.client.ui.InlineHyperlink;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.FlexTable.FlexCellFormatter;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.ImageResourceRenderer;
import com.google.gwt.user.client.ui.Panel;

public class PluginListScreen extends PluginScreen {

  private Panel pluginPanel;
  private PluginTable pluginTable;

  @Override
  protected void onInitUI() {
    super.onInitUI();
    initPluginList();
  }

  @Override
  protected void onLoad() {
    super.onLoad();
    PluginMap.all(
        new ScreenLoadCallback<PluginMap>(this) {
          @Override
          protected void preDisplay(PluginMap result) {
            pluginTable.display(result);
          }
        });
  }

  private void initPluginList() {
    pluginTable = new PluginTable();
    pluginTable.addStyleName(Gerrit.RESOURCES.css().pluginsTable());

    pluginPanel = new FlowPanel();
    pluginPanel.setWidth("500px");
    pluginPanel.add(pluginTable);
    add(pluginPanel);
  }

  private static class PluginTable extends FancyFlexTable<PluginInfo> {
    PluginTable() {
      table.setText(0, 1, AdminConstants.I.columnPluginName());
      table.setText(0, 2, AdminConstants.I.columnPluginSettings());
      table.setText(0, 3, AdminConstants.I.columnPluginVersion());
      table.setText(0, 4, AdminConstants.I.columnPluginStatus());

      final FlexCellFormatter fmt = table.getFlexCellFormatter();
      fmt.addStyleName(0, 1, Gerrit.RESOURCES.css().dataHeader());
      fmt.addStyleName(0, 2, Gerrit.RESOURCES.css().dataHeader());
      fmt.addStyleName(0, 3, Gerrit.RESOURCES.css().dataHeader());
      fmt.addStyleName(0, 4, Gerrit.RESOURCES.css().dataHeader());
    }

    void display(PluginMap plugins) {
      while (1 < table.getRowCount()) {
        table.removeRow(table.getRowCount() - 1);
      }

      for (PluginInfo p : Natives.asList(plugins.values())) {
        final int row = table.getRowCount();
        table.insertRow(row);
        applyDataRowStyle(row);
        populate(row, p);
      }
    }

    void populate(int row, PluginInfo plugin) {
      if (plugin.disabled() || plugin.indexUrl() == null) {
        table.setText(row, 1, plugin.name());
      } else {
        table.setWidget(
            row, 1, new Anchor(plugin.name(), Gerrit.selfRedirect(plugin.indexUrl()), "_blank"));

        if (new ExtensionScreen(plugin.name() + "/settings").isFound()) {
          InlineHyperlink adminScreenLink = new InlineHyperlink();
          adminScreenLink.setHTML(new ImageResourceRenderer().render(Gerrit.RESOURCES.gear()));
          adminScreenLink.setTargetHistoryToken("/x/" + plugin.name() + "/settings");
          adminScreenLink.setTitle(AdminConstants.I.pluginSettingsToolTip());
          table.setWidget(row, 2, adminScreenLink);
        }
      }

      table.setText(row, 3, plugin.version());
      table.setText(
          row,
          4,
          plugin.disabled() ? AdminConstants.I.pluginDisabled() : AdminConstants.I.pluginEnabled());

      final FlexCellFormatter fmt = table.getFlexCellFormatter();
      fmt.addStyleName(row, 1, Gerrit.RESOURCES.css().dataCell());
      fmt.addStyleName(row, 2, Gerrit.RESOURCES.css().dataCell());
      fmt.addStyleName(row, 3, Gerrit.RESOURCES.css().dataCell());
      fmt.addStyleName(row, 4, Gerrit.RESOURCES.css().dataCell());

      setRowItem(row, plugin);
    }
  }
}