// Copyright 2008 Google Inc.
//
// 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;

import com.google.gerrit.client.rpc.RpcUtil;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.DialogBox;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwtjsonrpc.client.RemoteJsonException;

/** A dialog box showing an error message, when bad things happen. */
public class ErrorDialog extends DialogBox {
  private final FlowPanel body;

  protected ErrorDialog() {
    super(/* auto hide */true, /* modal */true);
    setText(Gerrit.C.errorDialogTitle());

    body = new FlowPanel();
    final FlowPanel buttons = new FlowPanel();
    buttons.setStyleName("gerrit-ErrorDialog-Buttons");
    final Button closey = new Button();
    closey.setText(Gerrit.C.errorDialogClose());
    closey.addClickListener(new ClickListener() {
      public void onClick(final Widget sender) {
        hide();
      }
    });
    buttons.add(closey);

    final FlowPanel center = new FlowPanel();
    center.setStyleName("gerrit-ErrorDialog");
    center.add(body);
    center.add(buttons);
    add(center);
  }

  /** Create a dialog box to show a single message string. */
  public ErrorDialog(final String message) {
    this();
    body.add(label(message, "gerrit-ErrorDialog-ErrorMessage"));
  }

  /** Create a dialog box to nicely format an exception. */
  public ErrorDialog(final Throwable what) {
    this();

    String cn;
    if (what instanceof RemoteJsonException) {
      cn = RpcUtil.C.errorRemoteJsonException();
    } else {
      cn = what.getClass().getName();
      if (cn.startsWith("java.lang.")) {
        cn = cn.substring("java.lang.".length());
      }
    }

    body.add(label(cn, "gerrit-ErrorDialog-ErrorType"));
    body.add(label(what.getMessage(), "gerrit-ErrorDialog-ErrorMessage"));
  }

  private static Label label(final String what, final String style) {
    final Label r = new Label(what);
    r.setStyleName(style);
    return r;
  }
}