/*
 * Copyright (C) 2015 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.jboss.errai.demo.todo.client.local;

import java.util.Set;

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import javax.validation.ConstraintViolation;
import javax.validation.Validator;

import org.jboss.errai.bus.client.api.BusErrorCallback;
import org.jboss.errai.bus.client.api.messaging.Message;
import org.jboss.errai.common.client.api.Caller;
import org.jboss.errai.common.client.api.RemoteCallback;
import org.jboss.errai.databinding.client.api.DataBinder;
import org.jboss.errai.demo.todo.shared.RegistrationException;
import org.jboss.errai.demo.todo.shared.SignupService;
import org.jboss.errai.demo.todo.shared.TodoListUser;
import org.jboss.errai.ui.nav.client.local.Page;
import org.jboss.errai.ui.nav.client.local.TransitionTo;
import org.jboss.errai.ui.shared.api.annotations.AutoBound;
import org.jboss.errai.ui.shared.api.annotations.Bound;
import org.jboss.errai.ui.shared.api.annotations.DataField;
import org.jboss.errai.ui.shared.api.annotations.EventHandler;
import org.jboss.errai.ui.shared.api.annotations.Templated;
import org.slf4j.Logger;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.PasswordTextBox;
import com.google.gwt.user.client.ui.TextBox;

@Templated("#main")
@Page(path="signup")
public class SignupPage extends Composite {

  @Inject @AutoBound private DataBinder<TodoListUser> user;
  
  @Inject private @DataField Label overallErrorMessage;
  @Inject private @Bound @DataField TextBox shortName;
  @Inject private @Bound @DataField TextBox fullName;
  @Inject private @Bound @DataField TextBox email;

  @Inject private @DataField PasswordTextBox password1;
  @Inject private @DataField PasswordTextBox password2;

  @Inject private @DataField Button signupButton;

  @Inject private Caller<SignupService> signupService;

  @Inject private TransitionTo<TodoListPage> todoListPageLink;

  @Inject private Validator validator;
  
  @Inject private Logger logger;

  @PostConstruct
  private void init() {
    overallErrorMessage.setVisible(false);
  }

  @EventHandler("signupButton")
  private void doSignup(ClickEvent e) {
    Set<ConstraintViolation<TodoListUser>> violations = validator.validate(user.getModel());
    if (violations.size() > 0) {
      ConstraintViolation<TodoListUser> violation = violations.iterator().next();
      overallErrorMessage.setText(violation.getPropertyPath() + " " + violation.getMessage());
      overallErrorMessage.setVisible(true);
      return;
    }

    // Passwords are not part of the user bean, so we do manual validation for these fields
    if (password1.getText().length() < 8) {
      overallErrorMessage.setText("Password must be at least 8 characters");
      overallErrorMessage.setVisible(true);
      return;
    }

    if (!password1.getText().equals(password2.getText())) {
      overallErrorMessage.setText("Password fields do not match");
      overallErrorMessage.setVisible(true);
      return;
    }

    try {
      signupService.call(new RemoteCallback<TodoListUser>() {
        @Override
        public void callback(final TodoListUser user) {
          todoListPageLink.go();
        }
      },
      new BusErrorCallback() {
        @Override
        public boolean error(Message message, Throwable throwable) {
          overallErrorMessage.setText(throwable.getMessage());
          overallErrorMessage.setVisible(true);
          logger.error(throwable.getMessage(), throwable);
          return false;
        }
      }).register(user.getModel(), password1.getText());
    } catch (RegistrationException e1) {
      // won't happen for async remote call
    }
  }
  
}