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/**
 * Copyright 2011-2017 the original author or authors.
 *
 * 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.springframework.social.google.connect;

import java.util.Map;

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.social.oauth2.AccessGrant;
import org.springframework.social.oauth2.OAuth2Template;
import org.springframework.util.MultiValueMap;

/**
 * Google-specific extension to OAuth2Template.
 *
 * @author Gabriel Axel
 */
public class GoogleOAuth2Template extends OAuth2Template {
  /**
   * Constructor
   */
  public GoogleOAuth2Template(final String clientId, final String clientSecret) {
    super(clientId, clientSecret,
      "https://accounts.google.com/o/oauth2/auth",
      "https://accounts.google.com/o/oauth2/token");
    setUseParametersForClientAuthentication(true);
  }

  @Override
  @SuppressWarnings({"unchecked", "rawtypes"})
  protected AccessGrant postForAccessGrant(final String accessTokenUrl,
                                           final MultiValueMap parameters) {
    final HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
    final HttpEntity> requestEntity = new HttpEntity<>(parameters, headers);
    final ResponseEntity responseEntity =
      getRestTemplate().exchange(accessTokenUrl, HttpMethod.POST, requestEntity, Map.class);
    final Map responseMap = responseEntity.getBody();
    return extractAccessGrant(responseMap);
  }

  private AccessGrant extractAccessGrant(final Map result) {
    final String accessToken = (String) result.get("access_token");
    final String scope = (String) result.get("scope");
    final String refreshToken = (String) result.get("refresh_token");

    // result.get("expires_in") may be an Integer, so cast it to Number first.
    final Number expiresInNumber = (Number) result.get("expires_in");
    final Long expiresIn = (expiresInNumber == null) ? null : expiresInNumber.longValue();

    return createAccessGrant(accessToken, scope, refreshToken, expiresIn, result);
  }
}