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/*
* Copyright 2014 Objectos, Fábrica de Software LTDA.
*
* 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 br.com.objectos.way.gdrive;

import java.io.IOException;
import java.io.Reader;
import java.net.URL;

import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson.JacksonFactory;
import com.google.api.services.drive.Drive;
import com.google.common.base.Charsets;
import com.google.common.io.CharSource;
import com.google.common.io.Resources;
import com.google.inject.Inject;
import com.google.inject.Provider;

/**
 * @author [email protected] (Marcio Endo)
 */
class DriveExecProvider implements Provider {

  private static final String CLIENTSECRETS_LOCATION = "/client_secrets.json";

  private final GDriveTokens tokens;

  @Inject
  public DriveExecProvider(GDriveTokens tokens) {
    this.tokens = tokens;
  }

  @Override
  public DriveExec get() {
    try {
      NetHttpTransport httpTransport = new NetHttpTransport();
      JsonFactory jsonFactory = new JacksonFactory();

      URL url = Resources.getResource(GDrive.class, CLIENTSECRETS_LOCATION);
      CharSource charSource = Resources.asCharSource(url, Charsets.UTF_8);
      Reader reader = charSource.openStream();
      GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(jsonFactory, reader);

      GoogleCredential credential = new GoogleCredential.Builder()
          .setTransport(httpTransport)
          .setJsonFactory(jsonFactory)
          .setClientSecrets(clientSecrets)
          .build();

      credential.setAccessToken(tokens.accessToken);
      credential.setRefreshToken(tokens.refreshToken);

      Drive drive = new Drive.Builder(httpTransport, jsonFactory, credential)
          .setApplicationName("GDrive")
          .build();

      return new DriveExecValid(drive);

    } catch (IOException e) {
      return new DriveExecError(e);

    }
  }

}