/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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.orientechnologies.orient.server.network.protocol.http.command.get;

import com.orientechnologies.orient.core.db.document.ODatabaseDocumentTx;
import com.orientechnologies.orient.core.id.ORecordId;
import com.orientechnologies.orient.core.record.ORecord;
import com.orientechnologies.orient.server.network.protocol.http.OHttpRequest;
import com.orientechnologies.orient.server.network.protocol.http.OHttpResponse;
import com.orientechnologies.orient.server.network.protocol.http.OHttpUtils;
import com.orientechnologies.orient.server.network.protocol.http.command.OServerCommandAuthenticatedDbAbstract;

public class OServerCommandGetDocument extends OServerCommandAuthenticatedDbAbstract {
  private static final String[] NAMES = { "GET|document/*", "HEAD|document/*" };

  @Override
  public boolean execute(final OHttpRequest iRequest, OHttpResponse iResponse) throws Exception {
    ODatabaseDocumentTx db = null;

    final String[] urlParts = checkSyntax(iRequest.url, 3, "Syntax error: document/<database>/<record-id>[/fetchPlan]");

    final String fetchPlan = urlParts.length > 3 ? urlParts[3] : null;

    iRequest.data.commandInfo = "Load document";

    final ORecord<?> rec;

    final int parametersPos = urlParts[2].indexOf('?');
    final String rid = parametersPos > -1 ? urlParts[2].substring(0, parametersPos) : urlParts[2];

    try {
      db = getProfiledDatabaseInstance(iRequest);

      rec = db.load(new ORecordId(rid), fetchPlan);
      if (rec == null)
        iResponse.send(OHttpUtils.STATUS_NOTFOUND_CODE, "Not Found", OHttpUtils.CONTENT_JSON, "Record with id '" + urlParts[2]
            + "' was not found.", null);
      else if (iRequest.httpMethod.equals("HEAD"))
        // JUST SEND HTTP CODE 200
        iResponse.send(OHttpUtils.STATUS_OK_CODE, OHttpUtils.STATUS_OK_DESCRIPTION, null, null,
            OHttpUtils.HEADER_ETAG + rec.getVersion());
      else {
        final String ifNoneMatch = iRequest.getHeader("If-None-Match");
        if (ifNoneMatch != null && rec.getRecordVersion().toString().equals(ifNoneMatch)) {
          // SAME CONTENT, DON'T SEND BACK RECORD
          iResponse.send(OHttpUtils.STATUS_OK_NOMODIFIED_CODE, OHttpUtils.STATUS_OK_NOMODIFIED_DESCRIPTION, null, null,
              OHttpUtils.HEADER_ETAG + rec.getVersion());
        }

        // SEND THE DOCUMENT BACK
        iResponse.writeRecord(rec, fetchPlan, null);
      }

    } finally {
      if (db != null)
        db.close();
    }

    return false;
  }

  @Override
  public String[] getNames() {
    return NAMES;
  }
}
