/*
    * This file is part of Waarp Project (named also Waarp or GG).
    *
    *  Copyright (c) 2019, Waarp SAS, and individual contributors by the @author
    *  tags. See the COPYRIGHT.txt in the distribution for a full listing of
    * individual contributors.
    *
    *  All Waarp Project is free software: you can redistribute it and/or
    * modify it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or (at your
   * option) any later version.
   *
   * Waarp is distributed in the hope that it will be useful, but WITHOUT ANY
   * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
   * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along with
   * Waarp . If not, see <http://www.gnu.org/licenses/>.
   */
  package org.waarp.gateway.kernel.rest;
  
  import com.fasterxml.jackson.databind.node.ArrayNode;
  import com.fasterxml.jackson.databind.node.ObjectNode;
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.handler.codec.http.HttpResponseStatus;
  import io.netty.handler.codec.http.multipart.FileUpload;
  import org.waarp.common.json.JsonHandler;
  import org.waarp.gateway.kernel.rest.DataModelRestMethodHandler.COMMAND_TYPE;
  import org.waarp.gateway.kernel.rest.HttpRestHandler.METHOD;
  
  /**
   * RestMethod handler to implement Root Options handler
   */
  public class RootOptionsRestMethodHandler extends RestMethodHandler {
  
    public static final String ROOT = "root";
  
    public RootOptionsRestMethodHandler(final RestConfiguration config) {
      super(ROOT, "/", true, config, METHOD.OPTIONS);
    }
  
    @Override
    public final void checkHandlerSessionCorrectness(
        final HttpRestHandler handler, final RestArgument arguments,
        final RestArgument result) {
      // nothing
    }
  
    @Override
    public final void getFileUpload(final HttpRestHandler handler,
                                    final FileUpload data,
                                    final RestArgument arguments,
                                    final RestArgument result) {
      // nothing
    }
  
    @Override
    public final Object getBody(final HttpRestHandler handler, final ByteBuf body,
                                final RestArgument arguments,
                                final RestArgument result) {
      return null;
    }
  
    @Override
    public final void endParsingRequest(final HttpRestHandler handler,
                                        final RestArgument arguments,
                                        final RestArgument result,
                                        final Object body) {
      // nothing
    }
  
    @Override
    public final ChannelFuture sendResponse(final HttpRestHandler handler,
                                            final ChannelHandlerContext ctx,
                                            final RestArgument arguments,
                                            final RestArgument result,
                                            final Object body,
                                            final HttpResponseStatus status) {
      return sendOptionsResponse(handler, ctx, result, status);
    }
  
    @Override
    public final void optionsCommand(final HttpRestHandler handler,
                                     final RestArgument arguments,
                                     final RestArgument result) {
      result.setCommand(COMMAND_TYPE.OPTIONS);
      final METHOD[] realmethods = METHOD.values();
      final boolean[] allMethods = new boolean[realmethods.length];
      for (final RestMethodHandler method : handler.restHashMap.values()) {
        for (final METHOD methoditem : method.methods) {
          allMethods[methoditem.ordinal()] = true;
        }
      }
      StringBuilder allow = null;
      for (int i = 0; i < allMethods.length; i++) {
        if (allMethods[i]) {
          if (allow == null) {
           allow = new StringBuilder(realmethods[i].name());
         } else {
           allow.append(',').append(realmethods[i].name());
         }
       }
     }
     StringBuilder allowUri = null;
     for (final RestMethodHandler method : handler.restHashMap.values()) {
       if (allowUri == null) {
         allowUri = new StringBuilder(method.path);
       } else {
         allowUri.append(',').append(method.path);
       }
     }
     final ArrayNode array = JsonHandler.createArrayNode();
     for (final RestMethodHandler method : handler.restHashMap.values()) {
       final ArrayNode array2 = method.getDetailedAllow();
       if (method != this) {
         array.addObject().putArray(method.path).addAll(array2);
       } else {
         array.addObject().putArray(ROOT).addAll(array2);
       }
     }
     if (allow != null && allowUri != null) {
       result.addOptions(allow.toString(), allowUri.toString(), array);
     }
   }
 
   @Override
   protected final ArrayNode getDetailedAllow() {
     final ArrayNode node = JsonHandler.createArrayNode();
 
     final ObjectNode node2 = node.addObject().putObject(METHOD.OPTIONS.name());
     node2.put(RestArgument.REST_FIELD.JSON_PATH.field, path);
     node2.put(RestArgument.REST_ROOT_FIELD.JSON_COMMAND.field,
               COMMAND_TYPE.OPTIONS.name());
 
     return node;
   }
 
 }