/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 io.milton.http.json;

import io.milton.common.Path;
import io.milton.http.FileItem;
import io.milton.http.Range;
import io.milton.http.Request;
import io.milton.http.Request.Method;
import io.milton.http.ResourceFactory;
import io.milton.http.exceptions.BadRequestException;
import io.milton.http.exceptions.ConflictException;
import io.milton.http.exceptions.NotAuthorizedException;
import io.milton.resource.CollectionResource;
import io.milton.resource.MoveableResource;
import io.milton.resource.PostableResource;
import io.milton.resource.Resource;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Forwards the POST request to the move method on the wrapped
 * resource
 *
 * @author brad
 */
public class MoveJsonResource extends JsonResource implements PostableResource {

    private static final Logger log = LoggerFactory.getLogger( MoveJsonResource.class );
    private final String host;
    private final ResourceFactory resourceFactory;
    private final MoveableResource wrapped;

    public MoveJsonResource( String host, MoveableResource copyableResource, ResourceFactory resourceFactory ) {
        super(copyableResource, Request.Method.COPY.code, null);
        this.host = host;
        this.wrapped = copyableResource;
        this.resourceFactory = resourceFactory;
    }
    @Override
    public String processForm( Map<String, String> parameters, Map<String, FileItem> files ) throws BadRequestException, NotAuthorizedException {
        String dest = parameters.get( "destination");
        if( dest == null ) {
            throw new BadRequestException(this, "The destination parameter is null");
        } else if (dest.trim().length() == 0 ) {
            throw new BadRequestException(this, "The destination parameter is empty");
        }
        Path pDest = Path.path( dest );
        if( pDest == null ) {
            throw new BadRequestException(this, "Couldnt parse the destination header, returned null from: " + dest);
        }
        String parentPath = "/";
        if( pDest.getParent() != null ) {
            parentPath = pDest.getParent().toString();
        }
        Resource rDestParent = resourceFactory.getResource( host, parentPath);
        if( rDestParent == null ) throw new BadRequestException( wrapped, "The destination parent does not exist");
        if(rDestParent instanceof CollectionResource ) {
            CollectionResource colDestParent = (CollectionResource) rDestParent;
            if( colDestParent.child( pDest.getName()) == null ) {
                try {
                    wrapped.moveTo( colDestParent, pDest.getName() );
                } catch( ConflictException ex ) {
                    log.warn( "Exception copying to: " + pDest.getName(), ex);
                    throw new BadRequestException( rDestParent, "conflict: " + ex.getMessage());
                }
                return null;
            } else {
                log.warn( "destination already exists: " + pDest.getName() + " in folder: " + colDestParent.getName());
                throw new BadRequestException( rDestParent, "File already exists");
            }
        } else {
            throw new BadRequestException( wrapped, "The destination parent is not a collection resource");
        }
    }

    public void sendContent( OutputStream out, Range range, Map<String, String> params, String contentType ) throws IOException, NotAuthorizedException, BadRequestException {
        // nothing to do
    }

    @Override
    public Method applicableMethod() {
        return Method.MOVE;
    }

}