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/*
 * Copyright (C) 2011 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.http.multipart;

import com.github.tomakehurst.wiremock.common.Exceptions;
import com.github.tomakehurst.wiremock.http.HttpHeader;
import com.github.tomakehurst.wiremock.http.HttpHeaders;
import com.github.tomakehurst.wiremock.http.Request;
import com.google.common.collect.Lists;
import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.List;

import static com.github.tomakehurst.wiremock.common.Exceptions.throwUnchecked;
import static com.github.tomakehurst.wiremock.http.multipart.FileItemPartAdapter.TO_PARTS;

public class PartParser {

    @SuppressWarnings("unchecked")
    public static Collection parseFrom(Request request) {
        FileItemFactory fileItemFactory = new DiskFileItemFactory(
                Integer.MAX_VALUE,
                new File(System.getProperty("java.io.tmpdir"))
        );

        HttpHeaders headers = request.getHeaders();
        ByteArrayUploadContext uploadContext = new ByteArrayUploadContext(
                request.getBody(),
                headerValueOrNull("Content-Encoding", headers),
                headers.getContentTypeHeader().firstValue()
        );

        FileUpload upload = new FileUpload(fileItemFactory);

        try {
            List items = upload.parseRequest(uploadContext);
            return Lists.transform(items, TO_PARTS);
        } catch (FileUploadException e) {
            return throwUnchecked(e, Collection.class);
        }
    }

    private static String headerValueOrNull(String key, HttpHeaders httpHeaders) {
        HttpHeader header = httpHeaders.getHeader(key);
        return header.isPresent() ? header.firstValue() : null;
    }

    public static class ByteArrayUploadContext implements UploadContext {

        private final byte[] content;
        private final String encoding;
        private final String contentType;

        public ByteArrayUploadContext(byte[] content, String encoding, String contentType) {
            this.content = content;
            this.encoding = encoding;
            this.contentType = contentType;
        }

        @Override
        public long contentLength() {
            return content.length;
        }

        @Override
        public String getCharacterEncoding() {
            return encoding;
        }

        @Override
        public String getContentType() {
            return contentType;
        }

        @Override
        public int getContentLength() {
            return content.length;
        }

        @Override
        public InputStream getInputStream() throws IOException {
            return new ByteArrayInputStream(content);
        }
    }
}