/*
 * Copyright (C) 2013 Square, Inc.
 *
 * 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 retrofit.mime;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;

public final class FormUrlEncodedTypedOutput implements TypedOutput {
    final ByteArrayOutputStream content = new ByteArrayOutputStream();

    public void addField(String name, String value) {
        if (name == null) {
            throw new NullPointerException("name");
        }
        if (value == null) {
            throw new NullPointerException("value");
        }
        if (content.size() > 0) {
            content.write('&');
        }
        try {
            name = URLEncoder.encode(name, "UTF-8");
            value = URLEncoder.encode(value, "UTF-8");

            content.write(name.getBytes("UTF-8"));
            content.write('=');
            content.write(value.getBytes("UTF-8"));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public String fileName() {
        return null;
    }

    @Override
    public String mimeType() {
        return "application/x-www-form-urlencoded; charset=UTF-8";
    }

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

    @Override
    public void writeTo(OutputStream out) throws IOException {
        out.write(content.toByteArray());
    }
}