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/*
 * Copyright 2015-2017 GenerallyCloud.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.generallycloud.baseio.codec.http11;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import com.generallycloud.baseio.buffer.ByteBuf;
import com.generallycloud.baseio.buffer.ByteBufAllocator;
import com.generallycloud.baseio.codec.http11.future.Cookie;
import com.generallycloud.baseio.codec.http11.future.HttpReadFuture;
import com.generallycloud.baseio.protocol.ChannelReadFuture;
import com.generallycloud.baseio.protocol.ChannelWriteFuture;
import com.generallycloud.baseio.protocol.ChannelWriteFutureImpl;

//FIXME post
public class ClientHTTPProtocolEncoder extends AbstractHttpProtocolEncoder {
	
	private static final byte [] PROTOCOL = " HTTP/1.1\r\n".getBytes();
	private static final byte [] COOKIE = "Cookie:".getBytes();
	private static final byte SEMICOLON = ';';

	@Override
	public ChannelWriteFuture encode(ByteBufAllocator allocator, ChannelReadFuture future) throws IOException {

		HttpReadFuture f = (HttpReadFuture) future;

		ByteBuf buf = allocator.allocate(256);
		buf.put(f.getMethod().getBytes());
		buf.putByte(SPACE);
		buf.put(getRequestURI(f).getBytes());
		buf.put(PROTOCOL);
		
		writeHeaders(f, buf);

		List cookieList = f.getCookieList();

		if (cookieList != null && cookieList.size() > 0) {
			
			buf.put(COOKIE);
			for (Cookie c : cookieList) {
				writeBuf(buf, c.getName().getBytes());
				writeBuf(buf, COLON);
				writeBuf(buf, c.getValue().getBytes());
				writeBuf(buf, SEMICOLON);
			}
			
			buf.position(buf.position() - 1);
		}

		buf.put(RN);

		return new ChannelWriteFutureImpl(f, buf.flip());
	}

	private String getRequestURI(HttpReadFuture future) {
		
		Map params = future.getRequestParams();
		
		if (params == null) {
			return future.getRequestURL();
		}

		String url = future.getRequestURI();

		StringBuilder u = new StringBuilder(url);

		u.append("?");

		Set> ps = params.entrySet();
		
		for (Entry p : ps) {
			u.append(p.getKey());
			u.append("=");
			u.append(p.getValue());
			u.append("&");
		}

		return u.toString();
	}
}