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// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.plum.base;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.util.Locale;
import java.util.zip.GZIPOutputStream;

import javax.servlet.ServletOutputStream;
import javax.servlet.WriteListener;
import javax.servlet.http.HttpServletResponse;

import com.appslandia.common.base.MemoryStream;

/**
 *
 * @author Loc Ha
 *
 */
public class ContentResponseWrapper extends ResponseWrapper {

	final boolean allowSetHeaders;
	final MemoryStream content;
	final boolean gzipContent;

	private PrintWriter outWriter;
	private ServletOutputStream outStream;

	public ContentResponseWrapper(HttpServletResponse response, boolean allowSetHeaders, boolean gzipContent) {
		super(response);
		this.allowSetHeaders = allowSetHeaders;
		this.content = new MemoryStream();
		this.gzipContent = gzipContent;
	}

	public MemoryStream getContent() {
		return this.content;
	}

	public boolean isAllowSetHeaders() {
		return this.allowSetHeaders;
	}

	public boolean isGzipContent() {
		return this.gzipContent;
	}

	@Override
	public void finishWrapper() throws IOException {
		if (this.outWriter != null) {
			this.outWriter.close();

		} else if (this.outStream != null) {
			this.outStream.close();
		}
	}

	@Override
	public ServletOutputStream getOutputStream() throws IOException {
		if (this.outWriter != null) {
			throw new IllegalStateException("getWriter has been called on this response.");
		}
		if (this.outStream == null) {
			if (this.gzipContent) {
				this.outStream = new GZIPServletOutputStream();

				this.setHeader("Content-Encoding", "gzip");
			} else {
				this.outStream = new ServletOutputStreamImpl();
			}
		}
		return this.outStream;
	}

	@Override
	public PrintWriter getWriter() throws IOException {
		if (this.outStream != null) {
			throw new IllegalStateException("getOutputStream has been called on this response.");
		}
		if (this.outWriter == null) {
			if (this.gzipContent) {
				this.outWriter = new PrintWriter(new BufferedWriter(new OutputStreamWriter(new GZIPOutputStream(this.content), this.getCharacterEncoding())));

				this.setHeader("Content-Encoding", "gzip");
			} else {
				this.outWriter = new PrintWriter(new BufferedWriter(new OutputStreamWriter(this.content, this.getCharacterEncoding())));
			}
		}
		return this.outWriter;
	}

	@Override
	public void flushBuffer() throws IOException {
		if (this.outWriter != null) {
			this.outWriter.flush();

		} else if (this.outStream != null) {
			this.outStream.flush();
		}
	}

	@Override
	public void resetBuffer() {
		this.outWriter = null;
		this.outStream = null;
		this.content.reset();
	}

	@Override
	public void reset() {
		if (this.allowSetHeaders) {
			super.reset();
		}
		this.resetBuffer();
	}

	@Override
	public void setContentLength(int len) {
	}

	@Override
	public void setContentLengthLong(long len) {
	}

	@Override
	public void setContentType(String type) {
		if (this.allowSetHeaders) {
			super.setContentType(type);
		}
	}

	@Override
	public void setHeader(String name, String value) {
		if (this.allowSetHeaders) {
			super.setHeader(name, value);
		}
	}

	@Override
	public void setIntHeader(String name, int value) {
		if (this.allowSetHeaders) {
			super.setIntHeader(name, value);
		}
	}

	@Override
	public void setDateHeader(String name, long date) {
		if (this.allowSetHeaders) {
			super.setDateHeader(name, date);
		}
	}

	@Override
	public void addHeader(String name, String value) {
		if (this.allowSetHeaders) {
			super.addHeader(name, value);
		}
	}

	@Override
	public void addIntHeader(String name, int value) {
		if (this.allowSetHeaders) {
			super.addIntHeader(name, value);
		}
	}

	@Override
	public void addDateHeader(String name, long date) {
		if (this.allowSetHeaders) {
			super.addDateHeader(name, date);
		}
	}

	@Override
	public void setLocale(Locale loc) {
		if (this.allowSetHeaders) {
			super.setLocale(loc);
		}
	}

	@Override
	public void setCharacterEncoding(String charset) {
		if (this.allowSetHeaders) {
			super.setCharacterEncoding(charset);
		}
	}

	@Override
	public void setStatus(int sc) {
		if (this.allowSetHeaders) {
			super.setStatus(sc);
		}
	}

	@Deprecated
	@Override
	public void setStatus(int sc, String sm) {
		if (this.allowSetHeaders) {
			super.setStatus(sc, sm);
		}
	}

	@Override
	public void sendError(int sc) throws IOException {
		if (this.allowSetHeaders) {
			super.sendError(sc);
		}
	}

	@Override
	public void sendError(int sc, String msg) throws IOException {
		if (this.allowSetHeaders) {
			super.sendError(sc, msg);
		}
	}

	private class ServletOutputStreamImpl extends ServletOutputStream {

		@Override
		public void write(int b) throws IOException {
			content.write(b);
		}

		@Override
		public void write(byte[] b, int off, int len) throws IOException {
			content.write(b, off, len);
		}

		@Override
		public void write(byte[] b) throws IOException {
			content.write(b);
		}

		@Override
		public boolean isReady() {
			return false;
		}

		@Override
		public void setWriteListener(WriteListener writeListener) {
			throw new UnsupportedOperationException();
		}
	}

	private class GZIPServletOutputStream extends ServletOutputStream {

		final GZIPOutputStream gos;

		public GZIPServletOutputStream() throws IOException {
			this.gos = new GZIPOutputStream(content);
		}

		@Override
		public void write(int b) throws IOException {
			this.gos.write(b);
		}

		@Override
		public void write(byte[] b, int off, int len) throws IOException {
			this.gos.write(b, off, len);
		}

		@Override
		public void write(byte[] b) throws IOException {
			this.gos.write(b);
		}

		@Override
		public void flush() throws IOException {
			this.gos.flush();
		}

		@Override
		public void close() throws IOException {
			this.gos.close();
		}

		@Override
		public boolean isReady() {
			return false;
		}

		@Override
		public void setWriteListener(WriteListener writeListener) {
			throw new UnsupportedOperationException();
		}
	}
}