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package com.textrecruit.ustackserverapi;

import static org.jboss.netty.handler.codec.http.HttpHeaders.Names.CACHE_CONTROL;
import static org.jboss.netty.handler.codec.http.HttpHeaders.setContentLength;
import static org.jboss.netty.handler.codec.http.HttpVersion.HTTP_1_1;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.textrecruit.ustackserverapi.params.ParamNames;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.handler.codec.http.Cookie;
import org.jboss.netty.handler.codec.http.CookieEncoder;
import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
import org.jboss.netty.handler.codec.http.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpResponse;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.netty.util.CharsetUtil;

import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.util.JSON;

public class APIResponse {

    static Logger           		logger               	= Logger.getLogger(APIResponse.class);

	private static final Map legalOrigins = new HashMap();
	private static final List legalOriginsEndsWith = new ArrayList<>();
	public static void addCORSOrigin(String origin) {
		legalOrigins.put(origin, Boolean.TRUE);
	}

	/**
	 * If the origin header value ends with the provided value, allow CORS
	 * @param origin
	 */
	public static void addEndsWithCORSOrigin(String origin) {
		legalOriginsEndsWith.add(origin);
	}

	public static boolean isCORSAllowed(String originHeader) {

		if (StringUtils.isEmpty(originHeader)) {
			return false;
		}

		if (legalOrigins.get(originHeader) != null) {
			return true;
		}

		for (String wildcard : legalOriginsEndsWith) {
			if (originHeader.endsWith(wildcard)) {
				return true;
			}
		}

		return false;

	}

    private static String AccessControlAllowOrigin;
	public static final String ContentTypeTextXML = "text/xml";
	public static final String ContentTypeTextHTML = "text/html";
	public static final String ContentTypeTextPlain = "text/plain";
	public static final String ContentTypeJSON = "application/json";
	public static final String ContentTypeJSONP = "application/javascript";
	public static final String ContentTypeCalendar = "text/calendar";

	public static String getAccessControlAllowOrigin() {
		return AccessControlAllowOrigin;
	}

	public static void setAccessControlAllowOrigin(String accessControlAllowOrigin) {
		AccessControlAllowOrigin = accessControlAllowOrigin;
	}

	private static void addHeaders(Channel channel, HttpRequest req, HttpResponse res, String jsonpFunction)
	{
		if (req != null && !req.getMethod().equals(HttpMethod.OPTIONS)) {
			res.addHeader(CACHE_CONTROL, "no-cache, no-store");
			res.addHeader("X-Content-Type-Options", "nosniff");
		}
		if (jsonpFunction != null)
		{
			res.setHeader("Content-type", ContentTypeJSONP);
		}
		else if (AccessControlAllowOrigin != null)	
			res.setHeader("Access-Control-Allow-Origin", AccessControlAllowOrigin);
		else if (req != null)
		{
			String originHeader = req.getHeader("Origin");
			if (isCORSAllowed(originHeader))
				res.setHeader("Access-Control-Allow-Origin", originHeader);
		}

		res.setHeader("Vary", "Origin");
		if (channel.getAttachment() instanceof Long)
			res.setHeader("X-Processing-Time", System.currentTimeMillis() - (Long)channel.getAttachment());
	}
	
	public static void httpOk(Channel channel, String text, String contentType, CallParameters params, Cookie[] cookie, HttpRequest req, boolean enableCORS)
	{
		String jsonpFunction = params.get(ParamNames.json_callback);
		HttpResponse res = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.OK);
		if (req != null && !req.getMethod().equals(HttpMethod.OPTIONS)) {
			res.setHeader("Content-type", contentType);
		} else if (req == null) {
			res.setHeader("Content-type", contentType);
		}

		if (cookie != null)
		{
			for (int i = 0; i < cookie.length; i++)
			{
				CookieEncoder cookieEncoder = new CookieEncoder(true);
				cookieEncoder.addCookie(cookie[i]);
				res.addHeader("Set-Cookie", cookieEncoder.encode());
			}
		}
		
		addHeaders(channel, req, res, jsonpFunction);
		if (jsonpFunction != null)
			text = handleJSONPResponse(res, jsonpFunction, text, params);

		if ("INVALID".equals(text)) {
			res = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.BAD_REQUEST);
			setContentLength(res, res.getContent().readableBytes());
                	channel.write(res);
			return;
		}

		if (res.getHeader("Access-Control-Allow-Origin") == null)
		{
			String originHeader = req == null ? null : req.getHeader("Origin");
			if (originHeader != null) {
				if (enableCORS || isCORSAllowed(originHeader)) {
					res.setHeader("Access-Control-Allow-Origin", originHeader);
				}
			}
		}
		if (req != null && req.getMethod().equals(HttpMethod.OPTIONS)) {
			if (req.getHeader("Access-Control-Request-Headers") != null) {
				res.setHeader("Access-Control-Allow-Headers", req.getHeader("Access-Control-Request-Headers"));
			}
			if (req.getHeader("Access-Control-Request-Method") != null) {
				res.setHeader("Access-Control-Allow-Methods", req.getHeader("Access-Control-Request-Method"));
			}
			res.setContent(ChannelBuffers.copiedBuffer("", CharsetUtil.UTF_8));
			setContentLength(res, 0);
			channel.write(res);
			return;
		}

		res.setContent(ChannelBuffers.copiedBuffer(text, CharsetUtil.UTF_8));
		setContentLength(res, res.getContent().readableBytes());
		channel.write(res);
	}

	/**
	 * Inject 'httpResponseCode' into the stream if it's 400 or greater
	 * 
	 * This will let the client process the data
	 * 
	 * @param res
	 * @param jsonpFunction
	 * @param text
	 * @return
	 */
	private static String handleJSONPResponse(HttpResponse res, String jsonpFunction, String text, CallParameters params)
	{
		if (!jsonpFunction.matches("angular.callbacks._(\\w+)")) {
			return "INVALID";
		}

		if (!"false".equals(params.get(ParamNames.json_response_code_inject)) && res.getStatus().getCode() >= 400) // respond w/ a 200 and jam in the error response code so the client side can process
		{
			text = String.format("{ \"httpResponseCode\" : %d,%s", res.getStatus().getCode(), text.substring(1));
			res.setStatus(HttpResponseStatus.OK);
		}
		
		res.setHeader("Content-type", "text/javascript");
		
		StringBuffer json = new StringBuffer();
		json.append(jsonpFunction);
		json.append("(").append(text).append(");");
		return json.toString();
	}
	
	public static void httpResponse(Channel channel, String text, String contentType, HttpRequest req, HttpResponseStatus status, CallParameters params)
	{
		String jsonpFunction = params.get(ParamNames.json_callback);
		HttpResponse res = new DefaultHttpResponse(HTTP_1_1, status);
		res.setHeader("Content-type", contentType);
		addHeaders(channel, req, res, jsonpFunction);
		if (jsonpFunction != null)
			text = handleJSONPResponse(res, jsonpFunction, text, params);
		
		res.setContent(ChannelBuffers.copiedBuffer(text, CharsetUtil.UTF_8));
		setContentLength(res, res.getContent().readableBytes());
		channel.write(res);
	}

	public static void httpError(Channel channel, String text, String contentType, HttpRequest req, CallParameters params)
	{
		httpError(channel, text, contentType, req, HttpResponseStatus.BAD_REQUEST, params);
	}

	public static void httpError(Channel channel, String text, String contentType, HttpRequest req, HttpResponseStatus status, CallParameters params)
	{
		httpError(channel, text, contentType, HttpResponseStatus.BAD_REQUEST, params, req, true);
	}
	
	public static void httpError(Channel channel, String text, String contentType, HttpResponseStatus status, CallParameters params, HttpRequest req, boolean enableCORS)
	{
		String jsonpFunction = params.get(ParamNames.json_callback);
		logger.warn(String.format("Returning API Error [%d | %s] => %s", status.getCode(), channel.getRemoteAddress(), text));
		HttpResponse res = new DefaultHttpResponse(HTTP_1_1, status);
		res.setHeader("Content-type", contentType);
		addHeaders(channel, req, res, jsonpFunction);
		if (jsonpFunction != null)
			text = handleJSONPResponse(res, jsonpFunction, text, params);
		
		res.setContent(ChannelBuffers.copiedBuffer(text, CharsetUtil.UTF_8));
		setContentLength(res, res.getContent().readableBytes());
		
		if (enableCORS && res != null && req != null)
		{
			if (res.getHeader("Access-Control-Allow-Origin") == null && req.getHeader("Origin") != null)
				res.setHeader("Access-Control-Allow-Origin", req.getHeader("Origin"));
			if (req.getMethod().equals(HttpMethod.OPTIONS) && req.getHeader("Access-Control-Request-Headers") != null)
				res.setHeader("Access-Control-Allow-Headers", req.getHeader("Access-Control-Request-Headers"));
		}

		
		channel.write(res);
	}

	public static void httpOk(Channel channel, DBObject dbObject, HttpRequest req, CallParameters params, Cookie[] cookies)
	{
		httpOk(channel, JSON.serialize(dbObject), ContentTypeJSON, params, cookies, req, false);
	}
	
	public static void httpOk(Channel channel, DBObject dbObject, HttpRequest req, CallParameters params)
	{
		httpOk(channel, dbObject, req, params, null);
	}
	
	public static void httpResponse(Channel channel, DBObject dbObject, HttpRequest req, HttpResponseStatus status, CallParameters params)
	{
		httpResponse(channel, JSON.serialize(dbObject), ContentTypeJSON, req, status, params);
	}
	
	public static void httpError(Channel channel, DBObject dbObject, HttpRequest req, CallParameters params)
	{
		httpError(channel, JSON.serialize(dbObject), ContentTypeJSON, req, params);
	}

	public static void httpError(Channel channel, DBObject dbObject, HttpRequest req, HttpResponseStatus status, CallParameters params)
	{
		httpError(channel, JSON.serialize(dbObject), ContentTypeJSON, req, status, params);
	}

	public static DBObject getResponseObject(String status)
	{
		return getResponseObject(status, (String)null);
	}
	
	public static DBObject getResponseObject(String status, String msg)
	{
		return getResponseObject(status, null, msg);
	}

	public static DBObject getResponseObject(String status, DBObject ret)
	{
		return getResponseObject(status, ret, null);
	}

	public static DBObject getResponseObject(String status, DBObject ret, String msg)
	{
		DBObject obj = new BasicDBObject();
		DBObject result = new BasicDBObject();
		obj.put("apiResult", result);
		result.put("status", status);
		if (msg != null)
			result.put("message", msg);
		if (ret != null)	
			obj.putAll(ret);

		return obj;
	}
	
	public static DBObject success(DBObject ret) {
		return getResponseObject("SUCCESS", ret);
	}
	
	public static DBObject error(DBObject ret) {
		return getResponseObject("ERROR", ret);
	}

	public static DBObject error(DBObject ret, String msg) {
		return getResponseObject("ERROR", ret, msg);
	}
	
	public static DBObject success(String msg) {
		return getResponseObject("SUCCESS", msg);
	}
	
	public static DBObject success() {
		return getResponseObject("SUCCESS", (String)null);
	}
	
	public static DBObject error(String msg) {
		return getResponseObject("ERROR", msg);
	}
	

}