// Copyright 2005-2007 onetsoft.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.onetsoft.fastjsp;

import com.onetsoft.fastjsp.request.PageData;
import com.onetsoft.fastjsp.util.Constants;
import com.onetsoft.fastjsp.util.ResourceResolver;
import com.onetsoft.fastjsp.util.StringUtils;
import com.onetsoft.fastjsp.util.Util;
import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.SystemUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


/**
 * 缺省服務
 *
 * @author <a href="mailto:hgw@onetsoft.com">hgw</a>
 * @since 2.0
 */
public abstract class AbstractServicer implements Servicer {

    private final static String SCRITPS_PATH = "/com/onetsoft/fastjsp/resource/scripts";
    private static Map frameworkResources = new HashMap(1);  //Contains framework resources

    FastJspServlet servlet = null;
    HttpServletRequest request = null;
    HttpServletResponse response = null;

    /*
    HttpServletRequest requestFacade = null; 對WAS無效，返回始終是：com.ibm.ws.webcontainer.srt.SRTServletRequest@74e074e0 ，似乎WAS不支持
    HttpSevletRequestWrapper的實現。WAS是須實現：.IServletRequest 嗎？將來再測。 
    WAS Server forward后會更改request.getRequestURL()為實際路徑的url，
    如：http://www.example.com:9080/onet/onetforums/web/club/default/messages.jsp，與標準不一致。
    此參數因為當前  request.getRequestURL() 無法 facade ，不得不硬性實現為 page.getRequestURL() 以兼容WAS server！ 
    */
    String rawRequestedURL = null;

    Module module = null;         //current fastjsp web module
    String hostPath = null;         //e.g:"http://www.testsite.com:8080"
    String contextPath = null;    //e.g:"/onet"  or ""
    String servletContextPath = null;    //e.g:"/onet/forums"
    PageParamsImpl pageParams = null;

    PageModule[] layoutModules = null;
    PageModule defaultPageModule = null;

    StateURL stateURL = null;

    LinkPool linkPool=null;

    /**
     * Construct servicer
     *
     * @param servlet
     * @param request
     * @param response
     */
    public AbstractServicer(FastJspServlet servlet, HttpServletRequest request, HttpServletResponse response) {
        this.servlet = servlet;
        this.module = servlet.getModule();
        this.request = request;
        this.response = response;
        init();
    }

    private void init() {

        rawRequestedURL = request.getRequestURL().toString();
        this.hostPath = StringUtils.substringBeforeLast(rawRequestedURL, request.getRequestURI());
        this.contextPath = request.getContextPath();
        if (contextPath.length() == 1 && contextPath.charAt(0) == '/')
            contextPath = StringUtils.EMPTY;
        if (module.moduleServletPath == null)
            servletContextPath = contextPath;
        else
            servletContextPath = new StringBuffer().append(contextPath).append(request.getServletPath()).toString();

        if (servletContextPath.length() > 0 && servletContextPath.charAt(servletContextPath.length() - 1) == '/')
            servletContextPath = servletContextPath.substring(0, servletContextPath.length() - 1);

        stateURL = getURLState();


        /*    Debug.debug(" ----------- Context info begin ------------------------");
   Debug.debug("AbstractServicer.init() Line:96....hostPath:" + hostPath);
   Debug.debug("AbstractServicer.init() Line:97....contextPath:" + contextPath);
   Debug.debug("AbstractServicer.init() Line:98....servletContextPath:" + servletContextPath);
   Debug.debug("AbstractServicer.init() Line:99....module.urlExt:" + module.urlExt);
   Debug.debug("AbstractServicer.init() Line:99....raw contextPath:" + request.getContextPath());
   Debug.debug("AbstractServicer.init() Line:99....raw url:" + request.getRequestURL());
   Debug.debug("AbstractServicer.init() Line:99....raw uri:" + request.getRequestURI());
   Debug.debug("AbstractServicer.init() Line:100 ..raw servletPath:" + request.getServletPath());
   Debug.debug("AbstractServicer.init() Line:101 ..raw pathInfo:" + request.getPathInfo());
   Debug.debug(" ----------- Context info end ------------------------");*/

    }

    /**
     * 執行當前jsp頁面服務
     *
     * @throws ServletException
     * @throws IOException
     */
    protected void doService() throws ServletException, IOException {
        try {
            String pathinfo = getPathInfo(request);

            if (pathinfo == null || (pathinfo.length() == 1 && pathinfo.charAt(0) == '/') || pathinfo.endsWith(module.urlExt)
                    || pathinfo.indexOf('.') == -1  /*|| request.getServletPath().length() == 0*/) {

                /* 獲取當前布局 */
                layoutModules = getLayoutModules();
                if (layoutModules == null || layoutModules.length == 0) {
                    outputNoLayoutInfo(getNoLayoutInfo());
                    return;
                }

                defaultPageModule = getDefaultLayoutModule();
                if (defaultPageModule == null)
                    defaultPageModule = layoutModules[0];
                if (!ArrayUtils.contains(layoutModules, defaultPageModule)) {
                    outputNoLayoutInfo("Default layout\"" + defaultPageModule + "\" is not exists in the layoutModules!");
                    return;
                }

                /* 處理頁面 */
                processPageService(pathinfo);

            } else if (pathinfo.startsWith(StringUtils.RESOURCE_URL_PREFIX)) {
                renderFrameworkReources(pathinfo);
            } else {
                renderContextReources(pathinfo);
            }
        } catch (ServletException e) {
            throw e;
        } catch (IOException e) {
            throw e;
        } catch (Exception e) {
            handleException(e);
        }
    }

    private String getPathInfo(HttpServletRequest request) {
        String uri = request.getRequestURI();
        uri = StringUtils.substringAfter(uri, contextPath);
        String r = null;
        if (module.moduleServletPath == null) {
            r = uri;
        } else {
            if (uri != null && uri.length() > module.moduleServletPath.length()) {
                r = uri.substring(module.moduleServletPath.length());
            }
        }
       /* try {
       PaeeParamsImpl中已經基于 URLDecoder.decode(s,s)解碼，這里不再需要了。
            if (r != null)
                r = new String(r.getBytes(Constants.ISO_8859_1), module.charset);       //編碼中文等亞洲雙字節url參數
        } catch (UnsupportedEncodingException e) {
            throw new ApplicationRuntimeException(e);
        }*/
        return r;
    }

    protected String getNoLayoutInfo() {
        return "<b>NO WEB MODULES AVAILABLE</b>";
    }

    private void outputNoLayoutInfo(String info) {
        Writer out = null;
        try {
            out = new OutputStreamWriter(response.getOutputStream(), Constants.UTF_8);
            out.write(info);
            out.close();
            out = null;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (out != null)
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
        }
    }

    private void processPageService(String pathInfo) throws IOException, ServletException {

      /*
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);*/

        AbstractPageService service = null;
        try {
            pageParams = new PageParamsImpl(this);
            pathInfo = stateURL.decodeBeforeDataBuild(pathInfo);
            pageParams.init(pathInfo);
            if (pageParams.layoutModule == Util.EMPTY_PAGE_MODULE) {
                /*if (getLayoutModules() == null || getLayoutModules().length == 0) {
                    outputNoLayoutInfo(getNoLayoutInfo());
                } else {*/
                response.sendError(HttpServletResponse.SC_NOT_FOUND, "NO LAYOUT FOUND!");
                /*   }*/
                return;
            } else if (pageParams.pageClass == null) {
                response.sendError(HttpServletResponse.SC_NOT_FOUND, "NO PAGE CLASS FOUND:" + pageParams.pageClassStr);
                return;
            }