/*
 * Copyright (c) 2010-2015, b3log.org
 *
 * 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 org.b3log.solo.processor.console;


import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.b3log.latke.Keys;
import org.b3log.latke.Latkes;
import org.b3log.latke.logging.Level;
import org.b3log.latke.logging.Logger;
import org.b3log.latke.service.LangPropsService;
import org.b3log.latke.servlet.HTTPRequestContext;
import org.b3log.latke.servlet.HTTPRequestMethod;
import org.b3log.latke.servlet.annotation.RequestProcessing;
import org.b3log.latke.servlet.annotation.RequestProcessor;
import org.b3log.latke.servlet.renderer.JSONRenderer;
import org.b3log.solo.model.Common;
import org.b3log.solo.service.LinkMgmtService;
import org.b3log.solo.service.LinkQueryService;
import org.b3log.solo.util.QueryResults;
import org.b3log.latke.util.Requests;
import org.b3log.solo.service.UserQueryService;
import org.json.JSONObject;


/**
 * Link console request processing.
 *
 * @author <a href="http://88250.b3log.org">Liang Ding</a>
 * @version 1.0.0.3, Aug 9, 2012
 * @since 0.4.0
 */
@RequestProcessor
public class LinkConsole {

    /**
     * Logger.
     */
    private static final Logger LOGGER = Logger.getLogger(LinkConsole.class.getName());

    /**
     * User query service.
     */
    @Inject
    private UserQueryService userQueryService;

    /**
     * Link query service.
     */
    @Inject
    private LinkQueryService linkQueryService;

    /**
     * Link management service.
     */
    @Inject
    private LinkMgmtService linkMgmtService;

    /**
     * Language service.
     */
    @Inject
    private LangPropsService langPropsService;

    /**
     * Removes a link by the specified request.
     * 
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "msg": ""
     * }
     * </pre>
     * </p>
     *
     * @param request the specified http servlet request
     * @param response the specified http servlet response
     * @param context the specified http request context
     * @throws Exception exception
     */
    @RequestProcessing(value = "/console/link/*", method = HTTPRequestMethod.DELETE)
    public void removeLink(final HttpServletRequest request, final HttpServletResponse response, final HTTPRequestContext context)
        throws Exception {
        if (!userQueryService.isAdminLoggedIn(request)) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }

        final JSONRenderer renderer = new JSONRenderer();

        context.setRenderer(renderer);

        final JSONObject jsonObject = new JSONObject();

        renderer.setJSONObject(jsonObject);

        try {
            final String linkId = request.getRequestURI().substring((Latkes.getContextPath() + "/console/link/").length());

            linkMgmtService.removeLink(linkId);

            jsonObject.put(Keys.STATUS_CODE, true);
            jsonObject.put(Keys.MSG, langPropsService.get("removeSuccLabel"));
        } catch (final Exception e) {
            LOGGER.log(Level.ERROR, e.getMessage(), e);

            jsonObject.put(Keys.STATUS_CODE, false);
            jsonObject.put(Keys.MSG, langPropsService.get("removeFailLabel"));
        }
    }

    /**
     * Updates a link by the specified request.
     * 
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "msg": ""
     * }
     * </pre>
     * </p>
     *
     * @param request the specified http servlet request, for example,
     * <pre>
     * {
     *     "link": {
     *         "oId": "",
     *         "linkTitle": "",
     *         "linkAddress": "",
     *         "linkDescription": ""
     *     }
     * }, see {@link org.b3log.solo.model.Link} for more details
     * </pre>
     * @param context the specified http request context
     * @param response the specified http servlet response
     * @throws Exception exception
     */
    @RequestProcessing(value = "/console/link/", method = HTTPRequestMethod.PUT)
    public void updateLink(final HttpServletRequest request, final HttpServletResponse response, final HTTPRequestContext context)
        throws Exception {
        if (!userQueryService.isAdminLoggedIn(request)) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }

        final JSONRenderer renderer = new JSONRenderer();

        context.setRenderer(renderer);

        final JSONObject ret = new JSONObject();

        try {
            final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, response);

            linkMgmtService.updateLink(requestJSONObject);

            ret.put(Keys.STATUS_CODE, true);
            ret.put(Keys.MSG, langPropsService.get("updateSuccLabel"));

            renderer.setJSONObject(ret);
        } catch (final Exception e) {
            LOGGER.log(Level.ERROR, e.getMessage(), e);

            final JSONObject jsonObject = QueryResults.defaultResult();

            renderer.setJSONObject(jsonObject);
            jsonObject.put(Keys.MSG, langPropsService.get("updateFailLabel"));
        }
    }

    /**
     * Changes a link order by the specified link id and direction.
     * 
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "msg": ""
     * }
     * </pre>
     * </p>
     *
     * @param request the specified http servlet request, for example,
     * <pre>
     * {
     *     "oId": "",
     *     "direction": "" // "up"/"down"
     * }
     * </pre>
     * @param response the specified http servlet response
     * @param context the specified http request context
     * @throws Exception exception 
     */
    @RequestProcessing(value = "/console/link/order/", method = HTTPRequestMethod.PUT)
    public void changeOrder(final HttpServletRequest request,
        final HttpServletResponse response,
        final HTTPRequestContext context)
        throws Exception {
        if (!userQueryService.isAdminLoggedIn(request)) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }

        final JSONRenderer renderer = new JSONRenderer();

        context.setRenderer(renderer);

        final JSONObject ret = new JSONObject();

        try {
            final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, response);
            final String linkId = requestJSONObject.getString(Keys.OBJECT_ID);
            final String direction = requestJSONObject.getString(Common.DIRECTION);

            linkMgmtService.changeOrder(linkId, direction);

            ret.put(Keys.STATUS_CODE, true);
            ret.put(Keys.MSG, langPropsService.get("updateSuccLabel"));

            renderer.setJSONObject(ret);
        } catch (final Exception e) {
            LOGGER.log(Level.ERROR, e.getMessage(), e);

            final JSONObject jsonObject = QueryResults.defaultResult();

            renderer.setJSONObject(jsonObject);
            jsonObject.put(Keys.MSG, langPropsService.get("updateFailLabel"));
        }
    }

    /**
     * Adds a link with the specified request.
     * 
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "oId": "", // Generated link id
     *     "msg": ""
     * }
     * </pre>
     * </p>
     * 
     * @param request the specified http servlet request, for example,
     * <pre>
     * {
     *     "link": {
     *         "linkTitle": "",
     *         "linkAddress": "",
     *         "linkDescription": ""
     *     }
     * }
     * </pre>
     * @param response the specified http servlet response
     * @param context the specified http request context
     * @throws Exception exception
     */
    @RequestProcessing(value = "/console/link/", method = HTTPRequestMethod.POST)
    public void addLink(final HttpServletRequest request, final HttpServletResponse response, final HTTPRequestContext context)
        throws Exception {
        if (!userQueryService.isAdminLoggedIn(request)) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }

        final JSONRenderer renderer = new JSONRenderer();

        context.setRenderer(renderer);

        final JSONObject ret = new JSONObject();

        try {
            final JSONObject requestJSONObject = Requests.parseRequestJSONObject(request, response);

            final String linkId = linkMgmtService.addLink(requestJSONObject);

            ret.put(Keys.OBJECT_ID, linkId);
            ret.put(Keys.MSG, langPropsService.get("addSuccLabel"));
            ret.put(Keys.STATUS_CODE, true);

            renderer.setJSONObject(ret);
        } catch (final Exception e) {
            LOGGER.log(Level.ERROR, e.getMessage(), e);

            final JSONObject jsonObject = QueryResults.defaultResult();

            renderer.setJSONObject(jsonObject);
            jsonObject.put(Keys.MSG, langPropsService.get("addFailLabel"));
        }
    }

    /**
     * Gets links by the specified request.
     * 
     * <p>
     * The request URI contains the pagination arguments. For example, the 
     * request URI is /console/links/1/10/20, means the current page is 1, the
     * page size is 10, and the window size is 20.
     * </p>
     * 
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "pagination": {
     *         "paginationPageCount": 100,
     *         "paginationPageNums": [1, 2, 3, 4, 5]
     *     },
     *     "links": [{
     *         "oId": "",
     *         "linkTitle": "",
     *         "linkAddress": "",
     *         "linkDescription": ""
     *      }, ....]
     * }
     * </pre>
     * </p>
     *
     * @param request the specified http servlet request
     * @param response the specified http servlet response
     * @param context the specified http request context
     * @throws Exception exception 
     */
    @RequestProcessing(value = "/console/links/*/*/*"/* Requests.PAGINATION_PATH_PATTERN */,
        method = HTTPRequestMethod.GET)
    public void getLinks(final HttpServletRequest request,
        final HttpServletResponse response,
        final HTTPRequestContext context) throws Exception {
        if (!userQueryService.isLoggedIn(request, response)) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }

        final JSONRenderer renderer = new JSONRenderer();

        context.setRenderer(renderer);

        try {
            final String requestURI = request.getRequestURI();
            final String path = requestURI.substring((Latkes.getContextPath() + "/console/links/").length());

            final JSONObject requestJSONObject = Requests.buildPaginationRequest(path);

            final JSONObject result = linkQueryService.getLinks(requestJSONObject);

            result.put(Keys.STATUS_CODE, true);

            renderer.setJSONObject(result);
        } catch (final Exception e) {
            LOGGER.log(Level.ERROR, e.getMessage(), e);

            final JSONObject jsonObject = QueryResults.defaultResult();

            renderer.setJSONObject(jsonObject);
            jsonObject.put(Keys.MSG, langPropsService.get("getFailLabel"));
        }
    }

    /**
     * Gets the file with the specified request.
     * 
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "link": {
     *         "oId": "",
     *         "linkTitle": "",
     *         "linkAddress": "",
     *         "linkDescription": ""
     *     }
     * }
     * </pre>
     * </p>
     * 
     * @param request the specified http servlet request
     * @param response the specified http servlet response
     * @param context the specified http request context
     * @throws Exception exception
     */
    @RequestProcessing(value = "/console/link/*", method = HTTPRequestMethod.GET)
    public void getLink(final HttpServletRequest request, final HttpServletResponse response, final HTTPRequestContext context)
        throws Exception {
        if (!userQueryService.isLoggedIn(request, response)) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }

        final JSONRenderer renderer = new JSONRenderer();

        context.setRenderer(renderer);

        try {
            final String requestURI = request.getRequestURI();
            final String linkId = requestURI.substring((Latkes.getContextPath() + "/console/link/").length());

            final JSONObject result = linkQueryService.getLink(linkId);

            if (null == result) {
                renderer.setJSONObject(QueryResults.defaultResult());

                return;
            }

            renderer.setJSONObject(result);
            result.put(Keys.STATUS_CODE, true);
        } catch (final Exception e) {
            LOGGER.log(Level.ERROR, e.getMessage(), e);

            final JSONObject jsonObject = QueryResults.defaultResult();

            renderer.setJSONObject(jsonObject);
            jsonObject.put(Keys.MSG, langPropsService.get("getFailLabel"));
        }
    }
}
