/*
 * Solo - A small and beautiful blogging system written in Java.
 * Copyright (c) 2010-present, b3log.org
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package org.b3log.solo.processor.console;

import org.apache.commons.lang.StringEscapeUtils;
import org.b3log.latke.Keys;
import org.b3log.latke.Latkes;
import org.b3log.latke.ioc.Inject;
import org.b3log.latke.logging.Level;
import org.b3log.latke.logging.Logger;
import org.b3log.latke.service.LangPropsService;
import org.b3log.latke.servlet.RequestContext;
import org.b3log.latke.servlet.annotation.Before;
import org.b3log.latke.servlet.annotation.RequestProcessor;
import org.b3log.latke.servlet.renderer.JsonRenderer;
import org.b3log.solo.model.Common;
import org.b3log.solo.model.Link;
import org.b3log.solo.service.LinkMgmtService;
import org.b3log.solo.service.LinkQueryService;
import org.b3log.solo.util.Solos;
import org.json.JSONArray;
import org.json.JSONObject;

/**
 * Link console request processing.
 *
 * @author <a href="http://88250.b3log.org">Liang Ding</a>
 * @version 1.0.1.4, Dec 11, 2018
 * @since 0.4.0
 */
@RequestProcessor
@Before(ConsoleAdminAuthAdvice.class)
public class LinkConsole {

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

    /**
     * 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 context the specified request context
     */
    public void removeLink(final RequestContext context) {
        final JsonRenderer renderer = new JsonRenderer();
        context.setRenderer(renderer);
        final JSONObject jsonObject = new JSONObject();
        renderer.setJSONObject(jsonObject);

        try {
            final String linkId = context.pathVar("id");
            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>
     * Request json:
     * <pre>
     * {
     *     "link": {
     *         "oId": "",
     *         "linkTitle": "",
     *         "linkAddress": "",
     *         "linkDescription": ""
     *     }
     * }
     * </pre>
     * </p>
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "msg": ""
     * }
     * </pre>
     * </p>
     *
     * @param context the specified request context
     */
    public void updateLink(final RequestContext context) {
        final JsonRenderer renderer = new JsonRenderer();
        context.setRenderer(renderer);
        final JSONObject ret = new JSONObject();

        try {
            final JSONObject requestJSON = context.requestJSON();
            linkMgmtService.updateLink(requestJSON);

            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 = new JSONObject().put(Keys.STATUS_CODE, false);
            renderer.setJSONObject(jsonObject);
            jsonObject.put(Keys.MSG, langPropsService.get("updateFailLabel"));
        }
    }

    /**
     * Changes a link order by the specified link id and direction.
     * <p>
     * Request json:
     * <pre>
     * {
     *     "oId": "",
     *     "direction": "" // "up"/"down"
     * }
     * </pre>
     * </p>
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "msg": ""
     * }
     * </pre>
     * </p>
     *
     * @param context the specified request context
     */
    public void changeOrder(final RequestContext context) {
        final JsonRenderer renderer = new JsonRenderer();
        context.setRenderer(renderer);
        final JSONObject ret = new JSONObject();

        try {
            final JSONObject requestJSON = context.requestJSON();
            final String linkId = requestJSON.getString(Keys.OBJECT_ID);
            final String direction = requestJSON.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 = new JSONObject().put(Keys.STATUS_CODE, false);
            renderer.setJSONObject(jsonObject);
            jsonObject.put(Keys.MSG, langPropsService.get("updateFailLabel"));
        }
    }

    /**
     * Adds a link with the specified request.
     * <p>
     * <pre>
     * {
     *     "link": {
     *         "linkTitle": "",
     *         "linkAddress": "",
     *         "linkDescription": ""
     *     }
     * }
     * </pre>
     * </p>
     * <p>
     * Renders the response with a json object, for example,
     * <pre>
     * {
     *     "sc": boolean,
     *     "oId": "", // Generated link id
     *     "msg": ""
     * }
     * </pre>
     * </p>
     *
     * @param context the specified request context
     */
    public void addLink(final RequestContext context) {
        final JsonRenderer renderer = new JsonRenderer();
        context.setRenderer(renderer);
        final JSONObject ret = new JSONObject();

        try {
            final JSONObject requestJSON = context.requestJSON();
            final String linkId = linkMgmtService.addLink(requestJSON);

            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 = new JSONObject().put(Keys.STATUS_CODE, false);
            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 context the specified request context
     */
    public void getLinks(final RequestContext context) {
        final JsonRenderer renderer = new JsonRenderer();
        context.setRenderer(renderer);

        try {
            final String requestURI = context.requestURI();
            final String path = requestURI.substring((Latkes.getContextPath() + "/console/links/").length());
            final JSONObject requestJSONObject = Solos.buildPaginationRequest(path);
            final JSONObject result = linkQueryService.getLinks(requestJSONObject);
            result.put(Keys.STATUS_CODE, true);
            renderer.setJSONObject(result);

            final JSONArray links = result.optJSONArray(Link.LINKS);
            for (int i = 0; i < links.length(); i++) {
                final JSONObject link = links.optJSONObject(i);
                String title = link.optString(Link.LINK_TITLE);
                title = StringEscapeUtils.escapeXml(title);
                link.put(Link.LINK_TITLE, title);
            }
        } catch (final Exception e) {
            LOGGER.log(Level.ERROR, e.getMessage(), e);

            final JSONObject jsonObject = new JSONObject().put(Keys.STATUS_CODE, false);
            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 context the specified request context
     */
    public void getLink(final RequestContext context) {
        final JsonRenderer renderer = new JsonRenderer();
        context.setRenderer(renderer);

        try {
            final String linkId = context.pathVar("id");
            final JSONObject result = linkQueryService.getLink(linkId);
            if (null == result) {
                renderer.setJSONObject(new JSONObject().put(Keys.STATUS_CODE, false));

                return;
            }

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

            final JSONObject jsonObject = new JSONObject().put(Keys.STATUS_CODE, false);
            renderer.setJSONObject(jsonObject);
            jsonObject.put(Keys.MSG, langPropsService.get("getFailLabel"));
        }
    }
}
