/**
 * Copyright 2015 LinkedIn Corp. All rights reserved.
 *
 * 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.
 */
package controllers.api.v1;

import com.fasterxml.jackson.databind.node.ObjectNode;
import dao.SearchDAO;
import java.util.List;
import org.apache.commons.lang3.math.NumberUtils;
import play.Play;
import play.cache.Cache;
import play.libs.Json;
import play.mvc.Controller;
import play.mvc.Result;
import play.Logger;

import static org.apache.commons.lang3.StringUtils.isNotBlank;
import static org.apache.commons.lang3.StringUtils.isBlank;


public class Search extends Controller
{
    private static final String AUTOCOMPLETE_ALL_KEY = "autocomplete.all";
    private static final String AUTOCOMPLETE_DATASET_KEY = "autocomplete.dataset";
    private static final String AUTOCOMPLETE_FLOW_KEY = "autocomplete.flow";
    private static final String AUTOCOMPLETE_METRIC_KEY = "autocomplete.metric";
    private static final int DEFAULT_AUTOCOMPLETE_SIZE = 20;
    private static final int DEFAULT_AUTOCOMPLETE_CACHE_TIME = 3600; // cache for an hour

    public static Result getSearchAutoComplete() {
        // if not input, then get all search names (without limit).
        String input = request().getQueryString("input");
        int size = 0;  // size 0 means no limit
        if (isNotBlank(input)) {
            size = NumberUtils.toInt(request().getQueryString("size"), DEFAULT_AUTOCOMPLETE_SIZE);
        }

        String cacheKey = AUTOCOMPLETE_ALL_KEY + (isNotBlank(input) ? "." + input : "-all");
        List<String> names = (List<String>) Cache.get(cacheKey);
        if (names == null || names.size() == 0) {
            names = SearchDAO.getAutoCompleteList(input, size);
            Cache.set(cacheKey, names, DEFAULT_AUTOCOMPLETE_CACHE_TIME);
        }

        ObjectNode result = Json.newObject();
        result.put("status", "ok");
        result.put("input", input);
        result.set("source", Json.toJson(names));
        return ok(result);
    }

    public static Result getSearchAutoCompleteForDataset() {
        // if not input, then get all search names (without limit).
        String input = request().getQueryString("input");
        int size = 0;  // size 0 means no limit
        if (isNotBlank(input)) {
            size = NumberUtils.toInt(request().getQueryString("size"), DEFAULT_AUTOCOMPLETE_SIZE);
        }

        String cacheKey = AUTOCOMPLETE_DATASET_KEY + (isNotBlank(input) ? "." + input : "-all");
        List<String> names = (List<String>) Cache.get(cacheKey);
        if (names == null || names.size() == 0) {
            names = SearchDAO.getAutoCompleteListDataset(input, size);
            Cache.set(cacheKey, names, DEFAULT_AUTOCOMPLETE_CACHE_TIME);
        }

        ObjectNode result = Json.newObject();
        result.put("status", "ok");
        result.put("input", input);
        result.set("source", Json.toJson(names));
        return ok(result);
    }

    public static Result getSearchAutoCompleteForMetric() {
        // if not input, then get all search names (without limit).
        String input = request().getQueryString("input");
        int size = 0;  // size 0 means no limit
        if (isNotBlank(input)) {
            size = NumberUtils.toInt(request().getQueryString("size"), DEFAULT_AUTOCOMPLETE_SIZE);
        }

        String cacheKey = AUTOCOMPLETE_METRIC_KEY + (isNotBlank(input) ? "." + input : "-all");
        List<String> names = (List<String>) Cache.get(cacheKey);
        if (names == null || names.size() == 0) {
            names = SearchDAO.getAutoCompleteListMetric(input, size);
            Cache.set(cacheKey, names, DEFAULT_AUTOCOMPLETE_CACHE_TIME);
        }

        ObjectNode result = Json.newObject();
        result.put("status", "ok");
        result.put("input", input);
        result.set("source", Json.toJson(names));
        return ok(result);
    }

    public static Result getSearchAutoCompleteForFlow() {
        // if not input, then get all search names (without limit).
        String input = request().getQueryString("input");
        int size = 0;  // size 0 means no limit
        if (isNotBlank(input)) {
            size = NumberUtils.toInt(request().getQueryString("size"), DEFAULT_AUTOCOMPLETE_SIZE);
        }

        String cacheKey = AUTOCOMPLETE_FLOW_KEY + (isNotBlank(input) ? "." + input : "-all");
        List<String> names = (List<String>) Cache.get(cacheKey);
        if (names == null || names.size() == 0) {
            names = SearchDAO.getAutoCompleteListFlow(input, size);
            Cache.set(cacheKey, names, DEFAULT_AUTOCOMPLETE_CACHE_TIME);
        }

        ObjectNode result = Json.newObject();
        result.put("status", "ok");
        result.put("input", input);
        result.set("source", Json.toJson(names));
        return ok(result);
    }

    public static Result searchByKeyword()
    {
        ObjectNode result = Json.newObject();

        int page = 1;
        int size = 10;
        String keyword = request().getQueryString("keyword");
        String category = request().getQueryString("category");
        String source = request().getQueryString("source");
        String pageStr = request().getQueryString("page");
        if (isBlank(pageStr))
        {
            page = 1;
        }
        else
        {
            try
            {
                page = Integer.parseInt(pageStr);
            }
            catch(NumberFormatException e)
            {
                Logger.error("Dataset Controller searchByKeyword wrong page parameter. Error message: " +
                        e.getMessage());
                page = 1;
            }
        }


        String sizeStr = request().getQueryString("size");
        if (isBlank(sizeStr))
        {
            size = 10;
        }
        else
        {
            try
            {
                size = Integer.parseInt(sizeStr);
            }
            catch(NumberFormatException e)
            {
                Logger.error("Dataset Controller searchByKeyword wrong page parameter. Error message: " +
                        e.getMessage());
                size = 10;
            }
        }

        result.put("status", "ok");
        Boolean isDefault = false;
        if (isBlank(category))
        {
            category = "datasets";
        }
        if (isBlank(source) || source.equalsIgnoreCase("all") || source.equalsIgnoreCase("default"))
        {
            source = null;
        }

        String searchEngine = Play.application().configuration().getString(SearchDAO.WHEREHOWS_SEARCH_ENGINE_KEY);

        if (category.toLowerCase().equalsIgnoreCase("metrics"))
        {
            if(isNotBlank(searchEngine) && searchEngine.equalsIgnoreCase("elasticsearch"))
            {
                result.set("result", SearchDAO.elasticSearchMetricByKeyword(category, keyword, page, size));

            }
            else
            {
                result.set("result", SearchDAO.getPagedMetricByKeyword(category, keyword, page, size));
            }
        }
        else if (category.toLowerCase().equalsIgnoreCase("flows"))
        {
            if(isNotBlank(searchEngine) && searchEngine.equalsIgnoreCase("elasticsearch"))
            {
                result.set("result", SearchDAO.elasticSearchFlowByKeyword(category, keyword, page, size));

            }
            else
            {
                result.set("result", SearchDAO.getPagedFlowByKeyword(category, keyword, page, size));
            }
        }
        else if (category.toLowerCase().equalsIgnoreCase("jobs"))
        {
            if(isNotBlank(searchEngine) && searchEngine.equalsIgnoreCase("elasticsearch"))
            {
                result.set("result", SearchDAO.elasticSearchFlowByKeyword(category, keyword, page, size));

            }
            else
            {
                result.set("result", SearchDAO.getPagedJobByKeyword(category, keyword, page, size));
            }
        }
        else if (category.toLowerCase().equalsIgnoreCase("comments"))
        {
            if(isNotBlank(searchEngine) && searchEngine.equalsIgnoreCase("elasticsearch"))
            {
                result.set("result", SearchDAO.elasticSearchDatasetByKeyword(category, keyword, null, page, size));
            }
            else
            {
                result.set("result", SearchDAO.getPagedCommentsByKeyword(category, keyword, page, size));
            }

        }
        else
        {
            if(isNotBlank(searchEngine) && searchEngine.equalsIgnoreCase("elasticsearch"))
            {
                result.set("result", SearchDAO.elasticSearchDatasetByKeyword(category, keyword, source, page, size));
            }
            else
            {
                result.set("result", SearchDAO.getPagedDatasetByKeyword(category, keyword, source, page, size));
            }
        }

        return ok(result);
    }


}