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package eu.dnetlib.data.search.web.api;
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import eu.dnetlib.data.search.web.utils.RequestResponseHandler;
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import eu.dnetlib.domain.data.SearchResult;
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import org.apache.commons.lang3.StringEscapeUtils;
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import javax.servlet.http.HttpServletRequest;
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import javax.ws.rs.core.MediaType;
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import java.util.Iterator;
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import java.util.List;
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/**
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* Created by kiatrop on 21/11/2016.
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*/
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public class APIResponseFormatter {
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//private static final Logger logger = Logger.getLogger(APIResponseFormatter.class);
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public static String compose404Message(String type, String message) {
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if(type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat.error404Message, StringEscapeUtils.escapeJson(message));
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}
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return String.format(XMLResponseFormat.error404Message, StringEscapeUtils.escapeXml10(message));
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}
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public static String compose400Message(String type, String message) {
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if(type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat.error400Message, StringEscapeUtils.escapeJson(message));
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}
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return String.format(XMLResponseFormat.error400Message, StringEscapeUtils.escapeXml10(message));
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}
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public static String compose500Message(String type, String message, String description) {
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if(type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat.error500Message, StringEscapeUtils.escapeJson(message), StringEscapeUtils.escapeJson(description));
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}
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return String.format(XMLResponseFormat.error500Message, StringEscapeUtils.escapeXml10(message), StringEscapeUtils.escapeXml10(description));
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}
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public static String createCountMeta(HttpServletRequest request, String query, int total, String type) {
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String selfPageUrl = pageUrlCreation(request);
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if (type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat.countSearch, StringEscapeUtils.escapeJson(query), total, formatSelfPaging(type, selfPageUrl));
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}
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return String.format(XMLResponseFormat.countSearch, StringEscapeUtils.escapeXml10(query), total, formatSelfPaging(type, selfPageUrl));
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}
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public static String createEntityResponse(HttpServletRequest request, RequestResponseHandler.Entity entityType, String entity, String type) {
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if (type.equals(MediaType.APPLICATION_JSON)) {
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String cleanEntity = null;
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if (entity != null && !entity.isEmpty()) {
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cleanEntity = entity.substring(1, entity.length() - 1);
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} else {
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cleanEntity = "\"result\":{}";
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}
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return String.format(JSONResponseFormat.singleValueResponse, createMetaBasic(request, type), cleanEntity);
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}
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return String.format(XMLResponseFormat.singleValueResponse, createMetaBasic(request, type), entity);
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}
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public static String createEntitiesResponse(HttpServletRequest request, RequestResponseHandler.Entity entityType, String query, List<String> filters, SearchResult searchResult, boolean refine, String type) {
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if (refine) {
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if (type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat.response, createMeta(request, type, query, filters, searchResult.getTotal(), searchResult.getPage(), searchResult.getSize()), formatSearchResults(type,searchResult.getSearchResults()), formatRefineResults(type, searchResult.getBrowseResults()));
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}
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return String.format(XMLResponseFormat.response, createMeta(request, type, query, filters, searchResult.getTotal(), searchResult.getPage(), searchResult.getSize()), formatSearchResults(type,searchResult.getSearchResults()), formatRefineResults(type, searchResult.getBrowseResults()));
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}
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if (type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat.response, createMeta(request, type, query, filters, searchResult.getTotal(), searchResult.getPage(), searchResult.getSize()), formatSearchResults(type, searchResult.getSearchResults()), "");
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}
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return String.format(XMLResponseFormat.response, createMeta(request, type, query, filters, searchResult.getTotal(), searchResult.getPage(), searchResult.getSize()), formatSearchResults(type, searchResult.getSearchResults()), "");
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}
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private static String formatRefineResults(String type, List<String> refineResults) {
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if (type.equals(MediaType.APPLICATION_JSON)) {
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if (refineResults == null || refineResults.isEmpty()) {
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return ",\"refineResults\":{}";
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}
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return ",\"refineResults\": {" + appendJSONStrings(refineResults) + "}";
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}
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if (refineResults == null || refineResults.isEmpty()) {
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return "<refineResults></refineResults>";
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}
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return "<refineResults>" + appendXMLStrings(refineResults) + "</refineResults>";
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}
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private static String formatSearchResults(String type, List<String> searchResults) {
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if (searchResults == null || searchResults.isEmpty()) {
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return "";
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}
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if (type.equals(MediaType.APPLICATION_JSON)) {
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return appendJSONStrings(searchResults);
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}
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return appendXMLStrings(searchResults);
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}
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private static String appendXMLStrings(List<String> searchResults) {
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StringBuilder stringBuilder = new StringBuilder();
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for (String xml:searchResults) {
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stringBuilder.append(xml);
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}
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return stringBuilder.toString();
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}
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private static String appendJSONStrings(List<String> searchResults) {
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StringBuilder stringBuilder = new StringBuilder();
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for (Iterator<String> iterator = searchResults.iterator(); iterator.hasNext();) {
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stringBuilder.append(iterator.next());
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if (iterator.hasNext()) {
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stringBuilder.append(",");
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}
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}
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return stringBuilder.toString();
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}
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public static String createMetaBasic(HttpServletRequest request, String type) {
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String selfPageUrl = pageUrlCreation(request);
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if (type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat.metaBasic, formatSelfPaging(type, selfPageUrl));
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}
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return String.format(XMLResponseFormat.metaBasic, formatSelfPaging(type, selfPageUrl));
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}
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public static String createMeta(HttpServletRequest request, String type, String query, List<String> filters, int total, int currentOffset, int limit) {
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if (type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat.metaSearch, StringEscapeUtils.escapeJson(query), createFilters(type, filters), total, currentOffset, limit, createPaging(request, type, total, currentOffset, limit));
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}
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return String.format(XMLResponseFormat.metaSearch, StringEscapeUtils.escapeXml10(query), createFilters(type, filters), total, currentOffset, limit, createPaging(request, type, total, currentOffset, limit));
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}
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public static String createFilters(String type, List<String> fieldQueries) {
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StringBuilder builder = new StringBuilder();
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if (fieldQueries != null) {
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if (type.equals(MediaType.APPLICATION_JSON)) {
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for (Iterator<String> iterator = fieldQueries.iterator(); iterator.hasNext(); ) {
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builder.append("\"").append(StringEscapeUtils.escapeJson(iterator.next())).append("\"");
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if (iterator.hasNext()) {
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builder.append(",");
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}
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}
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} else {
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for (Iterator<String> iterator = fieldQueries.iterator(); iterator.hasNext(); ) {
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builder.append("<filter>").append(StringEscapeUtils.escapeXml10(iterator.next())).append("</filter>");
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}
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}
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}
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return builder.toString();
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}
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private static String createPaging(HttpServletRequest request, String type, int total, int currentOffset, int limit) {
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String url = request.getRequestURL().toString();
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String selfPageUrl = null;
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if (limit > 0) {
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String firstPageUrl = null;
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String lastPageUrl = null;
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String previousPageUrl = null;
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String nextPageUrl = null;
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if (type.equals(MediaType.APPLICATION_JSON)) {
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selfPageUrl = pageUrlCreation(url, currentOffset, limit);
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firstPageUrl = pageUrlCreation(url, 0, limit);
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lastPageUrl = pageUrlCreation(url, calculateLastPage(total, limit), limit);
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previousPageUrl = pageUrlCreation(url, calculatePreviousPage(total, currentOffset, limit), limit);
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nextPageUrl = pageUrlCreation(url, calculateNextPage(total, currentOffset, limit), limit);
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} else {
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selfPageUrl = StringEscapeUtils.escapeXml10(pageUrlCreation(url, currentOffset, limit));
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firstPageUrl = StringEscapeUtils.escapeXml10(pageUrlCreation(url, 0, limit));
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lastPageUrl = StringEscapeUtils.escapeXml10(pageUrlCreation(url, calculateLastPage(total, limit), limit));
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previousPageUrl = StringEscapeUtils.escapeXml10(pageUrlCreation(url, calculatePreviousPage(total, currentOffset, limit), limit));
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nextPageUrl = StringEscapeUtils.escapeXml10(pageUrlCreation(url, calculateNextPage(total, currentOffset, limit), limit));
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}
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return formatPaging(type, firstPageUrl, lastPageUrl, previousPageUrl, nextPageUrl, selfPageUrl);
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}
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if (type.equals(MediaType.APPLICATION_JSON)) {
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selfPageUrl = pageUrlCreation(url, currentOffset, limit);
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} else {
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selfPageUrl = StringEscapeUtils.escapeXml10(pageUrlCreation(url, currentOffset, limit));
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}
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return formatSelfPaging(type, selfPageUrl);
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}
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private static String formatPaging(String type, String first, String last, String previous, String next, String self) {
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if (type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat._links, first, last, previous, next, self);
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}
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return String.format(XMLResponseFormat._links, first, last, previous, next, self);
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}
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private static String formatSelfPaging(String type, String self) {
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if (type.equals(MediaType.APPLICATION_JSON)) {
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return String.format(JSONResponseFormat._selflink, self);
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}
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return String.format(XMLResponseFormat._selflink, self);
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}
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private static int calculateLastPage(int total, int limit) {
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if (total <= limit) {
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return 0;
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} else {
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if (total%limit == 0) {
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return total / limit - 1;
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}
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return total/limit ;
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}
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}
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private static int calculatePreviousPage(int total, int currentOffset, int limit) {
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if (currentOffset-1 <= 0) {
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return 0;
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}
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int lastPage = calculateLastPage(total, limit);
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return (currentOffset-1 < lastPage) ? (currentOffset-1) : lastPage;
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}
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private static int calculateNextPage(int total, int currentOffset, int limit) {
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int lastPage = calculateLastPage(total, limit);
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return (currentOffset + 1 >= lastPage) ? lastPage:(currentOffset+1);
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}
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private static String pageUrlCreation(String urlPrefix, int offset, int limit) {
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return urlPrefix + "?page=" + offset + "&size=" + limit;
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}
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private static String pageUrlCreation(HttpServletRequest request) {
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StringBuffer requestURL = request.getRequestURL();
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String queryString = request.getQueryString();
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if (queryString == null) {
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return requestURL.toString();
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} else {
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return requestURL.append('?').append(queryString).toString();
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}
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}
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}
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