/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you 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.elasticsearch.test.rest.parser;

import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.test.rest.section.ApiCallSection;
import org.elasticsearch.test.rest.section.DoSection;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * Parser for do sections
 */
public class DoSectionParser implements RestTestFragmentParser<DoSection> {

    @Override
    public DoSection parse(RestTestSuiteParseContext parseContext) throws IOException, RestTestParseException {

        XContentParser parser = parseContext.parser();

        String currentFieldName = null;
        XContentParser.Token token;

        DoSection doSection = new DoSection();
        ApiCallSection apiCallSection = null;
        Map<String, String> headers = new HashMap<>();

        while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
            if (token == XContentParser.Token.FIELD_NAME) {
                currentFieldName = parser.currentName();
            } else if (token.isValue()) {
                if ("catch".equals(currentFieldName)) {
                    doSection.setCatch(parser.text());
                }
            } else if (token == XContentParser.Token.START_OBJECT) {
                if ("headers".equals(currentFieldName)) {
                    String headerName = null;
                    while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
                        if (token == XContentParser.Token.FIELD_NAME) {
                            headerName = parser.currentName();
                        } else if (token.isValue()) {
                            headers.put(headerName, parser.text());
                        }
                    }
                } else if (currentFieldName != null) { // must be part of API call then
                    apiCallSection = new ApiCallSection(currentFieldName);
                    String paramName = null;
                    while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
                        if (token == XContentParser.Token.FIELD_NAME) {
                            paramName = parser.currentName();
                        } else if (token.isValue()) {
                            if ("body".equals(paramName)) {
                                String body = parser.text();
                                XContentType bodyContentType = XContentFactory.xContentType(body);
                                XContentParser bodyParser = XContentFactory.xContent(bodyContentType).createParser(body);
                                //multiple bodies are supported e.g. in case of bulk provided as a whole string
                                while(bodyParser.nextToken() != null) {
                                    apiCallSection.addBody(bodyParser.mapOrdered());
                                }
                            } else {
                                apiCallSection.addParam(paramName, parser.text());
                            }
                        } else if (token == XContentParser.Token.START_OBJECT) {
                            if ("body".equals(paramName)) {
                                apiCallSection.addBody(parser.mapOrdered());
                            }
                        }
                    }
                }
            }
        }
        try {
            if (apiCallSection == null) {
                throw new RestTestParseException("client call section is mandatory within a do section");
            }
            if (headers.isEmpty() == false) {
                apiCallSection.addHeaders(headers);
            }
            doSection.setApiCallSection(apiCallSection);
        } finally {
            parser.nextToken();
        }
        return doSection;
    }
}