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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.apache.camel.component.weather.geolocation;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.camel.component.weather.WeatherConfiguration;
import org.apache.hc.client5.http.classic.HttpClient;
import org.apache.hc.client5.http.classic.methods.HttpGet;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.io.entity.EntityUtils;

import static org.apache.camel.util.ObjectHelper.isEmpty;
import static org.apache.camel.util.ObjectHelper.notNull;

public class FreeGeoIpGeoLocationProvider implements GeoLocationProvider {

    private final WeatherConfiguration configuration;

    public FreeGeoIpGeoLocationProvider(WeatherConfiguration configuration) {
        this.configuration = configuration;
    }

    @Override
    public GeoLocation getCurrentGeoLocation() throws Exception {
        HttpClient httpClient = configuration.getHttpClient();
        if (isEmpty(configuration.getGeolocationAccessKey())) {
            throw new IllegalStateException("The geolocation service requires a mandatory geolocationAccessKey");
        }
        if (isEmpty(configuration.getGeolocationRequestHostIP())) {
            throw new IllegalStateException("The geolocation service requires a mandatory geolocationRequestHostIP");
        }

        String url = String.format("http://api.ipstack.com/%s?access_key=%s&legacy=1&output=json",
                configuration.getGeolocationRequestHostIP(), configuration.getGeolocationAccessKey());
        HttpGet getMethod = new HttpGet(url);
        return httpClient.execute(
                getMethod,
                response -> {
                    try {
                        if (response.getCode() != HttpStatus.SC_OK) {
                            throw new IllegalStateException(
                                    "Got the unexpected http-status '" + response.getCode()
                                                            + "' for the geolocation");
                        }
                        String geoLocation = EntityUtils.toString(response.getEntity(), "UTF-8");
                        if (isEmpty(geoLocation)) {
                            throw new IllegalStateException(
                                    "Got the unexpected value '" + geoLocation + "' for the geolocation");
                        }

                        ObjectMapper mapper = new ObjectMapper();
                        JsonNode node = mapper.readValue(geoLocation, JsonNode.class);
                        JsonNode latitudeNode = notNull(node.get("latitude"), "latitude");
                        JsonNode longitudeNode = notNull(node.get("longitude"), "longitude");

                        return new GeoLocation(longitudeNode.asText(), latitudeNode.asText());
                    } finally {
                        getMethod.reset();
                    }
                });
    }

}