e-commerce/web_backend/src/main/java/org/hso/ecommerce/api/RestServiceForDelivery.java

package org.hso.ecommerce.api;

import org.hso.ecommerce.app.config.AppSettings;
import org.hso.ecommerce.entities.shop.CustomerOrder;
import org.hso.ecommerce.uimodel.DeliveryData;
import org.hso.ecommerce.uimodel.DeliveryDataEnum;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.http.*;
import org.springframework.stereotype.Service;
import org.springframework.web.client.ResourceAccessException;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponentsBuilder;

import java.util.HashMap;
import java.util.Map;

@Service
public class RestServiceForDelivery {

    @Autowired
    private final RestTemplateBuilder restTemplateBuilder = null;

    @Autowired
    private final AppSettings settings = null;

    private String getDeliveryEndpoint() {
        return settings.getParcelServiceApiURL();
    }


    public String getDeliveryID(CustomerOrder customerOrder) throws ResourceAccessException {
        String url = getDeliveryEndpoint() + "/newDelivery";

        RestTemplate restTemplate = restTemplateBuilder.build();

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);

        Map<String, String> requestBody = new HashMap<>();

        requestBody.put("name", customerOrder.destination.name);
        requestBody.put("address", customerOrder.destination.addressString);

        HttpEntity<Map<String, String>> entity = new HttpEntity<>(requestBody, headers);

        ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST, entity, String.class);

        if (response.getStatusCode() == HttpStatus.OK) {
            return response.getBody();
        } else {
            throw new ResourceAccessException("Http Status wrong");
        }
    }

    public DeliveryData getDeliveryData(String trackingID) {

        String url = getDeliveryEndpoint() + "/status";

        RestTemplate restTemplate = restTemplateBuilder.build();

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON);

        UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url).queryParam("trackingID", trackingID);

        HttpEntity<?> entity = new HttpEntity<>(headers);

        ResponseEntity<DeliveryData> response;

        try {
            response = restTemplate.exchange(builder.toUriString(), HttpMethod.GET, entity, DeliveryData.class);
            if (response.getStatusCode() == HttpStatus.OK) {
                return response.getBody();
            } else {

                return new DeliveryData("", "", DeliveryDataEnum.NO_DATA);
            }
        } catch (Exception e) {
            return new DeliveryData("", "", DeliveryDataEnum.NO_DATA);
        }
    }
}