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package org.camunda.community.migration.converter.cli;

import java.util.Collections;
import java.util.List;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpMethod;
import org.springframework.http.client.support.BasicAuthenticationInterceptor;
import org.springframework.lang.Nullable;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.DefaultUriBuilderFactory;

public class ProcessEngineClient {
  private static final String LATEST_PROCESS_DEFINITIONS = "/process-definition?latestVersion=true";

  private static final String PROCESS_DEFINITION_XML = "/process-definition/{id}/xml";
  private final RestTemplate restTemplate;

  private ProcessEngineClient(String url) {
    this.restTemplate = new RestTemplate();
    restTemplate.setUriTemplateHandler(new DefaultUriBuilderFactory(url));
  }

  private ProcessEngineClient(String url, String username, String password) {
    this(url);
    restTemplate.getInterceptors().add(new BasicAuthenticationInterceptor(username, password));
  }

  public static ProcessEngineClient withEngine(
      String url, @Nullable String username, @Nullable String password) {
    if (username == null || password == null) {
      return new ProcessEngineClient(url);
    }
    return new ProcessEngineClient(url, username, password);
  }

  public List getAllLatestProcessDefinitions() {
    return restTemplate
        .exchange(
            LATEST_PROCESS_DEFINITIONS,
            HttpMethod.GET,
            null,
            new ParameterizedTypeReference>() {})
        .getBody();
  }

  public ProcessDefinitionDiagramDto getBpmnXml(String processDefinitionId) {
    return restTemplate.getForObject(
        PROCESS_DEFINITION_XML,
        ProcessDefinitionDiagramDto.class,
        Collections.singletonMap("id", processDefinitionId));
  }
}