// Copyright (C) The Arvados Authors. All rights reserved.
//
// SPDX-License-Identifier: Apache-2.0

/**
 * This Sample test program is useful in getting started with using Arvados Java SDK.
 * This program creates an Arvados instance using the configured environment variables.
 * It then provides a prompt to input method name and input parameters. 
 * The program them invokes the API server to execute the specified method.  
 * 
 * @author radhika
 */

import org.arvados.sdk.Arvados;

import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ArvadosSDKJavaExampleWithPrompt {
  /**
   * Make sure the following environment variables are set before using Arvados:
   * ARVADOS_API_TOKEN, ARVADOS_API_HOST and ARVADOS_API_HOST_INSECURE Set
   * ARVADOS_API_HOST_INSECURE to true if you are using self-singed certificates
   * in development and want to bypass certificate validations.
   * 
   * Please refer to http://doc.arvados.org/api/index.html for a complete list
   * of the available API methods.
   */
  public static void main(String[] args) throws Exception {
    String apiName = "arvados";
    String apiVersion = "v1";

    System.out.print("Welcome to Arvados Java SDK.");
    System.out.println("\nYou can use this example to call API methods interactively.");
    System.out.println("\nPlease refer to http://doc.arvados.org/api/index.html for api documentation");
    System.out.println("\nTo make the calls, enter input data at the prompt.");
    System.out.println("When entering parameters, you may enter a simple string or a well-formed json.");
    System.out.println("For example to get a user you may enter:  user, zzzzz-12345-67890");
    System.out.println("Or to filter links, you may enter:  filters, [[ \"name\", \"=\", \"can_manage\"]]");

    System.out.println("\nEnter ^C when you want to quit");

    // use configured env variables for API TOKEN, HOST and HOST_INSECURE
    Arvados arv = new Arvados(apiName, apiVersion);

    while (true) {
      try {
        // prompt for resource
        System.out.println("\n\nEnter Resource name (for example users)");
        System.out.println("\nAvailable resources are: " + arv.getAvailableResourses());
        System.out.print("\n>>> ");

        // read resource name
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String resourceName = in.readLine().trim();
        if ("".equals(resourceName)) {
          throw (new Exception("No resource name entered"));
        }
        // read method name
        System.out.println("\nEnter method name (for example get)");
        System.out.println("\nAvailable methods are: " + arv.getAvailableMethodsForResourse(resourceName));
        System.out.print("\n>>> ");
        String methodName = in.readLine().trim();
        if ("".equals(methodName)) {
          throw (new Exception("No method name entered"));
        }

        // read method parameters
        System.out.println("\nEnter parameter name, value (for example uuid, uuid-value)");
        System.out.println("\nAvailable parameters are: " + 
              arv.getAvailableParametersForMethod(resourceName, methodName));
        
        System.out.print("\n>>> ");
        Map paramsMap = new HashMap();
        String param = "";
        try {
          do {
            param = in.readLine();
            if (param.isEmpty())
              break;
            int index = param.indexOf(","); // first comma
            String paramName = param.substring(0, index);
            String paramValue = param.substring(index+1);
            paramsMap.put(paramName.trim(), paramValue.trim());

            System.out.println("\nEnter parameter name, value (for example uuid, uuid-value)");
            System.out.print("\n>>> ");
          } while (!param.isEmpty());
        } catch (Exception e) {
          System.out.println (e.getMessage());
          System.out.println ("\nSet up a new call");
          continue;
        }

        // Make a "call" for the given resource name and method name
        try {
          System.out.println ("Making a call for " + resourceName + " " + methodName);
          Map response = arv.call(resourceName, methodName, paramsMap);

          Set<Entry<String,Object>> entrySet = (Set<Entry<String,Object>>)response.entrySet();
          for (Map.Entry<String, Object> entry : entrySet) {
            if ("items".equals(entry.getKey())) {
              List items = (List)entry.getValue();
              for (Object item : items) {
                System.out.println("    " + item);
              }            
            } else {
              System.out.println(entry.getKey() + " = " + entry.getValue());
            }
          }
        } catch (Exception e){
          System.out.println (e.getMessage());
          System.out.println ("\nSet up a new call");
        }
      } catch (Exception e) {
        System.out.println (e.getMessage());
        System.out.println ("\nSet up a new call");
      }
    }
  }
}