/*
 * This file is part of gms-client
 * Copyright (C) 2021 Istituto Nazionale di Astrofisica
 * SPDX-License-Identifier: GPL-3.0-or-later
 */
package it.inaf.ia2.gms.client.call;

import it.inaf.ia2.client.BaseCall;
import it.inaf.ia2.gms.client.GmsClient;
import java.net.URLEncoder;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse.BodyHandlers;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class ListGroupsCall extends BaseCall<GmsClient> {

    public ListGroupsCall(GmsClient client) {
        super(client);
    }

    /**
     * Returns the list of the groups in a given parent group (if the user has
     * the privileges to see that information). The parent group name is removed
     * by the service.
     */
    public List<String> listGroups(String parentGroup, boolean recursive) {

        List<String> groups = new ArrayList<>();

        if (parentGroup == null) {
            parentGroup = "";
        }

        String uri = "groups?parent="
                + URLEncoder.encode(parentGroup, StandardCharsets.UTF_8)
                + "&recursive=" + recursive;

        HttpRequest groupsRequest = client.newRequest(uri)
                .header("Accept", "text/plain")
                .GET()
                .build();

        return client.call(groupsRequest, BodyHandlers.ofInputStream(), 200,
                inputStream -> {
                    try ( Scanner scan = new Scanner(inputStream)) {
                        while (scan.hasNextLine()) {
                            String line = scan.nextLine();
                            if (!line.isEmpty()) {
                                groups.add(line);
                            }
                        }
                    }
                    return groups;
                });
    }
}