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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.kerby.kerberos.tool.kadmin;

import org.apache.kerby.KOptionType;
import org.apache.kerby.KOptions;
import org.apache.kerby.kerberos.kerb.admin.kadmin.KadminOption;

import java.nio.charset.StandardCharsets;
import java.util.Scanner;

public class ToolUtil {

    public static void printUsage(String error, String usage) {
        System.err.println(error + "\n");
        System.err.println(usage);
    }

    public static KOptions parseOptions(String[] commands, int beginIndex, int endIndex) {
        KadminOption kOption;
        String opt, error, param;

        if (beginIndex < 0) {
            System.out.println("Invalid function parameter(s).");
            return null;
        }

        KOptions kOptions = new KOptions();
        int i = beginIndex;
        while (i <= endIndex) {
            error = null;
            opt = commands[i++];
            if (opt.startsWith("-")) {
                kOption = KadminOption.fromName(opt);
                if (kOption == KadminOption.NONE) {
                    error = "Invalid option:" + opt;
                }
            } else {
                kOption = KadminOption.NONE;
                error = "Invalid parameter:" + opt + " , it does not belong to any option.";
            }

            if (kOption != KadminOption.NONE && kOption.getOptionInfo().getType() != KOptionType.NOV) {
                // require a parameter
                param = null;
                if (i <= endIndex) {
                    param = commands[i++];
                }
                if (param != null) {
                    kOptions.parseSetValue(kOption.getOptionInfo(), param);
                } else {
                    error = "Option " + opt + " require a parameter";
                }
            }
            if (error != null) {
                System.out.println(error);
                return null;
            }
            if (kOption != KadminOption.NONE) {
                kOptions.add(kOption);
            }
        }
        return kOptions;
    }

    public static String getReplay(String prompt) {
        Scanner scanner = new Scanner(System.in, StandardCharsets.UTF_8.name());
        System.out.println(prompt);
        String str = scanner.nextLine().trim();
        return str;
    }
}