/*
 * Copyright 2017 MovingBlocks
 *
 * Licensed 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.terasology.config;

import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.List;

public class PermissionConfig {
    /**
     * Used for first time authentication at a headless server which may be at a remote location.
     */
    private String oneTimeAuthorizationKey = createRandomKey();

    /**
     * @return Builds a random key with A-Z, a-z and 2-9.
    */
    private static String createRandomKey() {
        SecureRandom random = new SecureRandom();
        List<Character> possibleCharacters = new ArrayList<>();
        for (char c = 'A'; c <= 'Z'; c++) {
            possibleCharacters.add(c);
        }
        for (char c = 'a'; c <= 'z'; c++) {
            possibleCharacters.add(c);
        }
        for (char c = '2'; c <= '9'; c++) {
            possibleCharacters.add(c);
        }

        possibleCharacters.remove(Character.valueOf('l'));
        possibleCharacters.remove(Character.valueOf('I'));
        possibleCharacters.remove(Character.valueOf('O'));

        StringBuilder codeBuilder = new StringBuilder();
        for (int i = 0; i < 20; i++) {
            if ((i != 0) && (i % 4 == 0)) {
                codeBuilder.append("-");
            }
            codeBuilder.append(possibleCharacters.get(random.nextInt(possibleCharacters.size())));
        }
        return codeBuilder.toString();
    }

    /**
     * @return Returns the one-time auth key
     */
    public String getOneTimeAuthorizationKey() {
        return oneTimeAuthorizationKey;
    }

    /**
     * @param oneTimeAuthorizationKey Sets the one-time authorization key to this String
     */
    public void setOneTimeAuthorizationKey(String oneTimeAuthorizationKey) {
        this.oneTimeAuthorizationKey = oneTimeAuthorizationKey;
    }


}