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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.curator.utils;

/**
 * This class is copied from Apache ZooKeeper.
 * The original class is not exported by ZooKeeper bundle and thus it can't be used in OSGi.
 * See issue: https://issues.apache.org/jira/browse/ZOOKEEPER-1627
 * A temporary workaround till the issue is resolved is to keep a copy of this class locally.
 */
public class PathUtils {

    /** validate the provided znode path string
     * @param path znode path string
     * @param isSequential if the path is being created
     * with a sequential flag
     * @throws IllegalArgumentException if the path is invalid
     */
    public static void validatePath(String path, boolean isSequential)
            throws IllegalArgumentException {
        validatePath(isSequential? path + "1": path);
    }

    /**
     * Validate the provided znode path string
     * @param path znode path string
     * @return The given path if it was valid, for fluent chaining
     * @throws IllegalArgumentException if the path is invalid
     */
    public static String validatePath(String path) throws IllegalArgumentException {
        if (path == null) {
            throw new IllegalArgumentException("Path cannot be null");
        }
        if (path.length() == 0) {
            throw new IllegalArgumentException("Path length must be > 0");
        }
        if (path.charAt(0) != '/') {
            throw new IllegalArgumentException(
                    "Path must start with / character");
        }
        if (path.length() == 1) { // done checking - it's the root
            return path;
        }
        if (path.charAt(path.length() - 1) == '/') {
            throw new IllegalArgumentException(
                    "Path must not end with / character");
        }

        String reason = null;
        char lastc = '/';
        char chars[] = path.toCharArray();
        char c;
        for (int i = 1; i < chars.length; lastc = chars[i], i++) {
            c = chars[i];

            if (c == 0) {
                reason = "null character not allowed @" + i;
                break;
            } else if (c == '/' && lastc == '/') {
                reason = "empty node name specified @" + i;
                break;
            } else if (c == '.' && lastc == '.') {
                if (chars[i-2] == '/' &&
                        ((i + 1 == chars.length)
                                || chars[i+1] == '/')) {
                    reason = "relative paths not allowed @" + i;
                    break;
                }
            } else if (c == '.') {
                if (chars[i-1] == '/' &&
                        ((i + 1 == chars.length)
                                || chars[i+1] == '/')) {
                    reason = "relative paths not allowed @" + i;
                    break;
                }
            } else if (c > '\u0000' && c < '\u001f'
                    || c > '\u007f' && c < '\u009F'
                    || c > '\ud800' && c < '\uf8ff'
                    || c > '\ufff0' && c < '\uffff') {
                reason = "invalid charater @" + i;
                break;
            }
        }

        if (reason != null) {
            throw new IllegalArgumentException(
                    "Invalid path string \"" + path + "\" caused by " + reason);
        }

        return path;
    }
}