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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.zookeeper;

import java.util.List;
import jline.console.completer.Completer;

class JLineZNodeCompleter implements Completer {
  private ZooKeeper zk;

  public JLineZNodeCompleter(ZooKeeper zk) {
    this.zk = zk;
  }

  @SuppressWarnings(value = {"unchecked", "rawtypes"})
  public int complete(String buffer, int cursor, List candidates) {
    // Guarantee that the final token is the one we're expanding
    buffer = buffer.substring(0, cursor);
    String token = "";
    if (!buffer.endsWith(" ")) {
      String[] tokens = buffer.split(" ");
      if (tokens.length != 0) {
        token = tokens[tokens.length - 1];
      }
    }

    if (token.startsWith("/")) {
      return completeZNode(buffer, token, candidates);
    }
    return completeCommand(buffer, token, candidates);
  }

  private int completeCommand(String buffer, String token, List candidates) {
    for (String cmd : ZooKeeperMain.getCommands()) {
      if (cmd.startsWith(token)) {
        candidates.add(cmd);
      }
    }
    return buffer.lastIndexOf(" ") + 1;
  }

  private int completeZNode(String buffer, String token, List candidates) {
    String path = token;
    int idx = path.lastIndexOf("/") + 1;
    String prefix = path.substring(idx);
    try {
      // Only the root path can end in a /, so strip it off every other prefix
      String dir = idx == 1 ? "/" : path.substring(0, idx - 1);
      List children = zk.getChildren(dir, false);
      for (String child : children) {
        if (child.startsWith(prefix)) {
          candidates.add(child);
        }
      }
    } catch (InterruptedException e) {
      return 0;
    } catch (KeeperException e) {
      return 0;
    }
    return candidates.size() == 0 ? buffer.length() : buffer.lastIndexOf("/") + 1;
  }
}