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/*
 * Copyright 2012-2018 Aerospike, Inc.
 *
 * Portions may be licensed to Aerospike, Inc. under one or more contributor
 * license agreements WHICH ARE COMPATIBLE WITH THE APACHE LICENSE, VERSION 2.0.
 *
 * 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 com.aerospike.client.task;

import com.aerospike.client.AerospikeException;
import com.aerospike.client.Info;
import com.aerospike.client.cluster.Cluster;
import com.aerospike.client.cluster.Node;
import com.aerospike.client.policy.Policy;

/**
 * Task used to poll for long running create index completion.
 */
public final class IndexTask extends Task {
	private final String namespace;
	private final String indexName;
	private final boolean isCreate;

	/**
	 * Initialize task with fields needed to query server nodes.
	 */
	public IndexTask(Cluster cluster, Policy policy, String namespace, String indexName, boolean isCreate) {
		super(cluster, policy);
		this.namespace = namespace;
		this.indexName = indexName;
		this.isCreate = isCreate;
	}

	/**
	 * Query all nodes for task completion status.
	 */
	@Override
	public int queryStatus() throws AerospikeException {
		// All nodes must respond with load_pct of 100 to be considered done.
		Node[] nodes = cluster.getNodes();
		
		if (nodes.length == 0) {
			throw new AerospikeException("Cluster is empty");
		}
		
		String command = "sindex/" + namespace + '/' + indexName;

		for (Node node : nodes) {
			String response = Info.request(policy, node, command);
			
			if (isCreate) {
				// Check if index has been created.
				String find = "load_pct=";
				int index = response.indexOf(find);
	
				if (index < 0) {
					if (response.indexOf("FAIL:201") >= 0 || response.indexOf("FAIL:203") >= 0) {
						// Index not found or not readable.
						return Task.NOT_FOUND;
					}
					else {
						// Throw exception immediately.
						throw new AerospikeException(command + " failed: " + response);				
					}
				}
	
				int begin = index + find.length();
				int end = response.indexOf(';', begin);
				String str = response.substring(begin, end);
				int pct = Integer.parseInt(str);
				
				if (pct != 100) {				
					return Task.IN_PROGRESS;
				}
			}
			else {
				// Check if index has been dropped.
				if (response.indexOf("FAIL:201") < 0) {
					// Index still exists.
					return Task.IN_PROGRESS;
				}
			}
		}
		return Task.COMPLETE;
	}
}