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/*
 * Copyright 2012-2024 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.ResultCode;
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;
	private String statusCommand;
	private String existsCommand;

	/**
	 * 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() {
		// All nodes must respond with load_pct of 100 to be considered done.
		Node[] nodes = cluster.validateNodes();

		for (Node node : nodes) {
			if (isCreate) {
				// Check index status.
				if (statusCommand == null) {
					statusCommand = buildStatusCommand(namespace, indexName);
				}

				String response = Info.request(policy, node, statusCommand);
				int status = parseStatusResponse(statusCommand, response, isCreate);

				if (status != Task.COMPLETE) {
					return status;
				}
			}
			else {
				// Check if index exists.
				if (existsCommand == null) {
					existsCommand = buildExistsCommand(namespace, indexName);
				}

				String response = Info.request(policy, node, existsCommand);
				int status = parseExistsResponse(existsCommand, response);

				if (status != Task.COMPLETE) {
					return status;
				}
			}
		}
		return Task.COMPLETE;
	}

	public static String buildStatusCommand(String namespace, String indexName) {
		return "sindex/" + namespace + '/' + indexName;
	}

	public static int parseStatusResponse(String command, String response, boolean isCreate) {
		if (isCreate) {
			// Check if index has been created.
			String find = "load_pct=";
			int index = response.indexOf(find);

			if (index < 0) {
				Info.Error error = new Info.Error(response);

				if (error.code == ResultCode.INDEX_NOTFOUND || error.code == ResultCode.INDEX_NOTREADABLE) {
					return Task.NOT_FOUND;
				}
				else {
					// Throw exception immediately.
					throw new AerospikeException(error.code, command + " failed: " + error.message);
				}
			}

			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.
			Info.Error error = new Info.Error(response);

			if (error.code != ResultCode.INDEX_NOTFOUND) {
				// Index still exists.
				return Task.IN_PROGRESS;
			}
		}
		return Task.COMPLETE;
	}

	public static String buildExistsCommand(String namespace, String indexName) {
		return "sindex-exists:ns=" + namespace + ";indexname=" + indexName;
	}

	public static int parseExistsResponse(String command, String response) {
		if (response.equals("false")) {
			return Task.COMPLETE;
		}

		if (response.equals("true")) {
			return Task.IN_PROGRESS;
		}

		throw new AerospikeException(command + " failed: " + response);
	}
}