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/*
 * Copyright 2012-2023 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.async;

import com.aerospike.client.AerospikeException;
import com.aerospike.client.Key;
import com.aerospike.client.Record;
import com.aerospike.client.ResultCode;
import com.aerospike.client.cluster.Cluster;
import com.aerospike.client.cluster.Node;
import com.aerospike.client.cluster.Partition;
import com.aerospike.client.command.Buffer;
import com.aerospike.client.command.Command;
import com.aerospike.client.listener.RecordListener;
import com.aerospike.client.metrics.LatencyType;
import com.aerospike.client.policy.Policy;

public class AsyncRead extends AsyncCommand {
	private final RecordListener listener;
	protected final Key key;
	private final String[] binNames;
	private final boolean isOperation;
	protected final Partition partition;
	protected Record record;

	public AsyncRead(Cluster cluster, RecordListener listener, Policy policy, Key key, String[] binNames) {
		super(policy, true);
		this.listener = listener;
		this.key = key;
		this.binNames = binNames;
		this.isOperation = false;
		this.partition = Partition.read(cluster, policy, key);
		cluster.addTran();
	}

	public AsyncRead(Cluster cluster, RecordListener listener, Policy policy, Key key, Partition partition, boolean isOperation) {
		super(policy, true);
		this.listener = listener;
		this.key = key;
		this.binNames = null;
		this.isOperation = isOperation;
		this.partition = partition;
		cluster.addTran();
	}

	@Override
	Node getNode(Cluster cluster) {
		return partition.getNodeRead(cluster);
	}

	@Override
	protected LatencyType getLatencyType() {
		return LatencyType.READ;
	}

	@Override
	protected void writeBuffer() {
		setRead(policy, key, binNames);
	}

	@Override
	protected final boolean parseResult() {
		validateHeaderSize();

		int resultCode = dataBuffer[dataOffset + 5] & 0xFF;
		int generation = Buffer.bytesToInt(dataBuffer, dataOffset + 6);
		int expiration = Buffer.bytesToInt(dataBuffer, dataOffset + 10);
		int fieldCount = Buffer.bytesToShort(dataBuffer, dataOffset + 18);
		int opCount = Buffer.bytesToShort(dataBuffer, dataOffset + 20);
		dataOffset += Command.MSG_REMAINING_HEADER_SIZE;

		if (resultCode == 0) {
			if (opCount == 0) {
				// Bin data was not returned.
				record = new Record(null, generation, expiration);
				return true;
			}
			skipKey(fieldCount);
			record = parseRecord(opCount, generation, expiration, isOperation);
			return true;
		}

		if (resultCode == ResultCode.KEY_NOT_FOUND_ERROR) {
			handleNotFound(resultCode);
			return true;
		}

		if (resultCode == ResultCode.FILTERED_OUT) {
			if (policy.failOnFilteredOut) {
				throw new AerospikeException(resultCode);
			}
			return true;
		}

		if (resultCode == ResultCode.UDF_BAD_RESPONSE) {
			skipKey(fieldCount);
			record = parseRecord(opCount, generation, expiration, isOperation);
			handleUdfError(resultCode);
			return true;
		}

		throw new AerospikeException(resultCode);
	}

	@Override
	protected boolean prepareRetry(boolean timeout) {
		partition.prepareRetryRead(timeout);
		return true;
	}

	protected void handleNotFound(int resultCode) {
		// Do nothing in default case. Record will be null.
	}

	private final void handleUdfError(int resultCode) {
		String ret = (String)record.bins.get("FAILURE");

		if (ret == null) {
			throw new AerospikeException(resultCode);
		}

		String message;
		int code;

		try {
			String[] list = ret.split(":");
			code = Integer.parseInt(list[2].trim());
			message = list[0] + ':' + list[1] + ' ' + list[3];
		}
		catch (Throwable e) {
			// Use generic exception if parse error occurs.
			throw new AerospikeException(resultCode, ret);
		}

		throw new AerospikeException(code, message);
	}

	@Override
	protected void onSuccess() {
		if (listener != null) {
			listener.onSuccess(key, record);
		}
	}

	@Override
	protected void onFailure(AerospikeException e) {
		if (listener != null) {
			listener.onFailure(e);
		}
	}
}