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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.command;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

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.Connection;
import com.aerospike.client.policy.Policy;

public class ReadCommand extends SyncCommand {
	private final Policy policy;
	protected final Key key;
	private final String[] binNames;
	private Record record;

	public ReadCommand(Policy policy, Key key, String[] binNames) {
		this.policy = policy;
		this.key = key;
		this.binNames = binNames;
	}

	public ReadCommand(Key key) {
		this.policy = null;
		this.key = key;
		this.binNames = null;
	}

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

	@Override
	protected void parseResult(Connection conn) throws IOException {
		// Read header.
		conn.readFully(dataBuffer, Command.MSG_TOTAL_HEADER_SIZE, Command.STATE_READ_HEADER);

        // A number of these are commented out because we just don't care enough to read
        // that section of the header. If we do care, uncomment and check!
		long sz = Buffer.bytesToLong(dataBuffer, 0);
		byte headerLength = dataBuffer[8];
//		byte info1 = header[9];
//		byte info2 = header[10];
//      byte info3 = header[11];
//      byte unused = header[12];
		int resultCode = dataBuffer[13] & 0xFF;
		int generation = Buffer.bytesToInt(dataBuffer, 14);
		int expiration = Buffer.bytesToInt(dataBuffer, 18);
//		int transactionTtl = get_ntohl(header, 22);
		int fieldCount = Buffer.bytesToShort(dataBuffer, 26); // almost certainly 0
		int opCount = Buffer.bytesToShort(dataBuffer, 28);
		int receiveSize = ((int) (sz & 0xFFFFFFFFFFFFL)) - headerLength;
		/*
		byte version = (byte) (((int)(sz >> 56)) & 0xff);
		if (version != MSG_VERSION) {
			if (Log.debugEnabled()) {
				Log.debug("read header: incorrect version.");
			}
		}

		byte type = (byte) (((int)(sz >> 48)) & 0xff);
		if (type != MSG_TYPE) {
			if (Log.debugEnabled()) {
				Log.debug("read header: incorrect message type, aborting receive");
			}
		}

		if (headerLength != MSG_REMAINING_HEADER_SIZE) {
			if (Log.debugEnabled()) {
				Log.debug("read header: unexpected header size, aborting");
			}
		}*/

		// Read remaining message bytes.
        if (receiveSize > 0) {
        	sizeBuffer(receiveSize);
    		conn.readFully(dataBuffer, receiveSize, Command.STATE_READ_DETAIL);
        }

        if (resultCode != 0) {
        	if (resultCode == ResultCode.KEY_NOT_FOUND_ERROR || resultCode == ResultCode.LARGE_ITEM_NOT_FOUND) {
        		handleNotFound(resultCode);
        		return;
        	}

        	if (resultCode == ResultCode.UDF_BAD_RESPONSE) {
				record = parseRecord(opCount, fieldCount, generation, expiration);
				handleUdfError(resultCode);
				return;
        	}
        	throw new AerospikeException(resultCode);
        }

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

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

	private void handleUdfError(int resultCode) throws AerospikeException {
		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());

			if (code == ResultCode.LARGE_ITEM_NOT_FOUND) {
				record = null;
				return;
			}
			message = list[0] + ':' + list[1] + ' ' + list[3];
		}
		catch (Exception e) {
			// Use generic exception if parse error occurs.
        	throw new AerospikeException(resultCode, ret);
		}

		throw new AerospikeException(code, message);
	}

	private final Record parseRecord(
		int opCount,
		int fieldCount,
		int generation,
		int expiration
	) throws AerospikeException {
		Map bins = new HashMap();
	    int receiveOffset = 0;

		// There can be fields in the response (setname etc).
		// But for now, ignore them. Expose them to the API if needed in the future.
		if (fieldCount > 0) {
			// Just skip over all the fields
			for (int i = 0; i < fieldCount; i++) {
				int fieldSize = Buffer.bytesToInt(dataBuffer, receiveOffset);
				receiveOffset += 4 + fieldSize;
			}
		}

		for (int i = 0 ; i < opCount; i++) {
			int opSize = Buffer.bytesToInt(dataBuffer, receiveOffset);
			byte particleType = dataBuffer[receiveOffset+5];
			byte nameSize = dataBuffer[receiveOffset+7];
			String name = Buffer.utf8ToString(dataBuffer, receiveOffset+8, nameSize);
			receiveOffset += 4 + 4 + nameSize;

			int particleBytesSize = opSize - (4 + nameSize);
	        Object value = Buffer.bytesToParticle(particleType, dataBuffer, receiveOffset, particleBytesSize);
			receiveOffset += particleBytesSize;
			addBin(bins, name, value);
	    }
	    return new Record(bins, generation, expiration);
	}

    /*
     * The function represents mutability on the Record.
     * The function is overridden in other commands to change
     * the behaviour of adding/modifying key to the map
     * @see com.aerospike.client.command.OperateCommand
     */
    protected void addBin(Map bins, String name, Object value) {
        bins.put(name, value);
    }

	public Record getRecord() {
		return record;
	}
}