// http://dev.mysql.com/doc/internals/en/com-binlog-dump.html#packet-COM_BINLOG_DUMP
var Buffer = require('safe-buffer').Buffer;
var Packet = require('../packets/packet');
var CommandCodes = require('../constants/commands');

// TODO: add flag to constants
// 0x01 - BINLOG_DUMP_NON_BLOCK
// send EOF instead of blocking

function BinlogDump(opts) {
  this.binlogPos = opts.binlogPos || 0;
  this.serverId = opts.serverId || 0;
  this.flags = opts.flags || 0;
  this.filename = opts.filename || '';
}

BinlogDump.prototype.toPacket = function() {
  var length = 15 + Buffer.byteLength(this.filename, 'utf8'); // TODO: should be ascii?
  var buffer = Buffer.allocUnsafe(length);
  var packet = new Packet(0, buffer, 0, length);
  packet.offset = 4;
  packet.writeInt8(CommandCodes.BINLOG_DUMP);
  packet.writeInt32(this.binlogPos);
  packet.writeInt16(this.flags);
  packet.writeInt32(this.serverId);
  packet.writeString(this.filename);
  return packet;
};

module.exports = BinlogDump;