// http://dev.mysql.com/doc/internals/en/com-register-slave.html
// note that documentation is incorrect, for example command code is actually 0x15 but documented as 0x14

var Packet = require('../packets/packet');
var CommandCodes = require('../constants/commands');

function RegisterSlave(opts)
{
  this.serverId        = opts.serverId || 0;
  this.slaveHostname   = opts.slaveHostname || '';
  this.slaveUser       = opts.slaveUser || '';
  this.slavePassword   = opts.slavePassword || '';
  this.slavePort       = opts.slavePort || 0;
  this.replicationRank = opts.replicationRank || 0;
  this.masterId        = opts.masterId || 0;
}

RegisterSlave.prototype.toPacket = function()
{
  var length =  15 + // TODO: should be ascii?
    Buffer.byteLength(this.slaveHostname, 'utf8') +
    Buffer.byteLength(this.slaveUser, 'utf8') +
    Buffer.byteLength(this.slavePassword, 'utf8') + 3 + 4;
  var buffer = new Buffer(length);
  var packet = new Packet(0, buffer);
  packet.offset = 4;
  packet.writeInt8(CommandCodes.REGISTER_SLAVE);
  packet.writeInt32(this.serverId);
  packet.writeInt8(Buffer.byteLength(this.slaveHostname, 'utf8'));
  packet.writeString(this.slaveHostname);
  packet.writeInt8(Buffer.byteLength(this.slaveUser, 'utf8'));
  packet.writeString(this.slaveUser);
  packet.writeInt8(Buffer.byteLength(this.slavePassword, 'utf8'));
  packet.writeString(this.slavePassword);
  packet.writeInt16(this.slavePort);
  packet.writeInt32(this.replicationRank);
  packet.writeInt32(this.masterId); 
  return packet;
};

module.exports = RegisterSlave;