module ZookeeperExceptions
  # exceptions/errors
  ZOK                    =  0
  ZSYSTEMERROR           = -1
  ZRUNTIMEINCONSISTENCY  = -2
  ZDATAINCONSISTENCY     = -3
  ZCONNECTIONLOSS        = -4
  ZMARSHALLINGERROR      = -5
  ZUNIMPLEMENTED         = -6
  ZOPERATIONTIMEOUT      = -7
  ZBADARGUMENTS          = -8
  ZINVALIDSTATE          = -9
  
  # api errors
  ZAPIERROR                 = -100
  ZNONODE                   = -101
  ZNOAUTH                   = -102
  ZBADVERSION               = -103
  ZNOCHILDRENFOREPHEMERALS  = -108
  ZNODEEXISTS               = -110
  ZNOTEMPTY                 = -111
  ZSESSIONEXPIRED           = -112
  ZINVALIDCALLBACK          = -113
  ZINVALIDACL               = -114
  ZAUTHFAILED               = -115
  ZCLOSING                  = -116
  ZNOTHING                  = -117
  ZSESSIONMOVED             = -118

  class ZookeeperException < StandardError
    class EverythingOk            < ZookeeperException; end
    class SystemError             < ZookeeperException; end
    class RunTimeInconsistency    < ZookeeperException; end
    class DataInconsistency       < ZookeeperException; end
    class ConnectionLoss          < ZookeeperException; end
    class MarshallingError        < ZookeeperException; end
    class Unimplemented           < ZookeeperException; end
    class OperationTimeOut        < ZookeeperException; end
    class BadArguments            < ZookeeperException; end
    class InvalidState            < ZookeeperException; end
    class ApiError                < ZookeeperException; end
    class NoNode                  < ZookeeperException; end
    class NoAuth                  < ZookeeperException; end
    class BadVersion              < ZookeeperException; end
    class NoChildrenForEphemerals < ZookeeperException; end
    class NodeExists              < ZookeeperException; end
    class NotEmpty                < ZookeeperException; end
    class SessionExpired          < ZookeeperException; end
    class InvalidCallback         < ZookeeperException; end
    class InvalidACL              < ZookeeperException; end
    class AuthFailed              < ZookeeperException; end
    class Closing                 < ZookeeperException; end
    class Nothing                 < ZookeeperException; end
    class SessionMoved            < ZookeeperException; end
    
    # these are Ruby client exceptions
    class ConnectionClosed        < ZookeeperException; end
    class NotConnected            < ZookeeperException; end 
    class ShuttingDownException   < ZookeeperException; end
    class DataTooLargeException   < ZookeeperException; end

    # yes, make an alias, this is the way zookeeper refers to it
    ExpiredSession = SessionExpired
    
    def self.by_code(code)
      case code
        when ZOK then EverythingOk
        when ZSYSTEMERROR then SystemError
        when ZRUNTIMEINCONSISTENCY then RunTimeInconsistency
        when ZDATAINCONSISTENCY then DataInconsistency
        when ZCONNECTIONLOSS then ConnectionLoss
        when ZMARSHALLINGERROR then MarshallingError
        when ZUNIMPLEMENTED then Unimplemented
        when ZOPERATIONTIMEOUT then OperationTimeOut
        when ZBADARGUMENTS then BadArguments
        when ZINVALIDSTATE then InvalidState
        when ZAPIERROR then ApiError
        when ZNONODE then NoNode
        when ZNOAUTH then NoAuth
        when ZBADVERSION then BadVersion
        when ZNOCHILDRENFOREPHEMERALS then NoChildrenForEphemerals 
        when ZNODEEXISTS then NodeExists              
        when ZNOTEMPTY then NotEmpty                
        when ZSESSIONEXPIRED then SessionExpired          
        when ZINVALIDCALLBACK then InvalidCallback         
        when ZINVALIDACL then InvalidACL
        when ZAUTHFAILED then AuthFailed
        when ZCLOSING then Closing
        when ZNOTHING then Nothing
        when ZSESSIONMOVED then SessionMoved
      else Exception.new("no exception defined for code #{code}")
      end
    end
    
    def self.raise_on_error(code)
      exc = self.by_code(code)
      raise exc unless exc == EverythingOk
    end
  end
end