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    use base64;
    use sha1;
    use std::convert::{From, Into};
    use std::fmt;

    use self::OpCode::*;
    /// Operation codes as part of rfc6455.
    #[derive(Debug, Eq, PartialEq, Clone, Copy)]
    pub enum OpCode {
        /// Indicates a continuation frame of a fragmented message.
        Continue,
        /// Indicates a text data frame.
        Text,
        /// Indicates a binary data frame.
        Binary,
        /// Indicates a close control frame.
        Close,
        /// Indicates a ping control frame.
        Ping,
        /// Indicates a pong control frame.
        Pong,
        /// Indicates an invalid opcode was received.
        Bad,
    }

    impl fmt::Display for OpCode {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            match *self {
                Continue => write!(f, "CONTINUE"),
                Text => write!(f, "TEXT"),
                Binary => write!(f, "BINARY"),
                Close => write!(f, "CLOSE"),
                Ping => write!(f, "PING"),
                Pong => write!(f, "PONG"),
                Bad => write!(f, "BAD"),
            }
        }
    }

    impl Into<u8> for OpCode {
        fn into(self) -> u8 {
            match self {
                Continue => 0,
                Text => 1,
                Binary => 2,
                Close => 8,
                Ping => 9,
                Pong => 10,
                Bad => {
                    debug_assert!(
                        false,
                        "Attempted to convert invalid opcode to u8. This is a bug."
                    );
                    8 // if this somehow happens, a close frame will help us tear down quickly
                }
            }
        }
    }

    impl From<u8> for OpCode {
        fn from(byte: u8) -> OpCode {
            match byte {
                0 => Continue,
                1 => Text,
                2 => Binary,
                8 => Close,
                9 => Ping,
                10 => Pong,
                _ => Bad,
            }
        }
    }

    use self::CloseCode::*;
    /// Status code used to indicate why an endpoint is closing the `WebSocket`
    /// connection.
    #[derive(Debug, Eq, PartialEq, Clone, Copy)]
    pub enum CloseCode {
        /// Indicates a normal closure, meaning that the purpose for
        /// which the connection was established has been fulfilled.
        Normal,
        /// Indicates that an endpoint is "going away", such as a server
        /// going down or a browser having navigated away from a page.
        Away,
        /// Indicates that an endpoint is terminating the connection due
        /// to a protocol error.
        Protocol,
        /// Indicates that an endpoint is terminating the connection
        /// because it has received a type of data it cannot accept (e.g., an
        /// endpoint that understands only text data MAY send this if it
        /// receives a binary message).
        Unsupported,
        /// Indicates an abnormal closure. If the abnormal closure was due to an
        /// error, this close code will not be used. Instead, the `on_error` method
        /// of the handler will be called with the error. However, if the connection
        /// is simply dropped, without an error, this close code will be sent to the
        /// handler.
        Abnormal,
        /// Indicates that an endpoint is terminating the connection
        /// because it has received data within a message that was not
        /// consistent with the type of the message (e.g., non-UTF-8 [RFC3629]
        /// data within a text message).
        Invalid,
        /// Indicates that an endpoint is terminating the connection
        /// because it has received a message that violates its policy.  This
        /// is a generic status code that can be returned when there is no
        /// other more suitable status code (e.g., Unsupported or Size) or if there
        /// is a need to hide specific details about the policy.
        Policy,
        /// Indicates that an endpoint is terminating the connection
        /// because it has received a message that is too big for it to
        /// process.
        Size,
        /// Indicates that an endpoint (client) is terminating the
        /// connection because it has expected the server to negotiate one or
        /// more extension, but the server didn't return them in the response
        /// message of the WebSocket handshake.  The list of extensions that
        /// are needed should be given as the reason for closing.
        /// Note that this status code is not used by the server, because it
        /// can fail the WebSocket handshake instead.
        Extension,
        /// Indicates that a server is terminating the connection because
        /// it encountered an unexpected condition that prevented it from
        /// fulfilling the request.
        Error,
        /// Indicates that the server is restarting. A client may choose to
        /// reconnect, and if it does, it should use a randomized delay of 5-30
        /// seconds between attempts.
        Restart,
        /// Indicates that the server is overloaded and the client should either
        /// connect to a different IP (when multiple targets exist), or
        /// reconnect to the same IP when a user has performed an action.
        Again,
        #[doc(hidden)]
        Tls,
        #[doc(hidden)]
        Other(u16),
    }

    impl Into<u16> for CloseCode {
        fn into(self) -> u16 {
            match self {
                Normal => 1000,
                Away => 1001,
                Protocol => 1002,
                Unsupported => 1003,
                Abnormal => 1006,
                Invalid => 1007,
                Policy => 1008,
                Size => 1009,
                Extension => 1010,
                Error => 1011,
                Restart => 1012,
                Again => 1013,
                Tls => 1015,
                Other(code) => code,
            }
        }
    }

    impl From<u16> for CloseCode {
        fn from(code: u16) -> CloseCode {
            match code {
                1000 => Normal,
                1001 => Away,
                1002 => Protocol,
                1003 => Unsupported,
                1006 => Abnormal,
                1007 => Invalid,
                1008 => Policy,
                1009 => Size,
                1010 => Extension,
                1011 => Error,
                1012 => Restart,
                1013 => Again,
                1015 => Tls,
                _ => Other(code),
            }
        }
    }

    #[derive(Debug, Eq, PartialEq, Clone)]
    /// Reason for closing the connection
    pub struct CloseReason {
        /// Exit code
        pub code: CloseCode,
        /// Optional description of the exit code
        pub description: Option<String>,
    }

    impl From<CloseCode> for CloseReason {
        fn from(code: CloseCode) -> Self {
            CloseReason {
                code,
                description: None,
            }
        }
    }

    impl<T: Into<String>> From<(CloseCode, T)> for CloseReason {
        fn from(info: (CloseCode, T)) -> Self {
            CloseReason {
                code: info.0,
                description: Some(info.1.into()),
            }
        }
    }

    static WS_GUID: &'static str = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";

    // TODO: hash is always same size, we dont need String
    pub(crate) fn hash_key(key: &[u8]) -> String {
        let mut hasher = sha1::Sha1::new();

        hasher.update(key);
        hasher.update(WS_GUID.as_bytes());

        base64::encode(&hasher.digest().bytes())
    }

    #[cfg(test)]
    mod test {
        #![allow(unused_imports, unused_variables, dead_code)]
        use super::*;

        macro_rules! opcode_into {
            ($from:expr => $opcode:pat) => {
                match OpCode::from($from) {
                    e @ $opcode => (),
                    e => unreachable!("{:?}", e),
                }
            };
        }

        macro_rules! opcode_from {
            ($from:expr => $opcode:pat) => {
                let res: u8 = $from.into();
                match res {
                    e @ $opcode => (),
                    e => unreachable!("{:?}", e),
                }
            };
        }

        #[test]
        fn test_to_opcode() {
            opcode_into!(0 => OpCode::Continue);
            opcode_into!(1 => OpCode::Text);
            opcode_into!(2 => OpCode::Binary);
            opcode_into!(8 => OpCode::Close);
            opcode_into!(9 => OpCode::Ping);
            opcode_into!(10 => OpCode::Pong);
            opcode_into!(99 => OpCode::Bad);
        }

        #[test]
        fn test_from_opcode() {
            opcode_from!(OpCode::Continue => 0);
            opcode_from!(OpCode::Text => 1);
            opcode_from!(OpCode::Binary => 2);
            opcode_from!(OpCode::Close => 8);
            opcode_from!(OpCode::Ping => 9);
            opcode_from!(OpCode::Pong => 10);
        }

        #[test]
        #[should_panic]
        fn test_from_opcode_debug() {
            opcode_from!(OpCode::Bad => 99);
        }

        #[test]
        fn test_from_opcode_display() {
            assert_eq!(format!("{}", OpCode::Continue), "CONTINUE");
            assert_eq!(format!("{}", OpCode::Text), "TEXT");
            assert_eq!(format!("{}", OpCode::Binary), "BINARY");
            assert_eq!(format!("{}", OpCode::Close), "CLOSE");
            assert_eq!(format!("{}", OpCode::Ping), "PING");
            assert_eq!(format!("{}", OpCode::Pong), "PONG");
            assert_eq!(format!("{}", OpCode::Bad), "BAD");
        }

        #[test]
        fn closecode_from_u16() {
            assert_eq!(CloseCode::from(1000u16), CloseCode::Normal);
            assert_eq!(CloseCode::from(1001u16), CloseCode::Away);
            assert_eq!(CloseCode::from(1002u16), CloseCode::Protocol);
            assert_eq!(CloseCode::from(1003u16), CloseCode::Unsupported);
            assert_eq!(CloseCode::from(1006u16), CloseCode::Abnormal);
            assert_eq!(CloseCode::from(1007u16), CloseCode::Invalid);
            assert_eq!(CloseCode::from(1008u16), CloseCode::Policy);
            assert_eq!(CloseCode::from(1009u16), CloseCode::Size);
            assert_eq!(CloseCode::from(1010u16), CloseCode::Extension);
            assert_eq!(CloseCode::from(1011u16), CloseCode::Error);
            assert_eq!(CloseCode::from(1012u16), CloseCode::Restart);
            assert_eq!(CloseCode::from(1013u16), CloseCode::Again);
            assert_eq!(CloseCode::from(1015u16), CloseCode::Tls);
            assert_eq!(CloseCode::from(2000u16), CloseCode::Other(2000));
        }

        #[test]
        fn closecode_into_u16() {
            assert_eq!(1000u16, Into::<u16>::into(CloseCode::Normal));
            assert_eq!(1001u16, Into::<u16>::into(CloseCode::Away));
            assert_eq!(1002u16, Into::<u16>::into(CloseCode::Protocol));
            assert_eq!(1003u16, Into::<u16>::into(CloseCode::Unsupported));
            assert_eq!(1006u16, Into::<u16>::into(CloseCode::Abnormal));
            assert_eq!(1007u16, Into::<u16>::into(CloseCode::Invalid));
            assert_eq!(1008u16, Into::<u16>::into(CloseCode::Policy));
            assert_eq!(1009u16, Into::<u16>::into(CloseCode::Size));
            assert_eq!(1010u16, Into::<u16>::into(CloseCode::Extension));
            assert_eq!(1011u16, Into::<u16>::into(CloseCode::Error));
            assert_eq!(1012u16, Into::<u16>::into(CloseCode::Restart));
            assert_eq!(1013u16, Into::<u16>::into(CloseCode::Again));
            assert_eq!(1015u16, Into::<u16>::into(CloseCode::Tls));
            assert_eq!(2000u16, Into::<u16>::into(CloseCode::Other(2000)));
        }
    }

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