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use std::io;
use std::fmt;
use std::convert::From;

use httparse;

/// HTTP server error
pub struct Error(ErrorEnum);


quick_error! {
    #[derive(Debug)]
    pub enum ErrorEnum {
        /// Socket IO error
        Io(err: io::Error) {
            description("I/O error")
            display("I/O error: {}", err)
            from()
        }
        /// Error parsing http headers
        ParseError(err: httparse::Error) {
            description("parse error")
            display("parse error: {:?}", err)
            from()
        }
        /// Error parsing http chunk
        ChunkParseError(err: httparse::InvalidChunkSize) {
            description("chunk size parse error")
            from()
        }
        /// Connection reset
        ConnectionReset {
            description("connection reset")
        }
        /// Bad request target (middle line of the request line)
        BadRequestTarget {
            description("error parsing request target")
        }
        /// Host header is invalid (non-utf-8 for example)
        HostInvalid {
            description("invalid host header")
        }
        /// Duplicate host header in request
        DuplicateHost {
            description("duplicate host header")
        }
        /// Connection header is invalid (non-utf-8 for example)
        ConnectionInvalid {
            description("invalid connection header")
        }
        /// Content length header is invalid (non-integer, or > 64bit)
        ContentLengthInvalid {
            description("invalid content-length header")
        }
        /// Duplicate content-length header, this is prohibited due to security
        DuplicateContentLength {
            description("duplicate content length header")
        }
        /// Unsupported kind of request body
        ///
        /// We allow CONNECT requests in the library but drop them if you
        /// don't `Hijack` connection right after headers.
        UnsupportedBody {
            description("this kind of request body is not supported (CONNECT)")
        }
        /// Request body is larger than x in `RecvMode::Buffered(x)` or >64bit
        RequestTooLong {
            description("request body is too big")
        }
        Timeout {
            description("timeout while reading or writing request")
        }
        Custom(err: Box<::std::error::Error + Send + Sync>) {
            description("custom error")
            cause(&**err)
        }
    }
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Display::fmt(&self.0, f)
    }
}

impl fmt::Debug for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        fmt::Debug::fmt(&self.0, f)
    }
}

impl From<ErrorEnum> for Error {
    fn from(err: ErrorEnum) -> Self {
        Error(err)
    }
}

impl ::std::error::Error for Error {
    fn description(&self) -> &str {
        self.0.description()
    }
    fn cause(&self) -> Option<&::std::error::Error> {
        self.0.cause()
    }
}

impl Error {
    /// Create an error instance wrapping custom error
    pub fn custom<E: Into<Box<::std::error::Error + Send + Sync>>>(err: E)
        -> Error
    {
        Error(ErrorEnum::Custom(err.into()))
    }
}

#[test]
fn send_sync() {
    fn send_sync<T: Send+Sync>(_: T) {}
    send_sync(Error::from(ErrorEnum::Timeout));
}